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New experimental API for attaching client data to a database connection.

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FossilOrigin-Name: d542837fdb42ebe810fc99225860d2cc7e6dd829a635bde820a09beff6bcb481
This commit is contained in:
drh
2023-08-30 15:20:15 +00:00
parent 8dd07389ac
commit 10deb35995
5 changed files with 148 additions and 25 deletions
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57
src/main.c
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@@ -1253,6 +1253,14 @@ static int sqlite3Close(sqlite3 *db, int forceZombie){
}
#endif
while( db->pDbData ){
DbClientData *p = db->pDbData;
db->pDbData = p->pNext;
assert( p->pData!=0 );
if( p->xDestructor ) p->xDestructor(p->pData);
sqlite3_free(p);
}
/* Convert the connection into a zombie and then close it.
*/
db->eOpenState = SQLITE_STATE_ZOMBIE;
@@ -3710,6 +3718,55 @@ int sqlite3_collation_needed16(
}
#endif /* SQLITE_OMIT_UTF16 */
/*
** Find existing client data.
*/
void *sqlite3_get_clientdata(sqlite3 *db, const char *zName){
DbClientData *p;
for(p=db->pDbData; p && strcmp(p->zName,zName); p=p->pNext){}
return p;
}
/*
** Add new client data to a database connection.
*/
int sqlite3_set_clientdata(
sqlite3 *db, /* Attach client data to this connection */
const char *zName, /* Name of the client data */
void *pData, /* The client data itself */
void (*xDestructor)(void*) /* Destructor */
){
DbClientData *p, **pp;
pp = &db->pDbData;
for(p=db->pDbData; p && strcmp(p->zName,zName); p=p->pNext){
pp = &p->pNext;
}
if( p ){
if( p->pData && p->xDestructor ) p->xDestructor(p->pData);
if( pData==0 ){
*pp = p->pNext;
sqlite3_free(p);
return SQLITE_OK;
}
}else if( pData==0 ){
return SQLITE_OK;
}else{
size_t n = strlen(zName);
p = sqlite3_malloc64( sizeof(DbClientData)+n+1 );
if( p==0 ){
if( pData && xDestructor ) xDestructor(pData);
return SQLITE_NOMEM;
}
memcpy(p->zName, zName, n+1);
p->pNext = db->pDbData;
db->pDbData = p;
}
p->pData = pData;
p->xDestructor = xDestructor;
return SQLITE_OK;
}
#ifndef SQLITE_OMIT_DEPRECATED
/*
** This function is now an anachronism. It used to be used to recover from a