MyBatis批量添加数据2种实现方法
1.通过for each标签拼接sql(数量较少的时候使用)
a.拼接values()
public int addPersons(@Param("persons") List<Person> persons);//接口
<insert id="addPersons"> insert into person(username,email,gender) VALUES <foreach collection="persons" item="person" separator=";"> (#{person.username},#{person.email},#{person.gender}) </foreach> </insert> <!--类似的效果 insert into person(username,email,gender) VALUES("zhangsan","zhangsan@163.com","F"),("lisi","lisi@163.com","F"),... -->
b.拼接insert sql语句(需设置属性allowMultiQueries=true)
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?allowMultiQueries=true //需设置属性
jdbc.username=root
jdbc.password=123
public int addPersons(@Param("persons") List<Person> persons);//接口
<insert id="addPersons"> insert into person(username,email,gender) VALUES <foreach collection="persons" item="person" separator=","> (#{person.username},#{person.email},#{person.gender}) </foreach> </insert> <!--类似的效果 insert into person(username,email,gender) VALUES("tom","zhangsan@163.com","F"); insert into person(username,email,gender) VALUES("jerry","lisi@163.com","F");...-->
2.基于Session的ExecutorType进行批量添加
先定义一条插入一条记录的方法
public int addPerson(User user); //接口
<insert id="addPerson" parameterType="user"> insert into t_user(username,address) VALUES (#{username},#{address}) </insert>
在java代码中使用
public void testBatchForExecutor() { SqlSession sqlSession = this.getSqlSessionFactory().openSession(ExecutorType.BATCH); //通过session设置ExecutorType开启批量添加,类似jdbc的addBatch操作 PersonMapper personMapper = sqlSession.getMapper(PersonMapper.class); for (int i = 0; i <10000 ; i++) { personMapper.addPerson(new User("jerry","bj")); } sqlSession.commit(); sqlSession.close(); }
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