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Add support for the 'txn' argument to date/time functions that works like

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'now' but keeps the same time for the entire transaction.

FossilOrigin-Name: 5e4f45af96247e29910403a63ac148cb313b005f9c014b37a9a49d98f5fef9a6
This commit is contained in:
drh
2023-02-07 21:55:14 +00:00
parent c3ea539dc2
commit d4af882a1b
6 changed files with 65 additions and 15 deletions
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23
src/vdbeapi.c
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@@ -987,6 +987,29 @@ sqlite3_int64 sqlite3StmtCurrentTime(sqlite3_context *p){
return *piTime;
}
/*
** Return the current time for a transaction. If the current time
** is requested more than once within the same transaction
** the same time is returned for each invocation regardless
** of the amount of time that elapses between invocations. In other words,
** the time returned is always the time of the first call.
*/
sqlite3_int64 sqlite3TxnCurrentTime(sqlite3_context *p){
int rc;
#ifndef SQLITE_ENABLE_STAT4
sqlite3_int64 *piTime = &p->pVdbe->db->txnTime;
assert( p->pVdbe!=0 );
#else
sqlite3_int64 iTime = 0;
sqlite3_int64 *piTime = p->pVdbe!=0 ? &p->pVdbe->db->txnTime : &iTime;
#endif
if( *piTime==0 ){
rc = sqlite3OsCurrentTimeInt64(p->pOut->db->pVfs, piTime);
if( rc ) *piTime = 0;
}
return *piTime;
}
/*
** Create a new aggregate context for p and return a pointer to
** its pMem->z element.