141 lines
9.2 KiB
HTML
141 lines
9.2 KiB
HTML
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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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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Cursor movement" />
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<meta name="abstract" content="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." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<title>Cursor movement</title>
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</head>
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<body id="rsltcurs"><a name="rsltcurs"><!-- --></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">Cursor movement</h1>
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<div><p>The iSeries™ Java™ Database
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Connectivity (JDBC) drivers support scrollable ResultSets. With a scrollable
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ResultSet, you can process rows of data in any order using a number of cursor-positioning
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methods.</p>
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<p>The ResultSet.next method is used to move through a ResultSet one row at
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a time. With Java Database Connectivity (JDBC) 2.0, the iSeries JDBC
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drivers support scrollable ResultSets. Scrollable ResultSets allow processing
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the rows of data in any order by using the previous, absolute, relative, first,
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and last methods.</p>
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<p>By default, JDBC ResultSets are always forward only, meaning that the only
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valid cursor-positioning method to call is next(). You have to explicitly
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request a scrollable ResultSet. See <a href="rsltchar.htm">ResultSet types</a> for
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more information.</p>
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<p>With a scrollable ResultSet, you can use the following cursor-positioning
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methods:</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><thead align="left"><tr><th align="left" valign="top" width="16.666666666666664%" id="d0e39">Method</th>
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<th align="left" valign="top" width="83.33333333333334%" id="d0e41">Description</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" width="16.666666666666664%" headers="d0e39 ">Next</td>
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<td valign="top" width="83.33333333333334%" headers="d0e41 ">This method moves the cursor forward one row in the ResultSet. <p>The
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method returns true if the cursor is positioned on a valid row and false otherwise.</p>
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</td>
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</tr>
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<tr><td valign="top" width="16.666666666666664%" headers="d0e39 ">Previous</td>
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<td valign="top" width="83.33333333333334%" headers="d0e41 ">The method moves the cursor backward one row in the ResultSet. <p>The
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method returns true if the cursor is positioned on a valid row and false otherwise.</p>
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</td>
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</tr>
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<tr><td valign="top" width="16.666666666666664%" headers="d0e39 ">First</td>
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<td valign="top" width="83.33333333333334%" headers="d0e41 ">The method moves the cursor to the first row in the ResultSet. <p>The
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method returns true if the cursor is positioned on the first row and false
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if the ResultSet is empty.</p>
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</td>
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</tr>
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<tr><td valign="top" width="16.666666666666664%" headers="d0e39 ">Last</td>
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<td valign="top" width="83.33333333333334%" headers="d0e41 ">The method moves the cursor to the last row in the ResultSet. <p>The
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method returns true if the cursor is positioned on the last row and false
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if the ResultSet is empty.</p>
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</td>
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</tr>
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<tr><td valign="top" width="16.666666666666664%" headers="d0e39 ">BeforeFirst</td>
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<td valign="top" width="83.33333333333334%" headers="d0e41 ">The method moves the cursor immediately before the first row in the
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ResultSet. <p>For an empty ResultSet, this method has no effect. There is
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no return value from this method.</p>
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</td>
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</tr>
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<tr><td valign="top" width="16.666666666666664%" headers="d0e39 ">AfterLast</td>
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<td valign="top" width="83.33333333333334%" headers="d0e41 ">The method moves the cursor immediately after the last row in the ResultSet. <p>For
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an empty ResultSet, this method has no effect. There is no return value from
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this method.</p>
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</td>
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</tr>
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<tr><td valign="top" width="16.666666666666664%" headers="d0e39 ">Relative (int rows)</td>
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<td valign="top" width="83.33333333333334%" headers="d0e41 ">The method moves the cursor relative to its current position. <ul><li>If rows is 0, this method has no effect.</li>
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<li>If rows is positive, the cursor is moved forward that many rows. If there
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are fewer rows between the current position and the end of the ResultSet than
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specified by the input parameters, this method operates like afterLast.</li>
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<li>If rows is negative, the cursor is moved backward that many rows. If there
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are fewer rows between the current position and the end of the ResultSet than
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specified by the input parameter, this method operates like beforeFirst.</li>
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</ul>
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<p>The method returns true if the cursor in positioned on a valid row
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and false otherwise.</p>
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</td>
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</tr>
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<tr><td valign="top" width="16.666666666666664%" headers="d0e39 ">Absolute (int row)</td>
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<td valign="top" width="83.33333333333334%" headers="d0e41 ">The method moves the cursor to the row specified by row value. <p>If
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row value is positive, the cursor is positioned that many rows from the beginning
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of the ResultSet. The first row is numbered 1, the second is 2, and so on.
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If there are fewer rows in the ResultSet than specified by the row value,
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this method operates the same way as afterLast.</p>
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<p>If row value is negative,
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the cursor is positioned that many rows from the end of the ResultSet. The
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last row is numbered -1, the second to last is -2, and so on. If there are
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fewer rows in the ResultSet than specified by the row value, this method operates
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the same way beforeFirst.</p>
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<p>If row value is 0, this method operates
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the same way as beforeFirst.</p>
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<p>The method returns true if the cursor
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is positioned on a valid row and false otherwise.</p>
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</td>
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</tr>
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</tbody>
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</table>
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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="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="rsltdata.htm" title="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.">Retrieve ResultSet data</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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