105 lines
4.9 KiB
HTML
105 lines
4.9 KiB
HTML
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<meta name="DC.Title" content="Use embedded CALL statement with an SQLDA" />
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<meta name="abstract" content="In either type of embedded CALL (where a procedure definition may or may not exist), an SQLDA may be passed rather than a parameter list." />
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<meta name="description" content="In either type of embedded CALL (where a procedure definition may or may not exist), an SQLDA may be passed rather than a parameter list." />
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<meta name="DC.subject" content="stored procedures, embedded CALL, with SQLDA, CALL statement, stored procedure, with SQLDA, statements, CALL, examples, embedded CALL" />
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<meta name="keywords" content="stored procedures, embedded CALL, with SQLDA, CALL statement, stored procedure, with SQLDA, statements, CALL, examples, embedded CALL" />
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<title>Use embedded CALL statement with an SQLDA</title>
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</head>
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<body id="rbafycalldrda"><a name="rbafycalldrda"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Use embedded CALL statement with an SQLDA</h1>
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<div><p>In either type of embedded CALL (where a procedure definition may
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or may not exist), an SQLDA may be passed rather than a parameter list.</p>
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<div class="section"><p>The following C examples illustrates this. Assume that the stored
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procedure is expecting 2 parameters, the first of type SHORT INT and the second
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of type CHAR with a length of 4. </p>
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<div class="note"><span class="notetitle">Note:</span> By using the code examples, you
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agree to the terms of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
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<pre>#define SQLDA_HV_ENTRIES 2
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#define SHORTINT 500
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#define NUL_TERM_CHAR 460
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exec sql include sqlca;
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exec sql include sqlda;
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…
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typedef struct sqlda Sqlda;
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typedef struct sqlda* Sqldap;
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…
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main()
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{
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Sqldap dap;
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short col1;
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char col2[4];
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int bc;
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dap = (Sqldap) malloc(bc=SQLDASIZE(SQLDA_HV_ENTRIES));
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/* SQLDASIZE is a macro defined in the sqlda include */
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col1 = 431;
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strcpy(col2,"abc");
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strncpy(dap->sqldaid,"SQLDA ",8);
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dap->sqldabc = bc; /* bc set in the malloc statement above */
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dap->sqln = SQLDA_HV_ENTRIES;
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dap->sqld = SQLDA_HV_ENTRIES;
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dap->sqlvar[0].sqltype = SHORTINT;
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dap->sqlvar[0].sqllen = 2;
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dap->sqlvar[0].sqldata = (char*) &col1;
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dap->sqlvar[0].sqlname.length = 0;
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dap->sqlvar[1].sqltype = NUL_TERM_CHAR;
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dap->sqlvar[1].sqllen = 4;
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dap->sqlvar[1].sqldata = col2;
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…
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EXEC SQL <strong>CALL</strong> P1 <strong>USING</strong> <strong>DESCRIPTOR</strong> :*dap;
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…
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}</pre>
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</div>
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<div class="section"><p>The name of the called procedure may also be stored in a host
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variable and the host variable used in the CALL statement, instead of the
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hard-coded procedure name. For example: </p>
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<pre>…
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main()
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{
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char proc_name[15];
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…
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strcpy (proc_name, "MYLIB.P3");
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…
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EXEC SQL <strong>CALL</strong> :proc_name ...;
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…
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}</pre>
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</div>
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<div class="section"><p>In the above example, if MYLIB.P3 is expecting parameters, then
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either a parameter list or an SQLDA passed with the USING DESCRIPTOR clause
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may be used, as shown in the previous example.</p>
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</div>
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<div class="section"><p>When a host variable containing the procedure name is used in
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the CALL statement and a CREATE PROCEDURE catalog definition exists, it will
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be used. The procedure name cannot be specified as a parameter marker.</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbafyinvokeproc.htm" title="The SQL CALL statement calls a stored procedure.">Invoke a stored procedure</a></div>
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</div>
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</div>
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</body>
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</html>
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