static int GetPager(sqlite3 *db, const char *zName,
Pager **pPager, unsigned *pnPageSize){
Btree *pBt = NULL;
int i;
for( i=0; i<db->nDb; ++i ){
if( ascii_strcasecmp(db->aDb[i].zName, zName)==0 ){
pBt = db->aDb[i].pBt;
break;
}
}
if( !pBt ){
return SQLITE_ERROR;
}
*pPager = sqlite3BtreePager(pBt);
*pnPageSize = sqlite3BtreeGetPageSize(pBt) - sqlite3BtreeGetReserve(pBt);
return SQLITE_OK;
}
/*
** This routine implements the OP_Vacuum opcode of the VDBE.
*/
int sqlite3RunVacuum(char **pzErrMsg, sqlite3 *db){
int rc = SQLITE_OK; /* Return code from service routines */
const char *zFilename; /* full pathname of the database file */
int nFilename; /* number of characters in zFilename[] */
char *zTemp = 0; /* a temporary file in same directory as zFilename */
Btree *pMain; /* The database being vacuumed */
Btree *pTemp;
char *zSql = 0;
int saved_flags; /* Saved value of the db->flags */
Db *pDb = 0; /* Database to detach at end of vacuum */
/* Save the current value of the write-schema flag before setting it. */
saved_flags = db->flags;
db->flags |= SQLITE_WriteSchema | SQLITE_IgnoreChecks;
if( !db->autoCommit ){
sqlite3SetString(pzErrMsg, "cannot VACUUM from within a transaction",
(char*)0);
rc = SQLITE_ERROR;
goto end_of_vacuum;
}
/* Get the full pathname of the database file and create a
** temporary filename in the same directory as the original file.
*/
pMain = db->aDb[0].pBt;
zFilename = sqlite3BtreeGetFilename(pMain);
assert( zFilename );
if( zFilename[0]=='\0' ){
/* The in-memory database. Do nothing. Return directly to avoid causing
** an error trying to DETACH the vacuum_db (which never got attached)
** in the exit-handler.
*/
return SQLITE_OK;
}
nFilename = strlen(zFilename);
zTemp = sqliteMalloc( nFilename+100 );
if( zTemp==0 ){
rc = SQLITE_NOMEM;
goto end_of_vacuum;
}
strcpy(zTemp, zFilename);
/* The randomName() procedure in the following loop uses an excellent
** source of randomness to generate a name from a space of 1.3e+31
** possibilities. So unless the directory already contains on the order
** of 1.3e+31 files, the probability that the following loop will
** run more than once or twice is vanishingly small. We are certain
** enough that this loop will always terminate (and terminate quickly)
** that we don't even bother to set a maximum loop count.
*/
do {
zTemp[nFilename] = '-';
randomName((unsigned char*)&zTemp[nFilename+1]);
} while( sqlite3OsFileExists(zTemp) );
/* Attach the temporary database as 'vacuum_db'. The synchronous pragma
** can be set to 'off' for this file, as it is not recovered if a crash
** occurs anyway. The integrity of the database is maintained by a
** (possibly synchronous) transaction opened on the main database before
** sqlite3BtreeCopyFile() is called.
**
** An optimisation would be to use a non-journaled pager.
*/
zSql = sqlite3MPrintf("ATTACH '%q' AS vacuum_db;", zTemp);
if( !zSql ){
rc = SQLITE_NOMEM;
goto end_of_vacuum;
}
rc = execSql(db, zSql);
sqliteFree(zSql);
zSql = 0;
if( rc!=SQLITE_OK ) goto end_of_vacuum;
pDb = &db->aDb[db->nDb-1];
assert( strcmp(db->aDb[db->nDb-1].zName,"vacuum_db")==0 );
pTemp = db->aDb[db->nDb-1].pBt;
sqlite3BtreeSetPageSize(pTemp, sqlite3BtreeGetPageSize(pMain),
sqlite3BtreeGetReserve(pMain));
assert( sqlite3BtreeGetPageSize(pTemp)==sqlite3BtreeGetPageSize(pMain) );
rc = execSql(db, "PRAGMA vacuum_db.synchronous=OFF");
if( rc!=SQLITE_OK ){
goto end_of_vacuum;
}
#ifndef SQLITE_OMIT_AUTOVACUUM
sqlite3BtreeSetAutoVacuum(pTemp, sqlite3BtreeGetAutoVacuum(pMain));
#endif
/* Begin a transaction */
rc = execSql(db, "BEGIN EXCLUSIVE;");
if( rc!=SQLITE_OK ) goto end_of_vacuum;
/* Query the schema of the main database. Create a mirror schema
** in the temporary database.
*/
rc = execExecSql(db,
"SELECT 'CREATE TABLE vacuum_db.' || substr(sql,14,100000000) "
" FROM sqlite_master WHERE type='table' AND name!='sqlite_sequence'"
" AND rootpage>0"
);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
rc = execExecSql(db,
"SELECT 'CREATE INDEX vacuum_db.' || substr(sql,14,100000000)"
" FROM sqlite_master WHERE sql LIKE 'CREATE INDEX %' ");
if( rc!=SQLITE_OK ) goto end_of_vacuum;
rc = execExecSql(db,
"SELECT 'CREATE UNIQUE INDEX vacuum_db.' || substr(sql,21,100000000) "
" FROM sqlite_master WHERE sql LIKE 'CREATE UNIQUE INDEX %'");
if( rc!=SQLITE_OK ) goto end_of_vacuum;
/* Loop through the tables in the main database. For each, do
** an "INSERT INTO vacuum_db.xxx SELECT * FROM xxx;" to copy
** the contents to the temporary database.
*/
rc = execExecSql(db,
"SELECT 'INSERT INTO vacuum_db.' || quote(name) "
"|| ' SELECT * FROM ' || quote(name) || ';'"
"FROM sqlite_master "
"WHERE type = 'table' AND name!='sqlite_sequence' "
" AND rootpage>0"
);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
/* Copy over the sequence table
*/
rc = execExecSql(db,
"SELECT 'DELETE FROM vacuum_db.' || quote(name) || ';' "
"FROM vacuum_db.sqlite_master WHERE name='sqlite_sequence' "
);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
rc = execExecSql(db,
"SELECT 'INSERT INTO vacuum_db.' || quote(name) "
"|| ' SELECT * FROM ' || quote(name) || ';' "
"FROM vacuum_db.sqlite_master WHERE name=='sqlite_sequence';"
);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
/* Copy the triggers, views, and virtual tables from the main database
** over to the temporary database. None of these objects has any
** associated storage, so all we have to do is copy their entries
** from the SQLITE_MASTER table.
*/
rc = execSql(db,
"INSERT INTO vacuum_db.sqlite_master "
" SELECT type, name, tbl_name, rootpage, sql"
" FROM sqlite_master"
" WHERE type='view' OR type='trigger'"
" OR (type='table' AND rootpage=0)"
);
if( rc ) goto end_of_vacuum;
/* At this point, unless the main db was completely empty, there is now a
** transaction open on the vacuum database, but not on the main database.
** Open a btree level transaction on the main database. This allows a
** call to sqlite3BtreeCopyFile(). The main database btree level
** transaction is then committed, so the SQL level never knows it was
** opened for writing. This way, the SQL transaction used to create the
** temporary database never needs to be committed.
*/
if( rc==SQLITE_OK ){
u32 meta;
int i;
/* This array determines which meta meta values are preserved in the
** vacuum. Even entries are the meta value number and odd entries
** are an increment to apply to the meta value after the vacuum.
** The increment is used to increase the schema cookie so that other
** connections to the same database will know to reread the schema.
*/
static const unsigned char aCopy[] = {
1, 1, /* Add one to the old schema cookie */
3, 0, /* Preserve the default page cache size */
5, 0, /* Preserve the default text encoding */
6, 0, /* Preserve the user version */
};
assert( 1==sqlite3BtreeIsInTrans(pTemp) );
assert( 1==sqlite3BtreeIsInTrans(pMain) );
/* Copy Btree meta values */
for(i=0; i<sizeof(aCopy)/sizeof(aCopy[0]); i+=2){
rc = sqlite3BtreeGetMeta(pMain, aCopy[i], &meta);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
rc = sqlite3BtreeUpdateMeta(pTemp, aCopy[i], meta+aCopy[i+1]);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
}
rc = sqlite3BtreeCopyFile(pMain, pTemp);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
rc = sqlite3BtreeCommit(pTemp);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
rc = sqlite3BtreeCommit(pMain);
}
end_of_vacuum:
/* Restore the original value of db->flags */
db->flags = saved_flags;
