JTA，即Java Transaction API，提供了事务划分的标准结构。JTA事务由Java EE事务管理器控制，它可以保证多个数据库更新的一致性吗，通过JTA即可实现全局事务控制

实例演示：

package com.jta;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
import javax.transaction.NotSupportedException;
import javax.transaction.SystemException;
import javax.transaction.UserTransaction;
public class JTATest
{
      public static void main(String[] args) throws SQLException
      {
            System.out.println("begin test");
            Hashtable cs = new Hashtable();
            cs.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
            cs.put(Context.PROVIDER_URL, "t3://localhost:7001");
            //UserTransaction userTransaction = null;
            DataSource ds1 = null;
            DataSource ds2 = null;
            Context ctx = null;
            try
            {
                  ctx = new InitialContext(cs);
                  //userTransaction = (UserTransaction)ctx.lookup("javax.transaction.UserTransaction");
                  //userTransaction.begin();
                  ds1 = (DataSource)ctx.lookup("MySqlDs");
                  ds2 = (DataSource)ctx.lookup("Mysqlds2");
            }
            catch (Exception E)
            {
                  System.out.println("Init Error: " + E);
            }
            Connection conn1 = null;
            Connection conn2 = null;
            Statement stmt1 = null;
            Statement stmt2 = null;
            try
            {
                  conn1 = ds1.getConnection();
                  conn2 = ds1.getConnection();
                  stmt1 = conn1.createStatement();
                  stmt2 = conn2.createStatement();
                  String sql1 = "insert into temp(id,name) values(11,'sql1');";
                  String sql2 = "insert into temp(id,name) values(12,'sql2');";
                  int sun1 = stmt1.executeUpdate(sql1);
                  int sun2 = stmt2.executeUpdate(sql2);
                  String sql11 = "insert into temp(id,name) values(13,'sql11');";
                  String sql21 = "insert into temp(id,name) values(13,'sql21');";
                  int sun11 = stmt1.executeUpdate(sql11);
                  int sun21 = stmt2.executeUpdate(sql21);
                  //userTransaction.commit();
                  System.out.println("Success!");
            }
            catch (Exception e)
            {
                  // try
                  // {
                        // if (null != userTransaction)
                        // {
                              // userTransaction.rollback();
                        // }
                  // }
                  // catch (Exception e1)
                  // {
                        // e1.printStackTrace();
                  // }
                  e.printStackTrace();
            }
            finally
            {
                  if (stmt1 != null)
                  {
                        stmt1.close();
                  }
                  if (stmt2 != null)
                  {
                        stmt2.close();
                  }
                  if (conn1 != null)
                  {
                        conn1.close();
                  }
                  if (conn2 != null)
                  {
                        conn2.close();
                  }
            }
      }
}

在Weblogic 上创建 多个数据源，可知，当插入数据冲突时，之前不冲突的数据照样被插入数据库中了

使用JTA ，即代码中去掉注释重新执行，可知，当插入数据冲突时，之前不冲突的数据也不会被插入数据库中