static int sqliteCompileHandlers(Parse *pParse, Block *pBlock, StmtList *pExList){
Vdbe *v = sqliteGetVdbe(pParse);
int i, n = pExList->nStmt, skiphalt = 0;
for(i=0; i<n; i++){
Stmt *pEWhen = pExList->a[i].pStmt;
Expr *pExpr = pEWhen->pExpr1;
int lbl1, lbl2;
assert( pEWhen->op==TK_WHEN );
if( pExpr ) {
lbl2 = sqliteVdbeMakeLabel(v);
while( pExpr && pExpr->op==TK_OR ) {
sqliteOneHandler( pExpr->pRight, lbl2, 1, v );
pExpr = pExpr->pLeft;
}
lbl1 = sqliteVdbeMakeLabel(v);
sqliteOneHandler( pExpr, lbl1, 0, v );
sqliteVdbeResolveLabel(v, lbl2);
} else {
lbl1 = sqliteVdbeMakeLabel(v);
sqliteVdbeOp3(v, OP_ExcepWhen, 0, lbl1, 0, P3_STATIC);
}
if( sqliteCompileList(pParse, pBlock, pEWhen->pStmt1, &skiphalt, 1) ){
return 1;
}
if( !skiphalt ) {
sqliteVdbeAddOp(v, OP_Goto, 0, pBlock->nExit);
}
sqliteVdbeResolveLabel(v, lbl1);
}
/* if no handler caught the exception, reraise it */
sqliteVdbeOp3(v, OP_Raise, 0, 0, 0, P3_STATIC);
return 0;
}
static int sqliteCompileBlock(Parse *pParse, Block *b){
Vdbe *v = sqliteGetVdbe(pParse);
Block *saveCurBlock;
int i, handler = 0;
saveCurBlock = pParse->pCurrentBlock;
pParse->pCurrentBlock = b;
DbSetProperty(pParse->db, 0, DB_Cookie);
b->nExit = sqliteVdbeMakeLabel(v);
if( b->pExList ) {
handler = sqliteVdbeMakeLabel(v);
sqliteVdbeAddOp(v, OP_NewHandler, 0, handler);
}
for(i=0; i<b->nVar; i++) {
if( b->aVar[i].pDflt!=0 ) {
Expr *pExpr = b->aVar[i].pDflt;
if( sqliteExprProcResolve(pParse, b, pExpr) ){
return 1;
}
if( sqliteExprCheck(pParse, pExpr, 0, 0) ){
return 1;
}
sqliteExprCode(pParse, pExpr);
sqliteVdbeAddOp(v, OP_MemStore, b->aVar[i].mVar , 1);
}
}
if( sqliteCompileList(pParse, b, b->pStList, 0, 0) ){
return 1;
}
if( b->pExList ) {
sqliteVdbeAddOp(v, OP_Goto, 0, b->nExit);
sqliteVdbeResolveLabel(v, handler);
if( sqliteCompileHandlers(pParse, b, b->pExList) ){
return 1;
}
}
sqliteVdbeResolveLabel(v, b->nExit);
if( b->pExList && b->pParent!=0 ) {
sqliteVdbeAddOp(v, OP_PrevHandler, 0, 0);
}
/* if we end with 'goto next' (last stmt is a return), remove it */
// if( v->aOp[v->nOp-1].opcode==OP_Goto && v->aOp[v->nOp-1].p2==v->nOp ) {
// v->nOp--;
// }
pParse->pCurrentBlock = saveCurBlock;
return 0;
}
int sqliteCompileSQLStmt(Parse *pParse, Block *b, SQLStmt* pSql){
Vdbe *v = sqliteGetVdbe(pParse);
int i,j;
switch( pSql->op ){
case TK_SELECT: {
assert(pSql->pSelect);
assert(pSql->pSelect->pSrc);
sqliteSelect(pParse, pSql->pSelect, SRT_Stack, 0, 0, 0, 0);
if( pSql->pExprList->nExpr!=pSql->pSelect->pEList->nExpr ) {
sqliteErrorMsg(pParse, "INTO list does not match column list", 0);
return 1;
}
for(i=0; i<pSql->pExprList->nExpr; i++) {
Expr *e = pSql->pExprList->a[i].pExpr;
if( e->op!=TK_ID ) {
sqliteErrorMsg(pParse, "Bad lvalue in INTO list", 0);
return 1;
}
if( sqliteExprProcResolve(pParse, b, e) ){
return 1;
}
assert( e->op==TK_VAR );
if( e->flags==EP_NotNull ){
j = sqliteVdbeMakeLabel(v);
sqliteVdbeAddOp(v, OP_NotNull, -1, i);
sqliteVdbeOp3(v, OP_Halt, SQLITE_CONSTRAINT, OE_Abort,
"attempt to store null in non-null var", P3_STATIC);
sqliteVdbeResolveLabel(v, j);
}
sqliteVdbeAddOp(v, OP_MemStore, e->iColumn, 1);
}
break;
}
case TK_UPDATE: {
SrcList *pSrc;
pSrc = sqliteSrcListAppend(0, &pSql->target, 0);
sqliteUpdate(pParse, pSrc, pSql->pExprList, pSql->pWhere, pSql->orconf);
break;
}
case TK_INSERT: {
SrcList *pSrc;
pSrc = sqliteSrcListAppend(0, &pSql->target, 0);
sqliteInsert(pParse, pSrc, pSql->pExprList, pSql->pSelect, pSql->pIdList, pSql->orconf);
break;
}
case TK_DELETE: {
SrcList *pSrc;
pSrc = sqliteSrcListAppend(0, &pSql->target, 0);
sqliteDeleteFrom(pParse, pSrc, pSql->pWhere);
break;
}
default:
assert(0);
}
return 0;
}
/*
** Process a DELETE FROM statement.
*/
void sqliteDeleteFrom(
Parse *pParse, /* The parser context */
SrcList *pTabList, /* The table from which we should delete things */
Expr *pWhere /* The WHERE clause. May be null */
){
Vdbe *v; /* The virtual database engine */
Table *pTab; /* The table from which records will be deleted */
const char *zDb; /* Name of database holding pTab */
int end, addr; /* A couple addresses of generated code */
int i; /* Loop counter */
WhereInfo *pWInfo; /* Information about the WHERE clause */
Index *pIdx; /* For looping over indices of the table */
int iCur; /* VDBE Cursor number for pTab */
sqlite *db; /* Main database structure */
int isView; /* True if attempting to delete from a view */
AuthContext sContext; /* Authorization context */
int row_triggers_exist = 0; /* True if any triggers exist */
int before_triggers; /* True if there are BEFORE triggers */
int after_triggers; /* True if there are AFTER triggers */
int oldIdx = -1; /* Cursor for the OLD table of AFTER triggers */
sContext.pParse = 0;
if( pParse->nErr || sqlite_malloc_failed ){
pTabList = 0;
goto delete_from_cleanup;
}
db = pParse->db;
assert( pTabList->nSrc==1 );
/* Locate the table which we want to delete. This table has to be
** put in an SrcList structure because some of the subroutines we
** will be calling are designed to work with multiple tables and expect
** an SrcList* parameter instead of just a Table* parameter.
*/
pTab = sqliteSrcListLookup(pParse, pTabList);
if( pTab==0 ) goto delete_from_cleanup;
before_triggers = sqliteTriggersExist(pParse, pTab->pTrigger,
TK_DELETE, TK_BEFORE, TK_ROW, 0);
after_triggers = sqliteTriggersExist(pParse, pTab->pTrigger,
TK_DELETE, TK_AFTER, TK_ROW, 0);
row_triggers_exist = before_triggers || after_triggers;
isView = pTab->pSelect!=0;
if( sqliteIsReadOnly(pParse, pTab, before_triggers) ){
goto delete_from_cleanup;
}
assert( pTab->iDb<db->nDb );
zDb = db->aDb[pTab->iDb].zName;
if( sqliteAuthCheck(pParse, SQLITE_DELETE, pTab->zName, 0, zDb) ){
goto delete_from_cleanup;
}
/* If pTab is really a view, make sure it has been initialized.
*/
if( isView && sqliteViewGetColumnNames(pParse, pTab) ){
goto delete_from_cleanup;
}
/* Allocate a cursor used to store the old.* data for a trigger.
*/
if( row_triggers_exist ){
oldIdx = pParse->nTab++;
}
/* Resolve the column names in all the expressions.
*/
assert( pTabList->nSrc==1 );
iCur = pTabList->a[0].iCursor = pParse->nTab++;
if( pWhere ){
if( sqliteExprResolveIds(pParse, pTabList, 0, pWhere) ){
goto delete_from_cleanup;
}
if( sqliteExprCheck(pParse, pWhere, 0, 0) ){
goto delete_from_cleanup;
}
}
/* Start the view context
*/
if( isView ){
sqliteAuthContextPush(pParse, &sContext, pTab->zName);
}
/* Begin generating code.
*/
v = sqliteGetVdbe(pParse);
if( v==0 ){
goto delete_from_cleanup;
}
sqliteBeginWriteOperation(pParse, row_triggers_exist, pTab->iDb);
/* If we are trying to delete from a view, construct that view into
** a temporary table.
*/
if( isView ){
Select *pView = sqliteSelectDup(pTab->pSelect);
sqliteSelect(pParse, pView, SRT_TempTable, iCur, 0, 0, 0);
sqliteSelectDelete(pView);
}
/* Initialize the counter of the number of rows deleted, if
** we are counting rows.
*/
if( db->flags & SQLITE_CountRows ){
sqliteVdbeAddOp(v, OP_Integer, 0, 0);
}
/* Special case: A DELETE without a WHERE clause deletes everything.
** It is easier just to erase the whole table. Note, however, that
** this means that the row change count will be incorrect.
*/
if( pWhere==0 && !row_triggers_exist ){
if( db->flags & SQLITE_CountRows ){
/* If counting rows deleted, just count the total number of
** entries in the table. */
int endOfLoop = sqliteVdbeMakeLabel(v);
int addr;
if( !isView ){
sqliteVdbeAddOp(v, OP_Integer, pTab->iDb, 0);
sqliteVdbeAddOp(v, OP_OpenRead, iCur, pTab->tnum);
}
sqliteVdbeAddOp(v, OP_Rewind, iCur, sqliteVdbeCurrentAddr(v)+2);
addr = sqliteVdbeAddOp(v, OP_AddImm, 1, 0);
sqliteVdbeAddOp(v, OP_Next, iCur, addr);
sqliteVdbeResolveLabel(v, endOfLoop);
sqliteVdbeAddOp(v, OP_Close, iCur, 0);
}
if( !isView ){
sqliteVdbeAddOp(v, OP_Clear, pTab->tnum, pTab->iDb);
for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
sqliteVdbeAddOp(v, OP_Clear, pIdx->tnum, pIdx->iDb);
}
}
}
/* The usual case: There is a WHERE clause so we have to scan through
** the table and pick which records to delete.
*/
else{
/* Begin the database scan
*/
pWInfo = sqliteWhereBegin(pParse, pTabList, pWhere, 1, 0);
if( pWInfo==0 ) goto delete_from_cleanup;
/* Remember the key of every item to be deleted.
*/
sqliteVdbeAddOp(v, OP_ListWrite, 0, 0);
if( db->flags & SQLITE_CountRows ){
sqliteVdbeAddOp(v, OP_AddImm, 1, 0);
}
/* End the database scan loop.
*/
sqliteWhereEnd(pWInfo);
/* Open the pseudo-table used to store OLD if there are triggers.
