383 lines
29 KiB
HTML
383 lines
29 KiB
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<meta name="DC.Identifier" content="crdb2cac" />
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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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<title>Create and populate a DB2CachedRowSet</title>
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</head>
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<body id="crdb2cac"><a name="crdb2cac"><!-- --></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">Create and populate a DB2CachedRowSet</h1>
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<div><p>There are several ways to place data into a DB2CachedRowSet.</p>
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<div class="section"><h4 class="sectiontitle">Use the populate method</h4><p>DB2CachedRowSets have a
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populate method that can be used to put data into the RowSet from a DB2ResultSet
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object. The following is an example of this approach.</p>
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<p><strong>Example:</strong> Use
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the populate method</p>
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<div class="note"><span class="notetitle">Note:</span> By using the code examples, you agree to the
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terms of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
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<pre>// Establish a connection to the database.
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Connection conn = DriverManager.getConnection("jdbc:db2:*local");
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// Create a statement and use it to perform a query.
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Statement stmt = conn.createStatement();
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ResultSet rs = stmt.executeQuery("select col1 from cujosql.test_table");
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// Create and populate a DB2CachedRowSet from it.
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DB2CachedRowSet crs = new DB2CachedRowSet();
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crs.populate(rs);
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// Note: Disconnect the ResultSet, Statement,
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// and Connection used to create the RowSet.
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rs.close();
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stmt.close();
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conn.close();
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// Loop through the data in the RowSet.
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while (crs.next()) {
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System.out.println("v1 is " + crs.getString(1));
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}
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crs.close();</pre>
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</div>
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<div class="section"><h4 class="sectiontitle">Use DB2CachedRowSet properties and DataSources</h4><p>DB2CachedRowSets
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have properties that allow the DB2CachedRowSets to accept an SQL query and
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a DataSource name. They then use the SQL query and DataSource name to create
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data for themselves. The following is an example of this approach. The reference
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to the DataSource named BaseDataSource is assumed to be a valid DataSource
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that has been previously set up.</p>
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<p><strong>Example:</strong> Use DB2CachedRowSet
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properties and DataSources</p>
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<div class="note"><span class="notetitle">Note:</span> Read the <a href="codedisclaimer.htm">Code
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example disclaimer</a> for important legal information.</div>
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<pre>// Create a new DB2CachedRowSet
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DB2CachedRowSet crs = new DB2CachedRowSet();
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// Set the properties that are needed for
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// the RowSet to use a DataSource to populate itself.
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crs.setDataSourceName("BaseDataSource");
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crs.setCommand("select col1 from cujosql.test_table");
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// Call the RowSet execute method. This causes
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// the RowSet to use the DataSource and SQL query
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// specified to populate itself with data. Once
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// the RowSet is populated, it disconnects from the database.
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crs.execute();
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// Loop through the data in the RowSet.
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while (crs.next()) {
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System.out.println("v1 is " + crs.getString(1));
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}
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// Eventually, close the RowSet.
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crs.close();</pre>
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</div>
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<div class="section"><h4 class="sectiontitle">Use DB2CachedRowSet properties and JDBC URLs</h4><p>DB2CachedRowSets
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have properties that allow the DB2CachedRowSets to accept an SQL query and
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a JDBC URL. They then use the query and JDBC URL to create data for themselves.
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The following is an example of this approach.</p>
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<p><strong>Example:</strong> Use DB2CachedRowSet
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properties and JDBC URLs</p>
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<div class="note"><span class="notetitle">Note:</span> Read the <a href="codedisclaimer.htm">Code
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example disclaimer</a> for important legal information.</div>
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<pre>// Create a new DB2CachedRowSet
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DB2CachedRowSet crs = new DB2CachedRowSet();
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// Set the properties that are needed for
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// the RowSet to use a JDBC URL to populate itself.
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crs.setUrl("jdbc:db2:*local");
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crs.setCommand("select col1 from cujosql.test_table");
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// Call the RowSet execute method. This causes
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// the RowSet to use the DataSource and SQL query
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// specified to populate itself with data. Once
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// the RowSet is populated, it disconnects from the database.
