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ALTER TABLE ... ALTER CONSTRAINT for FKs

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Allow constraint attributes to be altered,
so the default setting of NOT DEFERRABLE
can be altered to DEFERRABLE and back.

Review by Abhijit Menon-Sen
This commit is contained in:
Simon Riggs
2013-06-29 00:27:30 +01:00
parent 2f74e4ec50
commit f177cbfe67
6 changed files with 205 additions and 0 deletions
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15
src/backend/parser/gram.y
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@ -1943,6 +1943,21 @@ alter_table_cmd:
n->def = $2;
$$ = (Node *)n;
}
/* ALTER TABLE <name> ALTER CONSTRAINT ... */
| ALTER CONSTRAINT name ConstraintAttributeSpec
{
AlterTableCmd *n = makeNode(AlterTableCmd);
Constraint *c = makeNode(Constraint);
n->subtype = AT_AlterConstraint;
n->def = (Node *) c;
c->contype = CONSTR_FOREIGN; /* others not supported, yet */
c->conname = $3;
processCASbits($4, @4, "ALTER CONSTRAINT statement",
&c->deferrable,
&c->initdeferred,
NULL, NULL, yyscanner);
$$ = (Node *)n;
}
/* ALTER TABLE <name> VALIDATE CONSTRAINT ... */
| VALIDATE CONSTRAINT name
{