*/
if( row_triggers_exist ){
sqliteVdbeAddOp(v, OP_OpenPseudo, oldIdx, 0);
}
/* Delete every item whose key was written to the list during the
** database scan. We have to delete items after the scan is complete
** because deleting an item can change the scan order.
*/
sqliteVdbeAddOp(v, OP_ListRewind, 0, 0);
end = sqliteVdbeMakeLabel(v);
/* This is the beginning of the delete loop when there are
** row triggers.
*/
if( row_triggers_exist ){
addr = sqliteVdbeAddOp(v, OP_ListRead, 0, end);
sqliteVdbeAddOp(v, OP_Dup, 0, 0);
if( !isView ){
sqliteVdbeAddOp(v, OP_Integer, pTab->iDb, 0);
sqliteVdbeAddOp(v, OP_OpenRead, iCur, pTab->tnum);
}
sqliteVdbeAddOp(v, OP_MoveTo, iCur, 0);
sqliteVdbeAddOp(v, OP_Recno, iCur, 0);
sqliteVdbeAddOp(v, OP_RowData, iCur, 0);
sqliteVdbeAddOp(v, OP_PutIntKey, oldIdx, 0);
if( !isView ){
sqliteVdbeAddOp(v, OP_Close, iCur, 0);
}
sqliteCodeRowTrigger(pParse, TK_DELETE, 0, TK_BEFORE, pTab, -1,
oldIdx, (pParse->trigStack)?pParse->trigStack->orconf:OE_Default,
addr);
}
if( !isView ){
/* Open cursors for the table we are deleting from and all its
** indices. If there are row triggers, this happens inside the
** OP_ListRead loop because the cursor have to all be closed
** before the trigger fires. If there are no row triggers, the
** cursors are opened only once on the outside the loop.
*/
pParse->nTab = iCur + 1;
sqliteOpenTableAndIndices(pParse, pTab, iCur);
/* This is the beginning of the delete loop when there are no
** row triggers */
if( !row_triggers_exist ){
addr = sqliteVdbeAddOp(v, OP_ListRead, 0, end);
}
/* Delete the row */
sqliteGenerateRowDelete(db, v, pTab, iCur, pParse->trigStack==0);
}
/* If there are row triggers, close all cursors then invoke
** the AFTER triggers
*/
if( row_triggers_exist ){
if( !isView ){
for(i=1, pIdx=pTab->pIndex; pIdx; i++, pIdx=pIdx->pNext){
sqliteVdbeAddOp(v, OP_Close, iCur + i, pIdx->tnum);
}
sqliteVdbeAddOp(v, OP_Close, iCur, 0);
}
sqliteCodeRowTrigger(pParse, TK_DELETE, 0, TK_AFTER, pTab, -1,
oldIdx, (pParse->trigStack)?pParse->trigStack->orconf:OE_Default,
addr);
}
/* End of the delete loop */
sqliteVdbeAddOp(v, OP_Goto, 0, addr);
sqliteVdbeResolveLabel(v, end);
sqliteVdbeAddOp(v, OP_ListReset, 0, 0);
/* Close the cursors after the loop if there are no row triggers */
if( !row_triggers_exist ){
for(i=1, pIdx=pTab->pIndex; pIdx; i++, pIdx=pIdx->pNext){
sqliteVdbeAddOp(v, OP_Close, iCur + i, pIdx->tnum);
}
sqliteVdbeAddOp(v, OP_Close, iCur, 0);
pParse->nTab = iCur;
}
}
sqliteVdbeAddOp(v, OP_SetCounts, 0, 0);
sqliteEndWriteOperation(pParse);
/*
** Return the number of rows that were deleted.
*/
if( db->flags & SQLITE_CountRows ){
sqliteVdbeAddOp(v, OP_ColumnName, 0, 1);
sqliteVdbeChangeP3(v, -1, "rows deleted", P3_STATIC);
sqliteVdbeAddOp(v, OP_Callback, 1, 0);
}
delete_from_cleanup:
sqliteAuthContextPop(&sContext);
sqliteSrcListDelete(pTabList);
sqliteExprDelete(pWhere);
return;
}
/*
** Generate the beginning of the loop used for WHERE clause processing.
** The return value is a pointer to an (opaque) structure that contains
** information needed to terminate the loop. Later, the calling routine
** should invoke sqliteWhereEnd() with the return value of this function
** in order to complete the WHERE clause processing.
**
** If an error occurs, this routine returns NULL.
**
** The basic idea is to do a nested loop, one loop for each table in
** the FROM clause of a select. (INSERT and UPDATE statements are the
** same as a SELECT with only a single table in the FROM clause.) For
** example, if the SQL is this:
**
** SELECT * FROM t1, t2, t3 WHERE ...;
**
** Then the code generated is conceptually like the following:
**
** foreach row1 in t1 do \ Code generated
** foreach row2 in t2 do |-- by sqliteWhereBegin()
** foreach row3 in t3 do /
** ...
** end \ Code generated
** end |-- by sqliteWhereEnd()
** end /
**
** There are Btree cursors associated with each table. t1 uses cursor
** number pTabList->a[0].iCursor. t2 uses the cursor pTabList->a[1].iCursor.
** And so forth. This routine generates code to open those VDBE cursors
** and sqliteWhereEnd() generates the code to close them.
**
** If the WHERE clause is empty, the foreach loops must each scan their
** entire tables. Thus a three-way join is an O(N^3) operation. But if
** the tables have indices and there are terms in the WHERE clause that
** refer to those indices, a complete table scan can be avoided and the
** code will run much faster. Most of the work of this routine is checking
** to see if there are indices that can be used to speed up the loop.
**
** Terms of the WHERE clause are also used to limit which rows actually
** make it to the "..." in the middle of the loop. After each "foreach",
** terms of the WHERE clause that use only terms in that loop and outer
** loops are evaluated and if false a jump is made around all subsequent
** inner loops (or around the "..." if the test occurs within the inner-
** most loop)
**
** OUTER JOINS
**
** An outer join of tables t1 and t2 is conceptally coded as follows:
**
** foreach row1 in t1 do
** flag = 0
** foreach row2 in t2 do
** start:
** ...
** flag = 1
** end
** if flag==0 then
** move the row2 cursor to a null row
** goto start
** fi
** end
**
** ORDER BY CLAUSE PROCESSING
**
** *ppOrderBy is a pointer to the ORDER BY clause of a SELECT statement,
** if there is one. If there is no ORDER BY clause or if this routine
** is called from an UPDATE or DELETE statement, then ppOrderBy is NULL.
**
** If an index can be used so that the natural output order of the table
** scan is correct for the ORDER BY clause, then that index is used and
** *ppOrderBy is set to NULL. This is an optimization that prevents an
** unnecessary sort of the result set if an index appropriate for the
** ORDER BY clause already exists.
**
** If the where clause loops cannot be arranged to provide the correct
** output order, then the *ppOrderBy is unchanged.
*/
WhereInfo *sqliteWhereBegin(
Parse *pParse, /* The parser context */
SrcList *pTabList, /* A list of all tables to be scanned */
Expr *pWhere, /* The WHERE clause */
int pushKey, /* If TRUE, leave the table key on the stack */
ExprList **ppOrderBy /* An ORDER BY clause, or NULL */
){
int i; /* Loop counter */
WhereInfo *pWInfo; /* Will become the return value of this function */
Vdbe *v = pParse->pVdbe; /* The virtual database engine */
int brk, cont = 0; /* Addresses used during code generation */
int nExpr; /* Number of subexpressions in the WHERE clause */
int loopMask; /* One bit set for each outer loop */
int haveKey; /* True if KEY is on the stack */
ExprMaskSet maskSet; /* The expression mask set */
int iDirectEq[32]; /* Term of the form ROWID==X for the N-th table */
int iDirectLt[32]; /* Term of the form ROWID<X or ROWID<=X */
int iDirectGt[32]; /* Term of the form ROWID>X or ROWID>=X */
ExprInfo aExpr[101]; /* The WHERE clause is divided into these expressions */
/* pushKey is only allowed if there is a single table (as in an INSERT or
** UPDATE statement)
*/
assert( pushKey==0 || pTabList->nSrc==1 );
/* Split the WHERE clause into separate subexpressions where each
** subexpression is separated by an AND operator. If the aExpr[]
** array fills up, the last entry might point to an expression which
** contains additional unfactored AND operators.
*/
initMaskSet(&maskSet);
memset(aExpr, 0, sizeof(aExpr));
nExpr = exprSplit(ARRAYSIZE(aExpr), aExpr, pWhere);
if( nExpr==ARRAYSIZE(aExpr) ){
sqliteErrorMsg(pParse, "WHERE clause too complex - no more "
"than %d terms allowed", (int)ARRAYSIZE(aExpr)-1);
return 0;
}
/* Allocate and initialize the WhereInfo structure that will become the
** return value.
*/
pWInfo = sqliteMalloc( sizeof(WhereInfo) + pTabList->nSrc*sizeof(WhereLevel));
if( sqlite_malloc_failed ){
sqliteFree(pWInfo);
return 0;
}
pWInfo->pParse = pParse;
pWInfo->pTabList = pTabList;
pWInfo->peakNTab = pWInfo->savedNTab = pParse->nTab;
pWInfo->iBreak = sqliteVdbeMakeLabel(v);
/* Special case: a WHERE clause that is constant. Evaluate the
** expression and either jump over all of the code or fall thru.
*/
if( pWhere && (pTabList->nSrc==0 || sqliteExprIsConstant(pWhere)) ){
sqliteExprIfFalse(pParse, pWhere, pWInfo->iBreak, 1);
pWhere = 0;
}
/* Analyze all of the subexpressions.
*/
for(i=0; i<nExpr; i++){
exprAnalyze(&maskSet, &aExpr[i]);
/* If we are executing a trigger body, remove all references to
** new.* and old.* tables from the prerequisite masks.
*/
if( pParse->trigStack ){
int x;
if( (x = pParse->trigStack->newIdx) >= 0 ){
int mask = ~getMask(&maskSet, x);
aExpr[i].prereqRight &= mask;
aExpr[i].prereqLeft &= mask;
aExpr[i].prereqAll &= mask;
}
if( (x = pParse->trigStack->oldIdx) >= 0 ){
int mask = ~getMask(&maskSet, x);
aExpr[i].prereqRight &= mask;
aExpr[i].prereqLeft &= mask;
aExpr[i].prereqAll &= mask;
}
}
}
/* Figure out what index to use (if any) for each nested loop.
** Make pWInfo->a[i].pIdx point to the index to use for the i-th nested
** loop where i==0 is the outer loop and i==pTabList->nSrc-1 is the inner
** loop.
**
** If terms exist that use the ROWID of any table, then set the
** iDirectEq[], iDirectLt[], or iDirectGt[] elements for that table
** to the index of the term containing the ROWID. We always prefer
** to use a ROWID which can directly access a table rather than an
** index which requires reading an index first to get the rowid then
** doing a second read of the actual database table.
**
** Actually, if there are more than 32 tables in the join, only the
** first 32 tables are candidates for indices. This is (again) due
** to the limit of 32 bits in an integer bitmask.
*/
loopMask = 0;
for(i=0; i<pTabList->nSrc && i<ARRAYSIZE(iDirectEq); i++){
int j;
int iCur = pTabList->a[i].iCursor; /* The cursor for this table */
int mask = getMask(&maskSet, iCur); /* Cursor mask for this table */
Table *pTab = pTabList->a[i].pTab;
Index *pIdx;
Index *pBestIdx = 0;
int bestScore = 0;
/* Check to see if there is an expression that uses only the
** ROWID field of this table. For terms of the form ROWID==expr
** set iDirectEq[i] to the index of the term. For terms of the
** form ROWID<expr or ROWID<=expr set iDirectLt[i] to the term index.
** For terms like ROWID>expr or ROWID>=expr set iDirectGt[i].
**
** (Added:) Treat ROWID IN expr like ROWID=expr.
*/
pWInfo->a[i].iCur = -1;
iDirectEq[i] = -1;
iDirectLt[i] = -1;
iDirectGt[i] = -1;
for(j=0; j<nExpr; j++){
if( aExpr[j].idxLeft==iCur && aExpr[j].p->pLeft->iColumn<0
&& (aExpr[j].prereqRight & loopMask)==aExpr[j].prereqRight ){
switch( aExpr[j].p->op ){
case TK_IN:
case TK_EQ: iDirectEq[i] = j; break;
case TK_LE:
case TK_LT: iDirectLt[i] = j; break;
case TK_GE:
case TK_GT: iDirectGt[i] = j; break;
}
}
if( aExpr[j].idxRight==iCur && aExpr[j].p->pRight->iColumn<0
&& (aExpr[j].prereqLeft & loopMask)==aExpr[j].prereqLeft ){
switch( aExpr[j].p->op ){
case TK_EQ: iDirectEq[i] = j; break;
case TK_LE:
case TK_LT: iDirectGt[i] = j; break;
case TK_GE:
case TK_GT: iDirectLt[i] = j; break;
}
}
}
if( iDirectEq[i]>=0 ){
loopMask |= mask;
pWInfo->a[i].pIdx = 0;
continue;
}
/* Do a search for usable indices. Leave pBestIdx pointing to
** the "best" index. pBestIdx is left set to NULL if no indices
** are usable.
**
** The best index is determined as follows. For each of the
** left-most terms that is fixed by an equality operator, add
** 8 to the score. The right-most term of the index may be
** constrained by an inequality. Add 1 if for an "x<..." constraint
** and add 2 for an "x>..." constraint. Chose the index that
** gives the best score.
**
** This scoring system is designed so that the score can later be
** used to determine how the index is used. If the score&7 is 0
** then all constraints are equalities. If score&1 is not 0 then
** there is an inequality used as a termination key. (ex: "x<...")
** If score&2 is not 0 then there is an inequality used as the
** start key. (ex: "x>..."). A score or 4 is the special case
** of an IN operator constraint. (ex: "x IN ...").
**
** The IN operator (as in "<expr> IN (...)") is treated the same as
** an equality comparison except that it can only be used on the
** left-most column of an index and other terms of the WHERE clause
** cannot be used in conjunction with the IN operator to help satisfy
** other columns of the index.
*/
for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
int eqMask = 0; /* Index columns covered by an x=... term */
int ltMask = 0; /* Index columns covered by an x<... term */
int gtMask = 0; /* Index columns covered by an x>... term */
int inMask = 0; /* Index columns covered by an x IN .. term */
int nEq, m, score;
if( pIdx->nColumn>32 ) continue; /* Ignore indices too many columns */
for(j=0; j<nExpr; j++){
if( aExpr[j].idxLeft==iCur
&& (aExpr[j].prereqRight & loopMask)==aExpr[j].prereqRight ){
int iColumn = aExpr[j].p->pLeft->iColumn;
int k;
for(k=0; k<pIdx->nColumn; k++){
if( pIdx->aiColumn[k]==iColumn ){
switch( aExpr[j].p->op ){
case TK_IN: {
if( k==0 ) inMask |= 1;
break;
}
case TK_EQ: {
eqMask |= 1<<k;
break;
}
case TK_LE:
case TK_LT: {
ltMask |= 1<<k;
break;
}
case TK_GE:
case TK_GT: {
gtMask |= 1<<k;
break;
}
default: {
/* CANT_HAPPEN */
assert( 0 );
break;
}
}
break;
}
}
}
if( aExpr[j].idxRight==iCur
&& (aExpr[j].prereqLeft & loopMask)==aExpr[j].prereqLeft ){
int iColumn = aExpr[j].p->pRight->iColumn;
int k;
for(k=0; k<pIdx->nColumn; k++){
if( pIdx->aiColumn[k]==iColumn ){
switch( aExpr[j].p->op ){
case TK_EQ: {
eqMask |= 1<<k;
break;
}
case TK_LE:
case TK_LT: {
gtMask |= 1<<k;
break;
}
case TK_GE:
case TK_GT: {
ltMask |= 1<<k;
break;
}
default: {
/* CANT_HAPPEN */
assert( 0 );
break;
}
}
break;
