107 lines
6.8 KiB
HTML
107 lines
6.8 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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<meta name="DC.Title" content="Running SQL statements with Statement objects" />
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<meta name="abstract" content="" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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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>Running SQL statements with Statement objects</title>
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</head>
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<body id="jdbcst"><a name="jdbcst"><!-- --></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">Running SQL statements with Statement objects</h1>
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<div><p></p>
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<div class="section"><p>Use a <a href="javadoc/com/ibm/as400/access/AS400JDBCStatement.html#NAVBAR_TOP">Statement</a> object to run an SQL statement
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and optionally obtain the ResultSet produced by it.</p>
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<p>PreparedStatement
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inherits from Statement, and CallableStatement inherits from PreparedStatement.
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Use the following Statement objects to run different SQL statements:</p>
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<ul><li> <a href="#jdbcst__jdbcststatement">Statement interface</a>: Runs a simple SQL statement
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that has no parameters.</li>
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<li><a href="jdbcpst.htm#jdbcpst">PreparedStatement interface</a> - Runs a precompiled SQL statement
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that may or may not have IN parameters.</li>
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<li><a href="jdbccst.htm#jdbccst">CallableStatement interface</a> - Runs a call to a database
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stored procedure. A CallableStatement may or may not have IN, OUT, and INOUT
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parameters.</li>
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</ul>
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<p>The Statement object allows you to submit multiple SQL commands as
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a single group to a database through the use of batch support. You may improve
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performance by using batch support because processing a group of operations
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is typically faster than processing them one at a time. For more information
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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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<p>When using batch updates, typically you turn
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off auto-commit. Turning off auto-commit allows your program to determine
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whether to commit the transaction if an error occurs and not all of the commands
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have executed. In JDBC 2.0 and later JDBC specifications, a Statement object
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can keep track of a list of commands that can be successfully submitted and
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executed together in a group. When this list of batch commands is executed
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by the executeBatch() method, the commands are executed in the order in which
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they were added to the list.</p>
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<p>AS400JDBCStatement provides methods that
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enable you to perform many actions, including the following:</p>
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<ul><li><a href="javadoc/com/ibm/as400/access/AS400JDBCStatement.html#EXECUTE(JAVA.LANG.STRING)">Execute different kinds of statements</a></li>
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<li>Retrieve the values for different parameters of the Statement object,
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including: <ul><li><a href="javadoc/com/ibm/as400/access/AS400JDBCStatement.html#GETCONNECTION()">The connection</a></li>
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<li>Any <a href="javadoc/com/ibm/as400/access/AS400JDBCStatement.html#GETGENERATEDKEYS()">auto-generated keys</a> created as a result
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of executing the Statement</li>
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<li>The <a href="javadoc/com/ibm/as400/access/AS400JDBCStatement.html#GETFETCHSIZE()">fetch size</a> and <a href="javadoc/com/ibm/as400/access/AS400JDBCStatement.html#GETFETCHDIRECTION()">fetch direction</a></li>
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<li>The <a href="javadoc/com/ibm/as400/access/AS400JDBCStatement.html#GETMAXFIELDSIZE()">maximum field size</a> and <a href="javadoc/com/ibm/as400/access/AS400JDBCStatement.html#GETMAXROWS()">maximum row limit</a></li>
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<li>The <a href="javadoc/com/ibm/as400/access/AS400JDBCStatement.html#GETRESULTSET()">current result set</a>, the <a href="javadoc/com/ibm/as400/access/AS400JDBCStatement.html#GETMORERESULTS(INT)">next result set</a>, the <a href="javadoc/com/ibm/as400/access/AS400JDBCStatement.html#GETRESULTSETTYPE()">type of result set</a>, the <a href="javadoc/com/ibm/as400/access/AS400JDBCStatement.html#GETRESULTSETCONCURRENCY()">result set concurrency</a>, and the <a href="javadoc/com/ibm/as400/access/AS400JDBCStatement.html#GETRESULTSETHOLDABILITY()">result set cursor holdability</a></li>
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</ul>
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</li>
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<li><a href="javadoc/com/ibm/as400/access/AS400JDBCStatement.html#ADDBATCH(JAVA.LANG.STRING)">Add an SQL statement</a> to the current batch</li>
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<li><a href="javadoc/com/ibm/as400/access/AS400JDBCStatement.html#EXECUTEBATCH()">Run the current batch</a> of SQL statements</li>
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</ul>
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</div>
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<div class="section" id="jdbcst__jdbcststatement"><a name="jdbcst__jdbcststatement"><!-- --></a><h4 class="sectiontitle">Statement interface</h4><p>Use Connection.createStatement()
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to create new Statement objects.</p>
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<p>The following example shows how to
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use a Statement object.</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 a Statement object.
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Statement s = c.createStatement();
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// Run an SQL statement that creates
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// a table in the database.
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s.executeUpdate("CREATE TABLE MYLIBRARY.MYTABLE (NAME VARCHAR(20), ID INTEGER)");
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// Run an SQL statement that inserts
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// a record into the table.
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s.executeUpdate("INSERT INTO MYLIBRARY.MYTABLE (NAME, ID) VALUES ('DAVE', 123)");
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// Run an SQL statement that inserts
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// a record into the table.
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s.executeUpdate("INSERT INTO MYLIBRARY.MYTABLE (NAME, ID) VALUES ('CINDY', 456)");
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// Run an SQL query on the table.
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ResultSet rs = s.executeQuery("SELECT * FROM MYLIBRARY.MYTABLE");
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// Close the Statement and the
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// Connection.
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s.close();
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c.close();</pre>
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</div>
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</div>
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</body>
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</html>
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