80 lines
5.8 KiB
HTML
80 lines
5.8 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<meta name="DC.Title" content="FieldDescription classes" />
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<meta name="abstract" content="The field description classes allow the Java program to describe the contents of a field or parameter with a data type and a string containing the name of the field. If the program is working with data from record-level access, it can also specify any iSeries data definition specification (DDS) keywords that further describe the field." />
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<meta name="description" content="The field description classes allow the Java program to describe the contents of a field or parameter with a data type and a string containing the name of the field. If the program is working with data from record-level access, it can also specify any iSeries data definition specification (DDS) keywords that further describe the field." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<title>FieldDescription classes</title>
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<body id="dtadfld"><a name="dtadfld"><!-- --></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">FieldDescription classes</h1>
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<div><p>The field description classes allow the Java™ program to describe the contents of
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a field or parameter with a data type and a string containing the name of
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the field. If the program is working with data from record-level access, it
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can also specify any iSeries™ data definition specification (DDS) keywords
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that further describe the field.</p>
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<div class="section"><p><a href="javadoc/com/ibm/as400/access/FieldDescription.html#NAVBAR_TOP">Field description</a> classes</p>
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<p>The field description
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classes are as follows:</p>
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<ul><li><a href="javadoc/com/ibm/as400/access/BinaryFieldDescription.html#NAVBAR_TOP"> BinaryFieldDescription</a></li>
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<li><a href="javadoc/com/ibm/as400/access/CharacterFieldDescription.html#NAVBAR_TOP"> CharacterFieldDescription</a></li>
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<li><a href="javadoc/com/ibm/as400/access/DateFieldDescription.html#NAVBAR_TOP"> DateFieldDescription</a></li>
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<li><a href="javadoc/com/ibm/as400/access/DBCSEitherFieldDescription.html#NAVBAR_TOP"> DBCSEitherFieldDescription</a></li>
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<li><a href="javadoc/com/ibm/as400/access/DBCSGraphicFieldDescription.html#NAVBAR_TOP"> DBCSGraphicFieldDescription</a></li>
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<li><a href="javadoc/com/ibm/as400/access/DBCSOnlyFieldDescription.html#NAVBAR_TOP"> DBCSOnlyFieldDescription</a></li>
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<li><a href="javadoc/com/ibm/as400/access/DBCSOpenFieldDescription.html#NAVBAR_TOP"> DBCSOpenFieldDescription</a></li>
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<li><a href="javadoc/com/ibm/as400/access/FloatFieldDescription.html#NAVBAR_TOP"> FloatFieldDescription</a></li>
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<li><a href="javadoc/com/ibm/as400/access/HexFieldDescription.html#NAVBAR_TOP"> HexFieldDescription</a></li>
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<li><a href="javadoc/com/ibm/as400/access/PackedDecimalFieldDescription.html#NAVBAR_TOP"> PackedDecimalFieldDescription</a></li>
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<li><a href="javadoc/com/ibm/as400/access/TimeFieldDescription.html#NAVBAR_TOP"> TimeFieldDescription</a></li>
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<li><a href="javadoc/com/ibm/as400/access/TimestampFieldDescription.html#NAVBAR_TOP"> TimestampFieldDescription</a></li>
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<li><a href="javadoc/com/ibm/as400/access/ZonedDecimalFieldDescription.html#NAVBAR_TOP"> ZonedDecimalFieldDescription</a></li>
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</ul>
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</div>
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<div class="section"><h4 class="sectiontitle">Example: Creating field descriptions</h4><p>The following
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example assumes that the entries on a data queue have the same format. Each
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entry has a message number (AS400Bin4), a time stamp (8 characters), and message
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text (50 characters) that you can describe with field descriptions:</p>
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<pre> // Create a field description for the numeric data. Note it uses the
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// AS400Bin4 data type. It also names the field so it can be accessed by
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// name in the record class.
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BinaryFieldDescription bfd = new BinaryFieldDescription(new AS400Bin4(), "msgNumber");
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// Create a field description for the character data. Note it uses the
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// AS400Text data type. It also names the field so it can be accessed by
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// name by the record class.
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CharacterFieldDescription cfd1 = new CharacterFieldDescription(new AS400Text(8), "msgTime");
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// Create a field description for the character data. Note it uses the
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// AS400Text data type. It also names the field so it can be accessed by
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// name by the record class.
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CharacterFieldDescription cfd2 = new CharacterFieldDescription(new AS400Text(50), "msgText");</pre>
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<p>You
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can now group the field descriptions in an instance of the RecordFormat class.
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To see how to add the field descriptions to a RecordFormat object, see the
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example on the following page:</p>
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<blockquote><a href="dtadrfmt.htm#dtadrfmt">RecordFormat class</a></blockquote>
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</div>
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</div>
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</body>
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