}
}
}
}
/* The following loop ends with nEq set to the number of columns
** on the left of the index with == constraints.
*/
for(nEq=0; nEq<pIdx->nColumn; nEq++){
m = (1<<(nEq+1))-1;
if( (m & eqMask)!=m ) break;
}
score = nEq*8; /* Base score is 8 times number of == constraints */
m = 1<<nEq;
if( m & ltMask ) score++; /* Increase score for a < constraint */
if( m & gtMask ) score+=2; /* Increase score for a > constraint */
if( score==0 && inMask ) score = 4; /* Default score for IN constraint */
if( score>bestScore ){
pBestIdx = pIdx;
bestScore = score;
}
}
pWInfo->a[i].pIdx = pBestIdx;
pWInfo->a[i].score = bestScore;
pWInfo->a[i].bRev = 0;
loopMask |= mask;
if( pBestIdx ){
pWInfo->a[i].iCur = pParse->nTab++;
pWInfo->peakNTab = pParse->nTab;
}
}
/* Check to see if the ORDER BY clause is or can be satisfied by the
** use of an index on the first table.
*/
if( ppOrderBy && *ppOrderBy && pTabList->nSrc>0 ){
Index *pSortIdx;
Index *pIdx;
Table *pTab;
int bRev = 0;
pTab = pTabList->a[0].pTab;
pIdx = pWInfo->a[0].pIdx;
if( pIdx && pWInfo->a[0].score==4 ){
/* If there is already an IN index on the left-most table,
** it will not give the correct sort order.
** So, pretend that no suitable index is found.
*/
pSortIdx = 0;
}else if( iDirectEq[0]>=0 || iDirectLt[0]>=0 || iDirectGt[0]>=0 ){
/* If the left-most column is accessed using its ROWID, then do
** not try to sort by index.
*/
pSortIdx = 0;
}else{
int nEqCol = (pWInfo->a[0].score+4)/8;
pSortIdx = findSortingIndex(pTab, pTabList->a[0].iCursor,
*ppOrderBy, pIdx, nEqCol, &bRev);
}
if( pSortIdx && (pIdx==0 || pIdx==pSortIdx) ){
if( pIdx==0 ){
pWInfo->a[0].pIdx = pSortIdx;
pWInfo->a[0].iCur = pParse->nTab++;
pWInfo->peakNTab = pParse->nTab;
}
pWInfo->a[0].bRev = bRev;
*ppOrderBy = 0;
}
}
/* Open all tables in the pTabList and all indices used by those tables.
*/
for(i=0; i<pTabList->nSrc; i++){
Table *pTab;
Index *pIx;
pTab = pTabList->a[i].pTab;
if( pTab->isTransient || pTab->pSelect ) continue;
sqliteVdbeAddOp(v, OP_Integer, pTab->iDb, 0);
sqliteVdbeOp3(v, OP_OpenRead, pTabList->a[i].iCursor, pTab->tnum,
pTab->zName, P3_STATIC);
sqliteCodeVerifySchema(pParse, pTab->iDb);
if( (pIx = pWInfo->a[i].pIdx)!=0 ){
sqliteVdbeAddOp(v, OP_Integer, pIx->iDb, 0);
sqliteVdbeOp3(v, OP_OpenRead, pWInfo->a[i].iCur, pIx->tnum, pIx->zName,0);
}
}
/* Generate the code to do the search
*/
loopMask = 0;
for(i=0; i<pTabList->nSrc; i++){
int j, k;
int iCur = pTabList->a[i].iCursor;
Index *pIdx;
WhereLevel *pLevel = &pWInfo->a[i];
/* If this is the right table of a LEFT OUTER JOIN, allocate and
** initialize a memory cell that records if this table matches any
** row of the left table of the join.
*/
if( i>0 && (pTabList->a[i-1].jointype & JT_LEFT)!=0 ){
if( !pParse->nMem ) pParse->nMem++;
pLevel->iLeftJoin = pParse->nMem++;
sqliteVdbeAddOp(v, OP_String, 0, 0);
sqliteVdbeAddOp(v, OP_MemStore, pLevel->iLeftJoin, 1);
}
pIdx = pLevel->pIdx;
pLevel->inOp = OP_Noop;
if( i<ARRAYSIZE(iDirectEq) && iDirectEq[i]>=0 ){
/* Case 1: We can directly reference a single row using an
** equality comparison against the ROWID field. Or
** we reference multiple rows using a "rowid IN (...)"
** construct.
*/
k = iDirectEq[i];
assert( k<nExpr );
assert( aExpr[k].p!=0 );
assert( aExpr[k].idxLeft==iCur || aExpr[k].idxRight==iCur );
brk = pLevel->brk = sqliteVdbeMakeLabel(v);
if( aExpr[k].idxLeft==iCur ){
Expr *pX = aExpr[k].p;
if( pX->op!=TK_IN ){
sqliteExprCode(pParse, aExpr[k].p->pRight);
}else if( pX->pList ){
sqliteVdbeAddOp(v, OP_SetFirst, pX->iTable, brk);
pLevel->inOp = OP_SetNext;
pLevel->inP1 = pX->iTable;
pLevel->inP2 = sqliteVdbeCurrentAddr(v);
}else{
assert( pX->pSelect );
sqliteVdbeAddOp(v, OP_Rewind, pX->iTable, brk);
sqliteVdbeAddOp(v, OP_KeyAsData, pX->iTable, 1);
pLevel->inP2 = sqliteVdbeAddOp(v, OP_FullKey, pX->iTable, 0);
pLevel->inOp = OP_Next;
pLevel->inP1 = pX->iTable;
}
}else{
sqliteExprCode(pParse, aExpr[k].p->pLeft);
}
disableTerm(pLevel, &aExpr[k].p);
cont = pLevel->cont = sqliteVdbeMakeLabel(v);
sqliteVdbeAddOp(v, OP_MustBeInt, 1, brk);
haveKey = 0;
sqliteVdbeAddOp(v, OP_NotExists, iCur, brk);
pLevel->op = OP_Noop;
}else if( pIdx!=0 && pLevel->score>0 && pLevel->score%4==0 ){
/* Case 2: There is an index and all terms of the WHERE clause that
** refer to the index use the "==" or "IN" operators.
*/
int start;
int testOp;
int nColumn = (pLevel->score+4)/8;
brk = pLevel->brk = sqliteVdbeMakeLabel(v);
for(j=0; j<nColumn; j++){
for(k=0; k<nExpr; k++){
Expr *pX = aExpr[k].p;
if( pX==0 ) continue;
if( aExpr[k].idxLeft==iCur
&& (aExpr[k].prereqRight & loopMask)==aExpr[k].prereqRight
&& pX->pLeft->iColumn==pIdx->aiColumn[j]
){
if( pX->op==TK_EQ ){
sqliteExprCode(pParse, pX->pRight);
disableTerm(pLevel, &aExpr[k].p);
break;
}
if( pX->op==TK_IN && nColumn==1 ){
if( pX->pList ){
sqliteVdbeAddOp(v, OP_SetFirst, pX->iTable, brk);
pLevel->inOp = OP_SetNext;
pLevel->inP1 = pX->iTable;
pLevel->inP2 = sqliteVdbeCurrentAddr(v);
}else{
assert( pX->pSelect );
sqliteVdbeAddOp(v, OP_Rewind, pX->iTable, brk);
sqliteVdbeAddOp(v, OP_KeyAsData, pX->iTable, 1);
pLevel->inP2 = sqliteVdbeAddOp(v, OP_FullKey, pX->iTable, 0);
pLevel->inOp = OP_Next;
pLevel->inP1 = pX->iTable;
}
disableTerm(pLevel, &aExpr[k].p);
break;
}
}
if( aExpr[k].idxRight==iCur
&& aExpr[k].p->op==TK_EQ
&& (aExpr[k].prereqLeft & loopMask)==aExpr[k].prereqLeft
&& aExpr[k].p->pRight->iColumn==pIdx->aiColumn[j]
){
sqliteExprCode(pParse, aExpr[k].p->pLeft);
disableTerm(pLevel, &aExpr[k].p);
break;
}
}
}
pLevel->iMem = pParse->nMem++;
cont = pLevel->cont = sqliteVdbeMakeLabel(v);
sqliteVdbeAddOp(v, OP_NotNull, -nColumn, sqliteVdbeCurrentAddr(v)+3);
sqliteVdbeAddOp(v, OP_Pop, nColumn, 0);
sqliteVdbeAddOp(v, OP_Goto, 0, brk);
sqliteVdbeAddOp(v, OP_MakeKey, nColumn, 0);
sqliteAddIdxKeyType(v, pIdx);
if( nColumn==pIdx->nColumn || pLevel->bRev ){
sqliteVdbeAddOp(v, OP_MemStore, pLevel->iMem, 0);
testOp = OP_IdxGT;
}else{
sqliteVdbeAddOp(v, OP_Dup, 0, 0);
sqliteVdbeAddOp(v, OP_IncrKey, 0, 0);
sqliteVdbeAddOp(v, OP_MemStore, pLevel->iMem, 1);
testOp = OP_IdxGE;
}
if( pLevel->bRev ){
/* Scan in reverse order */
sqliteVdbeAddOp(v, OP_IncrKey, 0, 0);
sqliteVdbeAddOp(v, OP_MoveLt, pLevel->iCur, brk);
start = sqliteVdbeAddOp(v, OP_MemLoad, pLevel->iMem, 0);
sqliteVdbeAddOp(v, OP_IdxLT, pLevel->iCur, brk);
pLevel->op = OP_Prev;
}else{
/* Scan in the forward order */
sqliteVdbeAddOp(v, OP_MoveTo, pLevel->iCur, brk);
start = sqliteVdbeAddOp(v, OP_MemLoad, pLevel->iMem, 0);
sqliteVdbeAddOp(v, testOp, pLevel->iCur, brk);
pLevel->op = OP_Next;
}
sqliteVdbeAddOp(v, OP_RowKey, pLevel->iCur, 0);
sqliteVdbeAddOp(v, OP_IdxIsNull, nColumn, cont);
sqliteVdbeAddOp(v, OP_IdxRecno, pLevel->iCur, 0);
if( i==pTabList->nSrc-1 && pushKey ){
haveKey = 1;
}else{
sqliteVdbeAddOp(v, OP_MoveTo, iCur, 0);
haveKey = 0;
}
pLevel->p1 = pLevel->iCur;
pLevel->p2 = start;
}else if( i<ARRAYSIZE(iDirectLt) && (iDirectLt[i]>=0 || iDirectGt[i]>=0) ){
/* Case 3: We have an inequality comparison against the ROWID field.
*/
int testOp = OP_Noop;
int start;
brk = pLevel->brk = sqliteVdbeMakeLabel(v);
cont = pLevel->cont = sqliteVdbeMakeLabel(v);
if( iDirectGt[i]>=0 ){
k = iDirectGt[i];
assert( k<nExpr );
assert( aExpr[k].p!=0 );
assert( aExpr[k].idxLeft==iCur || aExpr[k].idxRight==iCur );
if( aExpr[k].idxLeft==iCur ){
sqliteExprCode(pParse, aExpr[k].p->pRight);
}else{
sqliteExprCode(pParse, aExpr[k].p->pLeft);
}
sqliteVdbeAddOp(v, OP_ForceInt,
aExpr[k].p->op==TK_LT || aExpr[k].p->op==TK_GT, brk);
sqliteVdbeAddOp(v, OP_MoveTo, iCur, brk);
disableTerm(pLevel, &aExpr[k].p);
}else{
sqliteVdbeAddOp(v, OP_Rewind, iCur, brk);
}
if( iDirectLt[i]>=0 ){
k = iDirectLt[i];
assert( k<nExpr );
assert( aExpr[k].p!=0 );
assert( aExpr[k].idxLeft==iCur || aExpr[k].idxRight==iCur );
if( aExpr[k].idxLeft==iCur ){
sqliteExprCode(pParse, aExpr[k].p->pRight);
}else{
sqliteExprCode(pParse, aExpr[k].p->pLeft);
}
/* sqliteVdbeAddOp(v, OP_MustBeInt, 0, sqliteVdbeCurrentAddr(v)+1); */
pLevel->iMem = pParse->nMem++;
sqliteVdbeAddOp(v, OP_MemStore, pLevel->iMem, 1);
if( aExpr[k].p->op==TK_LT || aExpr[k].p->op==TK_GT ){
testOp = OP_Ge;
}else{
testOp = OP_Gt;
}
disableTerm(pLevel, &aExpr[k].p);
}
start = sqliteVdbeCurrentAddr(v);
pLevel->op = OP_Next;
pLevel->p1 = iCur;
pLevel->p2 = start;
if( testOp!=OP_Noop ){
sqliteVdbeAddOp(v, OP_Recno, iCur, 0);
sqliteVdbeAddOp(v, OP_MemLoad, pLevel->iMem, 0);
sqliteVdbeAddOp(v, testOp, 0, brk);
}
haveKey = 0;
