433 lines
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HTML
433 lines
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<title>Example: JDBC</title>
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<body id="basicjdbc"><a name="basicjdbc"><!-- --></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">Example: JDBC</h1>
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<div><p> This is an example of how to use the BasicJDBC program.</p>
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<div class="section"><div class="note"><span class="notetitle">Note:</span> By using the code examples, you agree to the terms of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
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<pre>//////////////////////////////////////////////////////////////////////////////////
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//
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// BasicJDBC example. This program uses the native JDBC driver for the
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// Developer Kit for Java to build a simple table and process a query
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// that displays the data in that table.
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//
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// Command syntax:
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// BasicJDBC
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//
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//////////////////////////////////////////////////////////////////////////////////
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//
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// This source is an example of the IBM Developer for Java JDBC driver.
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// IBM grants you a nonexclusive license to use this as an example
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// from which you can generate similar function tailored to
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// your own specific needs.
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//
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// This sample code is provided by IBM for illustrative purposes
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// only. These examples have not been thoroughly tested under all
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// conditions. IBM, therefore, cannot guarantee or imply
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// reliability, serviceability, or function of these programs.
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//
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// All programs contained herein are provided to you "AS IS"
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// without any warranties of any kind. The implied warranties of
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// merchantability and fitness for a particular purpose are
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// expressly disclaimed.
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//
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// IBM Developer Kit for Java
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// (C) Copyright IBM Corp. 2001
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// All rights reserved.
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// US Government Users Restricted Rights -
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// Use, duplication, or disclosure restricted
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// by GSA ADP Schedule Contract with IBM Corp.
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//
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//////////////////////////////////////////////////////////////////////////////////
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// Include any Java classes that are to be used. In this application,
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// many classes from the java.sql package are used and the
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// java.util.Properties class is also used as part of obtaining
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// a connection to the database.
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import java.sql.*;
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import java.util.Properties;
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// Create a public class to encapsulate the program.
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public class BasicJDBC {
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// The connection is a private variable of the object.
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private Connection connection = null;
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// Any class that is to be an 'entry point' for running
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// a program must have a main method. The main method
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// is where processing begins when the program is called.
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public static void main(java.lang.String[] args) {
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// Create an object of type BasicJDBC. This
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// is fundamental to object-oriented programming. Once
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// an object is created, call various methods on
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// that object to accomplish work.
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// In this case, calling the constructor for the object
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// creates a database connection that the other
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// methods use to do work against the database.
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BasicJDBC test = new BasicJDBC();
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// Call the rebuildTable method. This method ensures that
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// the table used in this program exists and looks
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// correct. The return value is a boolean for
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// whether or not rebuilding the table completed
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// successfully. If it did no, display a message
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// and exit the program.
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if (!test.rebuildTable()) {
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System.out.println("Failure occurred while setting up " +
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" for running the test.");
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System.out.println("Test will not continue.");
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System.exit(0);
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}
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// The run query method is called next. This method
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// processes an SQL select statement against the table that
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// was created in the rebuildTable method. The output of
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// that query is output to standard out for you to view.
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test.runQuery();
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// Finally, the cleanup method is called. This method
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// ensures that the database connection that the object has
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// been hanging on to is closed.
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test.cleanup();
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}
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/**
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This is the constructor for the basic JDBC test. It creates a database
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connection that is stored in an instance variable to be used in later
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method calls.
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**/
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public BasicJDBC() {
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// One way to create a database connection is to pass a URL
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// and a java Properties object to the DriverManager. The following
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// code constructs a Properties object that has your user ID and
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// password. These pieces of information are used for connecting
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// to the database.
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Properties properties = new Properties ();
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properties.put("user", "cujo");
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properties.put("user", "newtiger");
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// Use a try/catch block to catch all exceptions that can come out of the
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// following code.
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try {
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// The DriverManager must be aware that there is a JDBC driver available
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// to handle a user connection request. The following line causes the
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// native JDBC driver to be loaded and registered with the DriverManager.
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Class.forName("com.ibm.db2.jdbc.app.DB2Driver");
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// Create the database Connection object that this program uses in all
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// the other method calls that are made. The following code specifies
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// that a connection is to be established to the local database and that
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// that connection should conform to the properties that were set up
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// previously (that is, it should use the user ID and password specified).
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connection = DriverManager.getConnection("jdbc:db2:*local", properties);
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} catch (Exception e) {
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// If any of the lines in the try/catch block fail, control transfers to
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// the following line of code. A robust application tries to handle the
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// problem or provide more details to you. In this program, the error
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// message from the exception is displayed and the application allows
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// the program to return.
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System.out.println("Caught exception: " + e.getMessage());
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}
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}
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/**
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Ensures that the qgpl.basicjdbc table looks you want it to at the start of
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the test.
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@returns boolean Returns true if the table was rebuild successfully;
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returns false if any failure occurred.
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**/
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public boolean rebuildTable() {
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// Wrap all the functionality in a try/catch block so an attempt is
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// made to handle any errors that may happen within this method.
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try {
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// Statement objects are used to process SQL statements against the
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// database. The Connection object is used to create a Statement
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// object.
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Statement s = connection.createStatement();
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try {
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// Build the test table from scratch. Process an update statement
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// that attempts to delete the table if it currently exists.
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s.executeUpdate("drop table qgpl.basicjdbc");
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} catch (SQLException e) {
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// Do not perform anything if an exception occurred. Assume
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// that the problem is that the table that was dropped does not
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// exist and that it can be created next.
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}
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// Use the statement object to create our table.