/* Currently there is an SQL level transaction open on the vacuum
** database. No locks are held on any other files (since the main file
** was committed at the btree level). So it safe to end the transaction
** by manually setting the autoCommit flag to true and detaching the
** vacuum database. The vacuum_db journal file is deleted when the pager
** is closed by the DETACH.
*/
db->autoCommit = 1;
if( pDb ){
sqlite3MallocDisallow();
sqlite3BtreeClose(pDb->pBt);
sqlite3MallocAllow();
pDb->pBt = 0;
pDb->pSchema = 0;
}
if( zTemp ){
sqlite3OsDelete(zTemp);
sqliteFree(zTemp);
}
sqliteFree( zSql );
sqlite3ResetInternalSchema(db, 0);
return rc;
}
/*
** This routine implements the OP_Vacuum opcode of the VDBE.
*/
int sqlite3RunVacuum(char **pzErrMsg, sqlite3 *db){
int rc = SQLITE_OK; /* Return code from service routines */
Btree *pMain; /* The database being vacuumed */
Pager *pMainPager; /* Pager for database being vacuumed */
Btree *pTemp; /* The temporary database we vacuum into */
char *zSql = 0; /* SQL statements */
int saved_flags; /* Saved value of the db->flags */
int saved_nChange; /* Saved value of db->nChange */
int saved_nTotalChange; /* Saved value of db->nTotalChange */
Db *pDb = 0; /* Database to detach at end of vacuum */
int isMemDb; /* True is vacuuming a :memory: database */
int nRes;
/* Save the current value of the write-schema flag before setting it. */
saved_flags = db->flags;
saved_nChange = db->nChange;
saved_nTotalChange = db->nTotalChange;
db->flags |= SQLITE_WriteSchema | SQLITE_IgnoreChecks;
if( !db->autoCommit ){
sqlite3SetString(pzErrMsg, db, "cannot VACUUM from within a transaction");
rc = SQLITE_ERROR;
goto end_of_vacuum;
}
pMain = db->aDb[0].pBt;
pMainPager = sqlite3BtreePager(pMain);
isMemDb = sqlite3PagerFile(pMainPager)->pMethods==0;
/* Attach the temporary database as 'vacuum_db'. The synchronous pragma
** can be set to 'off' for this file, as it is not recovered if a crash
** occurs anyway. The integrity of the database is maintained by a
** (possibly synchronous) transaction opened on the main database before
** sqlite3BtreeCopyFile() is called.
**
** An optimisation would be to use a non-journaled pager.
** (Later:) I tried setting "PRAGMA vacuum_db.journal_mode=OFF" but
** that actually made the VACUUM run slower. Very little journalling
** actually occurs when doing a vacuum since the vacuum_db is initially
** empty. Only the journal header is written. Apparently it takes more
** time to parse and run the PRAGMA to turn journalling off than it does
** to write the journal header file.
*/
zSql = "ATTACH '' AS vacuum_db;";
rc = execSql(db, zSql);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
pDb = &db->aDb[db->nDb-1];
assert( strcmp(db->aDb[db->nDb-1].zName,"vacuum_db")==0 );
pTemp = db->aDb[db->nDb-1].pBt;
nRes = sqlite3BtreeGetReserve(pMain);
/* A VACUUM cannot change the pagesize of an encrypted database. */
#ifdef SQLITE_HAS_CODEC
if( db->nextPagesize ){
extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*);
int nKey;
char *zKey;
sqlite3CodecGetKey(db, 0, (void**)&zKey, &nKey);
if( nKey ) db->nextPagesize = 0;
}
#endif
if( sqlite3BtreeSetPageSize(pTemp, sqlite3BtreeGetPageSize(pMain), nRes)
|| (!isMemDb && sqlite3BtreeSetPageSize(pTemp, db->nextPagesize, nRes))
|| db->mallocFailed
){
rc = SQLITE_NOMEM;
goto end_of_vacuum;
}
rc = execSql(db, "PRAGMA vacuum_db.synchronous=OFF");
if( rc!=SQLITE_OK ){
goto end_of_vacuum;
}
#ifndef SQLITE_OMIT_AUTOVACUUM
sqlite3BtreeSetAutoVacuum(pTemp, db->nextAutovac>=0 ? db->nextAutovac :
sqlite3BtreeGetAutoVacuum(pMain));
#endif
/* Begin a transaction */
rc = execSql(db, "BEGIN EXCLUSIVE;");
if( rc!=SQLITE_OK ) goto end_of_vacuum;
/* Query the schema of the main database. Create a mirror schema
** in the temporary database.
*/
rc = execExecSql(db,
"SELECT 'CREATE TABLE vacuum_db.' || substr(sql,14) "
" FROM sqlite_master WHERE type='table' AND name!='sqlite_sequence'"
" AND rootpage>0"
);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
rc = execExecSql(db,
"SELECT 'CREATE INDEX vacuum_db.' || substr(sql,14)"
" FROM sqlite_master WHERE sql LIKE 'CREATE INDEX %' ");
if( rc!=SQLITE_OK ) goto end_of_vacuum;
rc = execExecSql(db,
"SELECT 'CREATE UNIQUE INDEX vacuum_db.' || substr(sql,21) "
" FROM sqlite_master WHERE sql LIKE 'CREATE UNIQUE INDEX %'");
if( rc!=SQLITE_OK ) goto end_of_vacuum;
/* Loop through the tables in the main database. For each, do
** an "INSERT INTO vacuum_db.xxx SELECT * FROM xxx;" to copy
** the contents to the temporary database.
*/
rc = execExecSql(db,
"SELECT 'INSERT INTO vacuum_db.' || quote(name) "
"|| ' SELECT * FROM ' || quote(name) || ';'"
"FROM sqlite_master "
"WHERE type = 'table' AND name!='sqlite_sequence' "
" AND rootpage>0"
);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
/* Copy over the sequence table
*/
rc = execExecSql(db,
"SELECT 'DELETE FROM vacuum_db.' || quote(name) || ';' "
"FROM vacuum_db.sqlite_master WHERE name='sqlite_sequence' "
);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
rc = execExecSql(db,
"SELECT 'INSERT INTO vacuum_db.' || quote(name) "
"|| ' SELECT * FROM ' || quote(name) || ';' "
"FROM vacuum_db.sqlite_master WHERE name=='sqlite_sequence';"
);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
/* Copy the triggers, views, and virtual tables from the main database
** over to the temporary database. None of these objects has any
** associated storage, so all we have to do is copy their entries
** from the SQLITE_MASTER table.
*/
rc = execSql(db,
"INSERT INTO vacuum_db.sqlite_master "
" SELECT type, name, tbl_name, rootpage, sql"
" FROM sqlite_master"
" WHERE type='view' OR type='trigger'"
" OR (type='table' AND rootpage=0)"
);
if( rc ) goto end_of_vacuum;
/* At this point, unless the main db was completely empty, there is now a
** transaction open on the vacuum database, but not on the main database.
** Open a btree level transaction on the main database. This allows a
** call to sqlite3BtreeCopyFile(). The main database btree level
** transaction is then committed, so the SQL level never knows it was
** opened for writing. This way, the SQL transaction used to create the
** temporary database never needs to be committed.
*/
if( rc==SQLITE_OK ){
u32 meta;
int i;
/* This array determines which meta meta values are preserved in the
** vacuum. Even entries are the meta value number and odd entries
** are an increment to apply to the meta value after the vacuum.
** The increment is used to increase the schema cookie so that other
** connections to the same database will know to reread the schema.
*/
static const unsigned char aCopy[] = {
1, 1, /* Add one to the old schema cookie */
3, 0, /* Preserve the default page cache size */
5, 0, /* Preserve the default text encoding */
6, 0, /* Preserve the user version */
};
assert( 1==sqlite3BtreeIsInTrans(pTemp) );
assert( 1==sqlite3BtreeIsInTrans(pMain) );
/* Copy Btree meta values */
for(i=0; i<ArraySize(aCopy); i+=2){
rc = sqlite3BtreeGetMeta(pMain, aCopy[i], &meta);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
rc = sqlite3BtreeUpdateMeta(pTemp, aCopy[i], meta+aCopy[i+1]);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
}
rc = sqlite3BtreeCopyFile(pMain, pTemp);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
rc = sqlite3BtreeCommit(pTemp);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
#ifndef SQLITE_OMIT_AUTOVACUUM
sqlite3BtreeSetAutoVacuum(pMain, sqlite3BtreeGetAutoVacuum(pTemp));
#endif
rc = sqlite3BtreeCommit(pMain);
}
if( rc==SQLITE_OK ){
rc = sqlite3BtreeSetPageSize(pMain, sqlite3BtreeGetPageSize(pTemp), nRes);
}
end_of_vacuum:
/* Restore the original value of db->flags */
db->flags = saved_flags;
db->nChange = saved_nChange;
db->nTotalChange = saved_nTotalChange;
/* Currently there is an SQL level transaction open on the vacuum
** database. No locks are held on any other files (since the main file
** was committed at the btree level). So it safe to end the transaction
** by manually setting the autoCommit flag to true and detaching the
** vacuum database. The vacuum_db journal file is deleted when the pager
** is closed by the DETACH.
*/
db->autoCommit = 1;
if( pDb ){
sqlite3BtreeClose(pDb->pBt);
pDb->pBt = 0;
pDb->pSchema = 0;
}
sqlite3ResetInternalSchema(db, 0);
return rc;