}else if( pIdx==0 ){
/* Case 4: There is no usable index. We must do a complete
** scan of the entire database table.
*/
int start;
brk = pLevel->brk = sqliteVdbeMakeLabel(v);
cont = pLevel->cont = sqliteVdbeMakeLabel(v);
sqliteVdbeAddOp(v, OP_Rewind, iCur, brk);
start = sqliteVdbeCurrentAddr(v);
pLevel->op = OP_Next;
pLevel->p1 = iCur;
pLevel->p2 = start;
haveKey = 0;
}else{
/* Case 5: The WHERE clause term that refers to the right-most
** column of the index is an inequality. For example, if
** the index is on (x,y,z) and the WHERE clause is of the
** form "x=5 AND y<10" then this case is used. Only the
** right-most column can be an inequality - the rest must
** use the "==" operator.
**
** This case is also used when there are no WHERE clause
** constraints but an index is selected anyway, in order
** to force the output order to conform to an ORDER BY.
*/
int score = pLevel->score;
int nEqColumn = score/8;
int start;
int leFlag, geFlag;
int testOp;
/* Evaluate the equality constraints
*/
for(j=0; j<nEqColumn; j++){
for(k=0; k<nExpr; k++){
if( aExpr[k].p==0 ) continue;
if( aExpr[k].idxLeft==iCur
&& aExpr[k].p->op==TK_EQ
&& (aExpr[k].prereqRight & loopMask)==aExpr[k].prereqRight
&& aExpr[k].p->pLeft->iColumn==pIdx->aiColumn[j]
){
sqliteExprCode(pParse, aExpr[k].p->pRight);
disableTerm(pLevel, &aExpr[k].p);
break;
}
if( aExpr[k].idxRight==iCur
&& aExpr[k].p->op==TK_EQ
&& (aExpr[k].prereqLeft & loopMask)==aExpr[k].prereqLeft
&& aExpr[k].p->pRight->iColumn==pIdx->aiColumn[j]
){
sqliteExprCode(pParse, aExpr[k].p->pLeft);
disableTerm(pLevel, &aExpr[k].p);
break;
}
}
}
/* Duplicate the equality term values because they will all be
** used twice: once to make the termination key and once to make the
** start key.
*/
for(j=0; j<nEqColumn; j++){
sqliteVdbeAddOp(v, OP_Dup, nEqColumn-1, 0);
}
/* Labels for the beginning and end of the loop
*/
cont = pLevel->cont = sqliteVdbeMakeLabel(v);
brk = pLevel->brk = sqliteVdbeMakeLabel(v);
/* Generate the termination key. This is the key value that
** will end the search. There is no termination key if there
** are no equality terms and no "X<..." term.
**
** 2002-Dec-04: On a reverse-order scan, the so-called "termination"
** key computed here really ends up being the start key.
*/
if( (score & 1)!=0 ){
for(k=0; k<nExpr; k++){
Expr *pExpr = aExpr[k].p;
if( pExpr==0 ) continue;
if( aExpr[k].idxLeft==iCur
&& (pExpr->op==TK_LT || pExpr->op==TK_LE)
&& (aExpr[k].prereqRight & loopMask)==aExpr[k].prereqRight
&& pExpr->pLeft->iColumn==pIdx->aiColumn[j]
){
sqliteExprCode(pParse, pExpr->pRight);
leFlag = pExpr->op==TK_LE;
disableTerm(pLevel, &aExpr[k].p);
break;
}
if( aExpr[k].idxRight==iCur
&& (pExpr->op==TK_GT || pExpr->op==TK_GE)
&& (aExpr[k].prereqLeft & loopMask)==aExpr[k].prereqLeft
&& pExpr->pRight->iColumn==pIdx->aiColumn[j]
){
sqliteExprCode(pParse, pExpr->pLeft);
leFlag = pExpr->op==TK_GE;
disableTerm(pLevel, &aExpr[k].p);
break;
}
}
testOp = OP_IdxGE;
}else{
testOp = nEqColumn>0 ? OP_IdxGE : OP_Noop;
leFlag = 1;
}
if( testOp!=OP_Noop ){
int nCol = nEqColumn + (score & 1);
pLevel->iMem = pParse->nMem++;
sqliteVdbeAddOp(v, OP_NotNull, -nCol, sqliteVdbeCurrentAddr(v)+3);
sqliteVdbeAddOp(v, OP_Pop, nCol, 0);
sqliteVdbeAddOp(v, OP_Goto, 0, brk);
sqliteVdbeAddOp(v, OP_MakeKey, nCol, 0);
sqliteAddIdxKeyType(v, pIdx);
if( leFlag ){
sqliteVdbeAddOp(v, OP_IncrKey, 0, 0);
}
if( pLevel->bRev ){
sqliteVdbeAddOp(v, OP_MoveLt, pLevel->iCur, brk);
}else{
sqliteVdbeAddOp(v, OP_MemStore, pLevel->iMem, 1);
}
}else if( pLevel->bRev ){
sqliteVdbeAddOp(v, OP_Last, pLevel->iCur, brk);
}
/* Generate the start key. This is the key that defines the lower
** bound on the search. There is no start key if there are no
** equality terms and if there is no "X>..." term. In
** that case, generate a "Rewind" instruction in place of the
** start key search.
**
** 2002-Dec-04: In the case of a reverse-order search, the so-called
** "start" key really ends up being used as the termination key.
*/
if( (score & 2)!=0 ){
for(k=0; k<nExpr; k++){
Expr *pExpr = aExpr[k].p;
if( pExpr==0 ) continue;
if( aExpr[k].idxLeft==iCur
&& (pExpr->op==TK_GT || pExpr->op==TK_GE)
&& (aExpr[k].prereqRight & loopMask)==aExpr[k].prereqRight
&& pExpr->pLeft->iColumn==pIdx->aiColumn[j]
){
sqliteExprCode(pParse, pExpr->pRight);
geFlag = pExpr->op==TK_GE;
disableTerm(pLevel, &aExpr[k].p);
break;
}
if( aExpr[k].idxRight==iCur
&& (pExpr->op==TK_LT || pExpr->op==TK_LE)
&& (aExpr[k].prereqLeft & loopMask)==aExpr[k].prereqLeft
&& pExpr->pRight->iColumn==pIdx->aiColumn[j]
){
sqliteExprCode(pParse, pExpr->pLeft);
geFlag = pExpr->op==TK_LE;
disableTerm(pLevel, &aExpr[k].p);
break;
}
}
}else{
geFlag = 1;
}
if( nEqColumn>0 || (score&2)!=0 ){
int nCol = nEqColumn + ((score&2)!=0);
sqliteVdbeAddOp(v, OP_NotNull, -nCol, sqliteVdbeCurrentAddr(v)+3);
sqliteVdbeAddOp(v, OP_Pop, nCol, 0);
sqliteVdbeAddOp(v, OP_Goto, 0, brk);
sqliteVdbeAddOp(v, OP_MakeKey, nCol, 0);
sqliteAddIdxKeyType(v, pIdx);
if( !geFlag ){
sqliteVdbeAddOp(v, OP_IncrKey, 0, 0);
}
if( pLevel->bRev ){
pLevel->iMem = pParse->nMem++;
sqliteVdbeAddOp(v, OP_MemStore, pLevel->iMem, 1);
testOp = OP_IdxLT;
}else{
sqliteVdbeAddOp(v, OP_MoveTo, pLevel->iCur, brk);
}
}else if( pLevel->bRev ){
testOp = OP_Noop;
}else{
sqliteVdbeAddOp(v, OP_Rewind, pLevel->iCur, brk);
}
/* Generate the the top of the loop. If there is a termination
** key we have to test for that key and abort at the top of the
** loop.
*/
start = sqliteVdbeCurrentAddr(v);
if( testOp!=OP_Noop ){
sqliteVdbeAddOp(v, OP_MemLoad, pLevel->iMem, 0);
sqliteVdbeAddOp(v, testOp, pLevel->iCur, brk);
}
sqliteVdbeAddOp(v, OP_RowKey, pLevel->iCur, 0);
sqliteVdbeAddOp(v, OP_IdxIsNull, nEqColumn + (score & 1), cont);
sqliteVdbeAddOp(v, OP_IdxRecno, pLevel->iCur, 0);
if( i==pTabList->nSrc-1 && pushKey ){
haveKey = 1;
}else{
sqliteVdbeAddOp(v, OP_MoveTo, iCur, 0);
haveKey = 0;
}
/* Record the instruction used to terminate the loop.
*/
pLevel->op = pLevel->bRev ? OP_Prev : OP_Next;
pLevel->p1 = pLevel->iCur;
pLevel->p2 = start;
}
loopMask |= getMask(&maskSet, iCur);
/* Insert code to test every subexpression that can be completely
** computed using the current set of tables.
*/
for(j=0; j<nExpr; j++){
if( aExpr[j].p==0 ) continue;
if( (aExpr[j].prereqAll & loopMask)!=aExpr[j].prereqAll ) continue;
if( pLevel->iLeftJoin && !ExprHasProperty(aExpr[j].p,EP_FromJoin) ){
continue;
}
if( haveKey ){
haveKey = 0;
sqliteVdbeAddOp(v, OP_MoveTo, iCur, 0);
}
sqliteExprIfFalse(pParse, aExpr[j].p, cont, 1);
aExpr[j].p = 0;
}
brk = cont;
/* For a LEFT OUTER JOIN, generate code that will record the fact that
** at least one row of the right table has matched the left table.
*/
if( pLevel->iLeftJoin ){
pLevel->top = sqliteVdbeCurrentAddr(v);
sqliteVdbeAddOp(v, OP_Integer, 1, 0);
sqliteVdbeAddOp(v, OP_MemStore, pLevel->iLeftJoin, 1);
for(j=0; j<nExpr; j++){
if( aExpr[j].p==0 ) continue;
if( (aExpr[j].prereqAll & loopMask)!=aExpr[j].prereqAll ) continue;
