Sophie: postgresql9.4-docs-9.4.15-1.mga6 noarch

postgresql9.4-docs-9.4.15-1.mga6.noarch.rpm

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>Utility 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 9.4.15 Documentation"
HREF="index.html"><LINK
REL="UP"
TITLE="PL/Python - Python Procedural Language"
HREF="plpython.html"><LINK
REL="PREVIOUS"
TITLE="Explicit Subtransactions"
HREF="plpython-subtransaction.html"><LINK
REL="NEXT"
TITLE="Environment Variables"
HREF="plpython-envar.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="2017-11-10T00:43:05"></HEAD
><BODY
CLASS="SECT1"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="4"
ALIGN="center"
VALIGN="bottom"
><A
HREF="index.html"
>PostgreSQL 9.4.15 Documentation</A
></TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="top"
><A
TITLE="Explicit Subtransactions"
HREF="plpython-subtransaction.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 43. PL/Python - Python Procedural Language</TD
><TD
WIDTH="20%"
ALIGN="right"
VALIGN="top"
><A
TITLE="Environment Variables"
HREF="plpython-envar.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="PLPYTHON-UTIL"
>43.9. Utility Functions</A
></H1
><P
>   The <TT
CLASS="LITERAL"
>plpy</TT
> module also provides the functions
   <TT
CLASS="LITERAL"
>plpy.debug(<TT
CLASS="REPLACEABLE"
><I
>msg</I
></TT
>)</TT
>,
   <TT
CLASS="LITERAL"
>plpy.log(<TT
CLASS="REPLACEABLE"
><I
>msg</I
></TT
>)</TT
>,
   <TT
CLASS="LITERAL"
>plpy.info(<TT
CLASS="REPLACEABLE"
><I
>msg</I
></TT
>)</TT
>,
   <TT
CLASS="LITERAL"
>plpy.notice(<TT
CLASS="REPLACEABLE"
><I
>msg</I
></TT
>)</TT
>,
   <TT
CLASS="LITERAL"
>plpy.warning(<TT
CLASS="REPLACEABLE"
><I
>msg</I
></TT
>)</TT
>,
   <TT
CLASS="LITERAL"
>plpy.error(<TT
CLASS="REPLACEABLE"
><I
>msg</I
></TT
>)</TT
>, and
   <TT
CLASS="LITERAL"
>plpy.fatal(<TT
CLASS="REPLACEABLE"
><I
>msg</I
></TT
>)</TT
>.
   <CODE
CLASS="FUNCTION"
>plpy.error</CODE
> and
   <CODE
CLASS="FUNCTION"
>plpy.fatal</CODE
> actually raise a Python exception
   which, if uncaught, propagates out to the calling query, causing
   the current transaction or subtransaction to be aborted.
   <TT
CLASS="LITERAL"
>raise plpy.Error(<TT
CLASS="REPLACEABLE"
><I
>msg</I
></TT
>)</TT
> and
   <TT
CLASS="LITERAL"
>raise plpy.Fatal(<TT
CLASS="REPLACEABLE"
><I
>msg</I
></TT
>)</TT
> are
   equivalent to calling
   <CODE
CLASS="FUNCTION"
>plpy.error</CODE
> and
   <CODE
CLASS="FUNCTION"
>plpy.fatal</CODE
>, respectively.
   The other functions only generate messages of different
   priority levels.
   Whether messages of a particular priority are reported to the client,
   written to the server log, or both is controlled by the
   <A
HREF="runtime-config-logging.html#GUC-LOG-MIN-MESSAGES"
>log_min_messages</A
> and
   <A
HREF="runtime-config-logging.html#GUC-CLIENT-MIN-MESSAGES"
>client_min_messages</A
> configuration
   variables. See <A
HREF="runtime-config.html"
>Chapter 18</A
> for more information.
  </P
><P
>   Another set of utility functions are
   <TT
CLASS="LITERAL"
>plpy.quote_literal(<TT
CLASS="REPLACEABLE"
><I
>string</I
></TT
>)</TT
>,
   <TT
CLASS="LITERAL"
>plpy.quote_nullable(<TT
CLASS="REPLACEABLE"
><I
>string</I
></TT
>)</TT
>, and
   <TT
CLASS="LITERAL"
>plpy.quote_ident(<TT
CLASS="REPLACEABLE"
><I
>string</I
></TT
>)</TT
>.  They
   are equivalent to the built-in quoting functions described in <A
HREF="functions-string.html"
>Section 9.4</A
>.  They are useful when constructing
   ad-hoc queries.  A PL/Python equivalent of dynamic SQL from <A
HREF="plpgsql-statements.html#PLPGSQL-QUOTE-LITERAL-EXAMPLE"
>Example 40-1</A
> would be:
</P><PRE
CLASS="PROGRAMLISTING"
>plpy.execute("UPDATE tbl SET %s = %s WHERE key = %s" % (
    plpy.quote_ident(colname),
    plpy.quote_nullable(newvalue),
    plpy.quote_literal(keyvalue)))</PRE
><P>
  </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-subtransaction.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-envar.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>Explicit Subtransactions</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="plpython.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>Environment Variables</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>