126 lines
8.2 KiB
HTML
126 lines
8.2 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE html
|
|
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html lang="en-us" xml:lang="en-us">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<meta name="security" content="public" />
|
|
<meta name="Robots" content="index,follow" />
|
|
<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))' />
|
|
<meta name="DC.Type" content="task" />
|
|
<meta name="DC.Title" content="Change ResultSets" />
|
|
<meta name="abstract" content="With the iSeries JDBC drivers, you can change ResultSets by performing several tasks." />
|
|
<meta name="description" content="With the iSeries JDBC drivers, you can change ResultSets by performing several tasks." />
|
|
<meta name="DC.Relation" scheme="URI" content="rsltsets.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="rsltchar.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="rsltcurs.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="rsltdata.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="rsltclse.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="resultex.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="usingpositioneddelete.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="usingpositionedupdate.htm" />
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2006" />
|
|
<meta name="DC.Format" content="XHTML" />
|
|
<meta name="DC.Identifier" content="rsltchng" />
|
|
<meta name="DC.Language" content="en-us" />
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
|
<!-- US Government Users Restricted Rights -->
|
|
<!-- Use, duplication or disclosure restricted by -->
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
|
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
|
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
|
<title>Change ResultSets</title>
|
|
</head>
|
|
<body id="rsltchng"><a name="rsltchng"><!-- --></a>
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
|
<h1 class="topictitle1">Change ResultSets</h1>
|
|
<div><p>With the iSeries™ JDBC drivers, you can change ResultSets by
|
|
performing several tasks.</p>
|
|
<div class="section"><p>The default setting for ResultSets is read only. However, with Java™ Database
|
|
Connectivity (JDBC) 2.0, the iSeries JDBC drivers provide complete support for
|
|
updateable ResultSets.</p>
|
|
<p>You can refer to ResultSet <a href="rsltchar.htm">concurrency</a> on
|
|
how to update ResultSets.</p>
|
|
<p><strong>Update rows</strong></p>
|
|
<p>Rows may be updated
|
|
in a database table through the ResultSet interface. The steps involved in
|
|
this process are the following:</p>
|
|
</div>
|
|
<ol><li><span>Change the values for a specific row using various update<<em>Type</em>>
|
|
methods, where <<em>Type</em>> is a Java data type. These update<<em>Type</em>>
|
|
methods correspond to the get<<em>Type</em>> methods available for retrieving
|
|
values.</span></li>
|
|
<li><span>Apply the rows to the underlying database.</span></li>
|
|
</ol>
|
|
<div class="section"><p>The database itself is not updated until the second step. Updating
|
|
columns in a ResultSet without calling the updateRow method does not make
|
|
any changes to the database.</p>
|
|
<p>Planned updates to a row can be thrown
|
|
away with the cancelUpdates method. Once the updateRow method is called, changes
|
|
to the database are final and cannot be undone.</p>
|
|
<p><strong>Note:</strong> The rowUpdated
|
|
method always returns false as the database does not have a way to point out
|
|
which rows have been updated. Correspondingly, the updatesAreDetected method
|
|
returns false.</p>
|
|
<p><strong>Delete rows</strong></p>
|
|
<p>Rows may be deleted in a database
|
|
table through the ResultSet interface. The deleteRow method is provided and
|
|
deletes the current row.</p>
|
|
<p><strong>Insert rows</strong></p>
|
|
<p>Rows may be inserted
|
|
into a database table through the ResultSet interface. This process makes
|
|
use of an "insert row" which applications specifically move the cursor to
|
|
and build the values they want to insert into the database. The steps involved
|
|
in this process are as follows:</p>
|
|
<ol><li>Position the cursor on the insert row.</li>
|
|
<li>Set each of the values for the columns in the new row.</li>
|
|
<li>Insert the row into the database and optionally move the cursor back to
|
|
the current row within the ResultSet.</li>
|
|
</ol>
|
|
<div class="note"><span class="notetitle">Note:</span> New rows are not inserted into the table where the cursor is positioned.
|
|
They are typically added to the end of the table data space. A relational
|
|
database is not position-dependent by default. For example, you should not
|
|
expect to move the cursor to the third row and insert something that shows
|
|
up before the forth row when subsequent users fetch the data.</div>
|
|
<p><strong>Support
|
|
for positioned updates</strong></p>
|
|
<p>Besides the method for updating the database
|
|
through a ResultSet, SQL statements can be used to issue positioned updates.
|
|
This support relies on using named cursors. JDBC provides the setCursorName
|
|
method from Statement and the getCursorName method from ResultSet to provide
|
|
access to these values.</p>
|
|
<p>Two DatabaseMetaData methods, supportsPositionedUpdated
|
|
and supportsPositionedDelete, both return true as this feature is supported
|
|
with the native JDBC driver.</p>
|
|
<p>See <a href="usingpositionedupdate.htm">Example:
|
|
Change values with a statement through another statement's cursor</a> for
|
|
more information.</p>
|
|
<p>See <a href="usingpositioneddelete.htm">Example:
|
|
Remove values from a table through another statement's cursor</a> for more
|
|
information. </p>
|
|
</div>
|
|
</div>
|
|
<div>
|
|
<ul class="ullinks">
|
|
<li class="ulchildlink"><strong><a href="usingpositioneddelete.htm">Example: Remove values from a table through another statement's cursor</a></strong><br />
|
|
This is an example of how to remove values from a table through another statement's cursor.</li>
|
|
<li class="ulchildlink"><strong><a href="usingpositionedupdate.htm">Example: Change values with a statement through another statement's cursor</a></strong><br />
|
|
This is an example of how to change values with a statement through another statement's cursor.</li>
|
|
</ul>
|
|
|
|
<div class="familylinks">
|
|
<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>
|
|
</div>
|
|
<div class="relconcepts"><strong>Related concepts</strong><br />
|
|
<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>
|
|
<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>
|
|
<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>
|
|
<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>
|
|
</div>
|
|
<div class="relref"><strong>Related reference</strong><br />
|
|
<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>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html> |