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s.executeUpdate("create table qgpl.basicjdbc(id int, name char(15))");
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// Use the statement object to populate our table with some data.
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s.executeUpdate("insert into qgpl.basicjdbc values(1, 'Frank Johnson')");
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s.executeUpdate("insert into qgpl.basicjdbc values(2, 'Neil Schwartz')");
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s.executeUpdate("insert into qgpl.basicjdbc values(3, 'Ben Rodman')");
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s.executeUpdate("insert into qgpl.basicjdbc values(4, 'Dan Gloore')");
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// Close the SQL statement to tell the database that it is no longer
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// needed.
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s.close();
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// If the entire method processed successfully, return true. At this point,
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// the table has been created or refreshed correctly.
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return true;
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} catch (SQLException sqle) {
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// If any of our SQL statements failed (other than the drop of the table
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// that was handled in the inner try/catch block), the error message is
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// displayed and false is returned to the caller, indicating that the table
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// may not be complete.
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System.out.println("Error in rebuildTable: " + sqle.getMessage());
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return false;
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}
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}
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/**
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Runs a query against the demonstration table and the results are displayed to
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standard out.
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**/
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public void runQuery() {
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// Wrap all the functionality in a try/catch block so an attempts is
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// made to handle any errors that might happen within this
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// method.
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try {
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// Create a Statement object.
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Statement s = connection.createStatement();
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// Use the statement object to run an SQL query. Queries return
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// ResultSet objects that are used to look at the data the query
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// provides.
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ResultSet rs = s.executeQuery("select * from qgpl.basicjdbc");
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// Display the top of our 'table' and initialize the counter for the
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// number of rows returned.
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System.out.println("--------------------");
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int i = 0;
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// The ResultSet next method is used to process the rows of a
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// ResultSet. The next method must be called once before the
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// first data is available for viewing. As long as next returns
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// true, there is another row of data that can be used.
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while (rs.next()) {
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// Obtain both columns in the table for each row and write a row to
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// our on-screen table with the data. Then, increment the count
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// of rows that have been processed.
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System.out.println("| " + rs.getInt(1) + " | " + rs.getString(2) + "|");
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i++;
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}
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// Place a border at the bottom on the table and display the number of rows
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// as output.
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System.out.println("--------------------");
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System.out.println("There were " + i + " rows returned.");
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System.out.println("Output is complete.");
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} catch (SQLException e) {
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// Display more information about any SQL exceptions that are
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// generated as output.
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System.out.println("SQLException exception: ");
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System.out.println("Message:....." + e.getMessage());
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System.out.println("SQLState:...." + e.getSQLState());
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System.out.println("Vendor Code:." + e.getErrorCode());
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e.printStackTrace();
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}
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}
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/**
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The following method ensures that any JDBC resources that are still
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allocated are freed.
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**/
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public void cleanup() {
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try {
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if (connection != null)
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connection.close();
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} catch (Exception e) {
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System.out.println("Caught exception: ");
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e.printStackTrace();
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}
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}
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}</pre>
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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="jdbctutr.htm" title="The following is a tutorial on writing a Java Database Connectivity (JDBC) program and having it run on the an iSeries server with the native JDBC driver. It is designed to show you the basic steps required for your program to run JDBC.">JDBC tutorial</a></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="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>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<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>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<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>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<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>
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<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>
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<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>
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<div><a href="accesspropertytest.htm" title="This is an example of how to use the Access property.">Example: Access property</a></div>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<div><a href="putgetdatalinks.htm" title="This is an example of how to use datalinks in your applications.">Example: Datalink</a></div>
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<div><a href="distinct.htm" title="This is an example of how to use distinct types.">Example: Distinct types</a></div>
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<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>
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<div><a href="jtatxend.htm" title="This is an example of ending a transaction in your application.">Example: End a transaction</a></div>
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<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>
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<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>
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<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>
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<div><a href="pmd.htm" title="This is an example of using the ParameterMetaData interface to retrieve information about parameters.">Example: ParameterMetaData</a></div>
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<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>
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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><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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<div><a href="updateblobs.htm" title="This is an example of how to update BLOBs in your applications.">Example: Update BLOBs</a></div>
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<div><a href="updateclobs.htm" title="This is an example of how to update CLOBs in your applications.">Example: Update CLOBs</a></div>
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<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>
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<div><a href="useblobs.htm" title="This is an example of how to use BLOBs in your applications.">Example: Use BLOBs</a></div>
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<div><a href="useclobs.htm" title="This is an example of how to use CLOBs in your applications.">Example: Use CLOBs</a></div>
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<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>
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<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>
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<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>
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<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>
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<div><a href="crdb2cac.htm" title="There are several ways to place data into a DB2CachedRowSet.">Create and populate a DB2CachedRowSet</a></div>
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<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>
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<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>
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<div><a href="sampthrd.htm">Example: JAAS SampleThreadSubjectLogin</a></div>
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<div><a href="rzahajgsssrcl.htm">Sample: IBM JGSS non-JAAS client program</a></div>
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<div><a href="rzahajgsssrsr.htm">Sample: IBM JGSS non-JAAS server program</a></div>
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<div><a href="rzahajgssjacl.htm">Sample: IBM JGSS JAAS-enabled client program</a></div>
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<div><a href="rzahajgssjasr.htm">Sample: IBM JGSS JAAS-enabled server program</a></div>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<div><a href="invapiex.htm" title="This example follows the standard Invocation API paradigm.">Example: Java Invocation API</a></div>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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</div>
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</div>
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</body>
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