JDBC使用事务实例

 package qddx.JDBC;
 import java.sql.*;
 public class useTransaction {
 
     public static void main(String[] args) {
         // TODO Auto-generated method stub
         Connection conn = null;
         Statement st = null;
         PreparedStatement pst = null;
         ResultSet rs = null;
         Savepoint sp = null;
         try{
         conn = JDBC_Connection.getConnection();
         //指定事务隔离级别
         conn.setTransactionIsolation(conn.TRANSACTION_READ_UNCOMMITTED);
         pst = conn.prepareStatement("create table users (id smallint,username text)");
         pst.execute();
         //提交事务
         conn.commit();
         pst.close();
         }catch(SQLException e){
             System.err.println("连接数据库或者建表失败");
             System.err.println("事务回滚到回滚点");
             try{
             conn.rollback();
             }catch(SQLException ex){
                 //ex.printStackTrace();
                 System.out.println("回滚失败");
             }
             try{
             conn.setSavepoint();//设置一个存储点
             st = conn.createStatement();
             st.executeUpdate("insert into users values(110,'Janes')");//执行更新语句
             //st.executeUpdate("insert into users values('shibai','Janes')");//执行更新语句 失败的例子
             conn.commit();//提交事务
             conn.releaseSavepoint(sp);//释放存储点
             st.close();
             conn.close();
 
             }catch(SQLException et){
                 System.err.println("操作失败");
                 System.err.println("事务回滚到存储点");
                 try{
                 conn.rollback(sp);
                 st.close();
                 conn.close();
                 }catch(SQLException exc){
                     System.out.println("回滚到存储点失败");
                     //exc.printStackTrace();;
                 }
                 //et.printStackTrace();
             }
             //e.printStackTrace();
         }
 
     }
 
 }