在Java编程中，如何同时在数据库上执行多个SQL命令？假定数据库名称是：testdb，其中有两张表:employee和dept，employee表中有4条记录,dept表中有2条记录。

创建数据库表的语句 -

use testdb;

-- 员工表

drop table if exists employees;

create table if not exists employees (

id int not null primary key,

age int not null,

name varchar(64),

dept_id int(10)

);

INSERT INTO employees VALUES (100, 28, 'MaxSu', 1);

INSERT INTO employees VALUES (101, 25, 'WeiWang', 2);

INSERT INTO employees VALUES (102, 30, 'KidaSu', 2);

INSERT INTO employees VALUES (103, 28, 'KobeBryant', 1);

----

-- 部门表

drop table if exists dept;

create table if not exists dept (

id int not null primary key,

name varchar (64)

);

INSERT INTO dept VALUES (1, '技术部');

INSERT INTO dept VALUES (2, '市场部');

以下示例中演示如何使用addBatch()和executeBatch()方法同时执行多个SQL命令。

package com.yiibai;

import java.sql.*;

public class ExecuteMultipleSQLStatements {

public static void main(String[] args) throws Exception {

String JDBC_DRIVER = "com.mysql.jdbc.Driver";

String DB_URL = "jdbc:mysql://localhost/testdb?useSSL=false";

String User = "root";

String Passwd = "123456";

try {

Class.forName(JDBC_DRIVER);

} catch (ClassNotFoundException e) {

System.out.println("Class not found " + e);

}

Connection con = DriverManager.getConnection(DB_URL, User, Passwd);

Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);

String insertEmp1 = "insert into employees(id,name,age,dept_id) values(110,'Jay',19, 1)";

String insertEmp2 = "insert into employees(id,name,age,dept_id) values(111,'Weiwei',22,2)";

String insertEmp3 = "insert into employees(id,name,age,dept_id) values(112,'Hkou',25,3)";

con.setAutoCommit(false);

stmt.addBatch(insertEmp1);

stmt.addBatch(insertEmp2);

stmt.addBatch(insertEmp3);

ResultSet rs = stmt.executeQuery("select * from employees");

rs.last();

System.out.println("rows before batch execution= " + rs.getRow());

stmt.executeBatch();

con.commit();

System.out.println("Batch executed");

rs = stmt.executeQuery("select * from employees");

rs.last();

System.out.println("rows after batch execution = " + rs.getRow());

}

}

上述代码示例将产生以下结果。

rows before batch execution= 4

Batch executed

rows after batch execution = 7

注：如果JDBC驱动程序安装不正确，将获得ClassNotfound异常。

Class not found java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

JDBC Class found

SQL exception occuredjava.sql.SQLException: No suitable driver found for jdbc:mysql://localhost/testdb

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