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This patch makes pg_get_constraintdef support UNIQUE, PRIMARY KEY and

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CHECK constraints.

There are apparently no other types of constraint in pg_constraint, so
now all bases are covered.  Also, this patch assumes that consrc for a
CHECK constraint is always bracketed so that it's not necessary to add
extra brackets.

Christopher Kings-Lynne
This commit is contained in:
Bruce Momjian 2003-02-13 05:10:39 +00:00
parent d21de3b121
commit 8add2e1bca
1 changed files with 47 additions and 7 deletions
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54
src/backend/utils/adt/ruleutils.c
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@ -3,7 +3,7 @@
* back to source text
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/ruleutils.c,v 1.134 2003/02/03 21:15:44 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/ruleutils.c,v 1.135 2003/02/13 05:10:39 momjian Exp $
*
* This software is copyrighted by Jan Wieck - Hamburg.
*
@ -546,9 +546,6 @@ pg_get_indexdef(PG_FUNCTION_ARGS)
*
* Returns the definition for the constraint, ie, everything that needs to
* appear after "ALTER TABLE ... ADD CONSTRAINT <constraintname>".
*
* XXX The present implementation only works for foreign-key constraints, but
* it could and should handle anything pg_constraint stores.
*/
Datum
pg_get_constraintdef(PG_FUNCTION_ARGS)
@ -698,10 +695,53 @@ pg_get_constraintdef(PG_FUNCTION_ARGS)
break;
}
case CONSTRAINT_PRIMARY:
case CONSTRAINT_UNIQUE:
{
Datum val;
bool isnull;
/*
* XXX Add more code here for other contypes
*/
/* Start off the constraint definition */
if (conForm->contype == CONSTRAINT_PRIMARY)
appendStringInfo(&buf, "PRIMARY KEY (");
else
appendStringInfo(&buf, "UNIQUE (");
/* Fetch and build target column list */
val = heap_getattr(tup, Anum_pg_constraint_conkey,
RelationGetDescr(conDesc), &isnull);
if (isnull)
elog(ERROR, "pg_get_constraintdef: Null conkey for constraint %u",
constraintId);
decompile_column_index_array(val, conForm->conrelid, &buf);
appendStringInfo(&buf, ")");
break;
}
case CONSTRAINT_CHECK:
{
Datum val;
bool isnull;
/* Start off the constraint definition */
/* The consrc for CHECK constraints always seems to be
bracketed, so we don't add extra brackets here. */
appendStringInfo(&buf, "CHECK ");
/* Fetch constraint source */
val = heap_getattr(tup, Anum_pg_constraint_consrc,
RelationGetDescr(conDesc), &isnull);
if (isnull)
elog(ERROR, "pg_get_constraintdef: Null consrc for constraint %u",
constraintId);
/* Append the constraint source */
appendStringInfo(&buf, DatumGetCString(DirectFunctionCall1(textout, val)));
break;
}
default:
elog(ERROR, "pg_get_constraintdef: unsupported constraint type '%c'",
conForm->contype);