if( haveKey ){
/* Cannot happen. "haveKey" can only be true if pushKey is true
** an pushKey can only be true for DELETE and UPDATE and there are
** no outer joins with DELETE and UPDATE.
*/
haveKey = 0;
sqliteVdbeAddOp(v, OP_MoveTo, iCur, 0);
}
sqliteExprIfFalse(pParse, aExpr[j].p, cont, 1);
aExpr[j].p = 0;
}
}
}
pWInfo->iContinue = cont;
if( pushKey && !haveKey ){
sqliteVdbeAddOp(v, OP_Recno, pTabList->a[0].iCursor, 0);
}
freeMaskSet(&maskSet);
return pWInfo;
}
static int sqliteCompileStmt(
Parse *pParse, /* parse context */
Block *b, /* current block */
Stmt* pStmt, /* statement to compile */
int *tailgoto, /* set *tailgoto to 1 if last statement is a goto */
int in_excep /* set to 1 when compiling an exception handler */
){
Vdbe *v = sqliteGetVdbe(pParse);
SrcList dummy;
int i, j, skipgoto = 0;
dummy.nSrc = 0;
if( tailgoto ) *tailgoto = 0;
if( pStmt->op!=TK_RAISE && pStmt->op!=TK_PROCEDURE && pStmt->pExpr1 ){
Expr *pExpr = pStmt->pExpr1;
if( pStmt->op==TK_FOR ) {
/* allocate the FOR counter variable (see case TK_FOR below) */
sqliteAddProcVar(pParse, &(pExpr->pLeft->token));
}
if( sqliteExprProcResolve(pParse, b, pExpr) ){
return 1;
}
if( sqliteExprCheck(pParse, pExpr, 0, 0) ){
return 1;
}
}
switch( pStmt->op ) {
case TK_ASSIGN:{
Expr *pLeft = pStmt->pExpr1->pLeft;
Expr *pRight = pStmt->pExpr1->pRight;
assert( pStmt->pExpr1->op==TK_ASSIGN );
assert( pLeft->op==TK_VAR );
sqliteExprCode(pParse, pRight);
if( pLeft->flags==EP_NotNull ){
i = sqliteVdbeMakeLabel(v);
sqliteVdbeAddOp(v, OP_NotNull, -1, i);
sqliteVdbeOp3(v, OP_Halt, SQLITE_CONSTRAINT, OE_Abort,
"attempt to store null in non-null var", P3_STATIC);
sqliteVdbeResolveLabel(v, i);
}
sqliteVdbeAddOp(v, OP_MemStore, pLeft->iColumn, 1);
break;
}
case TK_BLOCK:{
if( sqliteCompileBlock(pParse, pStmt->pBlock) ){
return 1;
}
break;
}
case TK_CASE:{
int jumpInst, addr;
int nStmt;
int searched;
nStmt = pStmt->pStmt1->nStmt;
searched = pStmt->pExpr1==0;
assert( nStmt>0 );
j = sqliteVdbeMakeLabel(v);
if( !searched ){
sqliteExprCode(pParse, pStmt->pExpr1);
}
for(i=0; i<nStmt; i++){
Stmt *pWhen = pStmt->pStmt1->a[i].pStmt;
assert( pWhen->op==TK_WHEN );
if( sqliteExprProcResolve(pParse, b, pWhen->pExpr1) ){
return 1;
}
if( sqliteExprCheck(pParse, pWhen->pExpr1, 0, 0) ){
return 1;
}
sqliteExprCode(pParse, pWhen->pExpr1);
if( !searched ){
sqliteVdbeAddOp(v, OP_Dup, 1, 1);
jumpInst = sqliteVdbeAddOp(v, OP_Ne, 1, 0);
}else{
jumpInst = sqliteVdbeAddOp(v, OP_IfNot, 1, 0);
}
if( sqliteCompileList(pParse, b, pWhen->pStmt1, &skipgoto, 0) ){
return 1;
}
if( !skipgoto ) {
sqliteVdbeAddOp(v, OP_Goto, 0, j);
}
addr = sqliteVdbeCurrentAddr(v);
sqliteVdbeChangeP2(v, jumpInst, addr);
}
if( !searched ){
sqliteVdbeAddOp(v, OP_Pop, 1, 0);
}
if( pStmt->pStmt2 ){
assert( pStmt->pStmt2->op==TK_ELSE );
if( sqliteCompileList(pParse, b, pStmt->pStmt2->pStmt1, tailgoto, 0) ){
return 1;
}
}else{
sqliteVdbeOp3(v, OP_Raise, 0, 0, "CASE_NOT_FOUND", P3_STATIC);
if( tailgoto ) *tailgoto = 1;
}
sqliteVdbeResolveLabel(v, j);
break;
}
case TK_EXIT:{
if( pParse->iLoopExit==0 ) {
sqliteErrorMsg(pParse, "EXIT used outside loop statement", 0);
return 1;
}
if( pStmt->pExpr1 ) {
sqliteExprCode(pParse, pStmt->pExpr1);
sqliteVdbeAddOp(v, OP_If, 1, pParse->iLoopExit);
} else {
sqliteVdbeAddOp(v, OP_Goto, 0, pParse->iLoopExit);
if( tailgoto ) *tailgoto = 1;
}
break;
}
case TK_FOR:{
Expr *pLow = pStmt->pExpr1->pRight->pLeft;
Expr *pHigh = pStmt->pExpr1->pRight->pRight;
int iCounter, iHigh, iPrevExit;
assert( pStmt->pExpr1->op==TK_ASSIGN );
assert( pStmt->pExpr1->pLeft->op==TK_VAR );
assert( pStmt->pExpr1->pRight->op==TK_FOR );
iCounter = pParse->nMem-1;
iHigh = pParse->nMem++;
sqliteExprCode(pParse, pLow);
sqliteVdbeAddOp(v, OP_MemStore, iCounter, 1);
sqliteExprCode(pParse, pHigh);
sqliteVdbeAddOp(v, OP_MemStore, iHigh, 1);
sqliteVdbeAddOp(v, OP_MemLoad, iCounter, 0);
i = sqliteVdbeCurrentAddr(v);
sqliteVdbeAddOp(v, OP_MemLoad, iHigh, 0);
iPrevExit = pParse->iLoopExit;
pParse->iLoopExit = sqliteVdbeMakeLabel(v);
sqliteVdbeAddOp(v, OP_Gt, 1, pParse->iLoopExit);
if( sqliteCompileList(pParse, b, pStmt->pStmt1, 0, 0) ){
return 1;
}
sqliteVdbeAddOp(v, OP_MemLoad, iCounter, 0);
sqliteVdbeAddOp(v, OP_Integer, 1, 0);
sqliteVdbeAddOp(v, OP_Add, 0, 0);
sqliteVdbeAddOp(v, OP_MemStore, iCounter, 0);
sqliteVdbeAddOp(v, OP_Goto, 0, i);
sqliteVdbeResolveLabel(v, pParse->iLoopExit);
pParse->iLoopExit = iPrevExit;
hideVar(b, iCounter);
break;
}
case TK_IF: {
i = sqliteVdbeMakeLabel(v);
j = sqliteVdbeMakeLabel(v);
sqliteExprCode(pParse, pStmt->pExpr1);
sqliteVdbeAddOp(v, OP_IfNot, 1, j);
if( sqliteCompileList(pParse, b, pStmt->pStmt1, &skipgoto, 0) ){
return 1;
}
while( pStmt->pStmt2 ) {
if( !skipgoto ) {
sqliteVdbeAddOp(v, OP_Goto, 0, i);
}
sqliteVdbeResolveLabel(v, j);
j = sqliteVdbeMakeLabel(v);
pStmt = pStmt->pStmt2;
assert( pStmt->op==TK_ELSE || pStmt->op==TK_ELSIF );
if( pStmt->op==TK_ELSIF ) {
if( sqliteExprProcResolve(pParse, b, pStmt->pExpr1) ){
return 1;
}
if( sqliteExprCheck(pParse, pStmt->pExpr1, 0, 0) ){
return 1;
}
sqliteExprCode(pParse, pStmt->pExpr1);
sqliteVdbeAddOp(v, OP_IfNot, 1, j);
}
if( sqliteCompileList(pParse, b, pStmt->pStmt1, &skipgoto, 0) ){
return 1;
}
}
sqliteVdbeResolveLabel(v, i);
sqliteVdbeResolveLabel(v, j);
break;
}
case TK_LOOP:{
int iPrevExit = pParse->iLoopExit;
pParse->iLoopExit = sqliteVdbeMakeLabel(v);
i = sqliteVdbeCurrentAddr(v);
if( sqliteCompileList(pParse, b, pStmt->pStmt1, 0, 0) ){
return 1;
}
sqliteVdbeAddOp(v, OP_Goto, 0, i);
sqliteVdbeResolveLabel(v, pParse->iLoopExit);
pParse->iLoopExit = iPrevExit;
break;
}
case TK_NULL:{
break;
}
case TK_PRINT:{
sqliteExprCode(pParse, pStmt->pExpr1);
sqliteVdbeAddOp(v, OP_Print, 0, 0);
break;
}
case TK_PROCEDURE: {
Expr *pExpr = pStmt->pExpr1;
if( sqliteCompileCall(pParse, &(pExpr->token), pExpr->pList) ) {
return 1;
}
sqliteVdbeAddOp(v, OP_Pop, 1, 0);
break;
}
case TK_RAISE:{
if( pStmt->pExpr1==0 ) {
if( !in_excep ) {
sqliteErrorMsg(pParse, "RAISE without argument illegal outside exception handler", 0);
return 1;
}
sqliteVdbeOp3(v, OP_Raise, 0, 0, 0, P3_STATIC);
} else {
char *zName = 0;
sqliteSetNString(&zName, pStmt->pExpr1->token.z, pStmt->pExpr1->token.n, 0);
sqliteVdbeOp3(v, OP_Raise, 0, 0, zName, P3_DYNAMIC);
}
if( tailgoto ) *tailgoto = 1;
break;
}
case TK_RETURN:{
sqliteExprCode(pParse, pStmt->pExpr1);
sqliteVdbeAddOp(v, OP_MemStore, b->mReturn, 1);
sqliteVdbeAddOp(v, OP_Goto, 0, b->nExit);
if( tailgoto ) *tailgoto = 1;
break;
}
case TK_SQL:{
sqliteCompileSQLStmt(pParse, b, pStmt->pSql);
break;
}
case TK_WHILE:{
int iPrevExit = pParse->iLoopExit;
pParse->iLoopExit = sqliteVdbeMakeLabel(v);
i = sqliteVdbeCurrentAddr(v);
sqliteExprCode(pParse, pStmt->pExpr1);
sqliteVdbeAddOp(v, OP_IfNot, 1, pParse->iLoopExit);
if( sqliteCompileList(pParse, b, pStmt->pStmt1, 0, 0) ){
return 1;
}
sqliteVdbeAddOp(v, OP_Goto, 0, i);
sqliteVdbeResolveLabel(v, pParse->iLoopExit);
pParse->iLoopExit = iPrevExit;
break;
}
}
return 0;
}
/*
** This is called to code FOR EACH ROW triggers.
**
** When the code that this function generates is executed, the following
** must be true:
**
** 1. No cursors may be open in the main database. (But newIdx and oldIdx
** can be indices of cursors in temporary tables. See below.)
**
** 2. If the triggers being coded are ON INSERT or ON UPDATE triggers, then
** a temporary vdbe cursor (index newIdx) must be open and pointing at
** a row containing values to be substituted for new.* expressions in the
** trigger program(s).
**
** 3. If the triggers being coded are ON DELETE or ON UPDATE triggers, then
** a temporary vdbe cursor (index oldIdx) must be open and pointing at
** a row containing values to be substituted for old.* expressions in the
** trigger program(s).
**
*/
int sqliteCodeRowTrigger(
Parse *pParse, /* Parse context */
int op, /* One of TK_UPDATE, TK_INSERT, TK_DELETE */
ExprList *pChanges, /* Changes list for any UPDATE OF triggers */
int tr_tm, /* One of TK_BEFORE, TK_AFTER */
Table *pTab, /* The table to code triggers from */
int newIdx, /* The indice of the "new" row to access */
int oldIdx, /* The indice of the "old" row to access */
int orconf, /* ON CONFLICT policy */
int ignoreJump /* Instruction to jump to for RAISE(IGNORE) */
){
Trigger * pTrigger;
TriggerStack * pTriggerStack;
assert(op == TK_UPDATE || op == TK_INSERT || op == TK_DELETE);
assert(tr_tm == TK_BEFORE || tr_tm == TK_AFTER );
assert(newIdx != -1 || oldIdx != -1);
pTrigger = pTab->pTrigger;
while( pTrigger ){
int fire_this = 0;
/* determine whether we should code this trigger */
if( pTrigger->op == op && pTrigger->tr_tm == tr_tm &&
pTrigger->foreach == TK_ROW ){
fire_this = 1;
pTriggerStack = pParse->trigStack;
while( pTriggerStack ){
if( pTriggerStack->pTrigger == pTrigger ){
fire_this = 0;
}
pTriggerStack = pTriggerStack->pNext;
}
if( op == TK_UPDATE && pTrigger->pColumns &&
!checkColumnOverLap(pTrigger->pColumns, pChanges) ){
fire_this = 0;
}
}
if( fire_this && (pTriggerStack = sqliteMalloc(sizeof(TriggerStack)))!=0 ){
int endTrigger;
SrcList dummyTablist;
Expr * whenExpr;
AuthContext sContext;
dummyTablist.nSrc = 0;
/* Push an entry on to the trigger stack */
pTriggerStack->pTrigger = pTrigger;
pTriggerStack->newIdx = newIdx;
pTriggerStack->oldIdx = oldIdx;
pTriggerStack->pTab = pTab;
pTriggerStack->pNext = pParse->trigStack;
pTriggerStack->ignoreJump = ignoreJump;
pParse->trigStack = pTriggerStack;
sqliteAuthContextPush(pParse, &sContext, pTrigger->name);
/* code the WHEN clause */
endTrigger = sqliteVdbeMakeLabel(pParse->pVdbe);
whenExpr = sqliteExprDup(pTrigger->pWhen);
if( sqliteExprResolveIds(pParse, &dummyTablist, 0, whenExpr) ){
pParse->trigStack = pParse->trigStack->pNext;
sqliteFree(pTriggerStack);
sqliteExprDelete(whenExpr);
return 1;
}
sqliteExprIfFalse(pParse, whenExpr, endTrigger, 1);
sqliteExprDelete(whenExpr);
sqliteVdbeAddOp(pParse->pVdbe, OP_ContextPush, 0, 0);
codeTriggerProgram(pParse, pTrigger->step_list, orconf);
sqliteVdbeAddOp(pParse->pVdbe, OP_ContextPop, 0, 0);
/* Pop the entry off the trigger stack */
pParse->trigStack = pParse->trigStack->pNext;
sqliteAuthContextPop(&sContext);
sqliteFree(pTriggerStack);
sqliteVdbeResolveLabel(pParse->pVdbe, endTrigger);
}
pTrigger = pTrigger->pNext;
}
return 0;