}
/*
** An SQL user-function registered to do the work of an ATTACH statement. The
** three arguments to the function come directly from an attach statement:
**
** ATTACH DATABASE x AS y KEY z
**
** SELECT sqlite_attach(x, y, z)
**
** If the optional "KEY z" syntax is omitted, an SQL NULL is passed as the
** third argument.
*/
static void attachFunc(
sqlite3_context *context,
int NotUsed,
sqlite3_value **argv
){
int i;
int rc = 0;
sqlite3 *db = sqlite3_context_db_handle(context);
const char *zName;
const char *zFile;
Db *aNew;
char *zErrDyn = 0;
UNUSED_PARAMETER(NotUsed);
zFile = (const char *)sqlite3_value_text(argv[0]);
zName = (const char *)sqlite3_value_text(argv[1]);
if( zFile==0 ) zFile = "";
if( zName==0 ) zName = "";
/* Check for the following errors:
**
** * Too many attached databases,
** * Transaction currently open
** * Specified database name already being used.
*/
if( db->nDb>=db->aLimit[SQLITE_LIMIT_ATTACHED]+2 ){
zErrDyn = sqlite3MPrintf(db, "too many attached databases - max %d",
db->aLimit[SQLITE_LIMIT_ATTACHED]
);
goto attach_error;
}
if( !db->autoCommit ){
zErrDyn = sqlite3MPrintf(db, "cannot ATTACH database within transaction");
goto attach_error;
}
for(i=0; i<db->nDb; i++){
char *z = db->aDb[i].zName;
assert( z && zName );
if( sqlite3StrICmp(z, zName)==0 ){
zErrDyn = sqlite3MPrintf(db, "database %s is already in use", zName);
goto attach_error;
}
}
/* Allocate the new entry in the db->aDb[] array and initialise the schema
** hash tables.
*/
if( db->aDb==db->aDbStatic ){
aNew = sqlite3DbMallocRaw(db, sizeof(db->aDb[0])*3 );
if( aNew==0 ) return;
memcpy(aNew, db->aDb, sizeof(db->aDb[0])*2);
}else{
aNew = sqlite3DbRealloc(db, db->aDb, sizeof(db->aDb[0])*(db->nDb+1) );
if( aNew==0 ) return;
}
db->aDb = aNew;
aNew = &db->aDb[db->nDb];
memset(aNew, 0, sizeof(*aNew));
/* Open the database file. If the btree is successfully opened, use
** it to obtain the database schema. At this point the schema may
** or may not be initialised.
*/
rc = sqlite3BtreeOpen(zFile, db, &aNew->pBt, 0,
db->openFlags | SQLITE_OPEN_MAIN_DB);
db->nDb++;
if( rc==SQLITE_CONSTRAINT ){
rc = SQLITE_ERROR;
zErrDyn = sqlite3MPrintf(db, "database is already attached");
}else if( rc==SQLITE_OK ){
Pager *pPager;
aNew->pSchema = sqlite3SchemaGet(db, aNew->pBt);
if( !aNew->pSchema ){
rc = SQLITE_NOMEM;
}else if( aNew->pSchema->file_format && aNew->pSchema->enc!=ENC(db) ){
zErrDyn = sqlite3MPrintf(db,
"attached databases must use the same text encoding as main database");
rc = SQLITE_ERROR;
}
pPager = sqlite3BtreePager(aNew->pBt);
sqlite3PagerLockingMode(pPager, db->dfltLockMode);
sqlite3BtreeSecureDelete(aNew->pBt,
sqlite3BtreeSecureDelete(db->aDb[0].pBt,-1) );
}
aNew->safety_level = 3;
aNew->zName = sqlite3DbStrDup(db, zName);
if( rc==SQLITE_OK && aNew->zName==0 ){
rc = SQLITE_NOMEM;
}
#ifdef SQLITE_HAS_CODEC
if( rc==SQLITE_OK ){
extern int sqlite3CodecAttach(sqlite3*, int, const void*, int);
extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*);
int nKey;
char *zKey;
int t = sqlite3_value_type(argv[2]);
switch( t ){
case SQLITE_INTEGER:
case SQLITE_FLOAT:
zErrDyn = sqlite3DbStrDup(db, "Invalid key value");
rc = SQLITE_ERROR;
break;
case SQLITE_TEXT:
case SQLITE_BLOB:
nKey = sqlite3_value_bytes(argv[2]);
zKey = (char *)sqlite3_value_blob(argv[2]);
rc = sqlite3CodecAttach(db, db->nDb-1, zKey, nKey);
break;
case SQLITE_NULL:
/* No key specified. Use the key from the main database */
sqlite3CodecGetKey(db, 0, (void**)&zKey, &nKey);
if( nKey>0 || sqlite3BtreeGetReserve(db->aDb[0].pBt)>0 ){
rc = sqlite3CodecAttach(db, db->nDb-1, zKey, nKey);
}
break;
}
}
#endif
/* If the file was opened successfully, read the schema for the new database.
** If this fails, or if opening the file failed, then close the file and
** remove the entry from the db->aDb[] array. i.e. put everything back the way
** we found it.
*/
if( rc==SQLITE_OK ){
sqlite3BtreeEnterAll(db);
rc = sqlite3Init(db, &zErrDyn);
sqlite3BtreeLeaveAll(db);
}
if( rc ){
int iDb = db->nDb - 1;
assert( iDb>=2 );
if( db->aDb[iDb].pBt ){
sqlite3BtreeClose(db->aDb[iDb].pBt);
db->aDb[iDb].pBt = 0;
db->aDb[iDb].pSchema = 0;
}
sqlite3ResetInternalSchema(db, -1);
db->nDb = iDb;
if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){
db->mallocFailed = 1;
sqlite3DbFree(db, zErrDyn);
zErrDyn = sqlite3MPrintf(db, "out of memory");
}else if( zErrDyn==0 ){
zErrDyn = sqlite3MPrintf(db, "unable to open database: %s", zFile);
}
goto attach_error;
}
return;
attach_error:
/* Return an error if we get here */
if( zErrDyn ){
sqlite3_result_error(context, zErrDyn, -1);
sqlite3DbFree(db, zErrDyn);
}
if( rc ) sqlite3_result_error_code(context, rc);
}
static void attachFunc(
sqlite3_context *context,
int NotUsed,
sqlite3_value **argv
){
int i;
int rc = 0;
sqlite3 *db = sqlite3_context_db_handle(context);
const char *zName;
const char *zFile;
Db *aNew;
char *zErrDyn = 0;
UNUSED_PARAMETER(NotUsed);
zFile = (const char *)sqlite3_value_text(argv[0]);
zName = (const char *)sqlite3_value_text(argv[1]);
if( zFile==0 ) zFile = "";
if( zName==0 ) zName = "";
if( db->nDb>=db->aLimit[SQLITE_LIMIT_ATTACHED]+2 ){
zErrDyn = sqlite3MPrintf(db, "too many attached databases - max %d",
db->aLimit[SQLITE_LIMIT_ATTACHED]
);
goto attach_error;
}
if( !db->autoCommit ){
zErrDyn = sqlite3MPrintf(db, "cannot ATTACH database within transaction");
goto attach_error;
}
for(i=0; i<db->nDb; i++){
char *z = db->aDb[i].zName;
assert( z && zName );
if( sqlite3StrICmp(z, zName)==0 ){
zErrDyn = sqlite3MPrintf(db, "database %s is already in use", zName);
goto attach_error;
}
}
if( db->aDb==db->aDbStatic ){
aNew = sqlite3DbMallocRaw(db, sizeof(db->aDb[0])*3 );
if( aNew==0 ) return;
memcpy(aNew, db->aDb, sizeof(db->aDb[0])*2);
}else{
aNew = sqlite3DbRealloc(db, db->aDb, sizeof(db->aDb[0])*(db->nDb+1) );
if( aNew==0 ) return;
}
db->aDb = aNew;
aNew = &db->aDb[db->nDb];
memset(aNew, 0, sizeof(*aNew));
rc = sqlite3BtreeOpen(zFile, db, &aNew->pBt, 0,
db->openFlags | SQLITE_OPEN_MAIN_DB);
db->nDb++;
if( rc==SQLITE_CONSTRAINT ){
rc = SQLITE_ERROR;
zErrDyn = sqlite3MPrintf(db, "database is already attached");
}else if( rc==SQLITE_OK ){
Pager *pPager;
aNew->pSchema = sqlite3SchemaGet(db, aNew->pBt);
if( !aNew->pSchema ){
rc = SQLITE_NOMEM;
}else if( aNew->pSchema->file_format && aNew->pSchema->enc!=ENC(db) ){
zErrDyn = sqlite3MPrintf(db,
"attached databases must use the same text encoding as main database");
rc = SQLITE_ERROR;
}
pPager = sqlite3BtreePager(aNew->pBt);
sqlite3PagerLockingMode(pPager, db->dfltLockMode);
sqlite3BtreeSecureDelete(aNew->pBt,
sqlite3BtreeSecureDelete(db->aDb[0].pBt,-1) );
}
aNew->safety_level = 3;
aNew->zName = sqlite3DbStrDup(db, zName);
if( rc==SQLITE_OK && aNew->zName==0 ){
rc = SQLITE_NOMEM;
}
#ifdef SQLITE_HAS_CODEC
if( rc==SQLITE_OK ){
extern int sqlite3CodecAttach(sqlite3*, int, const void*, int);
extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*);
int nKey;
char *zKey;
int t = sqlite3_value_type(argv[2]);
switch( t ){
case SQLITE_INTEGER:
case SQLITE_FLOAT:
zErrDyn = sqlite3DbStrDup(db, "Invalid key value");
rc = SQLITE_ERROR;
break;
case SQLITE_TEXT:
case SQLITE_BLOB:
nKey = sqlite3_value_bytes(argv[2]);
zKey = (char *)sqlite3_value_blob(argv[2]);
rc = sqlite3CodecAttach(db, db->nDb-1, zKey, nKey);
break;
case SQLITE_NULL:
sqlite3CodecGetKey(db, 0, (void**)&zKey, &nKey);
if( nKey>0 || sqlite3BtreeGetReserve(db->aDb[0].pBt)>0 ){
rc = sqlite3CodecAttach(db, db->nDb-1, zKey, nKey);
}
break;
}
}
#endif
if( rc==SQLITE_OK ){
sqlite3BtreeEnterAll(db);
rc = sqlite3Init(db, &zErrDyn);
sqlite3BtreeLeaveAll(db);
}
if( rc ){
int iDb = db->nDb - 1;
assert( iDb>=2 );
if( db->aDb[iDb].pBt ){
sqlite3BtreeClose(db->aDb[iDb].pBt);
db->aDb[iDb].pBt = 0;
db->aDb[iDb].pSchema = 0;
}
sqlite3ResetInternalSchema(db, -1);
db->nDb = iDb;
if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){
db->mallocFailed = 1;
sqlite3DbFree(db, zErrDyn);
zErrDyn = sqlite3MPrintf(db, "out of memory");
}else if( zErrDyn==0 ){
zErrDyn = sqlite3MPrintf(db, "unable to open database: %s", zFile);
}
goto attach_error;
}
return;
attach_error:
if( zErrDyn ){
sqlite3_result_error(context, zErrDyn, -1);
sqlite3DbFree(db, zErrDyn);
}
if( rc ) sqlite3_result_error_code(context, rc);
