MyBatisPlus（四）分页与排序

MyBatisPlus有现成的分页功能，需要将插件添加到配置中

配置分页插件

@Configuration
public class MybatisPlusConfig {
   


    /**
     * 新的分页插件,一缓和二缓遵循mybatis的规则
     *
     * @return
     */
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
   
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
        return interceptor;
    }
}

分页查询并排序

@Test
public void testSelectPage() {
   
    Page<User> page = new Page<>(3, 3);
    page.addOrder(OrderItem.asc("age"));
    Page<User> userPage = userMapper.selectPage(page, null);
    System.out.println("总条数：" + userPage.getTotal());
    System.out.println("当前页数：" + userPage.getCurrent());
    System.out.println("每页大小：" + userPage.getSize());
    System.out.println("当页大小：" + userPage.getRecords().size());
    System.out.println(userPage.getRecords());
}

执行日志：

JDBC Connection [HikariProxyConnection@1347294617 wrapping com.mysql.cj.jdbc.ConnectionImpl@71f96dfb] will not be managed by Spring
==>  Preparing: SELECT COUNT(1) FROM user
==> Parameters: 
<==    Columns: COUNT(1)
<==        Row: 8
<==      Total: 1
==>  Preparing: SELECT id, name, age, email FROM user ORDER BY age ASC LIMIT ?,?
==> Parameters: 6(Long), 3(Long)
<==    Columns: id, name, age, email
<==        Row: 4, Sandy, 21, test4@baomidou.com
<==        Row: 3, Tom, 28, test3@baomidou.com
<==      Total: 2
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@cb0f763]
总条数：8
当前页数：3
每页大小：3
当页大小：2
[User{id=4, name='Sandy', age=21, email='test4@baomidou.com'}, User{id=3, name='Tom', age=28, email='test3@baomidou.com'}]

通过日志可以看出，

• 通过SELECT COUNT(1) FROM user查询出总页数
• 并先排序再通过limit分页查询

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