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-rw-r--r--doc/src/sgml/plpgsql.sgml130
-rw-r--r--src/backend/access/transam/xact.c137
-rw-r--r--src/include/access/xact.h6
-rw-r--r--src/include/utils/errcodes.h6
-rw-r--r--src/pl/plpgsql/src/gram.y64
-rw-r--r--src/pl/plpgsql/src/pl_exec.c128
-rw-r--r--src/pl/plpgsql/src/pl_funcs.c78
-rw-r--r--src/pl/plpgsql/src/plerrcodes.h203
-rw-r--r--src/pl/plpgsql/src/plpgsql.h29
-rw-r--r--src/test/regress/expected/plpgsql.out57
-rw-r--r--src/test/regress/sql/plpgsql.sql33
11 files changed, 764 insertions, 107 deletions
diff --git a/doc/src/sgml/plpgsql.sgml b/doc/src/sgml/plpgsql.sgml
index b30cc7e83fe..7f3f84448d7 100644
--- a/doc/src/sgml/plpgsql.sgml
+++ b/doc/src/sgml/plpgsql.sgml
@@ -1,5 +1,5 @@
<!--
-$PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.41 2004/07/11 23:26:51 momjian Exp $
+$PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.42 2004/07/31 07:39:17 tgl Exp $
-->
<chapter id="plpgsql">
@@ -1796,6 +1796,101 @@ END LOOP;
rather than the simple syntax error one might expect to get.
</para>
</note>
+ </sect2>
+
+ <sect2 id="plpgsql-error-trapping">
+ <title>Trapping Errors</title>
+
+ <para>
+ By default, any error occurring in a <application>PL/pgSQL</>
+ function aborts execution of the function, and indeed of the
+ surrounding transaction as well. You can trap errors and recover
+ from them by using a <command>BEGIN</> block with an
+ <literal>EXCEPTION</> clause. The syntax is an extension of the
+ normal syntax for a <command>BEGIN</> block:
+
+<synopsis>
+<optional> &lt;&lt;<replaceable>label</replaceable>&gt;&gt; </optional>
+<optional> DECLARE
+ <replaceable>declarations</replaceable> </optional>
+BEGIN
+ <replaceable>statements</replaceable>
+EXCEPTION
+ WHEN <replaceable>condition</replaceable> THEN
+ <replaceable>handler_statements</replaceable>
+ <optional> WHEN <replaceable>condition</replaceable> THEN
+ <replaceable>handler_statements</replaceable>
+ ...
+ </optional>
+END;
+</synopsis>
+ </para>
+
+ <para>
+ If no error occurs, this form of block simply executes all the
+ <replaceable>statements</replaceable>, and then control passes
+ to the next statement after <literal>END</>. But if an error
+ occurs within the <replaceable>statements</replaceable>, further
+ processing of the <replaceable>statements</replaceable> is
+ abandoned, and control passes to the <literal>EXCEPTION</> list.
+ The list is searched for the first <replaceable>condition</replaceable>
+ matching the error that occurred. If a match is found, the
+ corresponding <replaceable>handler_statements</replaceable> are
+ executed, and then control passes to the next statement after
+ <literal>END</>. If no match is found, the error propagates out
+ as though the <literal>EXCEPTION</> clause were not there at all:
+ the error can be caught by an enclosing block with
+ <literal>EXCEPTION</>, or if there is none it aborts processing
+ of the function. The special condition name <literal>OTHERS</>
+ matches every error type except <literal>QUERY_CANCELED</>.
+ (It is possible, but usually not a good idea, to trap
+ <literal>QUERY_CANCELED</> by name.)
+ </para>
+
+ <para>
+ If a new error occurs within the selected
+ <replaceable>handler_statements</replaceable>, it cannot be caught
+ by this <literal>EXCEPTION</> clause, but is propagated out.
+ A surrounding <literal>EXCEPTION</> clause could catch it.
+ </para>
+
+ <para>
+ When an error is caught by an <literal>EXCEPTION</> clause,
+ the local variables of the <application>PL/pgSQL</> function
+ remain as they were when the error occurred, but all changes
+ to persistent database state within the block are rolled back.
+ As an example, consider this fragment:
+
+<programlisting>
+ INSERT INTO mytab(firstname, lastname) VALUES('Tom', 'Jones');
+ BEGIN
+ UPDATE mytab SET firstname = 'Joe' WHERE lastname = 'Jones';
+ x := x + 1;
+ y := x / 0;
+ EXCEPTION
+ WHEN division_by_zero THEN
+ RAISE NOTICE 'caught division_by_zero';
+ RETURN x;
+ END;
+</programlisting>
+
+ When control reaches the assignment to <literal>y</>, it will
+ fail with a <literal>division_by_zero</> error. This will be caught by
+ the <literal>EXCEPTION</> clause. The value returned in the
+ <command>RETURN</> statement will be the incremented value of
+ <literal>x</>, but the effects of the <command>UPDATE</> command will
+ have been rolled back. The <command>INSERT</> command is not rolled
+ back, however, so the end result is that the database contains
+ <literal>Tom Jones</> not <literal>Joe Jones</>.
+ </para>
+
+ <tip>
+ <para>
+ A block containing an <literal>EXCEPTION</> clause is significantly
+ more expensive to enter and exit than a block without one. Therefore,
+ don't use <literal>EXCEPTION</> without need.
+ </para>
+ </tip>
</sect2>
</sect1>
@@ -2120,11 +2215,11 @@ RAISE <replaceable class="parameter">level</replaceable> '<replaceable class="pa
</synopsis>
Possible levels are <literal>DEBUG</literal>,
- <literal>LOG</literal>,
+ <literal>LOG</literal>, <literal>INFO</literal>,
<literal>NOTICE</literal>, <literal>WARNING</literal>,
and <literal>EXCEPTION</literal>.
- <literal>EXCEPTION</literal> raises an error and aborts the current
- transaction; the other levels only generate messages of different
+ <literal>EXCEPTION</literal> raises an error (which normally aborts the
+ current transaction); the other levels only generate messages of different
priority levels.
Whether messages of a particular priority are reported to the client,
written to the server log, or both is controlled by the
@@ -2164,28 +2259,11 @@ RAISE EXCEPTION 'Nonexistent ID --> %', user_id;
</para>
<para>
- <productname>PostgreSQL</productname> does not have a very smart
- exception handling model. Whenever the parser, planner/optimizer
- or executor decide that a statement cannot be processed any longer,
- the whole transaction gets aborted and the system jumps back
- into the main loop to get the next command from the client application.
- </para>
-
- <para>
- It is possible to hook into the error mechanism to notice that this
- happens. But currently it is impossible to tell what really
- caused the abort (data type format error, floating-point
- error, parse error, etc.). And it is possible that the database server
- is in an inconsistent state at this point so returning to the upper
- executor or issuing more commands might corrupt the whole database.
- </para>
-
- <para>
- Thus, the only thing <application>PL/pgSQL</application>
- currently does when it encounters an abort during execution of a
- function or trigger procedure is to add some fields to the message
- telling in which function and where (line number and type of statement)
- the error happened. The error always stops execution of the function.
+ <command>RAISE EXCEPTION</command> presently always generates
+ the same SQLSTATE code, <literal>P0001</>, no matter what message
+ it is invoked with. It is possible to trap this exception with
+ <literal>EXCEPTION ... WHEN RAISE_EXCEPTION THEN ...</> but there
+ is no way to tell one <command>RAISE</> from another.
</para>
</sect1>
diff --git a/src/backend/access/transam/xact.c b/src/backend/access/transam/xact.c
index f938cdcc5ba..b6758a14b22 100644
--- a/src/backend/access/transam/xact.c
+++ b/src/backend/access/transam/xact.c
@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.173 2004/07/28 14:23:27 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.174 2004/07/31 07:39:18 tgl Exp $
*
* NOTES
* Transaction aborts can now occur two ways:
@@ -1589,7 +1589,8 @@ CleanupTransaction(void)
* State should still be TRANS_ABORT from AbortTransaction().
