Java事务处理类

Mysql5很好的支持了事物处理功能。不过支持这个功能的只有两种表类型。

 

分别是BDB，InnoDB。

 

先建立一个表，名为Kiss，数据为id （int），name（varchar），pop（varchar）。\

 

下面是源码：

 

import java.sql.*;

public class TestCommit{
    public static void main(String args[]){
    Connection conn=null;
    try{
       Class.forName("com.mysql.jdbc.Driver");
       String url="jdbc:mysql://localhost:3306/kiss";
       conn=DriverManager.getConnection(url,"username","password");
       boolean autoCommit=conn.getAutoCommit();
       //关闭自动提交功能
       conn.setAutoCommit(false);
       Statement stmt=conn.createStatement();
       stmt.executeUpdate("insert into sun values(15,'Hello','Beijing')");
       stmt.executeUpdate("insert into sun values(16,'Hi','shanghai')");
       ResultSet rs=stmt.executeQuery("select * from sun");
       while(rs.next()){
            System.out.print("DeptNo:"+rs.getInt(1));
            System.out.print("\tDeptName:"+rs.getString(2));
            System.out.println("\tLOC:"+rs.getString(3));
}   
//提交事务
    conn.commit();
//恢复原来的提交模式
    conn.setAutoCommit(autoCommit);
    stmt.close();
}catch(Exception e){
    System.out.println("操作失败！！！任务撤销！！！");
    try{
        //回滚、取消前述操作
        conn.rollback();
    }catch(Exception e1){
      e1.printStackTrace();
    }
}finally{
   try{
         if(conn!=null){
            conn.close();
         }
   }catch(Exception e1){
     e1.printStackTrace();
    }
   }
    }
}

 

执行第一次执行这个类，id如果不冲突，就可以顺利插入数据，第二次插入，id冲突，则实现回滚。

 

下面是部分回滚：

import java.sql.*;

public class TestSavepoint{
    public static void main(String args[]){
    Connection conn=null;
    try{
       Class.forName("com.mysql.jdbc.Driver");
       String url="jdbc:mysql://localhost:3306/kiss";
       conn=DriverManager.getConnection(url,"username","password");
       boolean autoCommit=conn.getAutoCommit();
       //关闭自动提交功能
       conn.setAutoCommit(false);
       Statement stmt=conn.createStatement();
       stmt.executeUpdate("insert into sun values(21,'Hello','Beijing')");
       stmt.executeUpdate("insert into sun values(22,'Hi','shanghai')");
       Savepoint sp1=conn.setSavepoint("p1");
       stmt.executeUpdate("insert into sun values(25,'shiyang','xingtai')");
       Savepoint sp2=conn.setSavepoint("p2");
       stmt.executeUpdate("insert into sun values(60,'shiyang','baoding')");
       ResultSet rs=stmt.executeQuery("select avg(id) from sun");
       rs.next();
       double avg_id=rs.getDouble(1);
       if(avg_id>100){
         conn.rollback(sp1);
       }else if(avg_id>30){
         conn.rollback(sp2);
       }
       conn.commit();
       rs=stmt.executeQuery("select * from sun");
       while(rs.next()){
            System.out.print(rs.getInt(1));
            System.out.print("\t"+rs.getString(2).trim());
            System.out.println("\t"+rs.getString(3));
}   
rs.close();
stmt.close();
    }catch(Exception e){
      System.out.println("Failure.rollback!!!");
   try{
       conn.rollback();
   }catch(Exception e1){
     e1.printStackTrace();
    }
    e.printStackTrace();
   }finally{
     try{
       if(conn!=null){
         conn.close();
       }
     }catch(Exception e1){
       e1.printStackTrace();
     }
   }
    }
}

 

 

评论

1 楼 flowerjacky 2012-05-19  

明了