|
8 | 8 | * |
9 | 9 | * |
10 | 10 | * IDENTIFICATION |
11 | | - * $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.138 2002/11/13 03:12:05 momjian Exp $ |
| 11 | + * $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.139 2002/11/18 01:17:39 tgl Exp $ |
12 | 12 | * |
13 | 13 | * NOTES |
14 | 14 | *Transaction aborts can now occur two ways: |
@@ -1488,6 +1488,50 @@ PreventTransactionChain(void *stmtNode, const char *stmtType) |
1488 | 1488 | } |
1489 | 1489 | } |
1490 | 1490 |
|
| 1491 | +/* -------------------------------- |
| 1492 | + *RequireTransactionChain |
| 1493 | + * |
| 1494 | + *This routine is to be called by statements that must run inside |
| 1495 | + *a transaction block, because they have no effects that persist past |
| 1496 | + *transaction end (and so calling them outside a transaction block |
| 1497 | + *is presumably an error). DECLARE CURSOR is an example. |
| 1498 | + * |
| 1499 | + *If we appear to be running inside a user-defined function, we do not |
| 1500 | + *issue an error, since the function could issue more commands that make |
| 1501 | + *use of the current statement's results. Thus this is an inverse for |
| 1502 | + *PreventTransactionChain. |
| 1503 | + * |
| 1504 | + *stmtNode: pointer to parameter block for statement; this is used in |
| 1505 | + *a very klugy way to determine whether we are inside a function. |
| 1506 | + *stmtType: statement type name for error messages. |
| 1507 | + * -------------------------------- |
| 1508 | + */ |
| 1509 | +void |
| 1510 | +RequireTransactionChain(void*stmtNode,constchar*stmtType) |
| 1511 | +{ |
| 1512 | +/* |
| 1513 | + * xact block already started? |
| 1514 | + */ |
| 1515 | +if (IsTransactionBlock()) |
| 1516 | +return; |
| 1517 | +/* |
| 1518 | + * Are we inside a function call? If the statement's parameter block |
| 1519 | + * was allocated in QueryContext, assume it is an interactive command. |
| 1520 | + * Otherwise assume it is coming from a function. |
| 1521 | + */ |
| 1522 | +if (!MemoryContextContains(QueryContext,stmtNode)) |
| 1523 | +return; |
| 1524 | +/* |
| 1525 | + * If we are in autocommit-off mode then it's okay, because this |
| 1526 | + * statement will itself start a transaction block. |
| 1527 | + */ |
| 1528 | +if (!autocommit&& !suppressChain) |
| 1529 | +return; |
| 1530 | +/* translator: %s represents an SQL statement name */ |
| 1531 | +elog(ERROR,"%s may only be used in begin/end transaction blocks", |
| 1532 | +stmtType); |
| 1533 | +} |
| 1534 | + |
1491 | 1535 |
|
1492 | 1536 | /* ---------------------------------------------------------------- |
1493 | 1537 | * transaction block support |
|