mybatis中的多条件查询

Posted 2020-10-08 努力奋斗吧

使用Map集合和索引号

 

接口：

/**
 * 多条件查询Map集合
 * @param map
 * @return
 */
public List<Student> findByManyCondition(Map<String,Object> map);

/**
 * 多参数查询使用索引
 * @param name
 * @param age
 * @return
 */
public List<Student> findStudentByCondition(String name,int age);


xml文件（小配置）

<!--多条件查询Map集合-->
<select id="findByManyCondition" resultType="student">
   SELECT  *from Student WHERE  name LIKE ‘%‘ #{name } ‘%‘ AND age>#{age}
</select>

<!--多参数查询使用索引-->
<select id="findStudentByCondition" resultType="student">
    SELECT  *from Student WHERE  name LIKE ‘%‘ #{0} ‘%‘ AND age>#{1}
</select>


测试类

/**
 * 多条件查询Map集合
 */
@Test
public  void findByManyCondition(){
    SqlSession session = MyBatisUtil.getSession();
    IStudentDAO mapper = session.getMapper(IStudentDAO.class);
   Map<String,Object>  map=new HashMap<String,Object>();
    map.put("name","张");
    map.put("age",20);
    List<Student> list = mapper.findByManyCondition(map);
    for (Student item:list){
        System.out.println(item.getName());
    }
    session.commit();
    session.close();
}

/**
 * 多条件查询使用索引号
 */
@Test
public  void findStudentByCondition(){
    SqlSession session = MyBatisUtil.getSession();
    IStudentDAO mapper = session.getMapper(IStudentDAO.class);
    List<Student> list = mapper.findStudentByCondition("张", 20);
    for (Student item:list){
        System.out.println(item.getName());
    }
    session.commit();
    session.close();
}