五、分页

目录：使用Limit分页、RowBounds分页、分页插件

1.使用Limit分页

语法：

select * from user limit startIndex,pageSize;

使用MyBatis实现分页，核心是使用SQL语句。
1）实现接口

package com.ping.dao;
import …
public interface UserMapper {
  //分页
  List getUserByLimit(Map map);
}

2）UserMapper.xml中的sql语句

  select * from  mybatis.user limit #{startIndex},#{pageSize}

3）测试

@Test
public void getUserByLimit(){
  SqlSession sqlSession = MybatisUtils.getSqlSession();
  UserMapper mapper = sqlSession.getMapper(UserMapper.class);
  HashMap map = new HashMap();
  map.put("startIndex",1);
  map.put("pageSize",2);
  List userList =  mapper.getUserByLimit(map);
  for (User user : userList) {
    System.out.println(user);
  }
  sqlSession.close();
}

2.RowBounds分页

不再使用SQL实现分页。
1）实现接口

package com.ping.dao;
import …
public interface UserMapper {
  //分页
  List getUserByRowBounds();
}

2）UserMapper.xml中的sql语句

  select * from  mybatis.user

3）测试

@Test
public void getUserByRowBounds(){
  SqlSession sqlSession = MybatisUtils.getSqlSession();
  //RowBounds实现
  RowBounds rowBounds = new RowBounds(1, 2);
  //通过Java代码层面实现分页
  List userList = sqlSession.selectList("com.kuang.dao.UserMapper.getUserByRowBounds",null,rowBounds);
  for (User user : userList) {
    System.out.println(user);
  }
  sqlSession.close();
}

3.分页插件（了解即可）