101 lines
7.3 KiB
HTML
101 lines
7.3 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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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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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="concept" />
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<meta name="DC.Title" content="Retrieve ResultSet data" />
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<meta name="abstract" content="The ResultSet object provides several methods for obtaining column data for a row. All are of the form get<Type>, where <Type> is a Java data type. Some examples of these methods include getInt, getLong, getString, getTimestamp, and getBlob. Nearly all of these methods take a single parameter that is either the column index within the ResultSet or the column name." />
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<meta name="description" content="The ResultSet object provides several methods for obtaining column data for a row. All are of the form get<Type>, where <Type> is a Java data type. Some examples of these methods include getInt, getLong, getString, getTimestamp, and getBlob. Nearly all of these methods take a single parameter that is either the column index within the ResultSet or the column name." />
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<meta name="DC.Relation" scheme="URI" content="rsltsets.htm" />
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<meta name="DC.Relation" scheme="URI" content="rsltchar.htm" />
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<meta name="DC.Relation" scheme="URI" content="rsltcurs.htm" />
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<meta name="DC.Relation" scheme="URI" content="rsltchng.htm" />
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<meta name="DC.Relation" scheme="URI" content="rsltclse.htm" />
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<meta name="DC.Relation" scheme="URI" content="resultex.htm" />
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<meta name="DC.Relation" scheme="URI" content="rsmd.htm" />
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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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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rsltdata" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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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>Retrieve ResultSet data</title>
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</head>
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<body id="rsltdata"><a name="rsltdata"><!-- --></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">Retrieve ResultSet data</h1>
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<div><p>The ResultSet object provides several methods for obtaining column
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data for a row. All are of the form get<<em>Type</em>>, where <<em>Type</em>>
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is a Java™ data
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type. Some examples of these methods include getInt, getLong, getString, getTimestamp,
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and getBlob. Nearly all of these methods take a single parameter that is either
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the column index within the ResultSet or the column name.</p>
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<p>ResultSet columns are numbered, starting with 1. If the column name is
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used and there is more than one column in the ResultSet with the same name,
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the first one is returned. There are some get<Type> methods that have
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additional parameters, such as the optional Calendar object, which can be
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passed to getTime, getDate, and getTimestamp. Refer to the Javadoc for the <a href="javaapi/api/java/sql/package-summary.html" target="_blank">java.sql
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package</a> for full details.</p>
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<p>For get methods that return objects, the return value is null when the
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column in the ResultSet is null. For primitive types, null cannot be returned.
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In these cases, the value is 0 or false. If an application must distinguish
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between null, and 0 or false, the wasNull method can be used immediately after
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the call. This method can then determine whether the value was an actual 0
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or false value, or if that value was returned because the ResultSet value
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was indeed null.</p>
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<p>See <a href="resultex.htm">Example: ResultSet interface for IBM<sup>®</sup> Developer
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Kit for Java</a> for an example on how to use the ResultSet
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interface.</p>
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<div class="section"><h4 class="sectiontitle">ResultSetMetaData support</h4><p>When the getMetaData method
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is called on a ResultSet object, the method returns a ResultSetMetaData object
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describing the columns of that ResultSet object. When the SQL statement being
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processed is unknown until runtime, the ResultSetMetaData can be used to determine
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what get methods should be used to retrieve the data. The following code example
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uses ResultSetMetaData to determine each column type in the result set:</p>
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<p><strong>Example:</strong> Use
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ResultSetMetaData to determine each column type in a result set</p>
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<p><strong>Note:</strong> Read
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the <a href="codedisclaimer.htm">Code example disclaimer</a> for important
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legal information.</p>
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<pre>ResultSet rs = stmt.executeQuery(sqlString);
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ResultSetMetaData rsmd = rs.getMetaData();
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int colType [] = new int[rsmd.getColumnCount()];
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for (int idx = 0, int col = 1; idx < colType.length; idx++, col++)
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colType[idx] = rsmd.getColumnType(col);</pre>
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<p>See <a href="rsmd.htm#rsmd">Example: ResultSetMetaData interface for IBM Developer Kit for Java</a> for
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an example of how to use the ResultSetMetaData interface. </p>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rsmd.htm">Example: ResultSetMetaData interface for IBM Developer Kit for Java</a></strong><br />
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</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rsltsets.htm" title="The ResultSet interface provides access to the results generated by running queries. Conceptually, data of a ResultSet can be thought of as a table with a specific number of columns and a specific number of rows. By default, the table rows are retrieved in sequence. Within a row, column values can be accessed in any order.">ResultSets</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rsltchar.htm" title="This topic discusses ResultSet characteristics such ResultSet types, concurrency, ability to close the ResultSet by committing the connection object, and specification of ResultSet characteristics.">ResultSet characteristics</a></div>
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<div><a href="rsltcurs.htm" title="The iSeries Java Database Connectivity (JDBC) drivers support scrollable ResultSets. With a scrollable ResultSet, you can process rows of data in any order using a number of cursor-positioning methods.">Cursor movement</a></div>
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<div><a href="rsltclse.htm" title="To create a ResultSet object, you can use executeQuery methods, or other methods. This article describes options for creating ResultSets.">Create ResultSets</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="rsltchng.htm" title="With the iSeries JDBC drivers, you can change ResultSets by performing several tasks.">Change ResultSets</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="resultex.htm" title="This is an example of how to use the ResultSet interface.">Example: ResultSet interface for IBM Developer Kit for Java</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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