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Backend support for autocommit removed, per recent discussions. The

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only remnant of this failed experiment is that the server will take
SET AUTOCOMMIT TO ON.  Still TODO: provide some client-side autocommit
logic in libpq.
This commit is contained in:
Tom Lane
2003-05-14 03:26:03 +00:00
parent d9b679c13a
commit f85f43dfb5
99 changed files with 277 additions and 536 deletions
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80
src/backend/access/transam/xact.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.147 2003/05/02 20:54:33 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.148 2003/05/14 03:26:00 tgl Exp $
*
* NOTES
* Transaction aborts can now occur two ways:
@ -212,15 +212,11 @@ int XactIsoLevel;
bool DefaultXactReadOnly = false;
bool XactReadOnly;
bool autocommit = true;
int CommitDelay = 0; /* precommit delay in microseconds */
int CommitSiblings = 5; /* number of concurrent xacts needed to
* sleep */
static bool suppressChain = false;
static void (*_RollbackFunc) (void *) = NULL;
static void *_RollbackData = NULL;
@ -1125,23 +1121,12 @@ CleanupTransaction(void)
/*
* StartTransactionCommand
*
* preventChain, if true, forces autocommit behavior at the next
* CommitTransactionCommand call.
*/
void
StartTransactionCommand(bool preventChain)
StartTransactionCommand(void)
{
TransactionState s = CurrentTransactionState;
/*
* Remember if caller wants to prevent autocommit-off chaining. This
* is only allowed if not already in a transaction block.
*/
suppressChain = preventChain;
if (preventChain && s->blockState != TBLOCK_DEFAULT)
elog(ERROR, "StartTransactionCommand: can't prevent chain");
switch (s->blockState)
{
/*
@ -1217,44 +1202,20 @@ StartTransactionCommand(bool preventChain)
/*
* CommitTransactionCommand
*
* forceCommit = true forces autocommit behavior even when autocommit is off.
*/
void
CommitTransactionCommand(bool forceCommit)
CommitTransactionCommand(void)
{
TransactionState s = CurrentTransactionState;
switch (s->blockState)
{
/*
* If we aren't in a transaction block, and we are doing
* autocommit, just do our usual transaction commit. But if
* we aren't doing autocommit, start a transaction block
* automatically by switching to INPROGRESS state. (We handle
* this choice here, and not earlier, so that an explicit
* BEGIN issued in autocommit-off mode won't issue strange
* warnings.)
*
* Autocommit mode is forced by either a true forceCommit
* parameter to me, or a true preventChain parameter to the
* preceding StartTransactionCommand call, or a
* PreventTransactionChain call during the transaction.
* (The parameters could be omitted, but it turns out most
* callers of StartTransactionCommand/CommitTransactionCommand
* want to force autocommit, so making them all call
* PreventTransactionChain would just be extra notation.)
* If we aren't in a transaction block, just do our usual
* transaction commit.
*/
case TBLOCK_DEFAULT:
if (autocommit || forceCommit || suppressChain)
CommitTransaction();
else
{
BeginTransactionBlock();
Assert(s->blockState == TBLOCK_INPROGRESS);
/* This code must match the TBLOCK_INPROGRESS case below: */
CommandCounterIncrement();
}
CommitTransaction();
break;
/*
@ -1323,10 +1284,7 @@ AbortCurrentTransaction(void)
*/
case TBLOCK_DEFAULT:
AbortTransaction();
if (autocommit || suppressChain)
CleanupTransaction();
else
s->blockState = TBLOCK_ABORT;
CleanupTransaction();
break;
/*
@ -1396,9 +1354,7 @@ AbortCurrentTransaction(void)
* If we have already started a transaction block, issue an error; also issue
* an error if we appear to be running inside a user-defined function (which
* could issue more commands and possibly cause a failure after the statement
* completes). In autocommit-off mode, we allow the statement if a block is
* not already started, and force the statement to be autocommitted despite
* the mode.
* completes).
*
* stmtNode: pointer to parameter block for statement; this is used in
* a very klugy way to determine whether we are inside a function.
@ -1428,14 +1384,7 @@ PreventTransactionChain(void *stmtNode, const char *stmtType)
/* If we got past IsTransactionBlock test, should be in default state */
if (CurrentTransactionState->blockState != TBLOCK_DEFAULT)
elog(ERROR, "PreventTransactionChain: can't prevent chain");
/* okay to set the flag */
suppressChain = true;
/* If we're in autocommit-off node, generate a notice */
if (!autocommit)
{
/* translator: %s represents an SQL statement name */
elog(NOTICE, "%s will be committed automatically", stmtType);
}
/* all okay */
}
/*
@ -1470,12 +1419,6 @@ RequireTransactionChain(void *stmtNode, const char *stmtType)
*/
if (!MemoryContextContains(QueryContext, stmtNode))
return;
/*
* If we are in autocommit-off mode then it's okay, because this
* statement will itself start a transaction block.
*/
if (!autocommit && !suppressChain)
return;
/* translator: %s represents an SQL statement name */
elog(ERROR, "%s may only be used in begin/end transaction blocks",
stmtType);
@ -1507,10 +1450,7 @@ BeginTransactionBlock(void)
s->blockState = TBLOCK_BEGIN;
/*
* do begin processing. NOTE: if you put anything here, check that it
* behaves properly in both autocommit-on and autocommit-off modes. In
* the latter case we will already have done some work in the new
* transaction.
* do begin processing here. Nothing to do at present.
*/
/*