}
/*
** This routine implements the OP_Vacuum opcode of the VDBE.
*/
int sqlite3RunVacuum(char **pzErrMsg, sqlite3 *db){
int rc = SQLITE_OK; /* Return code from service routines */
#if !defined(SQLITE_OMIT_VACUUM) || SQLITE_OMIT_VACUUM
const char *zFilename; /* full pathname of the database file */
int nFilename; /* number of characters in zFilename[] */
char *zTemp = 0; /* a temporary file in same directory as zFilename */
int i; /* Loop counter */
Btree *pMain; /* The database being vacuumed */
Btree *pTemp;
char *zSql = 0;
if( !db->autoCommit ){
sqlite3SetString(pzErrMsg, "cannot VACUUM from within a transaction",
(char*)0);
rc = SQLITE_ERROR;
goto end_of_vacuum;
}
/* Get the full pathname of the database file and create a
** temporary filename in the same directory as the original file.
*/
pMain = db->aDb[0].pBt;
zFilename = sqlite3BtreeGetFilename(pMain);
assert( zFilename );
if( zFilename[0]=='\0' ){
/* The in-memory database. Do nothing. Return directly to avoid causing
** an error trying to DETACH the vacuum_db (which never got attached)
** in the exit-handler.
*/
return SQLITE_OK;
}
nFilename = strlen(zFilename);
zTemp = sqliteMalloc( nFilename+100 );
if( zTemp==0 ){
rc = SQLITE_NOMEM;
goto end_of_vacuum;
}
strcpy(zTemp, zFilename);
i = 0;
do {
zTemp[nFilename] = '-';
randomName((unsigned char*)&zTemp[nFilename+1]);
} while( i<10 && sqlite3OsFileExists(zTemp) );
/* Attach the temporary database as 'vacuum_db'. The synchronous pragma
** can be set to 'off' for this file, as it is not recovered if a crash
** occurs anyway. The integrity of the database is maintained by a
** (possibly synchronous) transaction opened on the main database before
** sqlite3BtreeCopyFile() is called.
**
** An optimisation would be to use a non-journaled pager.
*/
zSql = sqlite3MPrintf("ATTACH '%q' AS vacuum_db;", zTemp);
if( !zSql ){
rc = SQLITE_NOMEM;
goto end_of_vacuum;
}
rc = execSql(db, zSql);
sqliteFree(zSql);
zSql = 0;
if( rc!=SQLITE_OK ) goto end_of_vacuum;
assert( strcmp(db->aDb[db->nDb-1].zName,"vacuum_db")==0 );
pTemp = db->aDb[db->nDb-1].pBt;
sqlite3BtreeSetPageSize(pTemp, sqlite3BtreeGetPageSize(pMain),
sqlite3BtreeGetReserve(pMain));
assert( sqlite3BtreeGetPageSize(pTemp)==sqlite3BtreeGetPageSize(pMain) );
execSql(db, "PRAGMA vacuum_db.synchronous=OFF");
/* Begin a transaction */
rc = execSql(db, "BEGIN;");
if( rc!=SQLITE_OK ) goto end_of_vacuum;
/* Query the schema of the main database. Create a mirror schema
** in the temporary database.
*/
rc = execExecSql(db,
"SELECT 'CREATE TABLE vacuum_db.' || substr(sql,14,100000000) "
" FROM sqlite_master WHERE type='table' "
"UNION ALL "
"SELECT 'CREATE INDEX vacuum_db.' || substr(sql,14,100000000) "
" FROM sqlite_master WHERE sql LIKE 'CREATE INDEX %' "
"UNION ALL "
"SELECT 'CREATE UNIQUE INDEX vacuum_db.' || substr(sql,21,100000000) "
" FROM sqlite_master WHERE sql LIKE 'CREATE UNIQUE INDEX %'"
"UNION ALL "
"SELECT 'CREATE VIEW vacuum_db.' || substr(sql,13,100000000) "
" FROM sqlite_master WHERE type='view'"
);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
/* Loop through the tables in the main database. For each, do
** an "INSERT INTO vacuum_db.xxx SELECT * FROM xxx;" to copy
** the contents to the temporary database.
*/
rc = execExecSql(db,
"SELECT 'INSERT INTO vacuum_db.' || quote(name) "
"|| ' SELECT * FROM ' || quote(name) || ';'"
"FROM sqlite_master "
"WHERE type = 'table';"
);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
/* Copy the triggers from the main database to the temporary database.
** This was deferred before in case the triggers interfered with copying
** the data. It's possible the indices should be deferred until this
** point also.
*/
rc = execExecSql(db,
"SELECT 'CREATE TRIGGER vacuum_db.' || substr(sql, 16, 1000000) "
"FROM sqlite_master WHERE type='trigger'"
);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
/* At this point, unless the main db was completely empty, there is now a
** transaction open on the vacuum database, but not on the main database.
** Open a btree level transaction on the main database. This allows a
** call to sqlite3BtreeCopyFile(). The main database btree level
** transaction is then committed, so the SQL level never knows it was
** opened for writing. This way, the SQL transaction used to create the
** temporary database never needs to be committed.
*/
if( sqlite3BtreeIsInTrans(pTemp) ){
u32 meta;
assert( 0==sqlite3BtreeIsInTrans(pMain) );
rc = sqlite3BtreeBeginTrans(pMain, 1);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
/* Copy Btree meta values 3 and 4. These correspond to SQL layer meta
** values 2 and 3, the default values of a couple of pragmas.
*/
rc = sqlite3BtreeGetMeta(pMain, 3, &meta);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
rc = sqlite3BtreeUpdateMeta(pTemp, 3, meta);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
rc = sqlite3BtreeGetMeta(pMain, 4, &meta);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
rc = sqlite3BtreeUpdateMeta(pTemp, 4, meta);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
rc = sqlite3BtreeCopyFile(pMain, pTemp);
if( rc!=SQLITE_OK ) goto end_of_vacuum;
rc = sqlite3BtreeCommit(pMain);
}
end_of_vacuum:
/* Currently there is an SQL level transaction open on the vacuum
** database. No locks are held on any other files (since the main file
** was committed at the btree level). So it safe to end the transaction
** by manually setting the autoCommit flag to true and detaching the
** vacuum database. The vacuum_db journal file is deleted when the pager
** is closed by the DETACH.
*/
db->autoCommit = 1;
if( rc==SQLITE_OK ){
rc = execSql(db, "DETACH vacuum_db;");
}else{
execSql(db, "DETACH vacuum_db;");
}
if( zTemp ){
sqlite3OsDelete(zTemp);
sqliteFree(zTemp);
}
if( zSql ) sqliteFree( zSql );
sqlite3ResetInternalSchema(db, 0);
#endif
return rc;
