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Add the sqlite3_create_function_v2() API, a version of create_function that allows a destructor to be specified.

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FossilOrigin-Name: 9a724dfbe822c77e76721abe3443c9cb018bb2e2
This commit is contained in:
dan
2010-08-27 17:48:52 +00:00
parent badc980afa
commit d2199f0f8d
8 changed files with 321 additions and 38 deletions
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26
src/sqliteInt.h
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@@ -600,6 +600,7 @@ typedef struct Expr Expr;
typedef struct ExprList ExprList;
typedef struct ExprSpan ExprSpan;
typedef struct FKey FKey;
typedef struct FuncDestructor FuncDestructor;
typedef struct FuncDef FuncDef;
typedef struct FuncDefHash FuncDefHash;
typedef struct IdList IdList;
@@ -956,6 +957,27 @@ struct FuncDef {
void (*xFinalize)(sqlite3_context*); /* Aggregate finalizer */
char *zName; /* SQL name of the function. */
FuncDef *pHash; /* Next with a different name but the same hash */
FuncDestructor *pDestructor; /* Reference counted destructor function */
};
/*
** This structure encapsulates a user-function destructor callback (as
** configured using create_function_v2()) and a reference counter. When
** create_function_v2() is called to create a function with a destructor,
** a single object of this type is allocated. FuncDestructor.nRef is set to
** the number of FuncDef objects created (either 1 or 3, depending on whether
** or not the specified encoding is SQLITE_ANY). The FuncDef.pDestructor
** member of each of the new FuncDef objects is set to point to the allocated
** FuncDestructor.
**
** Thereafter, when one of the FuncDef objects is deleted, the reference
** count on this object is decremented. When it reaches 0, the destructor
** is invoked and the FuncDestructor structure freed.
*/
struct FuncDestructor {
int nRef;
void (*xDestroy)(void *);
void *pUserData;
};
/*
@@ -2921,7 +2943,9 @@ int sqlite3SchemaToIndex(sqlite3 *db, Schema *);
KeyInfo *sqlite3IndexKeyinfo(Parse *, Index *);
int sqlite3CreateFunc(sqlite3 *, const char *, int, int, void *,
void (*)(sqlite3_context*,int,sqlite3_value **),
void (*)(sqlite3_context*,int,sqlite3_value **), void (*)(sqlite3_context*));
void (*)(sqlite3_context*,int,sqlite3_value **), void (*)(sqlite3_context*),
FuncDestructor *pDestructor
);
int sqlite3ApiExit(sqlite3 *db, int);
int sqlite3OpenTempDatabase(Parse *);