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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>WHENEVER</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="[email protected]" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="ecpg-sql-var.html" title="VAR" /><link rel="next" href="ecpg-informix-compat.html" title="35.15. Informix Compatibility Mode" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">WHENEVER</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="ecpg-sql-var.html" title="VAR">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="ecpg-sql-commands.html" title="35.14. Embedded SQL Commands">Up</a></td><th width="60%" align="center">35.14. Embedded SQL Commands</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 10.23 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="ecpg-informix-compat.html" title="35.15. Informix Compatibility Mode">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="ECPG-SQL-WHENEVER"><div class="titlepage"></div><div class="refnamediv"><h2>WHENEVER</h2><p>WHENEVER — specify the action to be taken when an SQL statement causes a specific class condition to be raised</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">WHENEVER { NOT FOUND | SQLERROR | SQLWARNING } <em class="replaceable"><code>action</code></em></pre></div><div class="refsect1" id="id-1.7.5.20.18.3"><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" id="id-1.7.5.20.18.4"><h2>Parameters</h2><p> See <a class="xref" href="ecpg-errors.html#ECPG-WHENEVER" title="35.8.1. Setting Callbacks">Section 35.8.1</a> for a description of the
parameters.
</p></div><div class="refsect1" id="id-1.7.5.20.18.5"><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 <code class="literal">WHENEVER NOT FOUND
BREAK</code> to handle looping through result sets:
</p><pre class="programlisting">int
main(void)
{
EXEC SQL CONNECT TO testdb AS con1;
EXEC SQL SELECT pg_catalog.set_config('search_path', '', false); EXEC SQL COMMIT;
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" id="id-1.7.5.20.18.6"><h2>Compatibility</h2><p> <code class="command">WHENEVER</code> is specified in the SQL standard, but
most of the actions are PostgreSQL extensions.
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