时间:2021-07-01 10:21:17 帮助过:12人阅读
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
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();
}
}
}