140 lines
7.0 KiB
HTML
140 lines
7.0 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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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 http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Multiple-row FETCH using a host structure array" />
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<meta name="abstract" content="To use the multiple-row FETCH with the host structure array, the application must define a host structure array that can be used by SQL." />
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<meta name="description" content="To use the multiple-row FETCH with the host structure array, the application must define a host structure array that can be used by SQL." />
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<meta name="DC.subject" content="FETCH statement, using host structure array, statements, FETCH" />
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<meta name="keywords" content="FETCH statement, using host structure array, statements, FETCH" />
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<meta name="DC.Relation" scheme="URI" content="rbafymrfetch.htm" />
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<meta name="DC.Relation" scheme="URI" content="../db2/rbafzmstsqlcca.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Multiple-row FETCH using a host structure array</title>
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</head>
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<body id="rbafymultifetch1"><a name="rbafymultifetch1"><!-- --></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">Multiple-row FETCH using a host structure array</h1>
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<div><p>To use the multiple-row FETCH with the host structure array, the
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application must define a host structure array that can be used by SQL.</p>
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<div class="section"><p>Each language has its own conventions and rules for defining a
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host structure array. Host structure arrays can be defined by using variable
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declarations or by using compiler directives to retrieve External File Descriptions
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(such as the COBOL COPY directive).</p>
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</div>
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<div class="section"><p>The host structure array consists of an array of structures. Each
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structure corresponds to one row of the result table. The first structure
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in the array corresponds to the first row, the second structure in the array
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corresponds to the second row, and so on. SQL determines the attributes of
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elementary items in the host structure array based on the declaration of the
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host structure array. To maximize performance, the attributes of the items
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that make up the host structure array should match the attributes of the columns
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being retrieved.</p>
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</div>
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<div class="section"><p>Consider the following COBOL example:</p>
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<div class="p"><div class="note"><span class="notetitle">Note:</span> By using the
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code examples, you agree to the terms of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
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</div>
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<pre>
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EXEC SQL <strong>INCLUDE SQLCA</strong>
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END-EXEC.
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…
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01 TABLE-1.
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02 DEPT OCCURS 10 TIMES.
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05 EMPNO PIC X(6).
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05 LASTNAME.
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49 LASTNAME-LEN PIC S9(4) BINARY.
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49 LASTNAME-TEXT PIC X(15).
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05 WORKDEPT PIC X(3).
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05 JOB PIC X(8).
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01 TABLE-2.
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02 IND-ARRAY OCCURS 10 TIMES.
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05 INDS PIC S9(4) BINARY OCCURS 4 TIMES.
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…
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EXEC SQL
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<strong>DECLARE</strong> D11 <strong>CURSOR FOR</strong>
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<strong>SELECT</strong> EMPNO, LASTNAME, WORKDEPT, JOB
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<strong>FROM</strong> CORPDATA.EMPLOYEE
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<strong>WHERE</strong> WORKDEPT = "D11"
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END-EXEC.
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…
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EXEC SQL
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<strong>OPEN</strong> D11
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END-EXEC.
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PERFORM FETCH-PARA UNTIL SQLCODE NOT EQUAL TO ZERO.
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ALL-DONE.
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EXEC SQL <strong>CLOSE</strong> D11 END-EXEC.
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…
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FETCH-PARA.
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EXEC SQL <strong>WHENEVER NOT FOUND GO TO</strong> ALL-DONE END-EXEC.
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EXEC SQL <strong>FETCH</strong> D11 <strong>FOR</strong> 10 <strong>ROWS INTO</strong> :DEPT :IND-ARRAY
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END-EXEC.
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…
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</pre>
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</div>
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<div class="section"><p>In this example, a cursor was defined for the CORPDATA.EMPLOYEE
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table to select all rows where the WORKDEPT column equals 'D11'. The result
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table contains eight rows. The DECLARE CURSOR and OPEN statements do not have
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any special syntax when they are used with a multiple-row FETCH statement.
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Another FETCH statement that returns a single row against the same cursor
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can be coded elsewhere in the program. The multiple-row FETCH statement is
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used to retrieve all of the rows in the result table. Following the FETCH,
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the cursor position remains on the last row retrieved.</p>
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</div>
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<div class="section"><p>The host structure array DEPT and the associated indicator array
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IND-ARRAY are defined in the application. Both arrays have a dimension of
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ten. The indicator array has an entry for each column in the result table.</p>
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</div>
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<div class="section"><p>The attributes of type and length of the DEPT host structure array
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elementary items match the columns that are being retrieved.</p>
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</div>
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<div class="section"><p>When the multiple-row FETCH statement has successfully completed,
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the host structure array contains the data for all eight rows. The indicator
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array, IND_ARRAY, contains zeros for every column in every row because no
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NULL values were returned.</p>
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</div>
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<div class="section"><p>The SQLCA that is returned to the application contains the following
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information:</p>
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<ul><li>SQLCODE contains 0</li>
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<li>SQLSTATE contains '00000'</li>
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<li>SQLERRD3 contains 8, the number of rows fetched</li>
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<li>SQLERRD4 contains 34, the length of each row</li>
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<li>SQLERRD5 contains +100, indicating the last row in the result table is
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in the block</li>
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</ul>
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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="rbafymrfetch.htm" title="The multiple-row FETCH statement can be used to retrieve multiple rows from a table or view with a single FETCH. The program controls the blocking of rows by the number of rows requested on the FETCH statement (OVRDBF has no effect).">Use the multiple-row FETCH statement</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../db2/rbafzmstsqlcca.htm">SQLCA (SQL communications area)</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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