}
/*
** The COPY command is for compatibility with PostgreSQL and specificially
** for the ability to read the output of pg_dump. The format is as
** follows:
**
** COPY table FROM file [USING DELIMITERS string]
**
** "table" is an existing table name. We will read lines of code from
** file to fill this table with data. File might be "stdin". The optional
** delimiter string identifies the field separators. The default is a tab.
*/
void sqliteCopy(
Parse *pParse, /* The parser context */
SrcList *pTableName, /* The name of the table into which we will insert */
Token *pFilename, /* The file from which to obtain information */
Token *pDelimiter, /* Use this as the field delimiter */
int onError /* What to do if a constraint fails */
){
Table *pTab;
int i;
Vdbe *v;
int addr, end;
char *zFile = 0;
const char *zDb;
sqlite *db = pParse->db;
if( sqlite_malloc_failed ) goto copy_cleanup;
assert( pTableName->nSrc==1 );
pTab = sqliteSrcListLookup(pParse, pTableName);
if( pTab==0 || sqliteIsReadOnly(pParse, pTab, 0) ) goto copy_cleanup;
zFile = sqliteStrNDup(pFilename->z, pFilename->n);
sqliteDequote(zFile);
assert( pTab->iDb<db->nDb );
zDb = db->aDb[pTab->iDb].zName;
if( sqliteAuthCheck(pParse, SQLITE_INSERT, pTab->zName, 0, zDb)
|| sqliteAuthCheck(pParse, SQLITE_COPY, pTab->zName, zFile, zDb) ){
goto copy_cleanup;
}
v = sqliteGetVdbe(pParse);
if( v ){
sqliteBeginWriteOperation(pParse, 1, pTab->iDb);
addr = sqliteVdbeOp3(v, OP_FileOpen, 0, 0, pFilename->z, pFilename->n);
sqliteVdbeDequoteP3(v, addr);
sqliteOpenTableAndIndices(pParse, pTab, 0);
if( db->flags & SQLITE_CountRows ){
sqliteVdbeAddOp(v, OP_Integer, 0, 0); /* Initialize the row count */
}
end = sqliteVdbeMakeLabel(v);
addr = sqliteVdbeAddOp(v, OP_FileRead, pTab->nCol, end);
if( pDelimiter ){
sqliteVdbeChangeP3(v, addr, pDelimiter->z, pDelimiter->n);
sqliteVdbeDequoteP3(v, addr);
}else{
sqliteVdbeChangeP3(v, addr, "\t", 1);
}
if( pTab->iPKey>=0 ){
sqliteVdbeAddOp(v, OP_FileColumn, pTab->iPKey, 0);
sqliteVdbeAddOp(v, OP_MustBeInt, 0, 0);
}else{
sqliteVdbeAddOp(v, OP_NewRecno, 0, 0);
}
for(i=0; i<pTab->nCol; i++){
if( i==pTab->iPKey ){
/* The integer primary key column is filled with NULL since its
** value is always pulled from the record number */
sqliteVdbeAddOp(v, OP_String, 0, 0);
}else{
sqliteVdbeAddOp(v, OP_FileColumn, i, 0);
}
}
sqliteGenerateConstraintChecks(pParse, pTab, 0, 0, pTab->iPKey>=0,
0, onError, addr);
sqliteCompleteInsertion(pParse, pTab, 0, 0, 0, 0, -1);
if( (db->flags & SQLITE_CountRows)!=0 ){
sqliteVdbeAddOp(v, OP_AddImm, 1, 0); /* Increment row count */
}
sqliteVdbeAddOp(v, OP_Goto, 0, addr);
sqliteVdbeResolveLabel(v, end);
sqliteVdbeAddOp(v, OP_Noop, 0, 0);
sqliteEndWriteOperation(pParse);
if( db->flags & SQLITE_CountRows ){
sqliteVdbeAddOp(v, OP_ColumnName, 0, 1);
sqliteVdbeChangeP3(v, -1, "rows inserted", P3_STATIC);
sqliteVdbeAddOp(v, OP_Callback, 1, 0);
}
}
copy_cleanup:
sqliteSrcListDelete(pTableName);
sqliteFree(zFile);
return;
}
/*
** This routine is call to handle SQL of the following forms:
**
** insert into TABLE (IDLIST) values(EXPRLIST)
** insert into TABLE (IDLIST) select
**
** The IDLIST following the table name is always optional. If omitted,
** then a list of all columns for the table is substituted. The IDLIST
** appears in the pColumn parameter. pColumn is NULL if IDLIST is omitted.
**
** The pList parameter holds EXPRLIST in the first form of the INSERT
** statement above, and pSelect is NULL. For the second form, pList is
** NULL and pSelect is a pointer to the select statement used to generate
** data for the insert.
**
** The code generated follows one of three templates. For a simple
** select with data coming from a VALUES clause, the code executes
** once straight down through. The template looks like this:
**
** open write cursor to <table> and its indices
** puts VALUES clause expressions onto the stack
** write the resulting record into <table>
** cleanup
**
** If the statement is of the form
**
** INSERT INTO <table> SELECT ...
**
** And the SELECT clause does not read from <table> at any time, then
** the generated code follows this template:
**
** goto B
** A: setup for the SELECT
** loop over the tables in the SELECT
** gosub C
** end loop
** cleanup after the SELECT
** goto D
** B: open write cursor to <table> and its indices
** goto A
** C: insert the select result into <table>
** return
** D: cleanup
**
** The third template is used if the insert statement takes its
** values from a SELECT but the data is being inserted into a table
** that is also read as part of the SELECT. In the third form,
** we have to use a intermediate table to store the results of
** the select. The template is like this:
**
** goto B
** A: setup for the SELECT
** loop over the tables in the SELECT
** gosub C
** end loop
** cleanup after the SELECT
** goto D
** C: insert the select result into the intermediate table
** return
** B: open a cursor to an intermediate table
** goto A
** D: open write cursor to <table> and its indices
** loop over the intermediate table
** transfer values form intermediate table into <table>
** end the loop
** cleanup
*/
void sqliteInsert(
Parse *pParse, /* Parser context */
SrcList *pTabList, /* Name of table into which we are inserting */
ExprList *pList, /* List of values to be inserted */
Select *pSelect, /* A SELECT statement to use as the data source */
IdList *pColumn, /* Column names corresponding to IDLIST. */
int onError /* How to handle constraint errors */
){
Table *pTab; /* The table to insert into */
char *zTab; /* Name of the table into which we are inserting */
const char *zDb; /* Name of the database holding this table */
int i, j, idx; /* Loop counters */
Vdbe *v; /* Generate code into this virtual machine */
Index *pIdx; /* For looping over indices of the table */
int nColumn; /* Number of columns in the data */
int base; /* VDBE Cursor number for pTab */
int iCont, iBreak; /* Beginning and end of the loop over srcTab */
sqlite *db; /* The main database structure */
int keyColumn = -1; /* Column that is the INTEGER PRIMARY KEY */
int endOfLoop; /* Label for the end of the insertion loop */
int useTempTable; /* Store SELECT results in intermediate table */
int srcTab; /* Data comes from this temporary cursor if >=0 */
int iSelectLoop; /* Address of code that implements the SELECT */
int iCleanup; /* Address of the cleanup code */
int iInsertBlock; /* Address of the subroutine used to insert data */
int iCntMem; /* Memory cell used for the row counter */
int isView; /* True if attempting to insert into a view */
int row_triggers_exist = 0; /* True if there are FOR EACH ROW triggers */
int before_triggers; /* True if there are BEFORE triggers */
int after_triggers; /* True if there are AFTER triggers */
int newIdx = -1; /* Cursor for the NEW table */
if( pParse->nErr || sqlite_malloc_failed ) goto insert_cleanup;
db = pParse->db;
/* Locate the table into which we will be inserting new information.
*/
assert( pTabList->nSrc==1 );
zTab = pTabList->a[0].zName;
if( zTab==0 ) goto insert_cleanup;
pTab = sqliteSrcListLookup(pParse, pTabList);
if( pTab==0 ){
goto insert_cleanup;
}
assert( pTab->iDb<db->nDb );
zDb = db->aDb[pTab->iDb].zName;
if( sqliteAuthCheck(pParse, SQLITE_INSERT, pTab->zName, 0, zDb) ){
goto insert_cleanup;
}
/* Ensure that:
* (a) the table is not read-only,
* (b) that if it is a view then ON INSERT triggers exist
*/
before_triggers = sqliteTriggersExist(pParse, pTab->pTrigger, TK_INSERT,
TK_BEFORE, TK_ROW, 0);
after_triggers = sqliteTriggersExist(pParse, pTab->pTrigger, TK_INSERT,
TK_AFTER, TK_ROW, 0);
row_triggers_exist = before_triggers || after_triggers;
isView = pTab->pSelect!=0;
if( sqliteIsReadOnly(pParse, pTab, before_triggers) ){
goto insert_cleanup;
}
if( pTab==0 ) goto insert_cleanup;
/* If pTab is really a view, make sure it has been initialized.
*/
if( isView && sqliteViewGetColumnNames(pParse, pTab) ){
goto insert_cleanup;
}
/* Allocate a VDBE
*/
v = sqliteGetVdbe(pParse);
if( v==0 ) goto insert_cleanup;
sqliteBeginWriteOperation(pParse, pSelect || row_triggers_exist, pTab->iDb);
/* if there are row triggers, allocate a temp table for new.* references. */
if( row_triggers_exist ){
newIdx = pParse->nTab++;
}
/* Figure out how many columns of data are supplied. If the data
** is coming from a SELECT statement, then this step also generates
** all the code to implement the SELECT statement and invoke a subroutine
** to process each row of the result. (Template 2.) If the SELECT
** statement uses the the table that is being inserted into, then the
** subroutine is also coded here. That subroutine stores the SELECT
** results in a temporary table. (Template 3.)
*/
if( pSelect ){
/* Data is coming from a SELECT. Generate code to implement that SELECT
*/
int rc, iInitCode;
iInitCode = sqliteVdbeAddOp(v, OP_Goto, 0, 0);
iSelectLoop = sqliteVdbeCurrentAddr(v);
iInsertBlock = sqliteVdbeMakeLabel(v);
rc = sqliteSelect(pParse, pSelect, SRT_Subroutine, iInsertBlock, 0,0,0);
if( rc || pParse->nErr || sqlite_malloc_failed ) goto insert_cleanup;
iCleanup = sqliteVdbeMakeLabel(v);
sqliteVdbeAddOp(v, OP_Goto, 0, iCleanup);
assert( pSelect->pEList );
nColumn = pSelect->pEList->nExpr;
/* Set useTempTable to TRUE if the result of the SELECT statement
** should be written into a temporary table. Set to FALSE if each
** row of the SELECT can be written directly into the result table.
**
** A temp table must be used if the table being updated is also one
** of the tables being read by the SELECT statement. Also use a
** temp table in the case of row triggers.
*/
if( row_triggers_exist ){
useTempTable = 1;
}else{
int addr = sqliteVdbeFindOp(v, OP_OpenRead, pTab->tnum);
useTempTable = 0;
if( addr>0 ){
VdbeOp *pOp = sqliteVdbeGetOp(v, addr-2);
if( pOp->opcode==OP_Integer && pOp->p1==pTab->iDb ){
useTempTable = 1;
}
}
}
if( useTempTable ){
/* Generate the subroutine that SELECT calls to process each row of
** the result. Store the result in a temporary table
*/
srcTab = pParse->nTab++;
sqliteVdbeResolveLabel(v, iInsertBlock);
sqliteVdbeAddOp(v, OP_MakeRecord, nColumn, 0);
sqliteVdbeAddOp(v, OP_NewRecno, srcTab, 0);
sqliteVdbeAddOp(v, OP_Pull, 1, 0);
sqliteVdbeAddOp(v, OP_PutIntKey, srcTab, 0);
sqliteVdbeAddOp(v, OP_Return, 0, 0);
/* The following code runs first because the GOTO at the very top
** of the program jumps to it. Create the temporary table, then jump
** back up and execute the SELECT code above.
*/
sqliteVdbeChangeP2(v, iInitCode, sqliteVdbeCurrentAddr(v));
sqliteVdbeAddOp(v, OP_OpenTemp, srcTab, 0);
sqliteVdbeAddOp(v, OP_Goto, 0, iSelectLoop);
sqliteVdbeResolveLabel(v, iCleanup);
}else{
sqliteVdbeChangeP2(v, iInitCode, sqliteVdbeCurrentAddr(v));
}
}else{
/* This is the case if the data for the INSERT is coming from a VALUES
** clause
*/
SrcList dummy;
assert( pList!=0 );
srcTab = -1;
useTempTable = 0;
assert( pList );
nColumn = pList->nExpr;
dummy.nSrc = 0;
for(i=0; i<nColumn; i++){
if( sqliteExprResolveIds(pParse, &dummy, 0, pList->a[i].pExpr) ){
goto insert_cleanup;
}
if( sqliteExprCheck(pParse, pList->a[i].pExpr, 0, 0) ){
goto insert_cleanup;
}
}
}
/* Make sure the number of columns in the source data matches the number
** of columns to be inserted into the table.
*/
if( pColumn==0 && nColumn!=pTab->nCol ){
sqliteErrorMsg(pParse,
"table %S has %d columns but %d values were supplied",
pTabList, 0, pTab->nCol, nColumn);
goto insert_cleanup;
}
if( pColumn!=0 && nColumn!=pColumn->nId ){
sqliteErrorMsg(pParse, "%d values for %d columns", nColumn, pColumn->nId);
goto insert_cleanup;
}
/* If the INSERT statement included an IDLIST term, then make sure
** all elements of the IDLIST really are columns of the table and
** remember the column indices.
**
** If the table has an INTEGER PRIMARY KEY column and that column
** is named in the IDLIST, then record in the keyColumn variable
** the index into IDLIST of the primary key column. keyColumn is
** the index of the primary key as it appears in IDLIST, not as
** is appears in the original table. (The index of the primary
** key in the original table is pTab->iPKey.)
*/
if( pColumn ){
for(i=0; i<pColumn->nId; i++){
pColumn->a[i].idx = -1;
}
for(i=0; i<pColumn->nId; i++){
for(j=0; j<pTab->nCol; j++){
if( sqliteStrICmp(pColumn->a[i].zName, pTab->aCol[j].zName)==0 ){
pColumn->a[i].idx = j;
if( j==pTab->iPKey ){
keyColumn = i;
}
break;
}
}
if( j>=pTab->nCol ){
if( sqliteIsRowid(pColumn->a[i].zName) ){
keyColumn = i;
}else{
sqliteErrorMsg(pParse, "table %S has no column named %s",
pTabList, 0, pColumn->a[i].zName);
pParse->nErr++;
goto insert_cleanup;