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crs.execute();
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// Loop through the data in the RowSet.
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while (crs.next()) {
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System.out.println("v1 is " + crs.getString(1));
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}
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// Eventually, close the RowSet.
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crs.close();</pre>
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</div>
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<div class="section"><h4 class="sectiontitle">Use the setConnection(Connection) method to use an existing
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database connection</h4><p>To promote the reuse of JDBC Connection objects,
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the DB2CachedRowSet provides a mechanism for passing an established Connection
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object to the DB2CachedRowSet that is used to populate the RowSet. If a user-supplied
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Connection object is passed in, the DB2CachedRowSet does not disconnect it
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after populating itself.</p>
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<p><strong>Example:</strong> Use setConnection(Connection)
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method to use an existing database connection</p>
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<div class="note"><span class="notetitle">Note:</span> Read the <a href="codedisclaimer.htm">Code
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example disclaimer</a> for important legal information.</div>
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<pre>// Establish a JDBC connection to the database.
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Connection conn = DriverManager.getConnection("jdbc:db2:*local");
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// Create a new DB2CachedRowSet
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DB2CachedRowSet crs = new DB2CachedRowSet();
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// Set the properties that are needed for the
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// RowSet to use an already connected connection
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// to populate itself.
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crs.setConnection(conn);
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crs.setCommand("select col1 from cujosql.test_table");
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// Call the RowSet execute method. This causes
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// the RowSet to use the connection that it was provided
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// with previously. Once the RowSet is populated, it does not
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// close the user-supplied connection.
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crs.execute();
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// Loop through the data in the RowSet.
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while (crs.next()) {
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System.out.println("v1 is " + crs.getString(1));
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}
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// Eventually, close the RowSet.
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crs.close();</pre>
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</div>
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<div class="section"><h4 class="sectiontitle">Use the execute(Connection) method to use an existing database
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connection</h4><p>To promote the reuse of JDBC Connection objects, the
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DB2CachedRowSet provides a mechanism for passing an established Connection
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object to the DB2CachedRowSet when the execute method is called. If a user-supplied
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Connection object is passed in, the DB2CachedRowSet does not disconnect it
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after populating itself.</p>
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<p><strong>Example:</strong> Use execute(Connection) method
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to use an existing database connection</p>
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<div class="note"><span class="notetitle">Note:</span> Read the <a href="codedisclaimer.htm">Code
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example disclaimer</a> for important legal information.</div>
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<pre>// Establish a JDBC connection to the database.
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Connection conn = DriverManager.getConnection("jdbc:db2:*local");
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// Create a new DB2CachedRowSet
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DB2CachedRowSet crs = new DB2CachedRowSet();
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// Set the SQL statement that is to be used to
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// populate the RowSet.
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crs.setCommand("select col1 from cujosql.test_table");
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// Call the RowSet execute method, passing in the connection
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// that should be used. Once the Rowset is populated, it does not
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// close the user-supplied connection.
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crs.execute(conn);
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// Loop through the data in the RowSet.
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while (crs.next()) {
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System.out.println("v1 is " + crs.getString(1));
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}
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// Eventually, close the RowSet.
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crs.close();</pre>
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</div>
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<div class="section"><h4 class="sectiontitle">Use the execute(int) method to group database requests</h4><p>To
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reduce the database's workload, the DB2CachedRowSet provides a mechanism for
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grouping SQL statements for several threads into one processing request for
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the database.</p>
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<p><strong>Example:</strong> Use execute(int) method to group database
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requests</p>
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<div class="note"><span class="notetitle">Note:</span> Read the <a href="codedisclaimer.htm">Code example disclaimer</a> for
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important legal information.</div>
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<pre>// Create a new DB2CachedRowSet
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DB2CachedRowSet crs = new DB2CachedRowSet();
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// Set the properties that are needed for
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// the RowSet to use a DataSource to populate itself.
