Sophie: postgresql8.4-docs-8.4.12-0.1mdv2010.2 i586

postgresql8.4-docs-8.4.12-0.1mdv2010.2.i586.rpm

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><H1
><A
NAME="SQL-CREATECONSTRAINT"
></A
>CREATE CONSTRAINT TRIGGER</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN56367"
></A
><H2
>Name</H2
>CREATE CONSTRAINT TRIGGER&nbsp;--&nbsp;define a new constraint trigger</DIV
><A
NAME="AEN56370"
></A
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN56372"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>CREATE CONSTRAINT TRIGGER <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
>
    AFTER <TT
CLASS="REPLACEABLE"
><I
>event</I
></TT
> [ OR ... ]
    ON <TT
CLASS="REPLACEABLE"
><I
>table_name</I
></TT
>
    [ FROM <TT
CLASS="REPLACEABLE"
><I
>referenced_table_name</I
></TT
> ]
    { NOT DEFERRABLE | [ DEFERRABLE ] { INITIALLY IMMEDIATE | INITIALLY DEFERRED } }
    FOR EACH ROW
    EXECUTE PROCEDURE <TT
CLASS="REPLACEABLE"
><I
>funcname</I
></TT
> ( <TT
CLASS="REPLACEABLE"
><I
>arguments</I
></TT
> )</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN56380"
></A
><H2
>Description</H2
><P
>   <TT
CLASS="COMMAND"
>CREATE CONSTRAINT TRIGGER</TT
> creates a
   <I
CLASS="FIRSTTERM"
>constraint trigger</I
>.  This is the same as a regular trigger
   except that the timing of the trigger firing can be adjusted using
   <A
HREF="sql-set-constraints.html"
><I
>SET CONSTRAINTS</I
></A
>.
   Constraint triggers must be <TT
CLASS="LITERAL"
>AFTER ROW</TT
> triggers.  They can
   be fired either at the end of the statement causing the triggering event,
   or at the end of the containing transaction; in the latter case they are
   said to be <I
CLASS="FIRSTTERM"
>deferred</I
>.  A pending deferred-trigger firing can
   also be forced to happen immediately by using <TT
CLASS="COMMAND"
>SET CONSTRAINTS</TT
>.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN56389"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
></DT
><DD
><P
>      The name of the constraint trigger.  This is also the name to use
      when modifying the trigger's behavior using <TT
CLASS="COMMAND"
>SET CONSTRAINTS</TT
>.
      The name cannot be schema-qualified &mdash; the trigger inherits the
      schema of its table.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>event</I
></TT
></DT
><DD
><P
>      One of <TT
CLASS="LITERAL"
>INSERT</TT
>, <TT
CLASS="LITERAL"
>UPDATE</TT
>, or
      <TT
CLASS="LITERAL"
>DELETE</TT
>; this specifies the event that will fire the
      trigger. Multiple events can be specified using <TT
CLASS="LITERAL"
>OR</TT
>.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>table_name</I
></TT
></DT
><DD
><P
>      The (possibly schema-qualified) name of the table in which
      the triggering events occur.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>referenced_table_name</I
></TT
></DT
><DD
><P
>      The (possibly schema-qualified) name of another table referenced by the
      constraint.  This option is used for foreign-key constraints and is not
      recommended for general use.
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>DEFERRABLE</TT
><BR><TT
CLASS="LITERAL"
>NOT DEFERRABLE</TT
><BR><TT
CLASS="LITERAL"
>INITIALLY IMMEDIATE</TT
><BR><TT
CLASS="LITERAL"
>INITIALLY DEFERRED</TT
></DT
><DD
><P
>      The default timing of the trigger.
      See the <A
HREF="sql-createtable.html"
><I
>CREATE TABLE</I
></A
>
      documentation for details of these constraint options.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>funcname</I
></TT
></DT
><DD
><P
>      The function to call when the trigger is fired. See <A
HREF="sql-createtrigger.html"
><I
>CREATE TRIGGER</I
></A
> for
      details.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>arguments</I
></TT
></DT
><DD
><P
>      Optional argument strings to pass to the trigger function. See <A
HREF="sql-createtrigger.html"
><I
>CREATE TRIGGER</I
></A
> for
      details.
     </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN56441"
></A
><H2
>Compatibility</H2
><P
>   <TT
CLASS="COMMAND"
>CREATE CONSTRAINT TRIGGER</TT
> is a
   <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> extension of the <ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
>
   standard.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN56447"
></A
><H2
>See Also</H2
><A
HREF="sql-createtrigger.html"
><I
>CREATE TRIGGER</I
></A
>, <A
HREF="sql-droptrigger.html"
><I
>DROP TRIGGER</I
></A
>, <A
HREF="sql-set-constraints.html"
><I
>SET CONSTRAINTS</I
></A
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