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Improve ALTER DOMAIN / DROP CONSTRAINT with nonexistent constraint

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ALTER DOMAIN / DROP CONSTRAINT on a nonexistent constraint name did
not report any error.  Now it reports an error.  The IF EXISTS option
was added to get the usual behavior of ignoring nonexistent objects to
drop.
This commit is contained in:
Peter Eisentraut
2012-01-05 19:48:55 +02:00
parent 2abefd9a92
commit 104e7dac28
10 changed files with 45 additions and 5 deletions
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6
doc/src/sgml/ref/alter_domain.sgml
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@@ -30,7 +30,7 @@ ALTER DOMAIN <replaceable class="PARAMETER">name</replaceable>
ALTER DOMAIN <replaceable class="PARAMETER">name</replaceable>
ADD <replaceable class="PARAMETER">domain_constraint</replaceable> [ NOT VALID ]
ALTER DOMAIN <replaceable class="PARAMETER">name</replaceable>
DROP CONSTRAINT <replaceable class="PARAMETER">constraint_name</replaceable> [ RESTRICT | CASCADE ]
DROP CONSTRAINT [ IF EXISTS ] <replaceable class="PARAMETER">constraint_name</replaceable> [ RESTRICT | CASCADE ]
ALTER DOMAIN <replaceable class="PARAMETER">name</replaceable>
VALIDATE CONSTRAINT <replaceable class="PARAMETER">constraint_name</replaceable>
ALTER DOMAIN <replaceable class="PARAMETER">name</replaceable>
@@ -92,10 +92,12 @@ ALTER DOMAIN <replaceable class="PARAMETER">name</replaceable>
</varlistentry>
<varlistentry>
<term>DROP CONSTRAINT</term>
<term>DROP CONSTRAINT [ IF EXISTS ]</term>
<listitem>
<para>
This form drops constraints on a domain.
If <literal>IF EXISTS</literal> is specified and the constraint
does not exist, no error is thrown. In this case a notice is issued instead.
</para>
</listitem>
</varlistentry>