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crs.setDataSourceName("BaseDataSource");
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crs.setCommand("select col1 from cujosql.test_table");
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// Call the RowSet execute method. This causes
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// the RowSet to use the DataSource and SQL query
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// specified to populate itself with data. Once
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// the RowSet is populated, it disconnects from the database.
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|
|
// This version of the execute method accepts the number of seconds
|
||
|
|
// that it is willing to wait for its results. By
|
||
|
|
// allowing a delay, the RowSet can group the requests
|
||
|
|
// of several users and only process the request against
|
||
|
|
// the underlying database once.
|
||
|
|
crs.execute(5);
|
||
|
|
|
||
|
|
// Loop through the data in the RowSet.
|
||
|
|
while (crs.next()) {
|
||
|
|
System.out.println("v1 is " + crs.getString(1));
|
||
|
|
}
|
||
|
|
|
||
|
|
// Eventually, close the RowSet.
|
||
|
|
crs.close(); </pre>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div>
|
||
|
|
<div class="familylinks">
|
||
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="db2cache.htm" title="The DB2CachedRowSet object is a disconnected RowSet, meaning that it can be used without being connected to the database. Its implementation adheres closely to the description of a CachedRowSet. The DB2CachedRowSet is a container for rows of data from a ResultSet. The DB2CachedRowSet holds all its own data so it does not need to maintain a connection to the database other than explicitly while reading or writing data to the database.">DB2CachedRowSet</a></div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="familylinks">
|
||
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="codeex.htm" title="The following is a list of code examples for the IBM Developer Kit for Java.">Code examples for the IBM Developer Kit for Java</a></div>
|
||
|
|
</div>
|
||
|
|
<div class="relconcepts"><strong>Related concepts</strong><br />
|
||
|
|
<div><a href="db2cause.htm" title="Because the DB2CachedRowSet object can be disconnected and serialized, it is useful in environments where it is not always practical to run a full JDBC driver (for example, on Personal Digital Assistants (PDAs) and Java-enabled cell phones).">Use DB2CachedRowSet</a></div>
|
||
|
|
<div><a href="db2cafea.htm" title="In addition to working like a ResultSet as several examples have shown, the DB2CachedRowSet class has some additional functionality that makes it more flexible to use. Methods are provided for turning either the entire Java Database Connectivity (JDBC) RowSet or just a portion of it into a Java collection. Moreover, because of their disconnected nature, DB2CachedRowSets do not have a strict one-to-one relationship with ResultSets.">Other DB2CachedRowSet features</a></div>
|
||
|
|
<div><a href="rzahapaseexmpls.htm" title="The IBM i5/OS PASE native method for Java example calls an instance of a native C method that then uses Java Native Interface (JNI) to call back into Java code. Rather than accessing the string directly from Java code, the example calls a native method that then calls back into Java through JNI to get the string value.">Example: IBM i5/OS PASE native method for Java</a></div>
|
||
|
|
</div>
|
||
|
|
<div class="reltasks"><strong>Related tasks</strong><br />
|
||
|
|
<div><a href="runjpdex.htm" title="You can either use the iSeries command line or the Qshell environment to run the Java Performance Data Converter (JPDC).">Example: Run the Java Performance Data Converter</a></div>
|
||
|
|
</div>
|
||
|
|
<div class="relref"><strong>Related reference</strong><br />
|
||
|
|
<div><a href="accdb2ca.htm" title="This topic provides information about accessing DB2CachedRowSet data and various cursor manipulation functions.">Access DB2CachedRowSet data and cursor manipulation</a></div>
|
||
|
|
<div><a href="chgdb2ca.htm" title="This topic provides information about making changes to rows in a DB2CachedRowSet and then updating the underlying database.">Change DB2CachedRowSet data and reflect changes back to the data source</a></div>