}
/*
** Parameter zSrcData points to a buffer containing the data for
** page iSrcPg from the source database. Copy this data into the
** destination database.
*/
static int backupOnePage(sqlite3_backup *p, Pgno iSrcPg, const u8 *zSrcData) {
Pager * const pDestPager = sqlite3BtreePager(p->pDest);
const int nSrcPgsz = sqlite3BtreeGetPageSize(p->pSrc);
int nDestPgsz = sqlite3BtreeGetPageSize(p->pDest);
const int nCopy = MIN(nSrcPgsz, nDestPgsz);
const i64 iEnd = (i64)iSrcPg*(i64)nSrcPgsz;
#ifdef SQLITE_HAS_CODEC
/* Use BtreeGetReserveNoMutex() for the source b-tree, as although it is
** guaranteed that the shared-mutex is held by this thread, handle
** p->pSrc may not actually be the owner. */
int nSrcReserve = sqlite3BtreeGetReserveNoMutex(p->pSrc);
int nDestReserve = sqlite3BtreeGetReserve(p->pDest);
#endif
int rc = SQLITE_OK;
i64 iOff;
assert( sqlite3BtreeGetReserveNoMutex(p->pSrc)>=0 );
assert( p->bDestLocked );
assert( !isFatalError(p->rc) );
assert( iSrcPg!=PENDING_BYTE_PAGE(p->pSrc->pBt) );
assert( zSrcData );
/* Catch the case where the destination is an in-memory database and the
** page sizes of the source and destination differ.
*/
if( nSrcPgsz!=nDestPgsz && sqlite3PagerIsMemdb(pDestPager) ) {
rc = SQLITE_READONLY;
}
#ifdef SQLITE_HAS_CODEC
/* Backup is not possible if the page size of the destination is changing
** and a codec is in use.
*/
if( nSrcPgsz!=nDestPgsz && sqlite3PagerGetCodec(pDestPager)!=0 ) {
rc = SQLITE_READONLY;
}
/* Backup is not possible if the number of bytes of reserve space differ
** between source and destination. If there is a difference, try to
** fix the destination to agree with the source. If that is not possible,
** then the backup cannot proceed.
*/
if( nSrcReserve!=nDestReserve ) {
u32 newPgsz = nSrcPgsz;
rc = sqlite3PagerSetPagesize(pDestPager, &newPgsz, nSrcReserve);
if( rc==SQLITE_OK && newPgsz!=nSrcPgsz ) rc = SQLITE_READONLY;
}
#endif
/* This loop runs once for each destination page spanned by the source
** page. For each iteration, variable iOff is set to the byte offset
** of the destination page.
*/
for(iOff=iEnd-(i64)nSrcPgsz; rc==SQLITE_OK && iOff<iEnd; iOff+=nDestPgsz) {
DbPage *pDestPg = 0;
Pgno iDest = (Pgno)(iOff/nDestPgsz)+1;
if( iDest==PENDING_BYTE_PAGE(p->pDest->pBt) ) continue;
if( SQLITE_OK==(rc = sqlite3PagerGet(pDestPager, iDest, &pDestPg))
&& SQLITE_OK==(rc = sqlite3PagerWrite(pDestPg))
) {
const u8 *zIn = &zSrcData[iOff%nSrcPgsz];
u8 *zDestData = sqlite3PagerGetData(pDestPg);
u8 *zOut = &zDestData[iOff%nDestPgsz];
/* Copy the data from the source page into the destination page.
** Then clear the Btree layer MemPage.isInit flag. Both this module
** and the pager code use this trick (clearing the first byte
** of the page 'extra' space to invalidate the Btree layers
** cached parse of the page). MemPage.isInit is marked
** "MUST BE FIRST" for this purpose.
*/
memcpy(zOut, zIn, nCopy);
((u8 *)sqlite3PagerGetExtra(pDestPg))[0] = 0;
}
sqlite3PagerUnref(pDestPg);
}
return rc;
}
/*
** Process a pragma statement.
**
** Pragmas are of this form:
**
** PRAGMA [database.]id [= value]
**
** The identifier might also be a string. The value is a string, and
** identifier, or a number. If minusFlag is true, then the value is
** a number that was preceded by a minus sign.
**
** If the left side is "database.id" then pId1 is the database name
** and pId2 is the id. If the left side is just "id" then pId1 is the
** id and pId2 is any empty string.
*/
void sqlite3Pragma(
Parse *pParse,
Token *pId1, /* First part of [database.]id field */
Token *pId2, /* Second part of [database.]id field, or NULL */
Token *pValue, /* Token for <value>, or NULL */
int minusFlag /* True if a '-' sign preceded <value> */
){
char *zLeft = 0; /* Nul-terminated UTF-8 string <id> */
char *zRight = 0; /* Nul-terminated UTF-8 string <value>, or NULL */
const char *zDb = 0; /* The database name */
Token *pId; /* Pointer to <id> token */
int iDb; /* Database index for <database> */
sqlite3 *db = pParse->db;
Db *pDb;
Vdbe *v = sqlite3GetVdbe(pParse);
if( v==0 ) return;
/* Interpret the [database.] part of the pragma statement. iDb is the
** index of the database this pragma is being applied to in db.aDb[]. */
iDb = sqlite3TwoPartName(pParse, pId1, pId2, &pId);
if( iDb<0 ) return;
pDb = &db->aDb[iDb];
zLeft = sqlite3NameFromToken(pId);
if( !zLeft ) return;
if( minusFlag ){
zRight = sqlite3MPrintf("-%T", pValue);
}else{
zRight = sqlite3NameFromToken(pValue);
}
zDb = ((iDb>0)?pDb->zName:0);
if( sqlite3AuthCheck(pParse, SQLITE_PRAGMA, zLeft, zRight, zDb) ){
goto pragma_out;
}
/*
** PRAGMA [database.]default_cache_size
** PRAGMA [database.]default_cache_size=N
**
** The first form reports the current persistent setting for the
** page cache size. The value returned is the maximum number of
** pages in the page cache. The second form sets both the current
** page cache size value and the persistent page cache size value
** stored in the database file.
**
** The default cache size is stored in meta-value 2 of page 1 of the
** database file. The cache size is actually the absolute value of
** this memory location. The sign of meta-value 2 determines the
** synchronous setting. A negative value means synchronous is off
** and a positive value means synchronous is on.
*/
if( sqlite3StrICmp(zLeft,"default_cache_size")==0 ){
static const VdbeOpList getCacheSize[] = {
{ OP_ReadCookie, 0, 2, 0}, /* 0 */
{ OP_AbsValue, 0, 0, 0},
{ OP_Dup, 0, 0, 0},
{ OP_Integer, 0, 0, 0},
{ OP_Ne, 0, 6, 0},
{ OP_Integer, 0, 0, 0}, /* 5 */
{ OP_Callback, 1, 0, 0},
};
int addr;
if( sqlite3ReadSchema(pParse) ) goto pragma_out;
if( !zRight ){
sqlite3VdbeSetNumCols(v, 1);
sqlite3VdbeSetColName(v, 0, "cache_size", P3_STATIC);
addr = sqlite3VdbeAddOpList(v, ArraySize(getCacheSize), getCacheSize);
sqlite3VdbeChangeP1(v, addr, iDb);
sqlite3VdbeChangeP1(v, addr+5, MAX_PAGES);
}else{
int size = atoi(zRight);
if( size<0 ) size = -size;
sqlite3BeginWriteOperation(pParse, 0, iDb);
sqlite3VdbeAddOp(v, OP_Integer, size, 0);
sqlite3VdbeAddOp(v, OP_ReadCookie, iDb, 2);
addr = sqlite3VdbeAddOp(v, OP_Integer, 0, 0);
sqlite3VdbeAddOp(v, OP_Ge, 0, addr+3);
sqlite3VdbeAddOp(v, OP_Negative, 0, 0);
sqlite3VdbeAddOp(v, OP_SetCookie, iDb, 2);
pDb->cache_size = size;
sqlite3BtreeSetCacheSize(pDb->pBt, pDb->cache_size);
}
}else
/*
** PRAGMA [database.]page_size
** PRAGMA [database.]page_size=N
**
** The first form reports the current setting for the
** database page size in bytes. The second form sets the
** database page size value. The value can only be set if
** the database has not yet been created.
*/
if( sqlite3StrICmp(zLeft,"page_size")==0 ){
Btree *pBt = pDb->pBt;
if( !zRight ){
int size = pBt ? sqlite3BtreeGetPageSize(pBt) : 0;
returnSingleInt(pParse, "page_size", size);
}else{
sqlite3BtreeSetPageSize(pBt, atoi(zRight), sqlite3BtreeGetReserve(pBt));