*/
if (s->state != TRANS_ABORT)
- elog(FATAL, "CleanupTransaction and not in abort state");
+ elog(FATAL, "CleanupTransaction: unexpected state %s",
+ TransStateAsString(s->state));
/*
* do abort cleanup processing
@@ -1773,7 +1774,7 @@ CommitTransactionCommand(void)
/*
* We were just issued a SAVEPOINT inside a transaction block.
- * Start a subtransaction. (BeginTransactionBlock already
+ * Start a subtransaction. (DefineSavepoint already
* did PushTransaction, so as to have someplace to put the
* SUBBEGIN state.)
*/
@@ -1853,6 +1854,7 @@ CleanupAbortedSubTransactions(bool returnName)
AssertState(PointerIsValid(s->parent));
Assert(s->parent->blockState == TBLOCK_SUBINPROGRESS ||
s->parent->blockState == TBLOCK_INPROGRESS ||
+ s->parent->blockState == TBLOCK_STARTED ||
s->parent->blockState == TBLOCK_SUBABORT_PENDING);
/*
@@ -1878,7 +1880,8 @@ CleanupAbortedSubTransactions(bool returnName)
}
AssertState(s->blockState == TBLOCK_SUBINPROGRESS ||
- s->blockState == TBLOCK_INPROGRESS);
+ s->blockState == TBLOCK_INPROGRESS ||
+ s->blockState == TBLOCK_STARTED);
return name;
}
@@ -2468,7 +2471,7 @@ DefineSavepoint(char *name)
case TBLOCK_SUBABORT_PENDING:
case TBLOCK_SUBENDABORT_RELEASE:
case TBLOCK_SUBEND:
- elog(FATAL, "BeginTransactionBlock: unexpected state %s",
+ elog(FATAL, "DefineSavepoint: unexpected state %s",
BlockStateAsString(s->blockState));
break;
}
@@ -2657,20 +2660,126 @@ RollbackToSavepoint(List *options)
}
/*
- * RollbackAndReleaseSavepoint
+ * BeginInternalSubTransaction
+ * This is the same as DefineSavepoint except it allows TBLOCK_STARTED
+ * state, and therefore it can safely be used in a function that might
+ * be called when not inside a BEGIN block. Also, we automatically
+ * cycle through CommitTransactionCommand/StartTransactionCommand
+ * instead of expecting the caller to do it.
+ *
+ * Optionally, name can be NULL to create an unnamed savepoint.
+ */
+void
+BeginInternalSubTransaction(char *name)
+{
+ TransactionState s = CurrentTransactionState;
+
+ switch (s->blockState)
+ {
+ case TBLOCK_STARTED:
+ case TBLOCK_INPROGRESS:
+ case TBLOCK_SUBINPROGRESS:
+ /* Normal subtransaction start */
+ PushTransaction();
+ s = CurrentTransactionState; /* changed by push */
+ /*
+ * Note that we are allocating the savepoint name in the
+ * parent transaction's CurTransactionContext, since we
+ * don't yet have a transaction context for the new guy.
+ */
+ if (name)
+ s->name = MemoryContextStrdup(CurTransactionContext, name);
+ s->blockState = TBLOCK_SUBBEGIN;
+ break;
+
+ /* These cases are invalid. Reject them altogether. */
+ case TBLOCK_DEFAULT:
+ case TBLOCK_BEGIN:
+ case TBLOCK_SUBBEGIN:
+ case TBLOCK_ABORT:
+ case TBLOCK_SUBABORT:
+ case TBLOCK_ENDABORT:
+ case TBLOCK_END:
+ case TBLOCK_SUBENDABORT_ALL:
+ case TBLOCK_SUBENDABORT:
+ case TBLOCK_SUBABORT_PENDING:
+ case TBLOCK_SUBENDABORT_RELEASE:
+ case TBLOCK_SUBEND:
+ elog(FATAL, "BeginInternalSubTransaction: unexpected state %s",
+ BlockStateAsString(s->blockState));
+ break;
+ }
+
+ CommitTransactionCommand();
+ StartTransactionCommand();
+}
+
+/*
+ * ReleaseCurrentSubTransaction
+ *
+ * RELEASE (ie, commit) the innermost subtransaction, regardless of its
+ * savepoint name (if any).
+ * NB: do NOT use CommitTransactionCommand/StartTransactionCommand with this.
+ */
+void
+ReleaseCurrentSubTransaction(void)
+{
+ TransactionState s = CurrentTransactionState;
+
+ if (s->blockState != TBLOCK_SUBINPROGRESS)
+ elog(ERROR, "ReleaseCurrentSubTransaction: unexpected state %s",
+ BlockStateAsString(s->blockState));
+ MemoryContextSwitchTo(CurTransactionContext);
+ CommitTransactionToLevel(GetCurrentTransactionNestLevel());
+}
+
+/*
+ * RollbackAndReleaseCurrentSubTransaction
*
- * Executes a ROLLBACK TO command, immediately followed by a RELEASE
- * of the same savepoint.
+ * ROLLBACK and RELEASE (ie, abort) the innermost subtransaction, regardless
+ * of its savepoint name (if any).
+ * NB: do NOT use CommitTransactionCommand/StartTransactionCommand with this.
*/
void
-RollbackAndReleaseSavepoint(List *options)
+RollbackAndReleaseCurrentSubTransaction(void)
{
- TransactionState s;
+ TransactionState s = CurrentTransactionState;
- RollbackToSavepoint(options);
- s = CurrentTransactionState;
- Assert(s->blockState == TBLOCK_SUBENDABORT);
+ switch (s->blockState)
+ {
+ /* Must be in a subtransaction */
+ case TBLOCK_SUBABORT:
+ case TBLOCK_SUBINPROGRESS:
+ break;
+
+ /* these cases are invalid. */
+ case TBLOCK_DEFAULT:
+ case TBLOCK_STARTED:
+ case TBLOCK_ABORT:
+ case TBLOCK_INPROGRESS:
+ case TBLOCK_BEGIN:
+ case TBLOCK_END:
+ case TBLOCK_ENDABORT:
+ case TBLOCK_SUBEND:
+ case TBLOCK_SUBENDABORT_ALL:
+ case TBLOCK_SUBENDABORT:
+ case TBLOCK_SUBABORT_PENDING:
+ case TBLOCK_SUBENDABORT_RELEASE:
+ case TBLOCK_SUBBEGIN:
+ elog(FATAL, "RollbackAndReleaseCurrentSubTransaction: unexpected state %s",
+ BlockStateAsString(s->blockState));
+ break;
+ }
+
+ /*
+ * Abort the current subtransaction, if needed.
+ */
+ if (s->blockState == TBLOCK_SUBINPROGRESS)
+ AbortSubTransaction();
s->blockState = TBLOCK_SUBENDABORT_RELEASE;
+
+ /* And clean it up, too */
+ CleanupAbortedSubTransactions(false);
}
/*
@@ -2748,7 +2857,7 @@ AbortOutOfAnyTransaction(void)
* Commit everything from the current transaction level
* up to the specified level (inclusive).