|
||
|
|
<div><a href="intdatex.htm" title="This example shows how you can use locales to format dates.">Example: Internationalization of dates using the java.util.DateFormat class</a></div>
|
||
|
|
<div><a href="intnumex.htm" title="This example shows how you can use locales to format numbers.">Example: Internationalization of numeric display using the java.util.NumberFormat class</a></div>
|
||
|
|
<div><a href="intlocex.htm" title="This example shows how you can use locales with resource bundles to internationalize program strings.">Example: Internationalization of locale-specific data using the java.util.ResourceBundle class</a></div>
|
||
|
|
<div><a href="accesspropertytest.htm" title="This is an example of how to use the Access property.">Example: Access property</a></div>
|
||
|
|
<div><a href="putgetblobs.htm" title="This is an example of how a BLOB can be put into the database or retrieved from the database.">Example: BLOB</a></div>
|
||
|
|
<div><a href="callex.htm" title="This is an example of how to use the CallableStatement interface.">Example: CallableStatement interface for IBM Developer Kit for Java</a></div>
|
||
|
|
<div><a href="usingpositioneddelete.htm" title="This is an example of how to remove values from a table through another statement's cursor.">Example: Remove values from a table through another statement's cursor</a></div>
|
||
|
|
<div><a href="putgetclobs.htm" title="This is an example of how a CLOB can be put into the database or retrieved from the database.">Example: CLOB</a></div>
|
||
|
|
<div><a href="udbdatasourcebind.htm" title="This is an example of how to create a UDBDataSource and get it bound with JNDI.">Example: Create a UDBDataSource and bind it with JNDI</a></div>
|
||
|
|
<div><a href="udbdatasourceuse2.htm" title="This is an example of how to create a UDBDataSource, and use the getConnection method to obtain a user ID and password at runtime.">Example: Create a UDBDataSource, and obtain a user ID and password</a></div>
|
||
|
|
<div><a href="udbdatasourcebind2.htm" title="This is an example of how to create a UDBDataSource, and set the user ID and password as DataSource properties.">Example: Create a UDBDataSourceBind and set DataSource properties</a></div>
|
||
|
|
<div><a href="dataex.htm" title="This example shows how to return a list of tables.">Example: DatabaseMetaData interface for IBM Developer Kit for Java - Return a list of tables</a></div>
|
||
|
|
<div><a href="putgetdatalinks.htm" title="This is an example of how to use datalinks in your applications.">Example: Datalink</a></div>
|
||
|
|
<div><a href="distinct.htm" title="This is an example of how to use distinct types.">Example: Distinct types</a></div>
|
||
|
|
<div><a href="sqljex.htm" title="The following example SQLJ application, App.sqlj, uses static SQL to retrieve and update data from the EMPLOYEE table of the DB2 sample database.">Example: Embed SQL Statements in your Java application</a></div>
|
||
|
|
<div><a href="jtatxend.htm" title="This is an example of ending a transaction in your application.">Example: End a transaction</a></div>
|
||
|
|
<div><a href="invalidconnect.htm" title="This is an example of how to use the Connection property in SQL naming mode.">Example: Invalid user ID and password</a></div>
|
||
|
|
<div><a href="basicjdbc.htm" title="This is an example of how to use the BasicJDBC program.">Example: JDBC</a></div>
|
||
|
|
<div><a href="jtamulticonn.htm" title="This is an example of how to use multiple connections working on a single transaction.">Example: Multiple connections that work on a transaction</a></div>
|
||
|
|
<div><a href="udbdatasourceuse.htm" title="The following example obtains an initial context before binding the UDBDataSource. The lookup method is then used on that context to return an object of type DataSource for the application to use.">Example: Obtain an initial context before binding UDBDataSource</a></div>
|
||
|
|
<div><a href="pmd.htm" title="This is an example of using the ParameterMetaData interface to retrieve information about parameters.">Example: ParameterMetaData</a></div>
|
||
|
|
