mybatis中分页查询

Posted 2020-09-18 pclover11

1 如果在查询方法中有多个参数，可以使用map对象将所有数据都存储进去。比如分页查询，需要用到两个参数，可以将这两个参数包装到map中。

例子：分页查询

dao层方法

public List<Student> getStudentPage(int pstart, int pnumber) throws Exception{
        SqlSession sqlSession = MybatisUtil.getSqlSession();
        Map<String,Integer> map =  new HashMap<String, Integer>();
        map.put("pstart", pstart);
        map.put("pnumber", pnumber);
        
        try{
            return sqlSession.selectList(Student.class.getName() + ".getStudentPage", map);
        }catch(Exception e){
            e.printStackTrace();
            throw new RuntimeException(e);
            
        }finally{
            MybatisUtil.closeSqlSession();
        }
    }

 

映射文件studentmapper.xml

<select id="getStudentPage" parameterType="map" resultMap="studentMap">
        select id,sname,salary
        from student
        limit #{pstart},#{pnumber}
    
    </select>