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postgresql8.3-docs-8.3.6-2mdv2008.1.x86_64.rpm

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><H1
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><A
NAME="CATALOG-PG-TRIGGER"
>44.35. <TT
CLASS="STRUCTNAME"
>pg_trigger</TT
></A
></H1
><A
NAME="AEN71358"
></A
><P
>   The catalog <TT
CLASS="STRUCTNAME"
>pg_trigger</TT
> stores triggers on tables.
   See <A
HREF="sql-createtrigger.html"
><I
>CREATE TRIGGER</I
></A
>
   for more information.
  </P
><DIV
CLASS="TABLE"
><A
NAME="AEN71363"
></A
><P
><B
>Table 44-35. <TT
CLASS="STRUCTNAME"
>pg_trigger</TT
> Columns</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><COL><THEAD
><TR
><TH
>Name</TH
><TH
>Type</TH
><TH
>References</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>tgrelid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-class.html"
><TT
CLASS="STRUCTNAME"
>pg_class</TT
></A
>.oid</TT
></TD
><TD
>The table this trigger is on</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>tgname</TT
></TD
><TD
><TT
CLASS="TYPE"
>name</TT
></TD
><TD
>&nbsp;</TD
><TD
>Trigger name (must be unique among triggers of same table)</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>tgfoid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-proc.html"
><TT
CLASS="STRUCTNAME"
>pg_proc</TT
></A
>.oid</TT
></TD
><TD
>The function to be called</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>tgtype</TT
></TD
><TD
><TT
CLASS="TYPE"
>int2</TT
></TD
><TD
>&nbsp;</TD
><TD
>Bit mask identifying trigger conditions</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>tgenabled</TT
></TD
><TD
><TT
CLASS="TYPE"
>char</TT
></TD
><TD
>&nbsp;</TD
><TD
>       Controls in which <A
HREF="runtime-config-client.html#GUC-SESSION-REPLICATION-ROLE"
>session_replication_role</A
> modes
       the trigger fires.
       <TT
CLASS="LITERAL"
>O</TT
> = trigger fires in <SPAN
CLASS="QUOTE"
>"origin"</SPAN
> and <SPAN
CLASS="QUOTE"
>"local"</SPAN
> modes,
       <TT
CLASS="LITERAL"
>D</TT
> = trigger is disabled,
       <TT
CLASS="LITERAL"
>R</TT
> = trigger fires in <SPAN
CLASS="QUOTE"
>"replica"</SPAN
> mode,
       <TT
CLASS="LITERAL"
>A</TT
> = trigger fires always.
      </TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>tgisconstraint</TT
></TD
><TD
><TT
CLASS="TYPE"
>bool</TT
></TD
><TD
>&nbsp;</TD
><TD
>True if trigger is a <SPAN
CLASS="QUOTE"
>"constraint trigger"</SPAN
></TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>tgconstrname</TT
></TD
><TD
><TT
CLASS="TYPE"
>name</TT
></TD
><TD
>&nbsp;</TD
><TD
>Constraint name, if a constraint trigger</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>tgconstrrelid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-class.html"
><TT
CLASS="STRUCTNAME"
>pg_class</TT
></A
>.oid</TT
></TD
><TD
>The table referenced by a referential integrity constraint</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>tgconstraint</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-constraint.html"
><TT
CLASS="STRUCTNAME"
>pg_constraint</TT
></A
>.oid</TT
></TD
><TD
>The <TT
CLASS="STRUCTNAME"
>pg_constraint</TT
> entry owning the trigger, if any</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>tgdeferrable</TT
></TD
><TD
><TT
CLASS="TYPE"
>bool</TT
></TD
><TD
>&nbsp;</TD
><TD
>True if constraint trigger is deferrable</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>tginitdeferred</TT
></TD
><TD
><TT
CLASS="TYPE"
>bool</TT
></TD
><TD
>&nbsp;</TD
><TD
>True if constraint trigger is initially deferred</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>tgnargs</TT
></TD
><TD
><TT
CLASS="TYPE"
>int2</TT
></TD
><TD
>&nbsp;</TD
><TD
>Number of argument strings passed to trigger function</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>tgattr</TT
></TD
><TD
><TT
CLASS="TYPE"
>int2vector</TT
></TD
><TD
>&nbsp;</TD
><TD
>Currently unused</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>tgargs</TT
></TD
><TD
><TT
CLASS="TYPE"
>bytea</TT
></TD
><TD
>&nbsp;</TD
><TD
>Argument strings to pass to trigger, each NULL-terminated</TD
></TR
></TBODY
></TABLE
></DIV
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>    When <TT
CLASS="STRUCTFIELD"
>tgconstraint</TT
> is nonzero,
    <TT
CLASS="STRUCTFIELD"
>tgisconstraint</TT
> must be true, and
    <TT
CLASS="STRUCTFIELD"
>tgconstrname</TT
>, <TT
CLASS="STRUCTFIELD"
>tgconstrrelid</TT
>,
    <TT
CLASS="STRUCTFIELD"
>tgdeferrable</TT
>, <TT
CLASS="STRUCTFIELD"
>tginitdeferred</TT
> are redundant
    with the referenced <TT
CLASS="STRUCTNAME"
>pg_constraint</TT
> entry.  The reason we
    keep these fields is that we support <SPAN
CLASS="QUOTE"
>"stand-alone"</SPAN
> constraint
    triggers with no corresponding <TT
CLASS="STRUCTNAME"
>pg_constraint</TT
> entry.
   </P
></BLOCKQUOTE
></DIV
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>    <TT
CLASS="LITERAL"
>pg_class.reltriggers</TT
> needs to agree with the
    number of triggers found in this table for each relation.
   </P
></BLOCKQUOTE
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