*/
-void
+static void
CommitTransactionToLevel(int level)
{
TransactionState s = CurrentTransactionState;
diff --git a/src/include/access/xact.h b/src/include/access/xact.h
index 7bf92b0153d..532dcf51b0e 100644
--- a/src/include/access/xact.h
+++ b/src/include/access/xact.h
@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/access/xact.h,v 1.67 2004/07/27 05:11:24 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/access/xact.h,v 1.68 2004/07/31 07:39:19 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -107,7 +107,9 @@ extern void UserAbortTransactionBlock(void);
extern void ReleaseSavepoint(List *options);
extern void DefineSavepoint(char *name);
extern void RollbackToSavepoint(List *options);
-extern void RollbackAndReleaseSavepoint(List *options);
+extern void BeginInternalSubTransaction(char *name);
+extern void ReleaseCurrentSubTransaction(void);
+extern void RollbackAndReleaseCurrentSubTransaction(void);
extern bool IsSubTransaction(void);
extern bool IsTransactionBlock(void);
extern bool IsTransactionOrTransactionBlock(void);
diff --git a/src/include/utils/errcodes.h b/src/include/utils/errcodes.h
index f3ac7f6c0b4..a695b90a2ea 100644
--- a/src/include/utils/errcodes.h
+++ b/src/include/utils/errcodes.h
@@ -11,7 +11,7 @@
*
* Copyright (c) 2003, PostgreSQL Global Development Group
*
- * $PostgreSQL: pgsql/src/include/utils/errcodes.h,v 1.13 2004/07/27 05:11:35 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/utils/errcodes.h,v 1.14 2004/07/31 07:39:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -326,6 +326,10 @@
#define ERRCODE_CONFIG_FILE_ERROR MAKE_SQLSTATE('F','0', '0','0','0')
#define ERRCODE_LOCK_FILE_EXISTS MAKE_SQLSTATE('F','0', '0','0','1')
+/* Class P0 - PL/pgSQL Error (PostgreSQL-specific error class) */
+#define ERRCODE_PLPGSQL_ERROR MAKE_SQLSTATE('P','0', '0','0','0')
+#define ERRCODE_RAISE_EXCEPTION MAKE_SQLSTATE('P','0', '0','0','1')
+
/* Class XX - Internal Error (PostgreSQL-specific error class) */
/* (this is for "can't-happen" conditions and software bugs) */
#define ERRCODE_INTERNAL_ERROR MAKE_SQLSTATE('X','X', '0','0','0')
diff --git a/src/pl/plpgsql/src/gram.y b/src/pl/plpgsql/src/gram.y
index 9b70d944ab9..628c81b570b 100644
--- a/src/pl/plpgsql/src/gram.y
+++ b/src/pl/plpgsql/src/gram.y
@@ -4,7 +4,7 @@
* procedural language
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/pl/plpgsql/src/gram.y,v 1.57 2004/07/04 02:49:04 tgl Exp $
+ * $PostgreSQL: pgsql/src/pl/plpgsql/src/gram.y,v 1.58 2004/07/31 07:39:20 tgl Exp $
*
* This software is copyrighted by Jan Wieck - Hamburg.
*
@@ -96,6 +96,8 @@ static void check_assignable(PLpgSQL_datum *datum);
PLpgSQL_stmt *stmt;
PLpgSQL_stmts *stmts;
PLpgSQL_stmt_block *program;
+ PLpgSQL_exception *exception;
+ PLpgSQL_exceptions *exceptions;
PLpgSQL_nsitem *nsitem;
}
@@ -131,6 +133,9 @@ static void check_assignable(PLpgSQL_datum *datum);
%type <stmt> stmt_dynexecute stmt_getdiag
%type <stmt> stmt_open stmt_fetch stmt_close
+%type <exceptions> exception_sect proc_exceptions
+%type <exception> proc_exception
+
%type <intlist> raise_params
%type <ival> raise_level raise_param
%type <str> raise_msg
@@ -240,7 +245,7 @@ opt_semi :
| ';'
;
-pl_block : decl_sect K_BEGIN lno proc_sect K_END
+pl_block : decl_sect K_BEGIN lno proc_sect exception_sect K_END
{
PLpgSQL_stmt_block *new;
@@ -253,6 +258,7 @@ pl_block : decl_sect K_BEGIN lno proc_sect K_END
new->n_initvars = $1.n_initvars;
new->initvarnos = $1.initvarnos;
new->body = $4;
+ new->exceptions = $5;
plpgsql_ns_pop();
@@ -588,7 +594,7 @@ proc_stmts : proc_stmts proc_stmt
$1->stmts_alloc *= 2;
$1->stmts = realloc($1->stmts, sizeof(PLpgSQL_stmt *) * $1->stmts_alloc);
}
- $1->stmts[$1->stmts_used++] = (struct PLpgSQL_stmt *)$2;
+ $1->stmts[$1->stmts_used++] = $2;
$$ = $1;
}
@@ -602,7 +608,7 @@ proc_stmts : proc_stmts proc_stmt
new->stmts_alloc = 64;
new->stmts_used = 1;
new->stmts = malloc(sizeof(PLpgSQL_stmt *) * new->stmts_alloc);
- new->stmts[0] = (struct PLpgSQL_stmt *)$1;
+ new->stmts[0] = $1;
$$ = new;
@@ -832,7 +838,7 @@ stmt_else :
new->stmts_alloc = 64;
new->stmts_used = 1;
new->stmts = malloc(sizeof(PLpgSQL_stmt *) * new->stmts_alloc);
- new->stmts[0] = (struct PLpgSQL_stmt *)new_if;
+ new->stmts[0] = (PLpgSQL_stmt *) new_if;
$$ = new;
@@ -1524,6 +1530,54 @@ execsql_start : T_WORD
{ $$ = strdup(yytext); }
;
+exception_sect :
+ { $$ = NULL; }
+ | K_EXCEPTION proc_exceptions
+ { $$ = $2; }
+ ;
+
+proc_exceptions : proc_exceptions proc_exception
+ {
+ if ($1->exceptions_used == $1->exceptions_alloc)
+ {
+ $1->exceptions_alloc *= 2;
+ $1->exceptions = realloc($1->exceptions, sizeof(PLpgSQL_exception *) * $1->exceptions_alloc);
+ }
+ $1->exceptions[$1->exceptions_used++] = $2;
+
+ $$ = $1;
+ }
+ | proc_exception
+ {
+ PLpgSQL_exceptions *new;
+
+ new = malloc(sizeof(PLpgSQL_exceptions));
+ memset(new, 0, sizeof(PLpgSQL_exceptions));
+
+ new->exceptions_alloc = 64;
+ new->exceptions_used = 1;
+ new->exceptions = malloc(sizeof(PLpgSQL_exception *) * new->exceptions_alloc);
+ new->exceptions[0] = $1;
+
+ $$ = new;
+ }
+ ;
+
+proc_exception : K_WHEN lno opt_lblname K_THEN proc_sect
+ {
+ PLpgSQL_exception *new;
+
+ new = malloc(sizeof(PLpgSQL_exception));
+ memset(new, 0, sizeof(PLpgSQL_exception));
+
+ new->lineno = $2;
+ new->label = $3;
+ new->action = $5;
+
+ $$ = new;
+ }
+ ;
+
expr_until_semi :
{ $$ = plpgsql_read_expression(';', ";"); }
;
diff --git a/src/pl/plpgsql/src/pl_exec.c b/src/pl/plpgsql/src/pl_exec.c
index d6f8c6835cc..d8befe4d529 100644
--- a/src/pl/plpgsql/src/pl_exec.c
+++ b/src/pl/plpgsql/src/pl_exec.c
@@ -3,7 +3,7 @@
* procedural language
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.108 2004/07/31 00:45:46 tgl Exp $
+ * $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.109 2004/07/31 07:39:20 tgl Exp $
*
* This software is copyrighted by Jan Wieck - Hamburg.
*
@@ -56,6 +56,16 @@
static const char *const raise_skip_msg = "RAISE";
+typedef struct {
+ const char *label;
+ int sqlerrstate;
+} ExceptionLabelMap;
+
+static const ExceptionLabelMap exception_label_map[] = {
+#include "plerrcodes.h"
+ { NULL, 0 }
+};
+
/*
* All plpgsql function executions within a single transaction share
* the same executor EState for evaluating "simple" expressions. Each
@@ -784,6 +794,32 @@ copy_rec(PLpgSQL_rec * rec)
}
+static bool
+exception_matches_label(ErrorData *edata, const char *label)
+{
+ int i;
+
+ /*
+ * OTHERS matches everything *except* query-canceled;
+ * if you're foolish enough, you can match that explicitly.
