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Added support for user-defined normal functions. Support for user-defined

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aggregates is pending. (CVS 390)

FossilOrigin-Name: c490a1ff951c5d4a2de8e4f8d349189bfaef7f74
This commit is contained in:
drh
2002-02-23 23:45:45 +00:00
parent b29b0a5227
commit 8e0a2f903a
13 changed files with 380 additions and 45 deletions
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20
src/sqliteInt.h
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@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.90 2002/02/23 02:32:10 drh Exp $
** @(#) $Id: sqliteInt.h,v 1.91 2002/02/23 23:45:45 drh Exp $
*/
#include "sqlite.h"
#include "hash.h"
@@ -130,7 +130,7 @@ extern int sqlite_iMallocFail; /* Fail sqliteMalloc() after this many calls */
/*
** Integer identifiers for built-in SQL functions.
*/
#define FN_Unknown 0
#define FN_Unknown 0 /* Not a built-in. Might be user defined */
#define FN_Count 1
#define FN_Min 2
#define FN_Max 3
@@ -158,6 +158,7 @@ typedef struct WhereInfo WhereInfo;
typedef struct WhereLevel WhereLevel;
typedef struct Select Select;
typedef struct AggExpr AggExpr;
typedef struct UserFunc UserFunc;
/*
** Each database is an instance of the following structure
@@ -176,6 +177,7 @@ struct sqlite {
Hash idxHash; /* All (named) indices indexed by name */
Hash tblDrop; /* Uncommitted DROP TABLEs */
Hash idxDrop; /* Uncommitted DROP INDEXs */
Hash userFunc; /* User defined functions */
int lastRowid; /* ROWID of most recent insert */
int priorNewRowid; /* Last randomly generated ROWID */
int onError; /* Default conflict algorithm */
@@ -198,9 +200,18 @@ struct sqlite {
#define SQLITE_ResultDetails 0x00000100 /* Details added to result set */
/*
** Current file format version
** Each user-defined function is defined by an instance of the following
** structure. A pointer to this structure is stored in the sqlite.userFunc
** hash table. When multiple functions have the same name, the hash table
** points to a linked list of these structures.
*/
#define SQLITE_FileFormat 2
struct UserFunc {
void (*xFunc)(void*,int,const char**); /* Regular function */
void *(*xStep)(void*,int,const char**); /* Aggregate function step */
void (*xFinalize)(void*,void*); /* Aggregate function finializer */
int nArg; /* Number of arguments */
UserFunc *pNext; /* Next function with same name */
};
/*
** information about each column of an SQL table is held in an instance
@@ -634,3 +645,4 @@ void sqliteEndWriteOperation(Parse*);
void sqliteExprMoveStrings(Expr*, int);
void sqliteExprListMoveStrings(ExprList*, int);
void sqliteSelectMoveStrings(Select*, int);
UserFunc *sqliteFindUserFunction(sqlite*,const char*,int,int,int);