<div><a href="usingpositionedupdate.htm" title="This is an example of how to change values with a statement through another statement's cursor.">Example: Change values with a statement through another statement's cursor</a></div>
|
||
|
|
<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><a href="sensitive2.htm" title="The following example shows how a change can affect a where clause of an SQL statement based on the sensitivity of the ResultSet.">Example: ResultSet sensitivity</a></div>
|
||
|
|
<div><a href="sensitive.htm" title="The following example shows the difference between sensitive and insensitive ResultSets when rows are inserted into a table.">Example: Sensitive and insensitive ResultSets</a></div>
|
||
|
|
<div><a href="connectionpoolingsetup.htm" title="This is an example of how to use connection pooling with UDBDataSource and UDBConnectionPoolDataSource.">Example: Set up connection pooling with UDBDataSource and UDBConnectionPoolDataSource</a></div>
|
||
|
|
<div><a href="exceptionexample.htm" title="This is an example of catching an SQLException and dumping all the information that it provides.">Example: SQLException</a></div>
|
||
|
|
<div><a href="jtatxsuspend.htm" title="This is an example of a transaction that is suspended and then is resumed.">Example: Suspend and resume a transaction</a></div>
|
||
|
|
<div><a href="jtatxeffect.htm" title="This is an example of the how a Statement object is reprocessed under another transaction to perform work.">Example: Suspended ResultSets</a></div>
|
||
|
|
<div><a href="connectionpoolingtest.htm" title="This is an example of how to test the performance of the pooling example against the performance of the non-pooling example.">Example: Test the performance of connection pooling</a></div>
|
||
|
|
<div><a href="statementpoolingtest.htm" title="This is an example of testing one DataSource that uses connection pooling only and the other DataSource that uses statement and connection pooling.">Example: Test the performance of two DataSources</a></div>
|
||
|
|
<div><a href="updateblobs.htm" title="This is an example of how to update BLOBs in your applications.">Example: Update BLOBs</a></div>
|
||
|
|
<div><a href="updateclobs.htm" title="This is an example of how to update CLOBs in your applications.">Example: Update CLOBs</a></div>
|
||
|
|
<div><a href="jtamultitx.htm" title="This is an example of how to use a single connection with multiple transactions.">Example: Use a connection with multiple transactions</a></div>
|
||
|
|
<div><a href="useblobs.htm" title="This is an example of how to use BLOBs in your applications.">Example: Use BLOBs</a></div>
|
||
|
|
<div><a href="useclobs.htm" title="This is an example of how to use CLOBs in your applications.">Example: Use CLOBs</a></div>
|
||
|
|
<div><a href="jtacommit.htm" title="This is an example of how to use the Java Transaction API (JTA) to handle a transaction in an application.">Example: Use JTA to handle a transaction</a></div>
|
||
|
|
<div><a href="safegetudts.htm" title="This is an example of how to use metadata ResultSets that have more than one column.">Example: Use metadata ResultSets that have more than one column</a></div>
|
||
|
|
<div><a href="getconnections.htm" title="This is an example of how to use the native JDBC connection and the IBM Toolbox for Java JDBC connection in a program.">Example: Use native JDBC and IBM Toolbox for Java JDBC concurrently</a></div>
|
||
|
|
<div><a href="prepex.htm" title="This is an example of using a PreparedStatement object's executeQuery method to obtain a ResultSet.">Example: Use PreparedStatement to obtain a ResultSet</a></div>
|
||
|
|
<div><a href="stateex.htm" title="This is an example of how to use the Statement object's executeUpdate method.">Example: Use the Statement object's executeUpdate method</a></div>
|
||
|
|
<div><a href="jaaswrld.htm" title="These examples show you the three files that are needed to compile and run HelloWorld for JAAS.">Examples: JAAS HelloWorld</a></div>
|
||
|
|
<div><a href="sampthrd.htm">Example: JAAS SampleThreadSubjectLogin</a></div>
|
||
|
|
<div><a href="rzahajgsssrcl.htm">Sample: IBM JGSS non-JAAS client program</a></div>
|
||
|
|
<div><a href="rzahajgsssrsr.htm">Sample: IBM JGSS non-JAAS server program</a></div>
|
||
|
|
<div><a href="rzahajgssjacl.htm">Sample: IBM JGSS JAAS-enabled client program</a></div>