+ */
+ if (pg_strcasecmp(label, "OTHERS") == 0)
+ {
+ if (edata->sqlerrcode == ERRCODE_QUERY_CANCELED)
+ return false;
+ else
+ return true;
+ }
+ for (i = 0; exception_label_map[i].label != NULL; i++)
+ {
+ if (pg_strcasecmp(label, exception_label_map[i].label) == 0)
+ return (edata->sqlerrcode == exception_label_map[i].sqlerrstate);
+ }
+ /* Should we raise an error if label is unrecognized?? */
+ return false;
+}
+
+
/* ----------
* exec_stmt_block Execute a block of statements
* ----------
@@ -791,7 +827,7 @@ copy_rec(PLpgSQL_rec * rec)
static int
exec_stmt_block(PLpgSQL_execstate * estate, PLpgSQL_stmt_block * block)
{
- int rc;
+ volatile int rc = -1;
int i;
int n;
@@ -859,13 +895,86 @@ exec_stmt_block(PLpgSQL_execstate * estate, PLpgSQL_stmt_block * block)
elog(ERROR, "unrecognized dtype: %d",
estate->datums[n]->dtype);
}
-
}
- /*
- * Execute the statements in the block's body
- */
- rc = exec_stmts(estate, block->body);
+ if (block->exceptions)
+ {
+ /*
+ * Execute the statements in the block's body inside a sub-transaction
+ */
+ MemoryContext oldcontext = CurrentMemoryContext;
+ volatile bool caught = false;
+
+ /*
+ * Start a subtransaction, and re-connect to SPI within it
+ */
+ SPI_push();
+ BeginInternalSubTransaction(NULL);
+ /* Want to run statements inside function's memory context */
+ MemoryContextSwitchTo(oldcontext);
+ if (SPI_connect() != SPI_OK_CONNECT)
+ elog(ERROR, "SPI_connect failed");
+
+ PG_TRY();
+ {
+ rc = exec_stmts(estate, block->body);
+ }
+ PG_CATCH();
+ {
+ ErrorData *edata;
+ PLpgSQL_exceptions *exceptions;
+ int j;
+
+ /* Save error info */
+ MemoryContextSwitchTo(oldcontext);
+ edata = CopyErrorData();
+ FlushErrorState();
+
+ /* Abort the inner transaction (and inner SPI connection) */
+ RollbackAndReleaseCurrentSubTransaction();
+ MemoryContextSwitchTo(oldcontext);
+
+ SPI_pop();
+
+ /* Look for a matching exception handler */
+ exceptions = block->exceptions;
+ for (j = 0; j < exceptions->exceptions_used; j++)
+ {
+ PLpgSQL_exception *exception = exceptions->exceptions[j];
+
+ if (exception_matches_label(edata, exception->label))
+ {
+ rc = exec_stmts(estate, exception->action);
+ break;
+ }
+ }
+
+ /* If no match found, re-throw the error */
+ if (j >= exceptions->exceptions_used)
+ ReThrowError(edata);
+ else
+ FreeErrorData(edata);
+ caught = true;
+ }
+ PG_END_TRY();
+
+ /* Commit the inner transaction, return to outer xact context */
+ if (!caught)
+ {
+ if (SPI_finish() != SPI_OK_FINISH)
+ elog(ERROR, "SPI_finish failed");
+ ReleaseCurrentSubTransaction();
+ MemoryContextSwitchTo(oldcontext);
+ SPI_pop();
+ }
+ }
+ else
+ {
+ /*
+ * Just execute the statements in the block's body
+ */
+ rc = exec_stmts(estate, block->body);
+ }
/*
* Handle the return code.
@@ -909,7 +1018,7 @@ exec_stmts(PLpgSQL_execstate * estate, PLpgSQL_stmts * stmts)
for (i = 0; i < stmts->stmts_used; i++)
{
- rc = exec_stmt(estate, (PLpgSQL_stmt *) (stmts->stmts[i]));
+ rc = exec_stmt(estate, stmts->stmts[i]);
if (rc != PLPGSQL_RC_OK)
return rc;
}
@@ -1852,7 +1961,8 @@ exec_stmt_raise(PLpgSQL_execstate * estate, PLpgSQL_stmt_raise * stmt)
estate->err_text = raise_skip_msg; /* suppress traceback of raise */
ereport(stmt->elog_level,
- (errmsg_internal("%s", plpgsql_dstring_get(&ds))));
+ ((stmt->elog_level >= ERROR) ? errcode(ERRCODE_RAISE_EXCEPTION) : 0,
+ errmsg_internal("%s", plpgsql_dstring_get(&ds))));
estate->err_text = NULL; /* un-suppress... */
diff --git a/src/pl/plpgsql/src/pl_funcs.c b/src/pl/plpgsql/src/pl_funcs.c
index f49a2ac500c..b4649067522 100644
--- a/src/pl/plpgsql/src/pl_funcs.c
+++ b/src/pl/plpgsql/src/pl_funcs.c
@@ -3,7 +3,7 @@
* procedural language
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_funcs.c,v 1.32 2004/02/21 00:34:53 tgl Exp $
+ * $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_funcs.c,v 1.33 2004/07/31 07:39:20 tgl Exp $
*
* This software is copyrighted by Jan Wieck - Hamburg.
*
@@ -584,6 +584,17 @@ dump_stmt(PLpgSQL_stmt * stmt)
}
static void
+dump_stmts(PLpgSQL_stmts * stmts)
+{
+ int i;
+
+ dump_indent += 2;
+ for (i = 0; i < stmts->stmts_used; i++)
+ dump_stmt(stmts->stmts[i]);
+ dump_indent -= 2;
+}
+
+static void
dump_block(PLpgSQL_stmt_block * block)
{
int i;
@@ -597,10 +608,19 @@ dump_block(PLpgSQL_stmt_block * block)
dump_ind();
printf("BLOCK <<%s>>\n", name);
- dump_indent += 2;
- for (i = 0; i < block->body->stmts_used; i++)
- dump_stmt((PLpgSQL_stmt *) (block->body->stmts[i]));
- dump_indent -= 2;
+ dump_stmts(block->body);
+
+ if (block->exceptions)
+ {
+ for (i = 0; i < block->exceptions->exceptions_used; i++)
+ {
+ PLpgSQL_exception *exc = block->exceptions->exceptions[i];
+
+ dump_ind();
+ printf(" EXCEPTION WHEN %s THEN\n", exc->label);
+ dump_stmts(exc->action);
+ }
+ }
dump_ind();
printf(" END -- %s\n", name);
@@ -618,25 +638,17 @@ dump_assign(PLpgSQL_stmt_assign * stmt)
static void
dump_if(PLpgSQL_stmt_if * stmt)
{
- int i;
-
dump_ind();
printf("IF ");
dump_expr(stmt->cond);
printf(" THEN\n");
- dump_indent += 2;
- for (i = 0; i < stmt->true_body->stmts_used; i++)
- dump_stmt((PLpgSQL_stmt *) (stmt->true_body->stmts[i]));
