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Change SET LOCAL/CONSTRAINTS/TRANSACTION and ABORT behavior

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Change SET LOCAL/CONSTRAINTS/TRANSACTION behavior outside of a
transaction block from error (post-9.3) to warning.  (Was nothing in <=
9.3.)  Also change ABORT outside of a transaction block from notice to
warning.
This commit is contained in:
Bruce Momjian 2013-11-25 19:19:40 -05:00
parent 05b476c298
commit a6542a4b68
11 changed files with 47 additions and 28 deletions
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3
doc/src/sgml/ref/abort.sgml
View File

@ -63,8 +63,7 @@ ABORT [ WORK | TRANSACTION ]
</para>
<para>
Issuing <command>ABORT</> when not inside a transaction does
no harm, but it will provoke a warning message.
Issuing <command>ABORT</> outside of a transaction block has no effect.
</para>
</refsect1>

4
doc/src/sgml/ref/rollback.sgml
View File

@ -59,8 +59,8 @@ ROLLBACK [ WORK | TRANSACTION ]
</para>
<para>
Issuing <command>ROLLBACK</> when not inside a transaction does
no harm, but it will provoke a warning message.
Issuing <command>ROLLBACK</> outside of a transaction
block has no effect.
</para>
</refsect1>

5
doc/src/sgml/ref/set.sgml
View File

@ -110,9 +110,8 @@ SET [ SESSION | LOCAL ] TIME ZONE { <replaceable class="PARAMETER">timezone</rep
<para>
Specifies that the command takes effect for only the current
transaction. After <command>COMMIT</> or <command>ROLLBACK</>,
the session-level setting takes effect again.
<productname>PostgreSQL</productname> reports an error if
<command>SET LOCAL</> is used outside a transaction block.
the session-level setting takes effect again. This has no effect
outside of a transaction block.
</para>
</listitem>
</varlistentry>

5
doc/src/sgml/ref/set_constraints.sgml
View File

@ -99,10 +99,7 @@ SET CONSTRAINTS { ALL | <replaceable class="parameter">name</replaceable> [, ...
<para>
This command only alters the behavior of constraints within the
current transaction. Thus, if you execute this command outside of a
transaction block
(<command>BEGIN</command>/<command>COMMIT</command> pair), it will
generate an error.
current transaction. This has no effect outside of a transaction block.
</para>
</refsect1>

2
doc/src/sgml/ref/set_transaction.sgml
View File

@ -185,7 +185,7 @@ SET SESSION CHARACTERISTICS AS TRANSACTION <replaceable class="parameter">transa
<para>
If <command>SET TRANSACTION</command> is executed without a prior
<command>START TRANSACTION</command> or <command>BEGIN</command>,
it will generate an error.
it will have no effect.
</para>
<para>

37
src/backend/access/transam/xact.c
View File

@ -265,6 +265,8 @@ static void CallSubXactCallbacks(SubXactEvent event,
SubTransactionId mySubid,
SubTransactionId parentSubid);
static void CleanupTransaction(void);
static void CheckTransactionChain(bool isTopLevel, bool throwError,
const char *stmtType);
static void CommitTransaction(void);
static TransactionId RecordTransactionAbort(bool isSubXact);
static void StartTransaction(void);
@ -2948,6 +2950,26 @@ PreventTransactionChain(bool isTopLevel, const char *stmtType)
/* all okay */
}
/*
* These two functions allow for warnings or errors if a command is
* executed outside of a transaction block.
*
* While top-level transaction control commands (BEGIN/COMMIT/ABORT) and
* SET that have no effect issue warnings, all other no-effect commands
* generate errors.
*/
void
WarnNoTransactionChain(bool isTopLevel, const char *stmtType)
{
CheckTransactionChain(isTopLevel, false, stmtType);
}
void
RequireTransactionChain(bool isTopLevel, const char *stmtType)
{
CheckTransactionChain(isTopLevel, true, stmtType);
}
/*
* RequireTransactionChain
*
@ -2957,16 +2979,16 @@ PreventTransactionChain(bool isTopLevel, const char *stmtType)
* is presumably an error). DECLARE CURSOR is an example.
*
* If we appear to be running inside a user-defined function, we do not
* issue an error, since the function could issue more commands that make
* issue anything, since the function could issue more commands that make
* use of the current statement's results. Likewise subtransactions.
* Thus this is an inverse for PreventTransactionChain.
*
* isTopLevel: passed down from ProcessUtility to determine whether we are
* inside a function.
* stmtType: statement type name, for error messages.
* stmtType: statement type name, for warning or error messages.
*/
void
RequireTransactionChain(bool isTopLevel, const char *stmtType)
static void
CheckTransactionChain(bool isTopLevel, bool throwError, const char *stmtType)
{
/*
* xact block already started?
@ -2986,11 +3008,12 @@ RequireTransactionChain(bool isTopLevel, const char *stmtType)
if (!isTopLevel)
return;
ereport(ERROR,
ereport(throwError ? ERROR : WARNING,
(errcode(ERRCODE_NO_ACTIVE_SQL_TRANSACTION),
/* translator: %s represents an SQL statement name */
errmsg("%s can only be used in transaction blocks",
stmtType)));
return;
}
/*
@ -3425,12 +3448,12 @@ UserAbortTransactionBlock(void)
/*
* The user issued ABORT when not inside a transaction. Issue a
* NOTICE and go to abort state. The upcoming call to
* WARNING and go to abort state. The upcoming call to
* CommitTransactionCommand() will then put us back into the
* default state.
*/
case TBLOCK_STARTED:
ereport(NOTICE,
ereport(WARNING,
(errcode(ERRCODE_NO_ACTIVE_SQL_TRANSACTION),
errmsg("there is no transaction in progress")));
s->blockState = TBLOCK_ABORT_PENDING;