|
||
|
|
<div><a href="rzahajgssjasr.htm">Sample: IBM JGSS JAAS-enabled server program</a></div>
|
||
|
|
<div><a href="rzahajsseexmpls.htm" title="The JSSE examples show how a client and a server can use the native iSeries JSSE provider to create a context that enables secure communications.">Examples: IBM Java Secure Sockets Extension</a></div>
|
||
|
|
<div><a href="callclex.htm" title="This example shows how to run CL programs from within a Java program. In this example, the Java class CallCLPgm runs a CL program.">Example: Call a CL program with java.lang.Runtime.exec()</a></div>
|
||
|
|
<div><a href="clcommex.htm" title="This example shows how to run a control language (CL) command from within a Java program.">Example: Call a CL command with java.lang.Runtime.exec()</a></div>
|
||
|
|
<div><a href="jvlngex1.htm" title="This example shows how to call another Java program with java.lang.Runtime.exec(). This class calls the Hello program that is shipped as part of the IBM Developer Kit for Java. When the Hello class writes to System.out, this program gets a handle to the stream and can read from it.">Example: Call another Java program with java.lang.Runtime.exec()</a></div>
|
||
|
|
<div><a href="callcex.htm" title="This is an example of a C program that uses the system() function to call the Java Hello program.">Example: Call Java from C</a></div>
|
||
|
|
<div><a href="calrpgex.htm" title="This is an example of an RPG program that uses the QCMDEXC API to call the Java Hello program.">Example: Call Java from RPG</a></div>
|
||
|
|
<div><a href="iostrmex.htm" title="This example shows how to call a C program from Java and use input and output streams for interprocess communication.">Example: Use input and output streams for interprocess communication</a></div>
|
||
|
|
<div><a href="invapiex.htm" title="This example follows the standard Invocation API paradigm.">Example: Java Invocation API</a></div>
|
||
|
|
<div><a href="jniex.htm" title="This example program is a simple Java Native Interface (JNI) example in which a C native method is used to display "Hello, World." Use the javah tool with the NativeHello class file to generate the NativeHello.h file. This example assumes that the NativeHello C implementation is part of a service program that is called NATHELLO.">Examples: Use the Java Native Interface for native methods</a></div>
|
||
|
|
<div><a href="socketex.htm" title="This example uses sockets to communicate between a Java program and a C program.">Example: Use sockets for interprocess communication</a></div>
|
||
|
|
<div><a href="sslcex01.htm" title="These examples show you how to change a simple socket class, named simpleSocketClient, so that it uses socket factories to create all of the sockets. The first example shows you the simpleSocketClient class without socket factories. The second example shows you the simpleSocketClient class with socket factories. In the second example, simpleSocketClient is renamed to factorySocketClient.">Examples: Change your Java code to use client socket factories</a></div>
|
||
|
|
<div><a href="sslcex03.htm" title="These examples show you how to change a simple socket class, named simpleSocketServer, so that it uses socket factories to create all of the sockets. The first example shows you the simpleSocketServer class without socket factories. The second example shows you the simpleSocketServer class with socket factories. In the second example, simpleSocketServer is renamed to factorySocketServer.">Examples: Change your Java code to use server socket factories</a></div>
|
||
|
|
<div><a href="sslcex02.htm" title="These examples show you how to change one class, named factorySocketClient, to use secure sockets layer (SSL). The first example shows you the factorySocketClient class not using SSL. The second example shows you the same class, renamed factorySSLSocketClient, using SSL.">Examples: Change your Java client to use secure sockets layer</a></div>
|
||
|
|
<div><a href="sslcex04.htm" title="These examples show you how to change one class, named factorySocketServer, to use secure sockets layer (SSL).">Examples: Change your Java server to use secure sockets layer</a></div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</body>
|
||
|
|
</html>
|