}
}else
/*
** PRAGMA [database.]cache_size
** PRAGMA [database.]cache_size=N
**
** The first form reports the current local setting for the
** page cache size. The local setting can be different from
** the persistent cache size value that is stored in the database
** file itself. The value returned is the maximum number of
** pages in the page cache. The second form sets the local
** page cache size value. It does not change the persistent
** cache size stored on the disk so the cache size will revert
** to its default value when the database is closed and reopened.
** N should be a positive integer.
*/
if( sqlite3StrICmp(zLeft,"cache_size")==0 ){
if( sqlite3ReadSchema(pParse) ) goto pragma_out;
if( !zRight ){
returnSingleInt(pParse, "cache_size", pDb->cache_size);
}else{
int size = atoi(zRight);
if( size<0 ) size = -size;
pDb->cache_size = size;
sqlite3BtreeSetCacheSize(pDb->pBt, pDb->cache_size);
}
}else
/*
** PRAGMA temp_store
** PRAGMA temp_store = "default"|"memory"|"file"
**
** Return or set the local value of the temp_store flag. Changing
** the local value does not make changes to the disk file and the default
** value will be restored the next time the database is opened.
**
** Note that it is possible for the library compile-time options to
** override this setting
*/
if( sqlite3StrICmp(zLeft, "temp_store")==0 ){
if( !zRight ){
returnSingleInt(pParse, "temp_store", db->temp_store);
}else{
changeTempStorage(pParse, zRight);
}
}else
/*
** PRAGMA [database.]synchronous
** PRAGMA [database.]synchronous=OFF|ON|NORMAL|FULL
**
** Return or set the local value of the synchronous flag. Changing
** the local value does not make changes to the disk file and the
** default value will be restored the next time the database is
** opened.
*/
if( sqlite3StrICmp(zLeft,"synchronous")==0 ){
if( sqlite3ReadSchema(pParse) ) goto pragma_out;
if( !zRight ){
returnSingleInt(pParse, "synchronous", pDb->safety_level-1);
}else{
if( !db->autoCommit ){
sqlite3ErrorMsg(pParse,
"Safety level may not be changed inside a transaction");
}else{
pDb->safety_level = getSafetyLevel(zRight)+1;
sqlite3BtreeSetSafetyLevel(pDb->pBt, pDb->safety_level);
}
}
}else
#if 0 /* Used once during development. No longer needed */
if( sqlite3StrICmp(zLeft, "trigger_overhead_test")==0 ){
if( getBoolean(zRight) ){
sqlite3_always_code_trigger_setup = 1;
}else{
sqlite3_always_code_trigger_setup = 0;
}
}else
#endif
if( flagPragma(pParse, zLeft, zRight) ){
/* The flagPragma() subroutine also generates any necessary code
** there is nothing more to do here */
}else
/*
** PRAGMA table_info(<table>)
**
** Return a single row for each column of the named table. The columns of
** the returned data set are:
**
** cid: Column id (numbered from left to right, starting at 0)
** name: Column name
** type: Column declaration type.
** notnull: True if 'NOT NULL' is part of column declaration
** dflt_value: The default value for the column, if any.
*/
if( sqlite3StrICmp(zLeft, "table_info")==0 && zRight ){
Table *pTab;
if( sqlite3ReadSchema(pParse) ) goto pragma_out;
pTab = sqlite3FindTable(db, zRight, zDb);
if( pTab ){
int i;
sqlite3VdbeSetNumCols(v, 6);
sqlite3VdbeSetColName(v, 0, "cid", P3_STATIC);
sqlite3VdbeSetColName(v, 1, "name", P3_STATIC);
sqlite3VdbeSetColName(v, 2, "type", P3_STATIC);
sqlite3VdbeSetColName(v, 3, "notnull", P3_STATIC);
sqlite3VdbeSetColName(v, 4, "dflt_value", P3_STATIC);
sqlite3VdbeSetColName(v, 5, "pk", P3_STATIC);
sqlite3ViewGetColumnNames(pParse, pTab);
for(i=0; i<pTab->nCol; i++){
sqlite3VdbeAddOp(v, OP_Integer, i, 0);
sqlite3VdbeOp3(v, OP_String8, 0, 0, pTab->aCol[i].zName, 0);
sqlite3VdbeOp3(v, OP_String8, 0, 0,
pTab->aCol[i].zType ? pTab->aCol[i].zType : "numeric", 0);
sqlite3VdbeAddOp(v, OP_Integer, pTab->aCol[i].notNull, 0);
sqlite3VdbeOp3(v, OP_String8, 0, 0,
pTab->aCol[i].zDflt, P3_STATIC);
sqlite3VdbeAddOp(v, OP_Integer, pTab->aCol[i].isPrimKey, 0);
sqlite3VdbeAddOp(v, OP_Callback, 6, 0);
}
}
}else
if( sqlite3StrICmp(zLeft, "index_info")==0 && zRight ){
Index *pIdx;
Table *pTab;
if( sqlite3ReadSchema(pParse) ) goto pragma_out;
pIdx = sqlite3FindIndex(db, zRight, zDb);
if( pIdx ){
int i;
pTab = pIdx->pTable;
sqlite3VdbeSetNumCols(v, 3);
sqlite3VdbeSetColName(v, 0, "seqno", P3_STATIC);
sqlite3VdbeSetColName(v, 1, "cid", P3_STATIC);
sqlite3VdbeSetColName(v, 2, "name", P3_STATIC);
for(i=0; i<pIdx->nColumn; i++){
int cnum = pIdx->aiColumn[i];
sqlite3VdbeAddOp(v, OP_Integer, i, 0);
sqlite3VdbeAddOp(v, OP_Integer, cnum, 0);
assert( pTab->nCol>cnum );
sqlite3VdbeOp3(v, OP_String8, 0, 0, pTab->aCol[cnum].zName, 0);
sqlite3VdbeAddOp(v, OP_Callback, 3, 0);
}
}
}else
if( sqlite3StrICmp(zLeft, "index_list")==0 && zRight ){
Index *pIdx;
Table *pTab;
if( sqlite3ReadSchema(pParse) ) goto pragma_out;
pTab = sqlite3FindTable(db, zRight, zDb);
if( pTab ){
v = sqlite3GetVdbe(pParse);
pIdx = pTab->pIndex;
if( pIdx ){
int i = 0;
sqlite3VdbeSetNumCols(v, 3);
sqlite3VdbeSetColName(v, 0, "seq", P3_STATIC);
sqlite3VdbeSetColName(v, 1, "name", P3_STATIC);
sqlite3VdbeSetColName(v, 2, "unique", P3_STATIC);
while(pIdx){
sqlite3VdbeAddOp(v, OP_Integer, i, 0);
sqlite3VdbeOp3(v, OP_String8, 0, 0, pIdx->zName, 0);
sqlite3VdbeAddOp(v, OP_Integer, pIdx->onError!=OE_None, 0);
sqlite3VdbeAddOp(v, OP_Callback, 3, 0);
++i;
pIdx = pIdx->pNext;
}
}
}
}else
if( sqlite3StrICmp(zLeft, "foreign_key_list")==0 && zRight ){
FKey *pFK;
Table *pTab;
if( sqlite3ReadSchema(pParse) ) goto pragma_out;
pTab = sqlite3FindTable(db, zRight, zDb);
if( pTab ){
v = sqlite3GetVdbe(pParse);
pFK = pTab->pFKey;
if( pFK ){
int i = 0;
sqlite3VdbeSetNumCols(v, 5);
sqlite3VdbeSetColName(v, 0, "id", P3_STATIC);
sqlite3VdbeSetColName(v, 1, "seq", P3_STATIC);
sqlite3VdbeSetColName(v, 2, "table", P3_STATIC);
sqlite3VdbeSetColName(v, 3, "from", P3_STATIC);
sqlite3VdbeSetColName(v, 4, "to", P3_STATIC);
while(pFK){
int j;
for(j=0; j<pFK->nCol; j++){
sqlite3VdbeAddOp(v, OP_Integer, i, 0);
sqlite3VdbeAddOp(v, OP_Integer, j, 0);
sqlite3VdbeOp3(v, OP_String8, 0, 0, pFK->zTo, 0);
sqlite3VdbeOp3(v, OP_String8, 0, 0,
pTab->aCol[pFK->aCol[j].iFrom].zName, 0);
sqlite3VdbeOp3(v, OP_String8, 0, 0, pFK->aCol[j].zCol, 0);
sqlite3VdbeAddOp(v, OP_Callback, 5, 0);
}
++i;
pFK = pFK->pNextFrom;
}
}
}
}else
if( sqlite3StrICmp(zLeft, "database_list")==0 ){
int i;
if( sqlite3ReadSchema(pParse) ) goto pragma_out;
sqlite3VdbeSetNumCols(v, 3);
sqlite3VdbeSetColName(v, 0, "seq", P3_STATIC);
sqlite3VdbeSetColName(v, 1, "name", P3_STATIC);
sqlite3VdbeSetColName(v, 2, "file", P3_STATIC);
for(i=0; i<db->nDb; i++){
if( db->aDb[i].pBt==0 ) continue;
assert( db->aDb[i].zName!=0 );
sqlite3VdbeAddOp(v, OP_Integer, i, 0);
sqlite3VdbeOp3(v, OP_String8, 0, 0, db->aDb[i].zName, 0);
sqlite3VdbeOp3(v, OP_String8, 0, 0,
sqlite3BtreeGetFilename(db->aDb[i].pBt), 0);
sqlite3VdbeAddOp(v, OP_Callback, 3, 0);
}
}else
#ifndef NDEBUG
if( sqlite3StrICmp(zLeft, "parser_trace")==0 ){
extern void sqlite3ParserTrace(FILE*, char *);
if( getBoolean(zRight) ){
sqlite3ParserTrace(stdout, "parser: ");
}else{
sqlite3ParserTrace(0, 0);
}
}else
#endif
if( sqlite3StrICmp(zLeft, "integrity_check")==0 ){
int i, j, addr;
/* Code that initializes the integrity check program. Set the
** error count 0
*/
static const VdbeOpList initCode[] = {
{ OP_Integer, 0, 0, 0},
{ OP_MemStore, 0, 1, 0},
};
/* Code that appears at the end of the integrity check. If no error
** messages have been generated, output OK. Otherwise output the
** error message
*/
static const VdbeOpList endCode[] = {
{ OP_MemLoad, 0, 0, 0},
{ OP_Integer, 0, 0, 0},
{ OP_Ne, 0, 0, 0}, /* 2 */
{ OP_String8, 0, 0, "ok"},
{ OP_Callback, 1, 0, 0},
};
/* Initialize the VDBE program */
if( sqlite3ReadSchema(pParse) ) goto pragma_out;
sqlite3VdbeSetNumCols(v, 1);
sqlite3VdbeSetColName(v, 0, "integrity_check", P3_STATIC);
sqlite3VdbeAddOpList(v, ArraySize(initCode), initCode);
/* Do an integrity check on each database file */
for(i=0; i<db->nDb; i++){
HashElem *x;
int cnt = 0;
sqlite3CodeVerifySchema(pParse, i);
/* Do an integrity check of the B-Tree
*/
for(x=sqliteHashFirst(&db->aDb[i].tblHash); x; x=sqliteHashNext(x)){
Table *pTab = sqliteHashData(x);
Index *pIdx;
sqlite3VdbeAddOp(v, OP_Integer, pTab->tnum, 0);
cnt++;
for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
if( sqlite3CheckIndexCollSeq(pParse, pIdx) ) goto pragma_out;
sqlite3VdbeAddOp(v, OP_Integer, pIdx->tnum, 0);
cnt++;
}
}
assert( cnt>0 );
sqlite3VdbeAddOp(v, OP_IntegrityCk, cnt, i);
sqlite3VdbeAddOp(v, OP_Dup, 0, 1);
addr = sqlite3VdbeOp3(v, OP_String8, 0, 0, "ok", P3_STATIC);
sqlite3VdbeAddOp(v, OP_Eq, 0, addr+6);
sqlite3VdbeOp3(v, OP_String8, 0, 0,
sqlite3MPrintf("*** in database %s ***\n", db->aDb[i].zName),
P3_DYNAMIC);
sqlite3VdbeAddOp(v, OP_Pull, 1, 0);
sqlite3VdbeAddOp(v, OP_Concat, 0, 1);
sqlite3VdbeAddOp(v, OP_Callback, 1, 0);
/* Make sure all the indices are constructed correctly.