}
}
}
}
/* If there is no IDLIST term but the table has an integer primary
** key, the set the keyColumn variable to the primary key column index
** in the original table definition.
*/
if( pColumn==0 ){
keyColumn = pTab->iPKey;
}
/* Open the temp table for FOR EACH ROW triggers
*/
if( row_triggers_exist ){
sqliteVdbeAddOp(v, OP_OpenPseudo, newIdx, 0);
}
/* Initialize the count of rows to be inserted
*/
if( db->flags & SQLITE_CountRows ){
iCntMem = pParse->nMem++;
sqliteVdbeAddOp(v, OP_Integer, 0, 0);
sqliteVdbeAddOp(v, OP_MemStore, iCntMem, 1);
}
/* Open tables and indices if there are no row triggers */
if( !row_triggers_exist ){
base = pParse->nTab;
idx = sqliteOpenTableAndIndices(pParse, pTab, base);
pParse->nTab += idx;
}
/* If the data source is a temporary table, then we have to create
** a loop because there might be multiple rows of data. If the data
** source is a subroutine call from the SELECT statement, then we need
** to launch the SELECT statement processing.
*/
if( useTempTable ){
iBreak = sqliteVdbeMakeLabel(v);
sqliteVdbeAddOp(v, OP_Rewind, srcTab, iBreak);
iCont = sqliteVdbeCurrentAddr(v);
}else if( pSelect ){
sqliteVdbeAddOp(v, OP_Goto, 0, iSelectLoop);
sqliteVdbeResolveLabel(v, iInsertBlock);
}
/* Run the BEFORE and INSTEAD OF triggers, if there are any
*/
endOfLoop = sqliteVdbeMakeLabel(v);
if( before_triggers ){
/* build the NEW.* reference row. Note that if there is an INTEGER
** PRIMARY KEY into which a NULL is being inserted, that NULL will be
** translated into a unique ID for the row. But on a BEFORE trigger,
** we do not know what the unique ID will be (because the insert has
** not happened yet) so we substitute a rowid of -1
*/
if( keyColumn<0 ){
sqliteVdbeAddOp(v, OP_Integer, -1, 0);
}else if( useTempTable ){
sqliteVdbeAddOp(v, OP_Column, srcTab, keyColumn);
}else if( pSelect ){
sqliteVdbeAddOp(v, OP_Dup, nColumn - keyColumn - 1, 1);
}else{
sqliteExprCode(pParse, pList->a[keyColumn].pExpr);
sqliteVdbeAddOp(v, OP_NotNull, -1, sqliteVdbeCurrentAddr(v)+3);
sqliteVdbeAddOp(v, OP_Pop, 1, 0);
sqliteVdbeAddOp(v, OP_Integer, -1, 0);
sqliteVdbeAddOp(v, OP_MustBeInt, 0, 0);
}
/* Create the new column data
*/
for(i=0; i<pTab->nCol; i++){
if( pColumn==0 ){
j = i;
}else{
for(j=0; j<pColumn->nId; j++){
if( pColumn->a[j].idx==i ) break;
}
}
if( pColumn && j>=pColumn->nId ){
sqliteVdbeOp3(v, OP_String, 0, 0, pTab->aCol[i].zDflt, P3_STATIC);
}else if( useTempTable ){
sqliteVdbeAddOp(v, OP_Column, srcTab, j);
}else if( pSelect ){
sqliteVdbeAddOp(v, OP_Dup, nColumn-j-1, 1);
}else{
sqliteExprCode(pParse, pList->a[j].pExpr);
}
}
sqliteVdbeAddOp(v, OP_MakeRecord, pTab->nCol, 0);
sqliteVdbeAddOp(v, OP_PutIntKey, newIdx, 0);
/* Fire BEFORE or INSTEAD OF triggers */
if( sqliteCodeRowTrigger(pParse, TK_INSERT, 0, TK_BEFORE, pTab,
newIdx, -1, onError, endOfLoop) ){
goto insert_cleanup;
}
}
/* If any triggers exists, the opening of tables and indices is deferred
** until now.
*/
if( row_triggers_exist && !isView ){
base = pParse->nTab;
idx = sqliteOpenTableAndIndices(pParse, pTab, base);
pParse->nTab += idx;
}
/* Push the record number for the new entry onto the stack. The
** record number is a randomly generate integer created by NewRecno
** except when the table has an INTEGER PRIMARY KEY column, in which
** case the record number is the same as that column.
*/
if( !isView ){
if( keyColumn>=0 ){
if( useTempTable ){
sqliteVdbeAddOp(v, OP_Column, srcTab, keyColumn);
}else if( pSelect ){
sqliteVdbeAddOp(v, OP_Dup, nColumn - keyColumn - 1, 1);
}else{
sqliteExprCode(pParse, pList->a[keyColumn].pExpr);
}
/* If the PRIMARY KEY expression is NULL, then use OP_NewRecno
** to generate a unique primary key value.
*/
sqliteVdbeAddOp(v, OP_NotNull, -1, sqliteVdbeCurrentAddr(v)+3);
sqliteVdbeAddOp(v, OP_Pop, 1, 0);
sqliteVdbeAddOp(v, OP_NewRecno, base, 0);
sqliteVdbeAddOp(v, OP_MustBeInt, 0, 0);
}else{
sqliteVdbeAddOp(v, OP_NewRecno, base, 0);
}
/* Push onto the stack, data for all columns of the new entry, beginning
** with the first column.
*/
for(i=0; i<pTab->nCol; i++){
if( i==pTab->iPKey ){
/* The value of the INTEGER PRIMARY KEY column is always a NULL.
** Whenever this column is read, the record number will be substituted
** in its place. So will fill this column with a NULL to avoid
** taking up data space with information that will never be used. */
sqliteVdbeAddOp(v, OP_String, 0, 0);
continue;
}
if( pColumn==0 ){
j = i;
}else{
for(j=0; j<pColumn->nId; j++){
if( pColumn->a[j].idx==i ) break;
}
}
if( pColumn && j>=pColumn->nId ){
sqliteVdbeOp3(v, OP_String, 0, 0, pTab->aCol[i].zDflt, P3_STATIC);
}else if( useTempTable ){
sqliteVdbeAddOp(v, OP_Column, srcTab, j);
}else if( pSelect ){
sqliteVdbeAddOp(v, OP_Dup, i+nColumn-j, 1);
}else{
sqliteExprCode(pParse, pList->a[j].pExpr);
}
}
/* Generate code to check constraints and generate index keys and
** do the insertion.
*/
sqliteGenerateConstraintChecks(pParse, pTab, base, 0, keyColumn>=0,
0, onError, endOfLoop);
sqliteCompleteInsertion(pParse, pTab, base, 0,0,0,
after_triggers ? newIdx : -1);
}
/* Update the count of rows that are inserted
*/
if( (db->flags & SQLITE_CountRows)!=0 ){
sqliteVdbeAddOp(v, OP_MemIncr, iCntMem, 0);
}
if( row_triggers_exist ){
/* Close all tables opened */
if( !isView ){
sqliteVdbeAddOp(v, OP_Close, base, 0);
for(idx=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, idx++){
sqliteVdbeAddOp(v, OP_Close, idx+base, 0);
}
}
/* Code AFTER triggers */
if( sqliteCodeRowTrigger(pParse, TK_INSERT, 0, TK_AFTER, pTab, newIdx, -1,
onError, endOfLoop) ){
goto insert_cleanup;
}
}
/* The bottom of the loop, if the data source is a SELECT statement
*/
sqliteVdbeResolveLabel(v, endOfLoop);
if( useTempTable ){
sqliteVdbeAddOp(v, OP_Next, srcTab, iCont);
sqliteVdbeResolveLabel(v, iBreak);
sqliteVdbeAddOp(v, OP_Close, srcTab, 0);
}else if( pSelect ){
sqliteVdbeAddOp(v, OP_Pop, nColumn, 0);
sqliteVdbeAddOp(v, OP_Return, 0, 0);
sqliteVdbeResolveLabel(v, iCleanup);
}
if( !row_triggers_exist ){
/* Close all tables opened */
sqliteVdbeAddOp(v, OP_Close, base, 0);
for(idx=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, idx++){
sqliteVdbeAddOp(v, OP_Close, idx+base, 0);
}
}
sqliteVdbeAddOp(v, OP_SetCounts, 0, 0);
sqliteEndWriteOperation(pParse);
/*
** Return the number of rows inserted.
*/
if( db->flags & SQLITE_CountRows ){
sqliteVdbeOp3(v, OP_ColumnName, 0, 1, "rows inserted", P3_STATIC);
sqliteVdbeAddOp(v, OP_MemLoad, iCntMem, 0);
sqliteVdbeAddOp(v, OP_Callback, 1, 0);
}
insert_cleanup:
sqliteSrcListDelete(pTabList);
if( pList ) sqliteExprListDelete(pList);
if( pSelect ) sqliteSelectDelete(pSelect);
sqliteIdListDelete(pColumn);
}
/*
** Generate code for a boolean expression such that a jump is made
** to the label "dest" if the expression is false but execution
** continues straight thru if the expression is true.
**
** If the expression evaluates to NULL (neither true nor false) then
** jump if jumpIfNull is true or fall through if jumpIfNull is false.
*/
void sqliteExprIfFalse(Parse *pParse, Expr *pExpr, int dest, int jumpIfNull){
Vdbe *v = pParse->pVdbe;
int op = 0;
if( v==0 || pExpr==0 ) return;
switch( pExpr->op ){
case TK_LT: op = OP_Ge; break;
case TK_LE: op = OP_Gt; break;
case TK_GT: op = OP_Le; break;
case TK_GE: op = OP_Lt; break;
case TK_NE: op = OP_Eq; break;
case TK_EQ: op = OP_Ne; break;
case TK_ISNULL: op = OP_NotNull; break;
case TK_NOTNULL: op = OP_IsNull; break;
default: break;
}
switch( pExpr->op ){
case TK_AND: {
sqliteExprIfFalse(pParse, pExpr->pLeft, dest, jumpIfNull);
sqliteExprIfFalse(pParse, pExpr->pRight, dest, jumpIfNull);
break;
}
case TK_OR: {
int d2 = sqliteVdbeMakeLabel(v);
sqliteExprIfTrue(pParse, pExpr->pLeft, d2, !jumpIfNull);
sqliteExprIfFalse(pParse, pExpr->pRight, dest, jumpIfNull);
sqliteVdbeResolveLabel(v, d2);
break;
}
case TK_NOT: {
sqliteExprIfTrue(pParse, pExpr->pLeft, dest, jumpIfNull);
break;
}
case TK_LT:
case TK_LE:
case TK_GT:
case TK_GE:
case TK_NE:
case TK_EQ: {
if( pParse->db->file_format>=4 && sqliteExprType(pExpr)==SQLITE_SO_TEXT ){
/* Convert numeric comparison opcodes into text comparison opcodes.
** This step depends on the fact that the text comparision opcodes are
** always 6 greater than their corresponding numeric comparison
** opcodes.
*/
assert( OP_Eq+6 == OP_StrEq );
op += 6;
}
sqliteExprCode(pParse, pExpr->pLeft);
sqliteExprCode(pParse, pExpr->pRight);
sqliteVdbeAddOp(v, op, jumpIfNull, dest);
break;
}
case TK_ISNULL:
case TK_NOTNULL: {
sqliteExprCode(pParse, pExpr->pLeft);
sqliteVdbeAddOp(v, op, 1, dest);
break;
}
case TK_IN: {
int addr;
sqliteExprCode(pParse, pExpr->pLeft);
addr = sqliteVdbeCurrentAddr(v);
sqliteVdbeAddOp(v, OP_NotNull, -1, addr+3);
sqliteVdbeAddOp(v, OP_Pop, 1, 0);
sqliteVdbeAddOp(v, OP_Goto, 0, jumpIfNull ? dest : addr+4);
if( pExpr->pSelect ){
sqliteVdbeAddOp(v, OP_NotFound, pExpr->iTable, dest);
}else{
sqliteVdbeAddOp(v, OP_SetNotFound, pExpr->iTable, dest);
}
break;
}
case TK_BETWEEN: {
int addr;
sqliteExprCode(pParse, pExpr->pLeft);
sqliteVdbeAddOp(v, OP_Dup, 0, 0);
sqliteExprCode(pParse, pExpr->pList->a[0].pExpr);
addr = sqliteVdbeCurrentAddr(v);
sqliteVdbeAddOp(v, OP_Ge, !jumpIfNull, addr+3);
sqliteVdbeAddOp(v, OP_Pop, 1, 0);
sqliteVdbeAddOp(v, OP_Goto, 0, dest);
sqliteExprCode(pParse, pExpr->pList->a[1].pExpr);
sqliteVdbeAddOp(v, OP_Gt, jumpIfNull, dest);
break;
}
default: {
sqliteExprCode(pParse, pExpr);
sqliteVdbeAddOp(v, OP_IfNot, jumpIfNull, dest);
break;
