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270 lines
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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">HLL program input and output operations with <span class="keyword">i5/OS</span> DDM</h1>
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<div><p>The high-level language operations are supported by DDM for keyed
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or nonkeyed operations.</p>
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<div class="section"><p>See the information in the following tables.</p>
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</div>
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<table cellpadding="4" cellspacing="0" border="1" class="tableborder"><tr><td>
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<a name="rbae5hllinout__rbae5langtbl"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rbae5hllinout__rbae5langtbl" width="100%" border="0"><caption>Table 1. High-level language operations supported by DDM for keyed or nonkeyed
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operations</caption><thead align="left"><tr><th rowspan="2" align="left" valign="bottom" width="25%" id="d0e117"> <span class="keyword">i5/OS™</span> database
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operation</th>
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<th colspan="4" align="center" valign="bottom" id="d0e123">High-level
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languages</th>
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</tr>
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<tr><th align="left" valign="bottom" width="25%" id="d0e126">ILE RPG programming language</th>
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<th align="left" valign="bottom" width="25%" id="d0e128">ILE COBOL programming language</th>
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<th align="left" valign="bottom" width="12.592592592592592%" id="d0e130"> BASIC</th>
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<th align="left" valign="bottom" width="12.407407407407407%" id="d0e132"> PL/I</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="25%" headers="d0e117 ">Open file</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e126 ">OPEN</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e128 ">OPEN</td>
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<td align="left" valign="top" width="12.592592592592592%" headers="d0e123 d0e130 ">OPEN</td>
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<td align="left" valign="top" width="12.407407407407407%" headers="d0e123 d0e132 ">OPEN</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e117 ">Query file</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e126 "> </td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e128 "> </td>
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<td align="left" valign="top" width="12.592592592592592%" headers="d0e123 d0e130 "> </td>
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<td align="left" valign="top" width="12.407407407407407%" headers="d0e123 d0e132 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e117 ">Read (keyed access)</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e126 ">CHAIN (key)</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e128 ">READ INVALID KEY</td>
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<td align="left" valign="top" width="12.592592592592592%" headers="d0e123 d0e130 ">READ KEY</td>
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<td align="left" valign="top" width="12.407407407407407%" headers="d0e123 d0e132 ">READ EQUAL</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e117 ">Read first/last<sup>1</sup></td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e126 ">*LOVAL *HIVAL</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e128 ">READ FIRST LAST</td>
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<td align="left" valign="top" width="12.592592592592592%" headers="d0e123 d0e130 ">READ FIRST LAST</td>
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<td align="left" valign="top" width="12.407407407407407%" headers="d0e123 d0e132 ">READ FIRST LAST</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e117 ">Read next</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e126 ">READ READE<sup>2</sup></td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e128 ">READ <NEXT> AT END</td>
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<td align="left" valign="top" width="12.592592592592592%" headers="d0e123 d0e130 ">READ</td>
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<td align="left" valign="top" width="12.407407407407407%" headers="d0e123 d0e132 ">READ NEXT</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e117 ">Read previous</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e126 ">READP</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e128 ">READ PRIOR AT END</td>
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<td align="left" valign="top" width="12.592592592592592%" headers="d0e123 d0e130 ">READ PRIOR</td>
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<td align="left" valign="top" width="12.407407407407407%" headers="d0e123 d0e132 ">READ PRV</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e117 ">Read next or previous<sup>3</sup> Next
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equal Previous equal Next unique Previous unique</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e126 "> </td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e128 "> </td>
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<td align="left" valign="top" width="12.592592592592592%" headers="d0e123 d0e130 ">READ = =, PRIOR</td>