- dump_indent -= 2;
+ dump_stmts(stmt->true_body);
dump_ind();
printf(" ELSE\n");
- dump_indent += 2;
- for (i = 0; i < stmt->false_body->stmts_used; i++)
- dump_stmt((PLpgSQL_stmt *) (stmt->false_body->stmts[i]));
- dump_indent -= 2;
+ dump_stmts(stmt->false_body);
dump_ind();
printf(" ENDIF\n");
@@ -645,15 +657,10 @@ dump_if(PLpgSQL_stmt_if * stmt)
static void
dump_loop(PLpgSQL_stmt_loop * stmt)
{
- int i;
-
dump_ind();
printf("LOOP\n");
- dump_indent += 2;
- for (i = 0; i < stmt->body->stmts_used; i++)
- dump_stmt((PLpgSQL_stmt *) (stmt->body->stmts[i]));
- dump_indent -= 2;
+ dump_stmts(stmt->body);
dump_ind();
printf(" ENDLOOP\n");
@@ -662,17 +669,12 @@ dump_loop(PLpgSQL_stmt_loop * stmt)
static void
dump_while(PLpgSQL_stmt_while * stmt)
{
- int i;
-
dump_ind();
printf("WHILE ");
dump_expr(stmt->cond);
printf("\n");
- dump_indent += 2;
- for (i = 0; i < stmt->body->stmts_used; i++)
- dump_stmt((PLpgSQL_stmt *) (stmt->body->stmts[i]));
- dump_indent -= 2;
+ dump_stmts(stmt->body);
dump_ind();
printf(" ENDWHILE\n");
@@ -681,8 +683,6 @@ dump_while(PLpgSQL_stmt_while * stmt)
static void
dump_fori(PLpgSQL_stmt_fori * stmt)
{
- int i;
-
dump_ind();
printf("FORI %s %s\n", stmt->var->refname, (stmt->reverse) ? "REVERSE" : "NORMAL");
@@ -695,11 +695,10 @@ dump_fori(PLpgSQL_stmt_fori * stmt)
printf(" upper = ");
dump_expr(stmt->upper);
printf("\n");
-
- for (i = 0; i < stmt->body->stmts_used; i++)
- dump_stmt((PLpgSQL_stmt *) (stmt->body->stmts[i]));
dump_indent -= 2;
+ dump_stmts(stmt->body);
+
dump_ind();
printf(" ENDFORI\n");
}
@@ -707,17 +706,12 @@ dump_fori(PLpgSQL_stmt_fori * stmt)
static void
dump_fors(PLpgSQL_stmt_fors * stmt)
{
- int i;
-
dump_ind();
printf("FORS %s ", (stmt->rec != NULL) ? stmt->rec->refname : stmt->row->refname);
dump_expr(stmt->query);
printf("\n");
- dump_indent += 2;
- for (i = 0; i < stmt->body->stmts_used; i++)
- dump_stmt((PLpgSQL_stmt *) (stmt->body->stmts[i]));
- dump_indent -= 2;
+ dump_stmts(stmt->body);
dump_ind();
printf(" ENDFORS\n");
@@ -891,17 +885,12 @@ dump_dynexecute(PLpgSQL_stmt_dynexecute * stmt)
static void
dump_dynfors(PLpgSQL_stmt_dynfors * stmt)
{
- int i;
-
dump_ind();
printf("FORS %s EXECUTE ", (stmt->rec != NULL) ? stmt->rec->refname : stmt->row->refname);
dump_expr(stmt->query);
printf("\n");
- dump_indent += 2;
- for (i = 0; i < stmt->body->stmts_used; i++)
- dump_stmt((PLpgSQL_stmt *) (stmt->body->stmts[i]));
- dump_indent -= 2;
+ dump_stmts(stmt->body);
dump_ind();
printf(" ENDFORS\n");
@@ -1051,4 +1040,5 @@ plpgsql_dumptree(PLpgSQL_function * func)
printf("%3d:", func->action->lineno);
dump_block(func->action);
printf("\nEnd of execution tree of function %s\n\n", func->fn_name);
+ fflush(stdout);
}
diff --git a/src/pl/plpgsql/src/plerrcodes.h b/src/pl/plpgsql/src/plerrcodes.h
new file mode 100644
index 00000000000..4e76bde6739
--- /dev/null
+++ b/src/pl/plpgsql/src/plerrcodes.h
@@ -0,0 +1,203 @@
+/*-------------------------------------------------------------------------
+ *
+ * plerrcodes.h
+ * PL/pgSQL error codes (mapping of exception labels to SQLSTATEs)
+ *
+ * Eventually this header file should be auto-generated from errcodes.h
+ * with some sort of sed hackery, but no time for that now. It's likely
+ * that an exact mapping will not be what's wanted anyhow ...
+ *
+ * Copyright (c) 2003, PostgreSQL Global Development Group
+ *
+ * $PostgreSQL: pgsql/src/pl/plpgsql/src/plerrcodes.h,v 1.1 2004/07/31 07:39:20 tgl Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+
+{ "SUCCESSFUL_COMPLETION", ERRCODE_SUCCESSFUL_COMPLETION },
+{ "WARNING", ERRCODE_WARNING },
+{ "WARNING_DYNAMIC_RESULT_SETS_RETURNED", ERRCODE_WARNING_DYNAMIC_RESULT_SETS_RETURNED },
+{ "WARNING_IMPLICIT_ZERO_BIT_PADDING", ERRCODE_WARNING_IMPLICIT_ZERO_BIT_PADDING },
+{ "WARNING_NULL_VALUE_ELIMINATED_IN_SET_FUNCTION", ERRCODE_WARNING_NULL_VALUE_ELIMINATED_IN_SET_FUNCTION },
+{ "WARNING_PRIVILEGE_NOT_GRANTED", ERRCODE_WARNING_PRIVILEGE_NOT_GRANTED },
+{ "WARNING_PRIVILEGE_NOT_REVOKED", ERRCODE_WARNING_PRIVILEGE_NOT_REVOKED },
+{ "WARNING_STRING_DATA_RIGHT_TRUNCATION", ERRCODE_WARNING_STRING_DATA_RIGHT_TRUNCATION },
+{ "WARNING_DEPRECATED_FEATURE", ERRCODE_WARNING_DEPRECATED_FEATURE },
+{ "NO_DATA", ERRCODE_NO_DATA },
+{ "NO_ADDITIONAL_DYNAMIC_RESULT_SETS_RETURNED", ERRCODE_NO_ADDITIONAL_DYNAMIC_RESULT_SETS_RETURNED },
+{ "SQL_STATEMENT_NOT_YET_COMPLETE", ERRCODE_SQL_STATEMENT_NOT_YET_COMPLETE },
+{ "CONNECTION_EXCEPTION", ERRCODE_CONNECTION_EXCEPTION },
+{ "CONNECTION_DOES_NOT_EXIST", ERRCODE_CONNECTION_DOES_NOT_EXIST },
+{ "CONNECTION_FAILURE", ERRCODE_CONNECTION_FAILURE },
+{ "SQLCLIENT_UNABLE_TO_ESTABLISH_SQLCONNECTION", ERRCODE_SQLCLIENT_UNABLE_TO_ESTABLISH_SQLCONNECTION },
+{ "SQLSERVER_REJECTED_ESTABLISHMENT_OF_SQLCONNECTION", ERRCODE_SQLSERVER_REJECTED_ESTABLISHMENT_OF_SQLCONNECTION },
+{ "TRANSACTION_RESOLUTION_UNKNOWN", ERRCODE_TRANSACTION_RESOLUTION_UNKNOWN },
+{ "PROTOCOL_VIOLATION", ERRCODE_PROTOCOL_VIOLATION },
+{ "TRIGGERED_ACTION_EXCEPTION", ERRCODE_TRIGGERED_ACTION_EXCEPTION },
+{ "FEATURE_NOT_SUPPORTED", ERRCODE_FEATURE_NOT_SUPPORTED },
+{ "INVALID_TRANSACTION_INITIATION", ERRCODE_INVALID_TRANSACTION_INITIATION },
