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<title>OTL 4.0, Example 471 (DB2, stored procedure with output
parameters and a return code)</title>
<meta name="Author" content="Sergei Kuchin">
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<h1 align="center">OTL 4.0, Example 471 (DB2, stored procedure with
output parameters and a return code)</h1>
<p>This example demonstrates a DB2 SQL/PL stored procedure with output
parameters and a return code.. This example should work as is with DB2
8.2 or higher.<br>
</p>
<h2>Source Code</h2>
<pre>#include <iostream><br>using namespace std;<br><br>#include <stdio.h><br>#define OTL_DB2_CLI // Compile OTL 4.0/DB2-CLI<br>#include <otlv4.h><br><br><a
href="otl3_connect_class.htm">otl_connect</a> db; // connect object<br><br>void stored_proc(void)<br>// invoking stored procedure<br>{ <br> <a
href="otl3_stream_class.htm">otl_stream</a> o(1, // buffer size should be equal to 1 in case of stored procedure call<br> "{ :rc<int,out> = call my_proc("<br> " :A<int,inout>, "<br> " :B<char[31],out>, "<br> " :C<char[31],in> "<br> ")}",<br> // stored procedure call<br> db // connect object<br> );<br><br> o.<a
href="otl3_stream_class.htm#set_commit">set_commit</a>(0); // set stream auto-commit off since<br> // the stream does not generate transaction<br><br> o<<1<<"Test String1"; // assigning :A = 1, :C = "Test String1"<br><br> int rc;<br> int a;<br> char b[31];<br><br> o>>rc>>a>>b;<br> cout<<"RC="<<rc<<", A="<<a<<", B="<<b<<endl;<br><br>}<br><br>int main()<br>{<br> otl_connect::otl_initialize(); // initialize DB2 CLI environment<br> try{<br> db.rlogon("scott/tiger@db2sql"); // connect to DB2<br> otl_cursor::direct_exec<br> (db,"DROP PROCEDURE my_proc",0); // drop procedure and ignore any errors<br> otl_cursor::direct_exec<br> (db,<br> "create procedure my_proc "<br> "(inout a integer, "<br> " out b varchar(60), "<br> " inout c varchar(60)) "<br> "language SQL "<br> "begin "<br> " set a = a + 1; "<br> " set b = c; "<br> " return 100; "<br> "end "<br> ); // create stored procedure<br><br> stored_proc(); // invoking stored procedure<br> }<br> catch(otl_exception& p){ // intercept OTL exceptions<br> cerr<<p.msg<<endl; // print out error message<br> cerr<<p.code<<endl; // print out error code<br> cerr<<p.var_info<<endl; // print out the variable that caused the error<br> cerr<<p.sqlstate<<endl; // print out SQLSTATE message<br> cerr<<p.stm_text<<endl; // print out SQL that caused the error<br> }<br> db.logoff(); // disconnect from the data source<br> return 0;<br>} <br><br><br></pre>
<h2>Output</h2>
<pre>RC=100, A=2, B=Test String1<br><hr width="100%"></pre>
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<p>Copyright © 1996, 2008, Sergei Kuchin, email: <a
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