| Server IP : 103.119.228.120 / Your IP : 52.15.37.74 Web Server : Apache System : Linux v8.techscape8.com 3.10.0-1160.119.1.el7.tuxcare.els2.x86_64 #1 SMP Mon Jul 15 12:09:18 UTC 2024 x86_64 User : nobody ( 99) PHP Version : 5.6.40 Disable Function : shell_exec,symlink,system,exec,proc_get_status,proc_nice,proc_terminate,define_syslog_variables,syslog,openlog,closelog,escapeshellcmd,passthru,ocinum cols,ini_alter,leak,listen,chgrp,apache_note,apache_setenv,debugger_on,debugger_off,ftp_exec,dl,dll,myshellexec,proc_open,socket_bind,proc_close,escapeshellarg,parse_ini_filepopen,fpassthru,exec,passthru,escapeshellarg,escapeshellcmd,proc_close,proc_open,ini_alter,popen,show_source,proc_nice,proc_terminate,proc_get_status,proc_close,pfsockopen,leak,apache_child_terminate,posix_kill,posix_mkfifo,posix_setpgid,posix_setsid,posix_setuid,dl,symlink,shell_exec,system,dl,passthru,escapeshellarg,escapeshellcmd,myshellexec,c99_buff_prepare,c99_sess_put,fpassthru,getdisfunc,fx29exec,fx29exec2,is_windows,disp_freespace,fx29sh_getupdate,fx29_buff_prepare,fx29_sess_put,fx29shexit,fx29fsearch,fx29ftpbrutecheck,fx29sh_tools,fx29sh_about,milw0rm,imagez,sh_name,myshellexec,checkproxyhost,dosyayicek,c99_buff_prepare,c99_sess_put,c99getsource,c99sh_getupdate,c99fsearch,c99shexit,view_perms,posix_getpwuid,posix_getgrgid,posix_kill,parse_perms,parsesort,view_perms_color,set_encoder_input,ls_setcheckboxall,ls_reverse_all,rsg_read,rsg_glob,selfURL,dispsecinfo,unix2DosTime,addFile,system,get_users,view_size,DirFiles,DirFilesWide,DirPrintHTMLHeaders,GetFilesTotal,GetTitles,GetTimeTotal,GetMatchesCount,GetFileMatchesCount,GetResultFiles,fs_copy_dir,fs_copy_obj,fs_move_dir,fs_move_obj,fs_rmdir,SearchText,getmicrotime MySQL : ON | cURL : ON | WGET : ON | Perl : ON | Python : ON | Sudo : ON | Pkexec : ON Directory : /usr/local/ssl/share/doc/postgresql-9.2.24/html/ |
Upload File : |
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>Trigger Functions</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
REV="MADE"
HREF="mailto:pgsql-docs@postgresql.org"><LINK
REL="HOME"
TITLE="PostgreSQL 9.2.24 Documentation"
HREF="index.html"><LINK
REL="UP"
TITLE="PL/Python - Python Procedural Language"
HREF="plpython.html"><LINK
REL="PREVIOUS"
TITLE="Anonymous Code Blocks"
HREF="plpython-do.html"><LINK
REL="NEXT"
TITLE="Database Access"
HREF="plpython-database.html"><LINK
REL="STYLESHEET"
TYPE="text/css"
HREF="stylesheet.css"><META
HTTP-EQUIV="Content-Type"
CONTENT="text/html; charset=ISO-8859-1"><META
NAME="creation"
CONTENT="2017-11-06T22:43:11"></HEAD
><BODY
CLASS="SECT1"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="5"
ALIGN="center"
VALIGN="bottom"
><A
HREF="index.html"
>PostgreSQL 9.2.24 Documentation</A
></TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="top"
><A
TITLE="Anonymous Code Blocks"
HREF="plpython-do.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="top"
><A
HREF="plpython.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="60%"
ALIGN="center"
VALIGN="bottom"
>Chapter 42. PL/Python - Python Procedural Language</TD
><TD
WIDTH="20%"
ALIGN="right"
VALIGN="top"
><A
TITLE="Database Access"
HREF="plpython-database.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="PLPYTHON-TRIGGER"
>42.6. Trigger Functions</A
></H1
><P
> When a function is used as a trigger, the dictionary
<TT
CLASS="LITERAL"
>TD</TT
> contains trigger-related values:
<P
></P
></P><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>TD["event"]</TT
></DT
><DD
><P
> contains the event as a string:
<TT
CLASS="LITERAL"
>INSERT</TT
>, <TT
CLASS="LITERAL"
>UPDATE</TT
>,
<TT
CLASS="LITERAL"
>DELETE</TT
>, or <TT
CLASS="LITERAL"
>TRUNCATE</TT
>.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>TD["when"]</TT
></DT
><DD
><P
> contains one of <TT
CLASS="LITERAL"
>BEFORE</TT
>, <TT
CLASS="LITERAL"
>AFTER</TT
>, or
<TT
CLASS="LITERAL"
>INSTEAD OF</TT
>.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>TD["level"]</TT
></DT
><DD
><P
> contains <TT
CLASS="LITERAL"
>ROW</TT
> or <TT
CLASS="LITERAL"
>STATEMENT</TT
>.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>TD["new"]</TT
><BR><TT
CLASS="LITERAL"
>TD["old"]</TT
></DT
><DD
><P
> For a row-level trigger, one or both of these fields contain
the respective trigger rows, depending on the trigger event.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>TD["name"]</TT
></DT
><DD
><P
> contains the trigger name.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>TD["table_name"]</TT
></DT
><DD
><P
> contains the name of the table on which the trigger occurred.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>TD["table_schema"]</TT
></DT
><DD
><P
> contains the schema of the table on which the trigger occurred.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>TD["relid"]</TT
></DT
><DD
><P
> contains the OID of the table on which the trigger occurred.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>TD["args"]</TT
></DT
><DD
><P
> If the <TT
CLASS="COMMAND"
>CREATE TRIGGER</TT
> command
included arguments, they are available in <TT
CLASS="LITERAL"
>TD["args"][0]</TT
> to
<TT
CLASS="LITERAL"
>TD["args"][<TT
CLASS="REPLACEABLE"
><I
>n</I
></TT
>-1]</TT
>.
</P
></DD
></DL
></DIV
><P>
</P
><P
> If <TT
CLASS="LITERAL"
>TD["when"]</TT
> is <TT
CLASS="LITERAL"
>BEFORE</TT
> or
<TT
CLASS="LITERAL"
>INSTEAD OF</TT
> and
<TT
CLASS="LITERAL"
>TD["level"]</TT
> is <TT
CLASS="LITERAL"
>ROW</TT
>, you can
return <TT
CLASS="LITERAL"
>None</TT
> or <TT
CLASS="LITERAL"
>"OK"</TT
> from the
Python function to indicate the row is unmodified,
<TT
CLASS="LITERAL"
>"SKIP"</TT
> to abort the event, or if <TT
CLASS="LITERAL"
>TD["event"]</TT
>
is <TT
CLASS="COMMAND"
>INSERT</TT
> or <TT
CLASS="COMMAND"
>UPDATE</TT
> you can return
<TT
CLASS="LITERAL"
>"MODIFY"</TT
> to indicate you've modified the new row.
Otherwise the return value is ignored.
</P
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="plpython-do.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="index.html"
ACCESSKEY="H"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="plpython-database.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>Anonymous Code Blocks</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="plpython.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>Database Access</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>