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DROP IF EXISTS for columns and constraints. Andres Freund.

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This commit is contained in:
Andrew Dunstan
2009-07-20 02:42:28 +00:00
parent 31d1f23302
commit e73131a16a
8 changed files with 111 additions and 32 deletions
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24
src/backend/parser/gram.y
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@@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.670 2009/07/16 06:33:43 petere Exp $
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.671 2009/07/20 02:42:28 adunstan Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -1610,6 +1610,16 @@ alter_table_cmd:
n->def = (Node *) makeString($6);
$$ = (Node *)n;
}
/* ALTER TABLE <name> DROP [COLUMN] IF EXISTS <colname> [RESTRICT|CASCADE] */
| DROP opt_column IF_P EXISTS ColId opt_drop_behavior
{
AlterTableCmd *n = makeNode(AlterTableCmd);
n->subtype = AT_DropColumn;
n->name = $5;
n->behavior = $6;
n->missing_ok = TRUE;
$$ = (Node *)n;
}
/* ALTER TABLE <name> DROP [COLUMN] <colname> [RESTRICT|CASCADE] */
| DROP opt_column ColId opt_drop_behavior
{
@@ -1617,6 +1627,7 @@ alter_table_cmd:
n->subtype = AT_DropColumn;
n->name = $3;
n->behavior = $4;
n->missing_ok = FALSE;
$$ = (Node *)n;
}
/*
@@ -1640,6 +1651,16 @@ alter_table_cmd:
n->def = $2;
$$ = (Node *)n;
}
/* ALTER TABLE <name> DROP CONSTRAINT IF EXISTS <name> [RESTRICT|CASCADE] */
| DROP CONSTRAINT IF_P EXISTS name opt_drop_behavior
{
AlterTableCmd *n = makeNode(AlterTableCmd);
n->subtype = AT_DropConstraint;
n->name = $5;
n->behavior = $6;
n->missing_ok = TRUE;
$$ = (Node *)n;
}
/* ALTER TABLE <name> DROP CONSTRAINT <name> [RESTRICT|CASCADE] */
| DROP CONSTRAINT name opt_drop_behavior
{
@@ -1647,6 +1668,7 @@ alter_table_cmd:
n->subtype = AT_DropConstraint;
n->name = $3;
n->behavior = $4;
n->missing_ok = FALSE;
$$ = (Node *)n;
}
/* ALTER TABLE <name> SET WITH OIDS */