Esempio n. 1
0
/*
** Check to see if virtual table module pMod can be have an eponymous
** virtual table instance.  If it can, create one if one does not already
** exist. Return non-zero if the eponymous virtual table instance exists
** when this routine returns, and return zero if it does not exist.
**
** An eponymous virtual table instance is one that is named after its
** module, and more importantly, does not require a CREATE VIRTUAL TABLE
** statement in order to come into existance.  Eponymous virtual table
** instances always exist.  They cannot be DROP-ed.
**
** Any virtual table module for which xConnect and xCreate are the same
** method can have an eponymous virtual table instance.
*/
int sqlite3VtabEponymousTableInit(Parse *pParse, Module *pMod){
  const sqlite3_module *pModule = pMod->pModule;
  Table *pTab;
  char *zErr = 0;
  int rc;
  sqlite3 *db = pParse->db;
  if( pMod->pEpoTab ) return 1;
  if( pModule->xCreate!=0 && pModule->xCreate!=pModule->xConnect ) return 0;
  pTab = sqlite3DbMallocZero(db, sizeof(Table));
  if( pTab==0 ) return 0;
  pTab->zName = sqlite3DbStrDup(db, pMod->zName);
  if( pTab->zName==0 ){
    sqlite3DbFree(db, pTab);
    return 0;
  }
  pMod->pEpoTab = pTab;
  pTab->nTabRef = 1;
  pTab->pSchema = db->aDb[0].pSchema;
  pTab->tabFlags |= TF_Virtual;
  pTab->nModuleArg = 0;
  pTab->iPKey = -1;
  addModuleArgument(db, pTab, sqlite3DbStrDup(db, pTab->zName));
  addModuleArgument(db, pTab, 0);
  addModuleArgument(db, pTab, sqlite3DbStrDup(db, pTab->zName));
  rc = vtabCallConstructor(db, pTab, pMod, pModule->xConnect, &zErr);
  if( rc ){
    sqlite3ErrorMsg(pParse, "%s", zErr);
    sqlite3DbFree(db, zErr);
    sqlite3VtabEponymousTableClear(db, pMod);
    return 0;
  }
  return 1;
}
Esempio n. 2
0
/*
** This routine takes the module argument that has been accumulating
** in pParse->zArg[] and appends it to the list of arguments on the
** virtual table currently under construction in pParse->pTable.
*/
static void addArgumentToVtab(Parse *pParse){
  if( pParse->sArg.z && pParse->pNewTable ){
    const char *z = (const char*)pParse->sArg.z;
    int n = pParse->sArg.n;
    addModuleArgument(pParse->pNewTable, sqliteStrNDup(z, n));
  }
}
Esempio n. 3
0
/*
** This routine takes the module argument that has been accumulating
** in pParse->zArg[] and appends it to the list of arguments on the
** virtual table currently under construction in pParse->pTable.
*/
static void addArgumentToVtab(Parse *pParse){
  if( pParse->sArg.z && ALWAYS(pParse->pNewTable) ){
    const char *z = (const char*)pParse->sArg.z;
    int n = pParse->sArg.n;
    sqlite3 *db = pParse->db;
    addModuleArgument(db, pParse->pNewTable, sqlite3DbStrNDup(db, z, n));
  }
}
Esempio n. 4
0
/*
** The parser calls this routine when it first sees a CREATE VIRTUAL TABLE
** statement.  The module name has been parsed, but the optional list
** of parameters that follow the module name are still pending.
*/
void sqlite3VtabBeginParse(
  Parse *pParse,        /* Parsing context */
  Token *pName1,        /* Name of new table, or database name */
  Token *pName2,        /* Name of new table or NULL */
  Token *pModuleName,   /* Name of the module for the virtual table */
  int ifNotExists       /* No error if the table already exists */
){
  int iDb;              /* The database the table is being created in */
  Table *pTable;        /* The new virtual table */
  sqlite3 *db;          /* Database connection */

  sqlite3StartTable(pParse, pName1, pName2, 0, 0, 1, ifNotExists);
  pTable = pParse->pNewTable;
  if( pTable==0 ) return;
  assert( 0==pTable->pIndex );

  db = pParse->db;
  iDb = sqlite3SchemaToIndex(db, pTable->pSchema);
  assert( iDb>=0 );

  pTable->tabFlags |= TF_Virtual;
  pTable->nModuleArg = 0;
  addModuleArgument(db, pTable, sqlite3NameFromToken(db, pModuleName));
  addModuleArgument(db, pTable, 0);
  addModuleArgument(db, pTable, sqlite3DbStrDup(db, pTable->zName));
  assert( (pParse->sNameToken.z==pName2->z && pName2->z!=0)
       || (pParse->sNameToken.z==pName1->z && pName2->z==0)
  );
  pParse->sNameToken.n = (int)(
      &pModuleName->z[pModuleName->n] - pParse->sNameToken.z
  );

#ifndef SQLITE_OMIT_AUTHORIZATION
  /* Creating a virtual table invokes the authorization callback twice.
  ** The first invocation, to obtain permission to INSERT a row into the
  ** sqlite_master table, has already been made by sqlite3StartTable().
  ** The second call, to obtain permission to create the table, is made now.
  */
  if( pTable->azModuleArg ){
    sqlite3AuthCheck(pParse, SQLITE_CREATE_VTABLE, pTable->zName, 
            pTable->azModuleArg[0], pParse->db->aDb[iDb].zDbSName);
  }
#endif
}
Esempio n. 5
0
/*
** The parser calls this routine when it first sees a CREATE VIRTUAL TABLE
** statement.  The module name has been parsed, but the optional list
** of parameters that follow the module name are still pending.
*/
void sqlite3VtabBeginParse(
  Parse *pParse,        /* Parsing context */
  Token *pName1,        /* Name of new table, or database name */
  Token *pName2,        /* Name of new table or NULL */
  Token *pModuleName    /* Name of the module for the virtual table */
){
  int iDb;              /* The database the table is being created in */
  Table *pTable;        /* The new virtual table */

#ifndef SQLITE_OMIT_SHARED_CACHE
  if( sqlite3ThreadDataReadOnly()->useSharedData ){
    sqlite3ErrorMsg(pParse, "Cannot use virtual tables in shared-cache mode");
    return;
  }
#endif

  sqlite3StartTable(pParse, pName1, pName2, 0, 0, 1, 0);
  pTable = pParse->pNewTable;
  if( pTable==0 || pParse->nErr ) return;
  assert( 0==pTable->pIndex );

  iDb = sqlite3SchemaToIndex(pParse->db, pTable->pSchema);
  assert( iDb>=0 );

  pTable->isVirtual = 1;
  pTable->nModuleArg = 0;
  addModuleArgument(pTable, sqlite3NameFromToken(pModuleName));
  addModuleArgument(pTable, sqlite3StrDup(pParse->db->aDb[iDb].zName));
  addModuleArgument(pTable, sqlite3StrDup(pTable->zName));
  pParse->sNameToken.n = pModuleName->z + pModuleName->n - pName1->z;

#ifndef SQLITE_OMIT_AUTHORIZATION
  /* Creating a virtual table invokes the authorization callback twice.
  ** The first invocation, to obtain permission to INSERT a row into the
  ** sqlite_master table, has already been made by sqlite3StartTable().
  ** The second call, to obtain permission to create the table, is made now.
  */
  if( pTable->azModuleArg ){
    sqlite3AuthCheck(pParse, SQLITE_CREATE_VTABLE, pTable->zName, 
            pTable->azModuleArg[0], pParse->db->aDb[iDb].zName);
  }
#endif
}