*/
sqlite3CodeVerifySchema(pParse, i);
for(x=sqliteHashFirst(&db->aDb[i].tblHash); x; x=sqliteHashNext(x)){
Table *pTab = sqliteHashData(x);
Index *pIdx;
int loopTop;
if( pTab->pIndex==0 ) continue;
sqlite3OpenTableAndIndices(pParse, pTab, 1, OP_OpenRead);
sqlite3VdbeAddOp(v, OP_Integer, 0, 0);
sqlite3VdbeAddOp(v, OP_MemStore, 1, 1);
loopTop = sqlite3VdbeAddOp(v, OP_Rewind, 1, 0);
sqlite3VdbeAddOp(v, OP_MemIncr, 1, 0);
for(j=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, j++){
int jmp2;
static const VdbeOpList idxErr[] = {
{ OP_MemIncr, 0, 0, 0},
{ OP_String8, 0, 0, "rowid "},
{ OP_Recno, 1, 0, 0},
{ OP_String8, 0, 0, " missing from index "},
{ OP_String8, 0, 0, 0}, /* 4 */
{ OP_Concat, 2, 0, 0},
{ OP_Callback, 1, 0, 0},
};
sqlite3GenerateIndexKey(v, pIdx, 1);
jmp2 = sqlite3VdbeAddOp(v, OP_Found, j+2, 0);
addr = sqlite3VdbeAddOpList(v, ArraySize(idxErr), idxErr);
sqlite3VdbeChangeP3(v, addr+4, pIdx->zName, P3_STATIC);
sqlite3VdbeChangeP2(v, jmp2, sqlite3VdbeCurrentAddr(v));
}
sqlite3VdbeAddOp(v, OP_Next, 1, loopTop+1);
sqlite3VdbeChangeP2(v, loopTop, sqlite3VdbeCurrentAddr(v));
for(j=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, j++){
static const VdbeOpList cntIdx[] = {
{ OP_Integer, 0, 0, 0},
{ OP_MemStore, 2, 1, 0},
{ OP_Rewind, 0, 0, 0}, /* 2 */
{ OP_MemIncr, 2, 0, 0},
{ OP_Next, 0, 0, 0}, /* 4 */
{ OP_MemLoad, 1, 0, 0},
{ OP_MemLoad, 2, 0, 0},
{ OP_Eq, 0, 0, 0}, /* 7 */
{ OP_MemIncr, 0, 0, 0},
{ OP_String8, 0, 0, "wrong # of entries in index "},
{ OP_String8, 0, 0, 0}, /* 10 */
{ OP_Concat, 0, 0, 0},
{ OP_Callback, 1, 0, 0},
};
if( pIdx->tnum==0 ) continue;
addr = sqlite3VdbeAddOpList(v, ArraySize(cntIdx), cntIdx);
sqlite3VdbeChangeP1(v, addr+2, j+2);
sqlite3VdbeChangeP2(v, addr+2, addr+5);
sqlite3VdbeChangeP1(v, addr+4, j+2);
sqlite3VdbeChangeP2(v, addr+4, addr+3);
sqlite3VdbeChangeP2(v, addr+7, addr+ArraySize(cntIdx));
sqlite3VdbeChangeP3(v, addr+10, pIdx->zName, P3_STATIC);
}
}
}
addr = sqlite3VdbeAddOpList(v, ArraySize(endCode), endCode);
sqlite3VdbeChangeP2(v, addr+2, addr+ArraySize(endCode));
}else
/*
** PRAGMA encoding
** PRAGMA encoding = "utf-8"|"utf-16"|"utf-16le"|"utf-16be"
**
** In it's first form, this pragma returns the encoding of the main
** database. If the database is not initialized, it is initialized now.
**
** The second form of this pragma is a no-op if the main database file
** has not already been initialized. In this case it sets the default
** encoding that will be used for the main database file if a new file
** is created. If an existing main database file is opened, then the
** default text encoding for the existing database is used.
**
** In all cases new databases created using the ATTACH command are
** created to use the same default text encoding as the main database. If
** the main database has not been initialized and/or created when ATTACH
** is executed, this is done before the ATTACH operation.
**
** In the second form this pragma sets the text encoding to be used in
** new database files created using this database handle. It is only
** useful if invoked immediately after the main database i
*/
if( sqlite3StrICmp(zLeft, "encoding")==0 ){
static struct EncName {
char *zName;
u8 enc;
} encnames[] = {
{ "UTF-8", SQLITE_UTF8 },
{ "UTF8", SQLITE_UTF8 },
{ "UTF-16le", SQLITE_UTF16LE },
{ "UTF16le", SQLITE_UTF16LE },
{ "UTF-16be", SQLITE_UTF16BE },
{ "UTF16be", SQLITE_UTF16BE },
{ "UTF-16", 0 /* Filled in at run-time */ },
{ "UTF16", 0 /* Filled in at run-time */ },
{ 0, 0 }
};
struct EncName *pEnc;
encnames[6].enc = encnames[7].enc = SQLITE_UTF16NATIVE;
if( !zRight ){ /* "PRAGMA encoding" */
if( sqlite3ReadSchema(pParse) ) goto pragma_out;
sqlite3VdbeSetNumCols(v, 1);
sqlite3VdbeSetColName(v, 0, "encoding", P3_STATIC);
sqlite3VdbeAddOp(v, OP_String8, 0, 0);
for(pEnc=&encnames[0]; pEnc->zName; pEnc++){
if( pEnc->enc==pParse->db->enc ){
sqlite3VdbeChangeP3(v, -1, pEnc->zName, P3_STATIC);
break;
}
}
sqlite3VdbeAddOp(v, OP_Callback, 1, 0);