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<td align="left" valign="top" width="12.407407407407407%" headers="d0e123 d0e132 ">READ NXTEQL PRVEQL NXTUNQ PRVUNQ</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e117 ">Read (relative to start)<sup>4</sup></td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e126 ">CHAIN (rrn)</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e128 ">READ RELATIVE KEY</td>
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<td align="left" valign="top" width="12.592592592592592%" headers="d0e123 d0e130 ">READ REC=</td>
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<td align="left" valign="top" width="12.407407407407407%" headers="d0e123 d0e132 ">READ KEY</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e117 ">Release record lock</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e126 ">EXCPT or next I/O op</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e128 ">(next I/O op)</td>
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<td align="left" valign="top" width="12.592592592592592%" headers="d0e123 d0e130 ">(next I/O op)</td>
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<td align="left" valign="top" width="12.407407407407407%" headers="d0e123 d0e132 ">(next I/O op)</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e117 ">Force end of data</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e126 ">FEOD</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e128 "> </td>
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<td align="left" valign="top" width="12.592592592592592%" headers="d0e123 d0e130 "> </td>
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<td align="left" valign="top" width="12.407407407407407%" headers="d0e123 d0e132 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e117 ">Position file<sup>5</sup></td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e126 ">SETGT SETLL</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e128 ">START KEY GREATER KEY NOT LESS KEY EQUAL</td>
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<td align="left" valign="top" width="12.592592592592592%" headers="d0e123 d0e130 ">RESTORE</td>
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<td align="left" valign="top" width="12.407407407407407%" headers="d0e123 d0e132 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e117 ">Update record</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e126 ">UPDAT</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e128 ">REWRITE<sup>6</sup></td>
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<td align="left" valign="top" width="12.592592592592592%" headers="d0e123 d0e130 ">REWRITE</td>
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<td align="left" valign="top" width="12.407407407407407%" headers="d0e123 d0e132 ">REWRITE</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e117 ">Write record</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e126 ">WRITE/ EXCPT</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e128 ">WRITE<sup>6</sup></td>
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<td align="left" valign="top" width="12.592592592592592%" headers="d0e123 d0e130 ">WRITE</td>
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<td align="left" valign="top" width="12.407407407407407%" headers="d0e123 d0e132 ">WRITE</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e117 ">Delete record</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e126 ">DELET</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e128 ">DELETE<sup>6</sup></td>
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<td align="left" valign="top" width="12.592592592592592%" headers="d0e123 d0e130 ">DELETE</td>
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<td align="left" valign="top" width="12.407407407407407%" headers="d0e123 d0e132 ">DELETE</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e117 ">Close file</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e126 ">CLOSE</td>
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<td align="left" valign="top" width="25%" headers="d0e123 d0e128 ">CLOSE</td>
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<td align="left" valign="top" width="12.592592592592592%" headers="d0e123 d0e130 ">CLOSE</td>
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<td align="left" valign="top" width="12.407407407407407%" headers="d0e123 d0e132 ">CLOSE</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e117 "> </td>
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<td valign="top" width="25%" headers="d0e123 d0e126 "> </td>
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<td valign="top" width="25%" headers="d0e123 d0e128 "> </td>
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<td valign="top" width="12.592592592592592%" headers="d0e123 d0e130 "> </td>
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<td valign="top" width="12.407407407407407%" headers="d0e123 d0e132 "> </td>
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</tr>
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<tr><td colspan="5" align="left" valign="top" headers="d0e117 d0e123 d0e126 d0e128 d0e130 d0e132 "> <dl><dt class="dlterm"><sup>1</sup></dt>
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<dd>For the ILE RPG language, if the keyed access path of a file specifies
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DESCENDING, then *LOVAL gets the last record in the file and *HIVAL gets the
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first record in the file.</dd>
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<dt class="dlterm"><sup>2</sup></dt>
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<dd>For duplicate keyed files, the ILE RPG language performs a READ NEXT operation
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and compares the key of the returned record to determine if the record qualifies.