}
}
}
/*
** Generate code for a boolean expression such that a jump is made
** to the label "dest" if the expression is true but execution
** continues straight thru if the expression is false.
**
** If the expression evaluates to NULL (neither true nor false), then
** take the jump if the jumpIfNull flag is true.
*/
void sqliteExprIfTrue(Parse *pParse, Expr *pExpr, int dest, int jumpIfNull){
Vdbe *v = pParse->pVdbe;
int op = 0;
if( v==0 || pExpr==0 ) return;
switch( pExpr->op ){
case TK_LT: op = OP_Lt; break;
case TK_LE: op = OP_Le; break;
case TK_GT: op = OP_Gt; break;
case TK_GE: op = OP_Ge; break;
case TK_NE: op = OP_Ne; break;
case TK_EQ: op = OP_Eq; break;
case TK_ISNULL: op = OP_IsNull; break;
case TK_NOTNULL: op = OP_NotNull; break;
default: break;
}
switch( pExpr->op ){
case TK_AND: {
int d2 = sqliteVdbeMakeLabel(v);
sqliteExprIfFalse(pParse, pExpr->pLeft, d2, !jumpIfNull);
sqliteExprIfTrue(pParse, pExpr->pRight, dest, jumpIfNull);
sqliteVdbeResolveLabel(v, d2);
break;
}
case TK_OR: {
sqliteExprIfTrue(pParse, pExpr->pLeft, dest, jumpIfNull);
sqliteExprIfTrue(pParse, pExpr->pRight, dest, jumpIfNull);
break;
}
case TK_NOT: {
sqliteExprIfFalse(pParse, pExpr->pLeft, dest, jumpIfNull);
break;
}
case TK_LT:
case TK_LE:
case TK_GT:
case TK_GE:
case TK_NE:
case TK_EQ: {
sqliteExprCode(pParse, pExpr->pLeft);
sqliteExprCode(pParse, pExpr->pRight);
if( pParse->db->file_format>=4 && sqliteExprType(pExpr)==SQLITE_SO_TEXT ){
op += 6; /* Convert numeric opcodes to text opcodes */
}
sqliteVdbeAddOp(v, op, jumpIfNull, dest);
break;
}
case TK_ISNULL:
case TK_NOTNULL: {
sqliteExprCode(pParse, pExpr->pLeft);
sqliteVdbeAddOp(v, op, 1, dest);
break;
}
case TK_IN: {
int addr;
sqliteExprCode(pParse, pExpr->pLeft);
addr = sqliteVdbeCurrentAddr(v);
sqliteVdbeAddOp(v, OP_NotNull, -1, addr+3);
sqliteVdbeAddOp(v, OP_Pop, 1, 0);
sqliteVdbeAddOp(v, OP_Goto, 0, jumpIfNull ? dest : addr+4);
if( pExpr->pSelect ){
sqliteVdbeAddOp(v, OP_Found, pExpr->iTable, dest);
}else{
sqliteVdbeAddOp(v, OP_SetFound, pExpr->iTable, dest);
}
break;
}
case TK_BETWEEN: {
int addr;
sqliteExprCode(pParse, pExpr->pLeft);
sqliteVdbeAddOp(v, OP_Dup, 0, 0);
sqliteExprCode(pParse, pExpr->pList->a[0].pExpr);
addr = sqliteVdbeAddOp(v, OP_Lt, !jumpIfNull, 0);
sqliteExprCode(pParse, pExpr->pList->a[1].pExpr);
sqliteVdbeAddOp(v, OP_Le, jumpIfNull, dest);
sqliteVdbeAddOp(v, OP_Integer, 0, 0);
sqliteVdbeChangeP2(v, addr, sqliteVdbeCurrentAddr(v));
sqliteVdbeAddOp(v, OP_Pop, 1, 0);
break;
}
default: {
sqliteExprCode(pParse, pExpr);
sqliteVdbeAddOp(v, OP_If, jumpIfNull, dest);
break;
}
}
}
/*
** Generate code into the current Vdbe to evaluate the given
** expression and leave the result on the top of stack.
*/
void sqliteExprCode(Parse *pParse, Expr *pExpr){
Vdbe *v = pParse->pVdbe;
int op;
if( v==0 || pExpr==0 ) return;
switch( pExpr->op ){
case TK_PLUS: op = OP_Add; break;
case TK_MINUS: op = OP_Subtract; break;
case TK_STAR: op = OP_Multiply; break;
case TK_SLASH: op = OP_Divide; break;
case TK_AND: op = OP_And; break;
case TK_OR: op = OP_Or; break;
case TK_LT: op = OP_Lt; break;
case TK_LE: op = OP_Le; break;
case TK_GT: op = OP_Gt; break;
case TK_GE: op = OP_Ge; break;
case TK_NE: op = OP_Ne; break;
case TK_EQ: op = OP_Eq; break;
case TK_ISNULL: op = OP_IsNull; break;
case TK_NOTNULL: op = OP_NotNull; break;
case TK_NOT: op = OP_Not; break;
case TK_UMINUS: op = OP_Negative; break;
case TK_BITAND: op = OP_BitAnd; break;
case TK_BITOR: op = OP_BitOr; break;
case TK_BITNOT: op = OP_BitNot; break;
case TK_LSHIFT: op = OP_ShiftLeft; break;
case TK_RSHIFT: op = OP_ShiftRight; break;
case TK_REM: op = OP_Remainder; break;
default: break;
}
switch( pExpr->op ){
case TK_COLUMN: {
if( pParse->useAgg ){
sqliteVdbeAddOp(v, OP_AggGet, 0, pExpr->iAgg);
}else if( pExpr->iColumn>=0 ){
sqliteVdbeAddOp(v, OP_Column, pExpr->iTable, pExpr->iColumn);
}else{
sqliteVdbeAddOp(v, OP_Recno, pExpr->iTable, 0);
}
break;
}
case TK_STRING:
case TK_FLOAT:
case TK_INTEGER: {
if( pExpr->op==TK_INTEGER && sqliteFitsIn32Bits(pExpr->token.z) ){
sqliteVdbeAddOp(v, OP_Integer, atoi(pExpr->token.z), 0);
}else{
sqliteVdbeAddOp(v, OP_String, 0, 0);
}
assert( pExpr->token.z );
sqliteVdbeChangeP3(v, -1, pExpr->token.z, pExpr->token.n);
sqliteVdbeDequoteP3(v, -1);
break;
}
case TK_NULL: {
sqliteVdbeAddOp(v, OP_String, 0, 0);
break;
}
case TK_VARIABLE: {
sqliteVdbeAddOp(v, OP_Variable, pExpr->iTable, 0);
break;
}
case TK_LT:
case TK_LE:
case TK_GT:
case TK_GE:
case TK_NE:
case TK_EQ: {
if( pParse->db->file_format>=4 && sqliteExprType(pExpr)==SQLITE_SO_TEXT ){
op += 6; /* Convert numeric opcodes to text opcodes */
}
/* Fall through into the next case */
}
case TK_AND:
case TK_OR:
case TK_PLUS:
case TK_STAR:
case TK_MINUS:
case TK_REM:
case TK_BITAND:
case TK_BITOR:
case TK_SLASH: {
sqliteExprCode(pParse, pExpr->pLeft);
sqliteExprCode(pParse, pExpr->pRight);
sqliteVdbeAddOp(v, op, 0, 0);
break;
}
case TK_LSHIFT:
case TK_RSHIFT: {
sqliteExprCode(pParse, pExpr->pRight);
sqliteExprCode(pParse, pExpr->pLeft);
sqliteVdbeAddOp(v, op, 0, 0);
break;
}
case TK_CONCAT: {
sqliteExprCode(pParse, pExpr->pLeft);
sqliteExprCode(pParse, pExpr->pRight);
sqliteVdbeAddOp(v, OP_Concat, 2, 0);
break;
}
case TK_UMINUS: {
assert( pExpr->pLeft );
if( pExpr->pLeft->op==TK_FLOAT || pExpr->pLeft->op==TK_INTEGER ){
Token *p = &pExpr->pLeft->token;
char *z = sqliteMalloc( p->n + 2 );
sprintf(z, "-%.*s", p->n, p->z);
if( pExpr->pLeft->op==TK_INTEGER && sqliteFitsIn32Bits(z) ){
sqliteVdbeAddOp(v, OP_Integer, atoi(z), 0);
}else{
sqliteVdbeAddOp(v, OP_String, 0, 0);
}
sqliteVdbeChangeP3(v, -1, z, p->n+1);
sqliteFree(z);
break;
}
/* Fall through into TK_NOT */
}
case TK_BITNOT:
case TK_NOT: {
sqliteExprCode(pParse, pExpr->pLeft);
sqliteVdbeAddOp(v, op, 0, 0);
break;
}
case TK_ISNULL:
case TK_NOTNULL: {
int dest;
sqliteVdbeAddOp(v, OP_Integer, 1, 0);
sqliteExprCode(pParse, pExpr->pLeft);
dest = sqliteVdbeCurrentAddr(v) + 2;
sqliteVdbeAddOp(v, op, 1, dest);
sqliteVdbeAddOp(v, OP_AddImm, -1, 0);
break;
}
case TK_AGG_FUNCTION: {
sqliteVdbeAddOp(v, OP_AggGet, 0, pExpr->iAgg);
break;
}
case TK_GLOB:
case TK_LIKE:
case TK_FUNCTION: {
ExprList *pList = pExpr->pList;
int nExpr = pList ? pList->nExpr : 0;
FuncDef *pDef;
int nId;
const char *zId;
getFunctionName(pExpr, &zId, &nId);
pDef = sqliteFindFunction(pParse->db, zId, nId, nExpr, 0);
assert( pDef!=0 );
nExpr = sqliteExprCodeExprList(pParse, pList, pDef->includeTypes);
sqliteVdbeOp3(v, OP_Function, nExpr, 0, (char*)pDef, P3_POINTER);
break;
}
case TK_SELECT: {
sqliteVdbeAddOp(v, OP_MemLoad, pExpr->iColumn, 0);
break;
}
case TK_IN: {
int addr;
sqliteVdbeAddOp(v, OP_Integer, 1, 0);
sqliteExprCode(pParse, pExpr->pLeft);
addr = sqliteVdbeCurrentAddr(v);
sqliteVdbeAddOp(v, OP_NotNull, -1, addr+4);
sqliteVdbeAddOp(v, OP_Pop, 1, 0);
sqliteVdbeAddOp(v, OP_String, 0, 0);
sqliteVdbeAddOp(v, OP_Goto, 0, addr+6);
if( pExpr->pSelect ){
sqliteVdbeAddOp(v, OP_Found, pExpr->iTable, addr+6);
}else{
sqliteVdbeAddOp(v, OP_SetFound, pExpr->iTable, addr+6);
}
sqliteVdbeAddOp(v, OP_AddImm, -1, 0);
break;
}
case TK_BETWEEN: {
sqliteExprCode(pParse, pExpr->pLeft);
sqliteVdbeAddOp(v, OP_Dup, 0, 0);
sqliteExprCode(pParse, pExpr->pList->a[0].pExpr);
sqliteVdbeAddOp(v, OP_Ge, 0, 0);
sqliteVdbeAddOp(v, OP_Pull, 1, 0);
sqliteExprCode(pParse, pExpr->pList->a[1].pExpr);
sqliteVdbeAddOp(v, OP_Le, 0, 0);
sqliteVdbeAddOp(v, OP_And, 0, 0);
break;
}
case TK_UPLUS:
case TK_AS: {
sqliteExprCode(pParse, pExpr->pLeft);
break;
}
case TK_CASE: {
int expr_end_label;
int jumpInst;
int addr;
int nExpr;
int i;
assert(pExpr->pList);
assert((pExpr->pList->nExpr % 2) == 0);
assert(pExpr->pList->nExpr > 0);
nExpr = pExpr->pList->nExpr;
expr_end_label = sqliteVdbeMakeLabel(v);
if( pExpr->pLeft ){
sqliteExprCode(pParse, pExpr->pLeft);
}
for(i=0; i<nExpr; i=i+2){
sqliteExprCode(pParse, pExpr->pList->a[i].pExpr);
if( pExpr->pLeft ){
sqliteVdbeAddOp(v, OP_Dup, 1, 1);
jumpInst = sqliteVdbeAddOp(v, OP_Ne, 1, 0);
sqliteVdbeAddOp(v, OP_Pop, 1, 0);
}else{
jumpInst = sqliteVdbeAddOp(v, OP_IfNot, 1, 0);
}
sqliteExprCode(pParse, pExpr->pList->a[i+1].pExpr);
sqliteVdbeAddOp(v, OP_Goto, 0, expr_end_label);
addr = sqliteVdbeCurrentAddr(v);
sqliteVdbeChangeP2(v, jumpInst, addr);
}
if( pExpr->pLeft ){
sqliteVdbeAddOp(v, OP_Pop, 1, 0);
}
if( pExpr->pRight ){
sqliteExprCode(pParse, pExpr->pRight);
}else{
sqliteVdbeAddOp(v, OP_String, 0, 0);
}
sqliteVdbeResolveLabel(v, expr_end_label);
break;
}
case TK_RAISE: {
if( !pParse->trigStack ){
sqliteErrorMsg(pParse,
"RAISE() may only be used within a trigger-program");
pParse->nErr++;
return;
}
if( pExpr->iColumn == OE_Rollback ||
pExpr->iColumn == OE_Abort ||
pExpr->iColumn == OE_Fail ){
sqliteVdbeOp3(v, OP_Halt, SQLITE_CONSTRAINT, pExpr->iColumn,
pExpr->token.z, pExpr->token.n);
sqliteVdbeDequoteP3(v, -1);
} else {
assert( pExpr->iColumn == OE_Ignore );
sqliteVdbeOp3(v, OP_Goto, 0, pParse->trigStack->ignoreJump,
"(IGNORE jump)", 0);
}
}
break;
}
}