87 lines
4.6 KiB
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87 lines
4.6 KiB
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<title>Use host structure arrays in COBOL applications that use SQL</title>
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<body id="rzajphoststrucarraycobol"><a name="rzajphoststrucarraycobol"><!-- --></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 host structure arrays in COBOL applications that use SQL</h1>
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<div><p>A host structure array is a named set of host variables that is
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defined in the program's Data Division and has an OCCURS clause. </p>
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<div class="section"><p>Host structure arrays have a maximum of two levels, even though
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the host structure can occur within a multiple level structure. A varying-length
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string requires another level, level 49. A host structure array name can be
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a group name whose subordinate levels name basic data items.</p>
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</div>
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<div class="section"><p>In these examples, the following are true: </p>
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<ul><li>All members in B-ARRAY must be valid.</li>
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<li>B-ARRAY cannot be qualified.</li>
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<li>B-ARRAY can only be used on the blocked form of the FETCH and INSERT statements.</li>
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<li>B-ARRAY is the name of an array of host structures containing items C1-VAR
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and C2-VAR.</li>
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<li>The SYNCHRONIZED attribute must not be specified.</li>
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<li>C1-VAR and C2-VAR are not valid host variables in any SQL statement. A
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structure cannot contain an intermediate level structure.</li>
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</ul>
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<pre>01 A-STRUCT.
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02 B-ARRAY OCCURS 10 TIMES.
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03 C1-VAR PIC X(20).
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03 C2-VAR PIC S9(4).
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</pre>
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</div>
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<div class="section"><p>To retrieve 10 rows from the CORPDATA.DEPARTMENT table, use the
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following example:</p>
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<pre>01 TABLE-1.
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02 DEPT OCCURS 10 TIMES.
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05 DEPTNO PIC X(3).
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05 DEPTNAME.
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49 DEPTNAME-LEN PIC S9(4) BINARY.
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49 DEPTNAME-TEXT PIC X(29).
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05 MGRNO PIC X(6).
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05 ADMRDEPT PIC X(3).
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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> C1 <strong>CURSOR FOR</strong>
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<strong>SELECT</strong> *
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<strong>FROM</strong> CORPDATA.DEPARTMENT
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END-EXEC.
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....
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EXEC SQL
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<strong>FETCH</strong> C1 <strong>FOR</strong> 10 <strong>ROWS INTO</strong> :DEPT :IND-ARRAY
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END-EXEC.</pre>
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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="rzajphoststructurecobol.htm" title="A host structure is a named set of host variables that is defined in your program's DATA DIVISION.">Use host structures in COBOL applications that use SQL</a></div>
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