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();
}
