第6章 例

public class JDBCTest
{
    public static void main (String[] args)
    {
	/*
	 */
      
	Connection conn = null;
	Connection conn2 = null;
	Statement stmt = null;        // non-tx statement
	Statement stmtx = null;	// will be a tx-statement
	Properties dbProperties = new Properties();
      
	try
	    {
		System.out.println("\nCreating connection to database: "+url);
      
		/*
		 * Create conn and conn2 so that they are bound to the JBossTS
		 * transactional JDBC driver. The details of how to do this will
		 * depend on your environment, the database you wish to use and
		 * whether or not you want to use the Direct or JNDI approach. See
		 * the appropriate chapter in the JTA Programmers Guide.
		 */
      
		stmt = conn.createStatement();  // non-tx statement
      
		try
		    {
			stmt.executeUpdate("DROP TABLE test_table");
			stmt.executeUpdate("DROP TABLE test_table2");
		    }
		catch (Exception e)
		    {
			// assume not in database.
		    }
      
		try
		    {
			stmt.executeUpdate("CREATE TABLE test_table (a INTEGER,b INTEGER)");
			stmt.executeUpdate("CREATE TABLE test_table2 (a INTEGER,b INTEGER)");
		    }
		catch (Exception e)
		    {
		    }
      
		try
		    {
			System.out.println("Starting top-level transaction.");
      
			com.arjuna.ats.jta.UserTransaction.userTransaction().begin();
      
			stmtx = conn.createStatement(); // will be a tx-statement
      
			System.out.println("\nAdding entries to table 1.");
      
			stmtx.executeUpdate("INSERT INTO test_table (a, b) VALUES (1,2)");
      
			ResultSet res1 = null;
      
			System.out.println("\nInspecting table 1.");
      
			res1 = stmtx.executeQuery("SELECT * FROM test_table");
			while (res1.next())
			    {
				System.out.println("Column 1: "+res1.getInt(1));
				System.out.println("Column 2: "+res1.getInt(2));
			    }
      
			System.out.println("\nAdding entries to table 2.");
      
			stmtx.executeUpdate("INSERT INTO test_table2 (a, b) VALUES (3,4)");
      
			res1 = stmtx.executeQuery("SELECT * FROM test_table2");
      
			System.out.println("\nInspecting table 2.");
      
			while (res1.next())
			    {
				System.out.println("Column 1: "+res1.getInt(1));
				System.out.println("Column 2: "+res1.getInt(2));
			    }
			System.out.print("\nNow attempting to rollback changes.");
      
			com.arjuna.ats.jta.UserTransaction.userTransaction().rollback();
      
			com.arjuna.ats.jta.UserTransaction.userTransaction().begin();
      
			stmtx = conn.createStatement();
			ResultSet res2 = null;
      
			System.out.println("\nNow checking state of table 1.");
      
			res2 = stmtx.executeQuery("SELECT * FROM test_table");
			while (res2.next())
			    {
				System.out.println("Column 1: "+res2.getInt(1));
				System.out.println("Column 2: "+res2.getInt(2));
			    }
      
			System.out.println("\nNow checking state of table 2.");
      
			stmtx = conn.createStatement();
			res2 = stmtx.executeQuery("SELECT * FROM test_table2");
			while (res2.next())
			    {
				System.out.println("Column 1: "+res2.getInt(1));
				System.out.println("Column 2: "+res2.getInt(2));
			    }
      
			com.arjuna.ats.jta.UserTransaction.userTransaction().commit(true);
		    }
		catch (Exception ex)
		    {
			ex.printStackTrace();
			System.exit(0);
		    }
	    }
	catch (Exception sysEx)
	    {
		sysEx.printStackTrace();
		System.exit(0);
	    }
    }