+{ "LOCATOR_EXCEPTION", ERRCODE_LOCATOR_EXCEPTION },
+{ "L_E_INVALID_SPECIFICATION", ERRCODE_L_E_INVALID_SPECIFICATION },
+{ "INVALID_GRANTOR", ERRCODE_INVALID_GRANTOR },
+{ "INVALID_GRANT_OPERATION", ERRCODE_INVALID_GRANT_OPERATION },
+{ "INVALID_ROLE_SPECIFICATION", ERRCODE_INVALID_ROLE_SPECIFICATION },
+{ "CARDINALITY_VIOLATION", ERRCODE_CARDINALITY_VIOLATION },
+{ "DATA_EXCEPTION", ERRCODE_DATA_EXCEPTION },
+{ "ARRAY_ELEMENT_ERROR", ERRCODE_ARRAY_ELEMENT_ERROR },
+{ "ARRAY_SUBSCRIPT_ERROR", ERRCODE_ARRAY_SUBSCRIPT_ERROR },
+{ "CHARACTER_NOT_IN_REPERTOIRE", ERRCODE_CHARACTER_NOT_IN_REPERTOIRE },
+{ "DATETIME_FIELD_OVERFLOW", ERRCODE_DATETIME_FIELD_OVERFLOW },
+{ "DATETIME_VALUE_OUT_OF_RANGE", ERRCODE_DATETIME_VALUE_OUT_OF_RANGE },
+{ "DIVISION_BY_ZERO", ERRCODE_DIVISION_BY_ZERO },
+{ "ERROR_IN_ASSIGNMENT", ERRCODE_ERROR_IN_ASSIGNMENT },
+{ "ESCAPE_CHARACTER_CONFLICT", ERRCODE_ESCAPE_CHARACTER_CONFLICT },
+{ "INDICATOR_OVERFLOW", ERRCODE_INDICATOR_OVERFLOW },
+{ "INTERVAL_FIELD_OVERFLOW", ERRCODE_INTERVAL_FIELD_OVERFLOW },
+{ "INVALID_ARGUMENT_FOR_LOG", ERRCODE_INVALID_ARGUMENT_FOR_LOG },
+{ "INVALID_ARGUMENT_FOR_POWER_FUNCTION", ERRCODE_INVALID_ARGUMENT_FOR_POWER_FUNCTION },
+{ "INVALID_ARGUMENT_FOR_WIDTH_BUCKET_FUNCTION", ERRCODE_INVALID_ARGUMENT_FOR_WIDTH_BUCKET_FUNCTION },
+{ "INVALID_CHARACTER_VALUE_FOR_CAST", ERRCODE_INVALID_CHARACTER_VALUE_FOR_CAST },
+{ "INVALID_DATETIME_FORMAT", ERRCODE_INVALID_DATETIME_FORMAT },
+{ "INVALID_ESCAPE_CHARACTER", ERRCODE_INVALID_ESCAPE_CHARACTER },
+{ "INVALID_ESCAPE_OCTET", ERRCODE_INVALID_ESCAPE_OCTET },
+{ "INVALID_ESCAPE_SEQUENCE", ERRCODE_INVALID_ESCAPE_SEQUENCE },
+{ "INVALID_INDICATOR_PARAMETER_VALUE", ERRCODE_INVALID_INDICATOR_PARAMETER_VALUE },
+{ "INVALID_LIMIT_VALUE", ERRCODE_INVALID_LIMIT_VALUE },
+{ "INVALID_PARAMETER_VALUE", ERRCODE_INVALID_PARAMETER_VALUE },
+{ "INVALID_REGULAR_EXPRESSION", ERRCODE_INVALID_REGULAR_EXPRESSION },
+{ "INVALID_TIME_ZONE_DISPLACEMENT_VALUE", ERRCODE_INVALID_TIME_ZONE_DISPLACEMENT_VALUE },
+{ "INVALID_USE_OF_ESCAPE_CHARACTER", ERRCODE_INVALID_USE_OF_ESCAPE_CHARACTER },
+{ "MOST_SPECIFIC_TYPE_MISMATCH", ERRCODE_MOST_SPECIFIC_TYPE_MISMATCH },
+{ "NULL_VALUE_NOT_ALLOWED", ERRCODE_NULL_VALUE_NOT_ALLOWED },
+{ "NULL_VALUE_NO_INDICATOR_PARAMETER", ERRCODE_NULL_VALUE_NO_INDICATOR_PARAMETER },
+{ "NUMERIC_VALUE_OUT_OF_RANGE", ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE },
+{ "STRING_DATA_LENGTH_MISMATCH", ERRCODE_STRING_DATA_LENGTH_MISMATCH },
+{ "STRING_DATA_RIGHT_TRUNCATION", ERRCODE_STRING_DATA_RIGHT_TRUNCATION },
+{ "SUBSTRING_ERROR", ERRCODE_SUBSTRING_ERROR },
+{ "TRIM_ERROR", ERRCODE_TRIM_ERROR },
+{ "UNTERMINATED_C_STRING", ERRCODE_UNTERMINATED_C_STRING },
+{ "ZERO_LENGTH_CHARACTER_STRING", ERRCODE_ZERO_LENGTH_CHARACTER_STRING },
+{ "FLOATING_POINT_EXCEPTION", ERRCODE_FLOATING_POINT_EXCEPTION },
+{ "INVALID_TEXT_REPRESENTATION", ERRCODE_INVALID_TEXT_REPRESENTATION },
+{ "INVALID_BINARY_REPRESENTATION", ERRCODE_INVALID_BINARY_REPRESENTATION },
+{ "BAD_COPY_FILE_FORMAT", ERRCODE_BAD_COPY_FILE_FORMAT },
+{ "UNTRANSLATABLE_CHARACTER", ERRCODE_UNTRANSLATABLE_CHARACTER },
+{ "INTEGRITY_CONSTRAINT_VIOLATION", ERRCODE_INTEGRITY_CONSTRAINT_VIOLATION },
+{ "RESTRICT_VIOLATION", ERRCODE_RESTRICT_VIOLATION },
+{ "NOT_NULL_VIOLATION", ERRCODE_NOT_NULL_VIOLATION },
+{ "FOREIGN_KEY_VIOLATION", ERRCODE_FOREIGN_KEY_VIOLATION },
+{ "UNIQUE_VIOLATION", ERRCODE_UNIQUE_VIOLATION },
+{ "CHECK_VIOLATION", ERRCODE_CHECK_VIOLATION },
+{ "INVALID_CURSOR_STATE", ERRCODE_INVALID_CURSOR_STATE },
+{ "INVALID_TRANSACTION_STATE", ERRCODE_INVALID_TRANSACTION_STATE },
+{ "ACTIVE_SQL_TRANSACTION", ERRCODE_ACTIVE_SQL_TRANSACTION },
+{ "BRANCH_TRANSACTION_ALREADY_ACTIVE", ERRCODE_BRANCH_TRANSACTION_ALREADY_ACTIVE },
+{ "HELD_CURSOR_REQUIRES_SAME_ISOLATION_LEVEL", ERRCODE_HELD_CURSOR_REQUIRES_SAME_ISOLATION_LEVEL },
+{ "INAPPROPRIATE_ACCESS_MODE_FOR_BRANCH_TRANSACTION", ERRCODE_INAPPROPRIATE_ACCESS_MODE_FOR_BRANCH_TRANSACTION },
+{ "INAPPROPRIATE_ISOLATION_LEVEL_FOR_BRANCH_TRANSACTION", ERRCODE_INAPPROPRIATE_ISOLATION_LEVEL_FOR_BRANCH_TRANSACTION },
+{ "NO_ACTIVE_SQL_TRANSACTION_FOR_BRANCH_TRANSACTION", ERRCODE_NO_ACTIVE_SQL_TRANSACTION_FOR_BRANCH_TRANSACTION },
+{ "READ_ONLY_SQL_TRANSACTION", ERRCODE_READ_ONLY_SQL_TRANSACTION },
+{ "SCHEMA_AND_DATA_STATEMENT_MIXING_NOT_SUPPORTED", ERRCODE_SCHEMA_AND_DATA_STATEMENT_MIXING_NOT_SUPPORTED },
+{ "NO_ACTIVE_SQL_TRANSACTION", ERRCODE_NO_ACTIVE_SQL_TRANSACTION },
+{ "IN_FAILED_SQL_TRANSACTION", ERRCODE_IN_FAILED_SQL_TRANSACTION },
+{ "INVALID_SQL_STATEMENT_NAME", ERRCODE_INVALID_SQL_STATEMENT_NAME },
+{ "TRIGGERED_DATA_CHANGE_VIOLATION", ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION },
+{ "INVALID_AUTHORIZATION_SPECIFICATION", ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION },
+{ "DEPENDENT_PRIVILEGE_DESCRIPTORS_STILL_EXIST", ERRCODE_DEPENDENT_PRIVILEGE_DESCRIPTORS_STILL_EXIST },
+{ "DEPENDENT_OBJECTS_STILL_EXIST", ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST },
+{ "INVALID_TRANSACTION_TERMINATION", ERRCODE_INVALID_TRANSACTION_TERMINATION },