2
src/backend/tcop/utility.c
View File

@ -754,7 +754,7 @@ standard_ProcessUtility(Node *parsetree,
break;
case T_ConstraintsSetStmt:
RequireTransactionChain(isTopLevel, "SET CONSTRAINTS");
WarnNoTransactionChain(isTopLevel, "SET CONSTRAINTS");
AfterTriggerSetState((ConstraintsSetStmt *) parsetree);
break;

10
src/backend/utils/misc/guc.c
View File

@ -6274,7 +6274,7 @@ ExecSetVariableStmt(VariableSetStmt *stmt, bool isTopLevel)
case VAR_SET_VALUE:
case VAR_SET_CURRENT:
if (stmt->is_local)
RequireTransactionChain(isTopLevel, "SET LOCAL");
WarnNoTransactionChain(isTopLevel, "SET LOCAL");
(void) set_config_option(stmt->name,
ExtractSetVariableArgs(stmt),
(superuser() ? PGC_SUSET : PGC_USERSET),
@ -6295,7 +6295,7 @@ ExecSetVariableStmt(VariableSetStmt *stmt, bool isTopLevel)
{
ListCell *head;
RequireTransactionChain(isTopLevel, "SET TRANSACTION");
WarnNoTransactionChain(isTopLevel, "SET TRANSACTION");
foreach(head, stmt->args)
{
@ -6346,7 +6346,7 @@ ExecSetVariableStmt(VariableSetStmt *stmt, bool isTopLevel)
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("SET LOCAL TRANSACTION SNAPSHOT is not implemented")));
RequireTransactionChain(isTopLevel, "SET TRANSACTION");
WarnNoTransactionChain(isTopLevel, "SET TRANSACTION");
Assert(IsA(con, A_Const));
Assert(nodeTag(&con->val) == T_String);
ImportSnapshot(strVal(&con->val));
@ -6357,11 +6357,11 @@ ExecSetVariableStmt(VariableSetStmt *stmt, bool isTopLevel)
break;
case VAR_SET_DEFAULT:
if (stmt->is_local)
RequireTransactionChain(isTopLevel, "SET LOCAL");
WarnNoTransactionChain(isTopLevel, "SET LOCAL");
/* fall through */
case VAR_RESET:
if (strcmp(stmt->name, "transaction_isolation") == 0)
RequireTransactionChain(isTopLevel, "RESET TRANSACTION");
WarnNoTransactionChain(isTopLevel, "RESET TRANSACTION");
(void) set_config_option(stmt->name,
NULL,

1
src/include/access/xact.h
View File

@ -245,6 +245,7 @@ extern char TransactionBlockStatusCode(void);
extern void AbortOutOfAnyTransaction(void);
extern void PreventTransactionChain(bool isTopLevel, const char *stmtType);
extern void RequireTransactionChain(bool isTopLevel, const char *stmtType);
extern void WarnNoTransactionChain(bool isTopLevel, const char *stmtType);
extern bool IsInTransactionChain(bool isTopLevel);
extern void RegisterXactCallback(XactCallback callback, void *arg);
extern void UnregisterXactCallback(XactCallback callback, void *arg);

2
src/test/regress/expected/errors.out
View File

@ -114,7 +114,7 @@ ERROR: column name "oid" conflicts with a system column name
-- TRANSACTION STUFF
-- not in a xact
abort;
NOTICE: there is no transaction in progress
WARNING: there is no transaction in progress
-- not in a xact
end;
WARNING: there is no transaction in progress

4
src/test/regress/expected/guc.out
View File

@ -29,7 +29,7 @@ SELECT '2006-08-13 12:34:56'::timestamptz;
-- SET LOCAL has no effect outside of a transaction
SET LOCAL vacuum_cost_delay TO 50;
ERROR: SET LOCAL can only be used in transaction blocks
WARNING: SET LOCAL can only be used in transaction blocks
SHOW vacuum_cost_delay;
vacuum_cost_delay
-------------------
@ -37,7 +37,7 @@ SHOW vacuum_cost_delay;
(1 row)
SET LOCAL datestyle = 'SQL';
ERROR: SET LOCAL can only be used in transaction blocks
WARNING: SET LOCAL can only be used in transaction blocks
SHOW datestyle;
DateStyle
-----------