}else{ /* "PRAGMA encoding = XXX" */
/* Only change the value of sqlite.enc if the database handle is not
** initialized. If the main database exists, the new sqlite.enc value
** will be overwritten when the schema is next loaded. If it does not
** already exists, it will be created to use the new encoding value.
*/
if( !(pParse->db->flags&SQLITE_Initialized) ){
for(pEnc=&encnames[0]; pEnc->zName; pEnc++){
if( 0==sqlite3StrICmp(zRight, pEnc->zName) ){
pParse->db->enc = pEnc->enc;
break;
}
}
if( !pEnc->zName ){
sqlite3ErrorMsg(pParse, "unsupported encoding: %s", zRight);
}
}
}
}else
#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
/*
** Report the current state of file logs for all databases
*/
if( sqlite3StrICmp(zLeft, "lock_status")==0 ){
static const char *const azLockName[] = {
"unlocked", "shared", "reserved", "pending", "exclusive"
};
int i;
Vdbe *v = sqlite3GetVdbe(pParse);
sqlite3VdbeSetNumCols(v, 2);
sqlite3VdbeSetColName(v, 0, "database", P3_STATIC);
sqlite3VdbeSetColName(v, 1, "status", P3_STATIC);
for(i=0; i<db->nDb; i++){
Btree *pBt;
Pager *pPager;
if( db->aDb[i].zName==0 ) continue;
sqlite3VdbeOp3(v, OP_String, 0, 0, db->aDb[i].zName, P3_STATIC);
pBt = db->aDb[i].pBt;
if( pBt==0 || (pPager = sqlite3BtreePager(pBt))==0 ){
sqlite3VdbeOp3(v, OP_String, 0, 0, "closed", P3_STATIC);
}else{
int j = sqlite3pager_lockstate(pPager);
sqlite3VdbeOp3(v, OP_String, 0, 0,
(j>=0 && j<=4) ? azLockName[j] : "unknown", P3_STATIC);
}
sqlite3VdbeAddOp(v, OP_Callback, 2, 0);
}
}else
#endif
{}
pragma_out:
sqliteFree(zLeft);
sqliteFree(zRight);
}
/*
** Move a statvfs cursor to the next entry in the file.
*/
static int statNext(sqlite3_vtab_cursor *pCursor){
int rc;
int nPayload;
StatCursor *pCsr = (StatCursor *)pCursor;
StatTable *pTab = (StatTable *)pCursor->pVtab;
Btree *pBt = pTab->db->aDb[0].pBt;
Pager *pPager = sqlite3BtreePager(pBt);
sqlite3_free(pCsr->zPath);
pCsr->zPath = 0;
if( pCsr->aPage[0].pPg==0 ){
rc = sqlite3_step(pCsr->pStmt);
if( rc==SQLITE_ROW ){
int nPage;
u32 iRoot = (u32)sqlite3_column_int64(pCsr->pStmt, 1);
sqlite3PagerPagecount(pPager, &nPage);
if( nPage==0 ){
pCsr->isEof = 1;
return sqlite3_reset(pCsr->pStmt);
}
rc = sqlite3PagerGet(pPager, iRoot, &pCsr->aPage[0].pPg);
pCsr->aPage[0].iPgno = iRoot;
pCsr->aPage[0].iCell = 0;
pCsr->aPage[0].zPath = sqlite3_mprintf("/");
pCsr->iPage = 0;
}else{
pCsr->isEof = 1;
return sqlite3_reset(pCsr->pStmt);
}
}else{
/* Page p itself has already been visited. */
StatPage *p = &pCsr->aPage[pCsr->iPage];
while( p->iCell<p->nCell ){
StatCell *pCell = &p->aCell[p->iCell];
if( pCell->iOvfl<pCell->nOvfl ){
int nUsable = sqlite3BtreeGetPageSize(pBt)-sqlite3BtreeGetReserve(pBt);
pCsr->zName = (char *)sqlite3_column_text(pCsr->pStmt, 0);
pCsr->iPageno = pCell->aOvfl[pCell->iOvfl];
pCsr->zPagetype = "overflow";
pCsr->nCell = 0;
pCsr->nMxPayload = 0;
pCsr->zPath = sqlite3_mprintf(
"%s%.3x+%.6x", p->zPath, p->iCell, pCell->iOvfl
);
if( pCell->iOvfl<pCell->nOvfl-1 ){
pCsr->nUnused = 0;
pCsr->nPayload = nUsable - 4;
}else{
pCsr->nPayload = pCell->nLastOvfl;
pCsr->nUnused = nUsable - 4 - pCsr->nPayload;
}
pCell->iOvfl++;
statSizeAndOffset(pCsr);
return SQLITE_OK;
}
if( p->iRightChildPg ) break;
p->iCell++;
}
while( !p->iRightChildPg || p->iCell>p->nCell ){
statClearPage(p);
if( pCsr->iPage==0 ) return statNext(pCursor);
pCsr->iPage--;
p = &pCsr->aPage[pCsr->iPage];
}
pCsr->iPage++;
assert( p==&pCsr->aPage[pCsr->iPage-1] );
if( p->iCell==p->nCell ){
p[1].iPgno = p->iRightChildPg;
}else{
p[1].iPgno = p->aCell[p->iCell].iChildPg;
}
rc = sqlite3PagerGet(pPager, p[1].iPgno, &p[1].pPg);
p[1].iCell = 0;
p[1].zPath = sqlite3_mprintf("%s%.3x/", p->zPath, p->iCell);
p->iCell++;
}
/* Populate the StatCursor fields with the values to be returned
** by the xColumn() and xRowid() methods.
*/
if( rc==SQLITE_OK ){
int i;
StatPage *p = &pCsr->aPage[pCsr->iPage];
pCsr->zName = (char *)sqlite3_column_text(pCsr->pStmt, 0);
pCsr->iPageno = p->iPgno;
statDecodePage(pBt, p);
statSizeAndOffset(pCsr);
switch( p->flags ){
case 0x05: /* table internal */
case 0x02: /* index internal */
pCsr->zPagetype = "internal";
break;
case 0x0D: /* table leaf */
case 0x0A: /* index leaf */
pCsr->zPagetype = "leaf";
break;
default:
pCsr->zPagetype = "corrupted";
break;
}
pCsr->nCell = p->nCell;
pCsr->nUnused = p->nUnused;
pCsr->nMxPayload = p->nMxPayload;
pCsr->zPath = sqlite3_mprintf("%s", p->zPath);
nPayload = 0;
for(i=0; i<p->nCell; i++){
nPayload += p->aCell[i].nLocal;
}
pCsr->nPayload = nPayload;
}
return rc;
}
static int statDecodePage(Btree *pBt, StatPage *p){
int nUnused;
int iOff;
int nHdr;
int isLeaf;
int szPage;
u8 *aData = sqlite3PagerGetData(p->pPg);
u8 *aHdr = &aData[p->iPgno==1 ? 100 : 0];
p->flags = aHdr[0];
p->nCell = get2byte(&aHdr[3]);
p->nMxPayload = 0;
isLeaf = (p->flags==0x0A || p->flags==0x0D);
nHdr = 12 - isLeaf*4 + (p->iPgno==1)*100;
nUnused = get2byte(&aHdr[5]) - nHdr - 2*p->nCell;
nUnused += (int)aHdr[7];
iOff = get2byte(&aHdr[1]);
while( iOff ){
nUnused += get2byte(&aData[iOff+2]);
iOff = get2byte(&aData[iOff]);
}
p->nUnused = nUnused;
p->iRightChildPg = isLeaf ? 0 : sqlite3Get4byte(&aHdr[8]);
szPage = sqlite3BtreeGetPageSize(pBt);
if( p->nCell ){
int i; /* Used to iterate through cells */
int nUsable = szPage - sqlite3BtreeGetReserve(pBt);
p->aCell = sqlite3_malloc((p->nCell+1) * sizeof(StatCell));
memset(p->aCell, 0, (p->nCell+1) * sizeof(StatCell));
for(i=0; i<p->nCell; i++){
StatCell *pCell = &p->aCell[i];
iOff = get2byte(&aData[nHdr+i*2]);
if( !isLeaf ){
pCell->iChildPg = sqlite3Get4byte(&aData[iOff]);
iOff += 4;
}
if( p->flags==0x05 ){
/* A table interior node. nPayload==0. */
}else{
u32 nPayload; /* Bytes of payload total (local+overflow) */
int nLocal; /* Bytes of payload stored locally */
iOff += getVarint32(&aData[iOff], nPayload);
if( p->flags==0x0D ){
u64 dummy;
iOff += sqlite3GetVarint(&aData[iOff], &dummy);
}
if( nPayload>(u32)p->nMxPayload ) p->nMxPayload = nPayload;
getLocalPayload(nUsable, p->flags, nPayload, &nLocal);
pCell->nLocal = nLocal;
assert( nLocal>=0 );
assert( nPayload>=(u32)nLocal );
assert( nLocal<=(nUsable-35) );
if( nPayload>(u32)nLocal ){
int j;
int nOvfl = ((nPayload - nLocal) + nUsable-4 - 1) / (nUsable - 4);
pCell->nLastOvfl = (nPayload-nLocal) - (nOvfl-1) * (nUsable-4);
pCell->nOvfl = nOvfl;
pCell->aOvfl = sqlite3_malloc(sizeof(u32)*nOvfl);
pCell->aOvfl[0] = sqlite3Get4byte(&aData[iOff+nLocal]);
for(j=1; j<nOvfl; j++){
int rc;
u32 iPrev = pCell->aOvfl[j-1];
DbPage *pPg = 0;
rc = sqlite3PagerGet(sqlite3BtreePager(pBt), iPrev, &pPg);
if( rc!=SQLITE_OK ){
assert( pPg==0 );
return rc;
}
pCell->aOvfl[j] = sqlite3Get4byte(sqlite3PagerGetData(pPg));
sqlite3PagerUnref(pPg);
}
}
}
}
}
return SQLITE_OK;
}