+{ "SQL_ROUTINE_EXCEPTION", ERRCODE_SQL_ROUTINE_EXCEPTION },
+{ "S_R_E_FUNCTION_EXECUTED_NO_RETURN_STATEMENT", ERRCODE_S_R_E_FUNCTION_EXECUTED_NO_RETURN_STATEMENT },
+{ "S_R_E_MODIFYING_SQL_DATA_NOT_PERMITTED", ERRCODE_S_R_E_MODIFYING_SQL_DATA_NOT_PERMITTED },
+{ "S_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED", ERRCODE_S_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED },
+{ "S_R_E_READING_SQL_DATA_NOT_PERMITTED", ERRCODE_S_R_E_READING_SQL_DATA_NOT_PERMITTED },
+{ "INVALID_CURSOR_NAME", ERRCODE_INVALID_CURSOR_NAME },
+{ "EXTERNAL_ROUTINE_EXCEPTION", ERRCODE_EXTERNAL_ROUTINE_EXCEPTION },
+{ "E_R_E_CONTAINING_SQL_NOT_PERMITTED", ERRCODE_E_R_E_CONTAINING_SQL_NOT_PERMITTED },
+{ "E_R_E_MODIFYING_SQL_DATA_NOT_PERMITTED", ERRCODE_E_R_E_MODIFYING_SQL_DATA_NOT_PERMITTED },
+{ "E_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED", ERRCODE_E_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED },
+{ "E_R_E_READING_SQL_DATA_NOT_PERMITTED", ERRCODE_E_R_E_READING_SQL_DATA_NOT_PERMITTED },
+{ "EXTERNAL_ROUTINE_INVOCATION_EXCEPTION", ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION },
+{ "E_R_I_E_INVALID_SQLSTATE_RETURNED", ERRCODE_E_R_I_E_INVALID_SQLSTATE_RETURNED },
+{ "E_R_I_E_NULL_VALUE_NOT_ALLOWED", ERRCODE_E_R_I_E_NULL_VALUE_NOT_ALLOWED },
+{ "E_R_I_E_TRIGGER_PROTOCOL_VIOLATED", ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED },
+{ "E_R_I_E_SRF_PROTOCOL_VIOLATED", ERRCODE_E_R_I_E_SRF_PROTOCOL_VIOLATED },
+{ "SAVEPOINT_EXCEPTION", ERRCODE_SAVEPOINT_EXCEPTION },
+{ "S_E_INVALID_SPECIFICATION", ERRCODE_S_E_INVALID_SPECIFICATION },
+{ "INVALID_CATALOG_NAME", ERRCODE_INVALID_CATALOG_NAME },
+{ "INVALID_SCHEMA_NAME", ERRCODE_INVALID_SCHEMA_NAME },
+{ "TRANSACTION_ROLLBACK", ERRCODE_TRANSACTION_ROLLBACK },
+{ "T_R_INTEGRITY_CONSTRAINT_VIOLATION", ERRCODE_T_R_INTEGRITY_CONSTRAINT_VIOLATION },
+{ "T_R_SERIALIZATION_FAILURE", ERRCODE_T_R_SERIALIZATION_FAILURE },
+{ "T_R_STATEMENT_COMPLETION_UNKNOWN", ERRCODE_T_R_STATEMENT_COMPLETION_UNKNOWN },
+{ "T_R_DEADLOCK_DETECTED", ERRCODE_T_R_DEADLOCK_DETECTED },
+{ "SYNTAX_ERROR_OR_ACCESS_RULE_VIOLATION", ERRCODE_SYNTAX_ERROR_OR_ACCESS_RULE_VIOLATION },
+{ "SYNTAX_ERROR", ERRCODE_SYNTAX_ERROR },
+{ "INSUFFICIENT_PRIVILEGE", ERRCODE_INSUFFICIENT_PRIVILEGE },
+{ "CANNOT_COERCE", ERRCODE_CANNOT_COERCE },
+{ "GROUPING_ERROR", ERRCODE_GROUPING_ERROR },
+{ "INVALID_FOREIGN_KEY", ERRCODE_INVALID_FOREIGN_KEY },
+{ "INVALID_NAME", ERRCODE_INVALID_NAME },
+{ "NAME_TOO_LONG", ERRCODE_NAME_TOO_LONG },
+{ "RESERVED_NAME", ERRCODE_RESERVED_NAME },
+{ "DATATYPE_MISMATCH", ERRCODE_DATATYPE_MISMATCH },
+{ "INDETERMINATE_DATATYPE", ERRCODE_INDETERMINATE_DATATYPE },
+{ "WRONG_OBJECT_TYPE", ERRCODE_WRONG_OBJECT_TYPE },
+{ "UNDEFINED_COLUMN", ERRCODE_UNDEFINED_COLUMN },
+{ "UNDEFINED_CURSOR", ERRCODE_UNDEFINED_CURSOR },
+{ "UNDEFINED_DATABASE", ERRCODE_UNDEFINED_DATABASE },
+{ "UNDEFINED_FUNCTION", ERRCODE_UNDEFINED_FUNCTION },
+{ "UNDEFINED_PSTATEMENT", ERRCODE_UNDEFINED_PSTATEMENT },
+{ "UNDEFINED_SCHEMA", ERRCODE_UNDEFINED_SCHEMA },
+{ "UNDEFINED_TABLE", ERRCODE_UNDEFINED_TABLE },
+{ "UNDEFINED_PARAMETER", ERRCODE_UNDEFINED_PARAMETER },
+{ "UNDEFINED_OBJECT", ERRCODE_UNDEFINED_OBJECT },
+{ "DUPLICATE_COLUMN", ERRCODE_DUPLICATE_COLUMN },
+{ "DUPLICATE_CURSOR", ERRCODE_DUPLICATE_CURSOR },
+{ "DUPLICATE_DATABASE", ERRCODE_DUPLICATE_DATABASE },
+{ "DUPLICATE_FUNCTION", ERRCODE_DUPLICATE_FUNCTION },
+{ "DUPLICATE_PSTATEMENT", ERRCODE_DUPLICATE_PSTATEMENT },
+{ "DUPLICATE_SCHEMA", ERRCODE_DUPLICATE_SCHEMA },
+{ "DUPLICATE_TABLE", ERRCODE_DUPLICATE_TABLE },
+{ "DUPLICATE_ALIAS", ERRCODE_DUPLICATE_ALIAS },
+{ "DUPLICATE_OBJECT", ERRCODE_DUPLICATE_OBJECT },
+{ "AMBIGUOUS_COLUMN", ERRCODE_AMBIGUOUS_COLUMN },
+{ "AMBIGUOUS_FUNCTION", ERRCODE_AMBIGUOUS_FUNCTION },
+{ "AMBIGUOUS_PARAMETER", ERRCODE_AMBIGUOUS_PARAMETER },
+{ "AMBIGUOUS_ALIAS", ERRCODE_AMBIGUOUS_ALIAS },
+{ "INVALID_COLUMN_REFERENCE", ERRCODE_INVALID_COLUMN_REFERENCE },
+{ "INVALID_COLUMN_DEFINITION", ERRCODE_INVALID_COLUMN_DEFINITION },
+{ "INVALID_CURSOR_DEFINITION", ERRCODE_INVALID_CURSOR_DEFINITION },
+{ "INVALID_DATABASE_DEFINITION", ERRCODE_INVALID_DATABASE_DEFINITION },
+{ "INVALID_FUNCTION_DEFINITION", ERRCODE_INVALID_FUNCTION_DEFINITION },
+{ "INVALID_PSTATEMENT_DEFINITION", ERRCODE_INVALID_PSTATEMENT_DEFINITION },
+{ "INVALID_SCHEMA_DEFINITION", ERRCODE_INVALID_SCHEMA_DEFINITION },
+{ "INVALID_TABLE_DEFINITION", ERRCODE_INVALID_TABLE_DEFINITION },
+{ "INVALID_OBJECT_DEFINITION", ERRCODE_INVALID_OBJECT_DEFINITION },
+{ "WITH_CHECK_OPTION_VIOLATION", ERRCODE_WITH_CHECK_OPTION_VIOLATION },
+{ "INSUFFICIENT_RESOURCES", ERRCODE_INSUFFICIENT_RESOURCES },
+{ "DISK_FULL", ERRCODE_DISK_FULL },
+{ "OUT_OF_MEMORY", ERRCODE_OUT_OF_MEMORY },
+{ "TOO_MANY_CONNECTIONS", ERRCODE_TOO_MANY_CONNECTIONS },
+{ "PROGRAM_LIMIT_EXCEEDED", ERRCODE_PROGRAM_LIMIT_EXCEEDED },
+{ "STATEMENT_TOO_COMPLEX", ERRCODE_STATEMENT_TOO_COMPLEX },
+{ "TOO_MANY_COLUMNS", ERRCODE_TOO_MANY_COLUMNS },
+{ "TOO_MANY_ARGUMENTS", ERRCODE_TOO_MANY_ARGUMENTS },
+{ "OBJECT_NOT_IN_PREREQUISITE_STATE", ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE },
