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$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_constraint.sgml,v 1.2 2000/07/22 04:30:27 momjian Exp $
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Postgres documentation
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<refentry id="SQL-CREATECONSTRAINT">
<refmeta>
<refentrytitle id="sql-createconstraint-title">
CREATE CONSTRAINT TRIGGER
</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>
CREATE CONSTRAINT TRIGGER
</refname>
<refpurpose>
Create a trigger to support a constraint
</refpurpose>
</refnamediv>
<refsynopsisdiv>
<refsynopsisdivinfo>
<date>2000-04-13</date>
</refsynopsisdivinfo>
<synopsis>
CREATE CONSTRAINT TRIGGER <replaceable class="parameter">name</replaceable>
AFTER <replaceable class="parameter">events</replaceable> ON
<replaceable class="parameter">relation</replaceable> <replaceable class="parameter">constraint</replaceable> <replaceable class="parameter">attributes</replaceable>
FOR EACH ROW EXECUTE PROCEDURE <replaceable class="parameter">func</replaceable> '(' <replaceable class="parameter">args</replaceable> ')'
</synopsis>
<refsect2 id="R2-SQL-CREATECONSTRAINT-1">
<title>
Inputs
</title>
<para>
<variablelist>
<varlistentry>
<term><replaceable class="PARAMETER">name</replaceable></term>
<listitem>
<para>
The name of the constraint trigger.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">events</replaceable></term>
<listitem>
<para>
The event categories for which this trigger should be fired.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">relation</replaceable></term>
<listitem>
<para>
Table name of the triggering relation.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">constraint</replaceable></term>
<listitem>
<para>
Actual onstraint specification.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">attributes</replaceable></term>
<listitem>
<para>
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</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">func</replaceable>(<replaceable class="PARAMETER">args</replaceable>)</term>
<listitem>
<para>
Function to call as part of the trigger processing.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
<refsect2 id="R2-SQL-CREATECONSTRAINT-2">
<title>
Outputs
</title>
<para>
<variablelist>
<varlistentry>
<term><computeroutput>
CREATE CONSTRAINT
</computeroutput></term>
<listitem>
<para>
Message returned if successful.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
</refsynopsisdiv>
<refsect1 id="R1-SQL-CREATECONSTRAINT-1">
<title>
Description
</title>
<para>
<command>CREATE CONSTRAINT TRIGGER</command> is used from inside of
<command>CREATE/ALTER TABLE</command> and by
<application>pg_dump</application> to create the special triggers for
referential integrity.
</para>
<para>
It is not intended for general use.
</para>
</refsect1>
</refentry>
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