79 lines
4.0 KiB
HTML
79 lines
4.0 KiB
HTML
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<meta name="DC.Title" content="PreparedStatement interface" />
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<title>PreparedStatement interface</title>
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</head>
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<body id="jdbcpst"><a name="jdbcpst"><!-- --></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">PreparedStatement interface</h1>
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<div><p></p>
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<div class="section"><p>You can use a <a href="javadoc/com/ibm/as400/access/AS400JDBCPreparedStatement.html#NAVBAR_TOP"> PreparedStatement</a> object when an SQL statement
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is going to be run many times. An SQL statement can be precompiled. A "prepared."
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statement is an SQL statement that has been precompiled. This approach is
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more efficient than running the same statement multiple times using a Statement
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object, which compiles the statement each time it is run. In addition, the
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SQL statement contained in a PreparedStatement object may have one or more
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IN parameters. Use Connection.prepareStatement() to create PreparedStatement
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objects.</p>
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<p>The PreparedStatement object allows you to submit multiple
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SQL commands as a single group to a database through the use of batch support.
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You may improve performance by using batch support because processing a group
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of operations is typically faster than processing them one at a time. For
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more information about using batch support, see <a href="rzahhjdbcenhancev5r2.htm#rzahhjdbcenhancev5r2__as400jdbcstatementmethods">Enhancements
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to JDBC support</a>.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Example: Using PreparedStatement</h4><p>The following example
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shows how to use the PreparedStatement interface.</p>
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<pre> // Connect to the server.
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Connection c = DriverManager.getConnection("jdbc:as400://mySystem");
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// Create the PreparedStatement
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// object. It precompiles the
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// specified SQL statement. The
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// question marks indicate where
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// parameters must be set before the
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// statement is run.
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PreparedStatement ps = c.prepareStatement("INSERT INTO MYLIBRARY.MYTABLE (NAME, ID) VALUES (?, ?)");
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// Set parameters and run the
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// statement.
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ps.setString(1, "JOSH");
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ps.setInt(2, 789);
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ps.executeUpdate();
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// Set parameters and run the
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// statement again.
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ps.setString(1, "DAVE");
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ps.setInt(2, 456);
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ps.executeUpdate();
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// Close PreparedStatement and the
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// Connection.
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ps.close();
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c.close();</pre>
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</div>
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