+{ "OBJECT_IN_USE", ERRCODE_OBJECT_IN_USE },
+{ "CANT_CHANGE_RUNTIME_PARAM", ERRCODE_CANT_CHANGE_RUNTIME_PARAM },
+{ "OPERATOR_INTERVENTION", ERRCODE_OPERATOR_INTERVENTION },
+{ "QUERY_CANCELED", ERRCODE_QUERY_CANCELED },
+{ "ADMIN_SHUTDOWN", ERRCODE_ADMIN_SHUTDOWN },
+{ "CRASH_SHUTDOWN", ERRCODE_CRASH_SHUTDOWN },
+{ "CANNOT_CONNECT_NOW", ERRCODE_CANNOT_CONNECT_NOW },
+{ "IO_ERROR", ERRCODE_IO_ERROR },
+{ "UNDEFINED_FILE", ERRCODE_UNDEFINED_FILE },
+{ "DUPLICATE_FILE", ERRCODE_DUPLICATE_FILE },
+{ "CONFIG_FILE_ERROR", ERRCODE_CONFIG_FILE_ERROR },
+{ "LOCK_FILE_EXISTS", ERRCODE_LOCK_FILE_EXISTS },
+{ "PLPGSQL_ERROR", ERRCODE_PLPGSQL_ERROR },
+{ "RAISE_EXCEPTION", ERRCODE_RAISE_EXCEPTION },
+{ "INTERNAL_ERROR", ERRCODE_INTERNAL_ERROR },
+{ "DATA_CORRUPTED", ERRCODE_DATA_CORRUPTED },
+{ "INDEX_CORRUPTED", ERRCODE_INDEX_CORRUPTED },
diff --git a/src/pl/plpgsql/src/plpgsql.h b/src/pl/plpgsql/src/plpgsql.h
index 92ece7da29d..28868cf731e 100644
--- a/src/pl/plpgsql/src/plpgsql.h
+++ b/src/pl/plpgsql/src/plpgsql.h
@@ -3,7 +3,7 @@
* procedural language
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/pl/plpgsql/src/plpgsql.h,v 1.47 2004/06/06 00:41:28 tgl Exp $
+ * $PostgreSQL: pgsql/src/pl/plpgsql/src/plpgsql.h,v 1.48 2004/07/31 07:39:20 tgl Exp $
*
* This software is copyrighted by Jan Wieck - Hamburg.
*
@@ -308,18 +308,34 @@ typedef struct PLpgSQL_ns
typedef struct
+{ /* Generic execution node */
+ int cmd_type;
+ int lineno;
+} PLpgSQL_stmt;
+
+
+typedef struct
{ /* List of execution nodes */
- int stmts_alloc;
+ int stmts_alloc; /* XXX this oughta just be a List ... */
int stmts_used;
- struct PLpgSQL_stmt **stmts;
+ PLpgSQL_stmt **stmts;
} PLpgSQL_stmts;
typedef struct
-{ /* Generic execution node */
- int cmd_type;
+{ /* One EXCEPTION ... WHEN clause */
int lineno;
-} PLpgSQL_stmt;
+ char *label;
+ PLpgSQL_stmts *action;
+} PLpgSQL_exception;
+
+
+typedef struct
+{ /* List of WHEN clauses */
+ int exceptions_alloc; /* XXX this oughta just be a List ... */
+ int exceptions_used;
+ PLpgSQL_exception **exceptions;
+} PLpgSQL_exceptions;
typedef struct
@@ -328,6 +344,7 @@ typedef struct
int lineno;
char *label;
PLpgSQL_stmts *body;
+ PLpgSQL_exceptions *exceptions;
int n_initvars;
int *initvarnos;
} PLpgSQL_stmt_block;
diff --git a/src/test/regress/expected/plpgsql.out b/src/test/regress/expected/plpgsql.out
index 694165e506a..6907905cc51 100644
--- a/src/test/regress/expected/plpgsql.out
+++ b/src/test/regress/expected/plpgsql.out
@@ -1793,3 +1793,60 @@ SELECT * FROM perform_test;
(3 rows)
drop table perform_test;
+--
+-- Test error trapping
+--
+create function trap_zero_divide(int) returns int as $$
+declare x int;
+declare sx smallint;
+begin
+ begin -- start a subtransaction
+ raise notice 'should see this';
+ x := 100 / $1;
+ raise notice 'should see this only if % <> 0', $1;
+ sx := $1;
+ raise notice 'should see this only if % fits in smallint', $1;
+ if $1 < 0 then
+ raise exception '% is less than zero', $1;
+ end if;
+ exception
+ when division_by_zero then
+ raise notice 'caught division_by_zero';
+ x := -1;
+ when NUMERIC_VALUE_OUT_OF_RANGE then
+ raise notice 'caught numeric_value_out_of_range';
+ x := -2;
+ end;
+ return x;
+end$$ language plpgsql;
+select trap_zero_divide(50);
+NOTICE: should see this
+NOTICE: should see this only if 50 <> 0
+NOTICE: should see this only if 50 fits in smallint
+ trap_zero_divide
+------------------
+ 2
+(1 row)
+
+select trap_zero_divide(0);
+NOTICE: should see this
+NOTICE: caught division_by_zero
+ trap_zero_divide
+------------------
+ -1
+(1 row)
+
+select trap_zero_divide(100000);
+NOTICE: should see this
+NOTICE: should see this only if 100000 <> 0
+NOTICE: caught numeric_value_out_of_range
+ trap_zero_divide
+------------------
+ -2
+(1 row)
+
+select trap_zero_divide(-100);
+NOTICE: should see this
+NOTICE: should see this only if -100 <> 0
+NOTICE: should see this only if -100 fits in smallint
+ERROR: -100 is less than zero
diff --git a/src/test/regress/sql/plpgsql.sql b/src/test/regress/sql/plpgsql.sql
index 9cb7f7c9407..48a78196a89 100644
--- a/src/test/regress/sql/plpgsql.sql
+++ b/src/test/regress/sql/plpgsql.sql
@@ -1608,3 +1608,36 @@ SELECT perform_test_func();
SELECT * FROM perform_test;
drop table perform_test;
+
+--
+-- Test error trapping
+--
+
+create function trap_zero_divide(int) returns int as $$
+declare x int;
+declare sx smallint;
+begin
+ begin -- start a subtransaction
+ raise notice 'should see this';
+ x := 100 / $1;
+ raise notice 'should see this only if % <> 0', $1;
+ sx := $1;
+ raise notice 'should see this only if % fits in smallint', $1;
+ if $1 < 0 then
+ raise exception '% is less than zero', $1;
+ end if;
+ exception
+ when division_by_zero then
+ raise notice 'caught division_by_zero';
+ x := -1;
+ when NUMERIC_VALUE_OUT_OF_RANGE then
+ raise notice 'caught numeric_value_out_of_range';
+ x := -2;
+ end;
+ return x;
+end$$ language plpgsql;
+
+select trap_zero_divide(50);
+select trap_zero_divide(0);
+select trap_zero_divide(100000);
+select trap_zero_divide(-100);
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-17 23:31:51 +0000