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Minor improvements to code for converting legacy CREATE CONSTRAINT TRIGGER

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commands into proper foreign-key constraints.  Believe the constraint name
given in the trigger arguments in preference to the trigger name --- to judge
from Olivier Prenant's example, pg_dump must at some time have used the
autogenerated trigger name there, though AFAICT no current release branch tip
does.  Improve the emitted NOTICEs to provide more detail (PK table's name and
column names).  Handle the case where pg_dump forgot to provide the FROM table
(a bug that never did get fixed in 7.0.x apparently).  This commit doesn't
do anything about the question of what to do with incomplete trigger groups.
REL8_3_STABLE
Tom Lane 18 years ago
parent 729d2b08c0
commit 5e0377ae7e
1 changed files with 82 additions and 35 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 117
      src/backend/commands/trigger.c

117
src/backend/commands/trigger.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/trigger.c,v 1.220 2007/11/04 01:16:19 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/trigger.c,v 1.221 2007/11/04 21:25:55 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -218,7 +218,6 @@ CreateTrigger(CreateTrigStmt *stmt, Oid constraintOid)
* constraint. Ugly, but necessary for loading old dump files.
*/
if (stmt->isconstraint && !OidIsValid(constraintOid) &&
stmt->constrrel != NULL &&
list_length(stmt->args) >= 6 &&
(list_length(stmt->args) % 2) == 0 &&
RI_FKey_trigger_type(funcoid) != RI_TRIGGER_NONE)
@ -482,9 +481,69 @@ ConvertTriggerToFK(CreateTrigStmt *stmt, Oid funcoid)
{
static List *info_list = NIL;
char *constr_name;
char *fk_table_name;
char *pk_table_name;
char fk_matchtype = FKCONSTR_MATCH_UNSPECIFIED;
List *fk_attrs = NIL;
List *pk_attrs = NIL;
StringInfoData buf;
bool isupd;
OldTriggerInfo *info = NULL;
ListCell *l;
int i;
/* Parse out the trigger arguments */
constr_name = strVal(linitial(stmt->args));
fk_table_name = strVal(lsecond(stmt->args));
pk_table_name = strVal(lthird(stmt->args));
i = 0;
foreach(l, stmt->args)
{
Value *arg = (Value *) lfirst(l);
i++;
if (i < 4) /* skip constraint and table names */
continue;
if (i == 4) /* handle match type */
{
if (strcmp(strVal(arg), "FULL") == 0)
fk_matchtype = FKCONSTR_MATCH_FULL;
else
fk_matchtype = FKCONSTR_MATCH_UNSPECIFIED;
continue;
}
if (i % 2)
fk_attrs = lappend(fk_attrs, arg);
else
pk_attrs = lappend(pk_attrs, arg);
}
/* Prepare description of constraint for use in messages */
initStringInfo(&buf);
appendStringInfo(&buf, "FOREIGN KEY %s(",
quote_identifier(fk_table_name));
i = 0;
foreach(l, fk_attrs)
{
Value *arg = (Value *) lfirst(l);
if (i++ > 0)
appendStringInfoChar(&buf, ',');
appendStringInfoString(&buf, quote_identifier(strVal(arg)));
}
appendStringInfo(&buf, ") REFERENCES %s(",
quote_identifier(pk_table_name));
i = 0;
foreach(l, pk_attrs)
{
Value *arg = (Value *) lfirst(l);
if (i++ > 0)
appendStringInfoChar(&buf, ',');
appendStringInfoString(&buf, quote_identifier(strVal(arg)));
}
appendStringInfoChar(&buf, ')');
/* Identify class of trigger --- update, delete, or referencing-table */
switch (funcoid)
@ -508,8 +567,8 @@ ConvertTriggerToFK(CreateTrigStmt *stmt, Oid funcoid)
default:
/* Ignore triggers on referencing table */
ereport(NOTICE,
(errmsg("ignoring incomplete foreign-key trigger group for constraint \"%s\" on table \"%s\"",
stmt->trigname, stmt->relation->relname)));
(errmsg("ignoring incomplete trigger group for constraint \"%s\" %s",
constr_name, buf.data)));
return;
}
@ -527,8 +586,8 @@ ConvertTriggerToFK(CreateTrigStmt *stmt, Oid funcoid)
MemoryContext oldContext;
ereport(NOTICE,
(errmsg("ignoring incomplete foreign-key trigger group for constraint \"%s\" on table \"%s\"",
stmt->trigname, stmt->constrrel->relname)));
(errmsg("ignoring incomplete trigger group for constraint \"%s\" %s",
constr_name, buf.data)));
oldContext = MemoryContextSwitchTo(TopMemoryContext);
info = (OldTriggerInfo *) palloc(sizeof(OldTriggerInfo));
info->args = copyObject(stmt->args);
@ -539,49 +598,36 @@ ConvertTriggerToFK(CreateTrigStmt *stmt, Oid funcoid)
}
else
{
/* OK, we have a pair, so make the FK constraint */
/* OK, we have a pair, so make the FK constraint ALTER TABLE cmd */
AlterTableStmt *atstmt = makeNode(AlterTableStmt);
AlterTableCmd *atcmd = makeNode(AlterTableCmd);
FkConstraint *fkcon = makeNode(FkConstraint);
int i;
Oid updfunc,
delfunc;
ereport(NOTICE,
(errmsg("converting foreign-key trigger group into constraint \"%s\" on table \"%s\"",
stmt->trigname, stmt->constrrel->relname)));
atstmt->relation = stmt->constrrel;
(errmsg("converting trigger group into constraint \"%s\" %s",
constr_name, buf.data)));
if (stmt->constrrel)
atstmt->relation = stmt->constrrel;
else
{
/* Work around ancient pg_dump bug that omitted constrrel */
atstmt->relation = makeRangeVar(NULL, fk_table_name);
}
atstmt->cmds = list_make1(atcmd);
atstmt->relkind = OBJECT_TABLE;
atcmd->subtype = AT_AddConstraint;
atcmd->def = (Node *) fkcon;
if (strcmp(stmt->trigname, "<unnamed>") == 0)
if (strcmp(constr_name, "<unnamed>") == 0)
fkcon->constr_name = NULL;
else
fkcon->constr_name = stmt->trigname;
fkcon->constr_name = constr_name;
fkcon->pktable = stmt->relation;
i = 0;
foreach(l, stmt->args)
{
Value *arg = (Value *) lfirst(l);
i++;
if (i < 4) /* ignore constraint and table names */
continue;
if (i == 4) /* handle match type */
{
if (strcmp(strVal(arg), "FULL") == 0)
fkcon->fk_matchtype = FKCONSTR_MATCH_FULL;
else
fkcon->fk_matchtype = FKCONSTR_MATCH_UNSPECIFIED;
continue;
}
if (i % 2)
fkcon->fk_attrs = lappend(fkcon->fk_attrs, arg);
else
fkcon->pk_attrs = lappend(fkcon->pk_attrs, arg);
}
fkcon->fk_attrs = fk_attrs;
fkcon->pk_attrs = pk_attrs;
fkcon->fk_matchtype = fk_matchtype;
if (isupd)
{
@ -638,6 +684,7 @@ ConvertTriggerToFK(CreateTrigStmt *stmt, Oid funcoid)
fkcon->deferrable = stmt->deferrable;
fkcon->initdeferred = stmt->initdeferred;
/* ... and execute it */
ProcessUtility((Node *) atstmt,
NULL, NULL, false, None_Receiver, NULL);

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