MyBatis批量新增数据

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","[e-mail]","F"),("lisi","[e-mail]","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","[e-mail]","F");
                insert into person(username,email,gender) VALUES("jerry","[e-mail]","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();


    }