Statement及PreparedStatement执行多个sql

    这两个对象的区别：

1.Statement它更适合执行不同sql的批处理，它没有提供预处理功能，性能比较低。

2.PreparedStatement它适合执行相同的批处理，它提供了预处理功能，属性比较高。 

          /**

      * @param args

      * @throws SQLException

      * @throws ClassNotFoundException

      */

     public static void main(String[] args) throws ClassNotFoundException,

                SQLException {

            // 定义sql 语句

           String sql1 = "create table person(id int,name varchar(20))";

           String sql2 = "insert into person values(1,'tom')";

           String sql3 = "insert into person values(2,'fox')";

           String sql4 = "insert into person values(3,'tony')";

           String sql5 = "update person set name='张三' where id=1";

           String sql6 = "delete from person where id=3";

 

           Connection conn = jdbcUtils.getConnection();

           Statement st = conn.createStatement();

 

            // 添加批处理sql

           st.addBatch(sql1);

           st.addBatch(sql2);

           st.addBatch(sql3);

           st.addBatch(sql4);

           st.addBatch(sql5);

           st.addBatch(sql6);

 

            // 执行批处理sql

           st.executeBatch();

           st.clearBatch();

           st.close();

            conn.close();

 

     }

 

 

使用版本高一点的 jdbc的jar包时加入参数可开启缓存在url中加参数：

?useServerPrepStmts=true&cachePrepStmts=true&rewriteBatchedStatements=true

     /**

      * @param args

      * @throws SQLException

      * @throws ClassNotFoundException

      */

     public static void main(String[] args) throws ClassNotFoundException,

                SQLException {

           String sqlString = "insert into person values(?,?)";

           Connection conn = jdbcUtils. getConnection();

           PreparedStatement pst = conn.prepareStatement(sqlString);

            long l = System. currentTimeMillis();

            for ( int i = 0; i < 10000; i++) {

                pst.setInt(1, i);

                pst.setString(2, "name" + i);

                pst.addBatch();

                 if (i % 1000 == 0) {

                     pst.executeBatch();

                     pst.clearBatch(); // 清空缓存

                }

           }

           pst.executeBatch();

           pst.close();

           conn.close();

           System. out.println(System. currentTimeMillis() - l);

     }