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
>WHENEVER</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="Embedded SQL Commands"
HREF="ecpg-sql-commands.html"><LINK
REL="PREVIOUS"
TITLE="VAR"
HREF="ecpg-sql-var.html"><LINK
REL="NEXT"
TITLE="Informix Compatibility Mode"
HREF="ecpg-informix-compat.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="REFENTRY"
><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="VAR"
HREF="ecpg-sql-var.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="top"
><A
HREF="ecpg-sql-commands.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="60%"
ALIGN="center"
VALIGN="bottom"
></TD
><TD
WIDTH="20%"
ALIGN="right"
VALIGN="top"
><A
TITLE="Informix Compatibility Mode"
HREF="ecpg-informix-compat.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="ECPG-SQL-WHENEVER"
></A
>WHENEVER</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN48847"
></A
><H2
>Name</H2
>WHENEVER&nbsp;--&nbsp;specify the action to be taken when an SQL statement causes a specific class condition to be raised</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN48850"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>WHENEVER { NOT FOUND | SQLERROR | SQLWARNING } <TT
CLASS="REPLACEABLE"
><I
>action</I
></TT
></PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN48853"
></A
><H2
>Description</H2
><P
>     Define a behavior which is called on the special cases (Rows not
     found, SQL warnings or errors) in the result of SQL execution.
    </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN48856"
></A
><H2
>Parameters</H2
><P
>     See <A
HREF="ecpg-errors.html#ECPG-WHENEVER"
>Section 33.8.1</A
> for a description of the
     parameters.
    </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN48860"
></A
><H2
>Examples</H2
><PRE
CLASS="PROGRAMLISTING"
>EXEC SQL WHENEVER NOT FOUND CONTINUE;
EXEC SQL WHENEVER NOT FOUND DO BREAK;
EXEC SQL WHENEVER SQLWARNING SQLPRINT;
EXEC SQL WHENEVER SQLWARNING DO warn();
EXEC SQL WHENEVER SQLERROR sqlprint;
EXEC SQL WHENEVER SQLERROR CALL print2();
EXEC SQL WHENEVER SQLERROR DO handle_error("select");
EXEC SQL WHENEVER SQLERROR DO sqlnotice(NULL, NONO);
EXEC SQL WHENEVER SQLERROR DO sqlprint();
EXEC SQL WHENEVER SQLERROR GOTO error_label;
EXEC SQL WHENEVER SQLERROR STOP;</PRE
><P
>     A typical application is the use of <TT
CLASS="LITERAL"
>WHENEVER NOT FOUND
     BREAK</TT
> to handle looping through result sets:
</P><PRE
CLASS="PROGRAMLISTING"
>int
main(void)
{
    EXEC SQL CONNECT TO testdb AS con1;
    EXEC SQL ALLOCATE DESCRIPTOR d;
    EXEC SQL DECLARE cur CURSOR FOR SELECT current_database(), 'hoge', 256;
    EXEC SQL OPEN cur;

    /* when end of result set reached, break out of while loop */
    EXEC SQL WHENEVER NOT FOUND DO BREAK;

    while (1)
    {
        EXEC SQL FETCH NEXT FROM cur INTO SQL DESCRIPTOR d;
        ...
    }

    EXEC SQL CLOSE cur;
    EXEC SQL COMMIT;

    EXEC SQL DEALLOCATE DESCRIPTOR d;
    EXEC SQL DISCONNECT ALL;

    return 0;
}</PRE
><P>
    </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN48866"
></A
><H2
>Compatibility</H2
><P
>     <TT
CLASS="COMMAND"
>WHENEVER</TT
> is specified in the SQL standard, but
     most of the actions are PostgreSQL extensions.
    </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="ecpg-sql-var.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="ecpg-informix-compat.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>VAR</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="ecpg-sql-commands.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><SPAN
CLASS="PRODUCTNAME"
>Informix</SPAN
> Compatibility Mode</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>