94 lines
4.8 KiB
HTML
94 lines
4.8 KiB
HTML
<?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 name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Setting the cursor position" />
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<meta name="abstract" content="" />
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<meta name="description" content="" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2006" />
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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>Setting the cursor position</title>
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</head>
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<body id="rlacurs"><a name="rlacurs"><!-- --></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">Setting the cursor position</h1>
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<div><p></p>
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<div class="section"><p>An open file has a cursor. The cursor points to the record to
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be read, updated, or deleted. When a file is first opened the cursor points
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to the beginning of the file. The beginning of the file is before the first
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record. Use the following methods to set the cursor position:</p>
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</div>
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<div class="section"><ul><li><a href="javadoc/com/ibm/as400/access/AS400File.html#POSITIONCURSORAFTERLAST()"> positionCursorAfterLast()</a> - Set cursor to after the
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last record. This method exists so Java™ programs can use the readPrevious()
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method to access records in the file.</li>
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<li><a href="javadoc/com/ibm/as400/access/AS400File.html#POSITIONCURSORBEFOREFIRST()"> positionCursorBeforeFirst()</a> - Set cursor to before the
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first record. This method exists so Java programs can use the readNext() method
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to access records in the file.</li>
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<li><a href="javadoc/com/ibm/as400/access/AS400File.html#POSITIONCURSORTOFIRST()"> positionCursorToFirst()</a> - Set the cursor to the first
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record.</li>
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<li><a href="javadoc/com/ibm/as400/access/AS400File.html#POSITIONCURSORTOLAST()"> positionCursorToLast()</a> - Set the cursor to the last
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record.</li>
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<li><a href="javadoc/com/ibm/as400/access/AS400File.html#POSITIONCURSORTONEXT()"> positionCursorToNext()</a> - Move the cursor to the next
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record.</li>
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<li><a href="javadoc/com/ibm/as400/access/AS400File.html#POSITIONCURSORTOPREVIOUS()"> positionCursorToPrevious()</a> - Move the cursor to the
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previous record.</li>
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</ul>
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</div>
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<div class="section"><p>The following example shows how to use the positionCursorToFirst()
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method to position the cursor.</p>
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</div>
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<div class="section"><div class="p"><pre> // Create an AS400 object, the file exists on this
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// server.
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AS400 sys = new AS400("mySystem.myCompany.com");
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// Create a file object that represents the file
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SequentialFile myFile = new SequentialFile(sys, "/QSYS.LIB/MYLIB.LIB/MYFILE.FILE/%FILE%.MBR");
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// Assume that the AS400FileRecordDescription class
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// was used to generate the code for a subclass of
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// RecordFormat that represents the record format
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// of file MYFILE in library MYLIB. The code was
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// compiled and is available for use by the Java
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// program.
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RecordFormat recordFormat = new MYFILEFormat();
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// Set the record format for myFile. This must
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// be done before invoking open()
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myFile.setRecordFormat(recordFormat);
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// Open the file.
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myFile.open(AS400File.READ_WRITE, 1, AS400File.COMMIT_LOCK_LEVEL_NONE);
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// I want to delete the first record of the file.
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myFile.positionCursorToFirst();
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myFile.deleteCurrentRecord();
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....
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// Close the file since I am done using it
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myFile.close();
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// Disconnect since I am done using
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// record-level access
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sys.disconnectService(AS400.RECORDACCESS);</pre>
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</div>
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</div>
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</div>
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</body>
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</html> |