MyBatis批量新增數據

1.通過for each標簽拼接sql（數量較少的時候使用）

　　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>

<!--類似的效果 insert into person(username,email,gender) VALUES("zhangsan","[e-mail]","F"),("lisi","[e-mail]","F"),... -->

　　b.拼接insert sql語句（需設置屬性allowMultiQueries=true）

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?allowMultiQueries=true   //需設置屬性
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>
<!--類似的效果  insert into person(username,email,gender) VALUES("tom","[e-mail]","F");
                insert into person(username,email,gender) VALUES("jerry","[e-mail]","F");...-->

2.基於Session的ExecutorType進行批量添加

先定義一條插入一條記錄的方法

public int addPerson(User user);   //接口

  <insert id="addPerson" parameterType="user">
    insert into t_user(username,address) VALUES (#{username},#{address})
  </insert>

在java代碼中使用

    public void testBatchForExecutor()
    {
        SqlSession sqlSession = this.getSqlSessionFactory().openSession(ExecutorType.BATCH);  //通過session設置ExecutorType開啟批量添加，類似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();


    }