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Add the sqlite3session_table_filter API to the sessions extension.

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FossilOrigin-Name: b7e4dd889d37c8f57c2d3c7900e802f644aac3ea
This commit is contained in:
dan
2013-08-23 17:43:32 +00:00
parent 32683532f0
commit 7531a5a378
6 changed files with 185 additions and 23 deletions
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25
ext/session/sqlite3session.c
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@ -23,6 +23,8 @@ struct sqlite3_session {
int bIndirect; /* True if all changes are indirect */
int bAutoAttach; /* True to auto-attach tables */
int rc; /* Non-zero if an error has occurred */
void *pFilterCtx; /* First argument to pass to xTableFilter */
int (*xTableFilter)(void *pCtx, const char *zTab);
sqlite3_session *pNext; /* Next session object on same db. */
SessionTable *pTable; /* List of attached tables */
};
@ -1066,6 +1068,16 @@ static void xPreUpdate(
if( !pTab ){
/* This branch is taken if table zName has not yet been attached to
** this session and the auto-attach flag is set. */
/* If there is a table-filter configured, invoke it. If it returns 0,
** this change will not be recorded. Break out of the loop early in
** this case. */
if( pSession->xTableFilter
&& pSession->xTableFilter(pSession->pFilterCtx, zName)==0
){
break;
}
pSession->rc = sqlite3session_attach(pSession,zName);
if( pSession->rc ) break;
pTab = pSession->pTable;
@ -1170,6 +1182,19 @@ void sqlite3session_delete(sqlite3_session *pSession){
sqlite3_free(pSession);
}
/*
** Set a table filter on a Session Object.
*/
void sqlite3session_table_filter(
sqlite3_session *pSession,
int(*xFilter)(void*, const char*),
void *pCtx /* First argument passed to xFilter */
){
pSession->bAutoAttach = 1;
pSession->pFilterCtx = pCtx;
pSession->xTableFilter = xFilter;
}
/*
** Attach a table to a session. All subsequent changes made to the table
** while the session object is enabled will be recorded.