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## SQLite C Interface

## Virtual Table Object

>     struct sqlite3_module {
>       int iVersion;
>       int (*xCreate)(sqlite3*, void *pAux,
>                    int argc, const char *const*argv,
>                    sqlite3_vtab **ppVTab, char**);
>       int (*xConnect)(sqlite3*, void *pAux,
>                    int argc, const char *const*argv,
>                    sqlite3_vtab **ppVTab, char**);
>       int (*xBestIndex)(sqlite3_vtab *pVTab, sqlite3_index_info*);
>       int (*xDisconnect)(sqlite3_vtab *pVTab);
>       int (*xDestroy)(sqlite3_vtab *pVTab);
>       int (*xOpen)(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor);
>       int (*xClose)(sqlite3_vtab_cursor*);
>       int (*xFilter)(sqlite3_vtab_cursor*, int idxNum, const char *idxStr,
>                     int argc, sqlite3_value **argv);
>       int (*xNext)(sqlite3_vtab_cursor*);
>       int (*xEof)(sqlite3_vtab_cursor*);
>       int (*xColumn)(sqlite3_vtab_cursor*, sqlite3_context*, int);
>       int (*xRowid)(sqlite3_vtab_cursor*, sqlite3_int64 *pRowid);
>       int (*xUpdate)(sqlite3_vtab *, int, sqlite3_value **, sqlite3_int64 *);
>       int (*xBegin)(sqlite3_vtab *pVTab);
>       int (*xSync)(sqlite3_vtab *pVTab);
>       int (*xCommit)(sqlite3_vtab *pVTab);
>       int (*xRollback)(sqlite3_vtab *pVTab);
>       int (*xFindFunction)(sqlite3_vtab *pVtab, int nArg, const char *zName,
>                            void (**pxFunc)(sqlite3_context*,int,sqlite3_value**),
>                            void **ppArg);
>       int (*xRename)(sqlite3_vtab *pVtab, const char *zNew);
>       /* The methods above are in version 1 of the sqlite_module object. Those
>       ** below are for version 2 and greater. */
>       int (*xSavepoint)(sqlite3_vtab *pVTab, int);
>       int (*xRelease)(sqlite3_vtab *pVTab, int);
>       int (*xRollbackTo)(sqlite3_vtab *pVTab, int);
>     };

This structure, sometimes called a "virtual table module", defines the implementation of a virtual tables. This structure consists mostly of methods for the module.

A virtual table module is created by filling in a persistent instance of this structure and passing a pointer to that instance to sqlite3_create_module() or sqlite3_create_module_v2(). The registration remains valid until it is replaced by a different module or until the database connection closes. The content of this structure must not change while it is registered with any database connection.

See also lists of Objects, Constants, and Functions.

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