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If so, the record is returned to the program; if not, an end-of-file indication
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is returned.</dd>
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<dt class="dlterm"><sup>3</sup></dt>
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<dd>If the remote file is on a non-<span class="keyword">iSeries™ server</span>,
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these operations cannot be performed using DDM.</dd>
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<dt class="dlterm"><sup>4</sup></dt>
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<dd>An <span class="keyword">iSeries</span> application
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program can open a <em>keyed</em> access open data path to a file and then access
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its records using both keyed and <em>relative record</em> access methods. Although
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DDM supports the <em>combined-access</em> access method, a target server (such
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as <span class="keyword">System/36™</span>) might not. In
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this case, the <span class="keyword">i5/OS</span> can
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do relative record accessing of a keyed file on a non-<span class="keyword">iSeries</span> target
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server if the target server supports the <em>combined-by-record-number</em> access
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method and if the DDM file specifies that method. The combined-by-record-number
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access method is specified on an <span class="keyword">iSeries server</span> as
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ACCMTH(*ARRIVAL *BOTH) on the <span class="cmdname">Create DDM File (CRTDDMF)</span> command.
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If these values are not specified for the DDM file and the target server does
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not support the combined-access access method, relative record operations
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to a keyed file are rejected.</dd>
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<dt class="dlterm"><sup>5</sup></dt>
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<dd>Positioning operations (SET<var class="varname">xx</var> in the ILE RPG language,
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or START in the ILE COBOL language) do not return the record data to the application
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program. These operations also cause the file to be opened for random processing.</dd>
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<dt class="dlterm"><sup>6</sup></dt>
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<dd>ILE COBOL operations that change indexed or relative files can lock the
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record before the operation to make the record eligible.</dd>
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</dl>
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</td>
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</tr>
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</tbody>
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</table>
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</td></tr></table>
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<div class="tablenoborder"><a name="rbae5hllinout__rbae5lantbl2"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rbae5hllinout__rbae5lantbl2" width="100%" frame="border" border="1" rules="all"><caption>Table 2. High-level language operations supported by DDM for keyed or nonkeyed
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operations</caption><thead align="left"><tr><th rowspan="2" align="left" valign="bottom" width="33.33333333333333%" id="d0e407"> <span class="keyword">i5/OS</span> database
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operation</th>
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<th colspan="2" align="center" valign="bottom" id="d0e413">High-level
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languages</th>
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</tr>
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<tr><th align="left" valign="bottom" width="33.33333333333333%" id="d0e416">CL</th>
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<th align="left" valign="bottom" width="33.33333333333333%" id="d0e418">ILE C programming language</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e407 ">Open file</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e416 ">OPNDBF</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e418 ">FOPEN, FREOPEN</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e407 ">Query file</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e416 ">OPNQRYF</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e418 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e407 ">Read (keyed access)</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e416 "> </td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e418 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e407 ">Read first/last</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e416 "> </td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e418 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e407 ">Read next</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e416 ">RCVF</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e418 ">FREAD, FGETC</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e407 ">Read previous</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e416 "> </td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e418 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e407 ">Read next or previous: Next equal Previous
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equal Next unique Previous unique</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e416 "> </td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e418 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e407 ">Read (relative to start)</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e416 "> </td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e418 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e407 ">Release record lock</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e416 "> </td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e418 ">(next I/O op)</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e407 ">Force end of data</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e416 "> </td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e418 ">FFLUSH</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e407 ">Position file</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e416 ">POSDBF</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e418 ">FSEEK, FSETPOS</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e407 ">Update record</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e416 "> </td>
|
||
<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e418 ">FWRITE, FPUTC, FFLUSH</td>
|
||
</tr>
|
||
<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e407 ">Write record</td>
|
||
<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e416 "> </td>
|
||
<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e418 ">FWRITE, FPUTC, FFLUSH</td>
|
||
</tr>
|
||
<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e407 ">Delete record</td>
|
||
<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e416 "> </td>
|
||
<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e418 "> </td>
|
||
</tr>
|
||
<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e407 ">Close file</td>
|
||
<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e416 ">CLOF</td>
|
||
<td align="left" valign="top" width="33.33333333333333%" headers="d0e413 d0e418 ">FCLOSE</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</div>
|
||
</div>
|
||
<div>
|
||
<div class="familylinks">
|
||
<div class="parentlink"><strong>Parent topic:</strong> <a href="rbae5ddmall.htm" title="DDM files can be used as data files or source files by high-level language (HLL) programs.">DDM considerations for all languages</a></div>
|
||
</div>
|
||
</div>
|
||
</body>
|
||
</html> |