6.mybatis-plus-分页

1.简介

MyBatis Plus自带分页插件，只要简单的配置即可实现分页功能

2.入门使用

2.1.创建配置类

此时可以删除主类中的 @MapperScan 扫描注解

@Component
public class MpInterceptor {
     /**
     * 分页拦截器，，存入Spring容器
     * 拦截生成的sql语句，注入limit分页参数
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }
}

2.2.测试selectPage分页

    @Resource
    private UserMapper userMapper;

    @Test
    public void pageTest(){
        Page<User> userPage = new Page<>(1,3);
        userMapper.selectPage(userPage,null);
        System.out.println("列表：");
        List<User> list = userPage.getRecords();
        list.forEach(System.out::println);
        System.out.println("总数："+userPage.getTotal());
        System.out.println("当前页码 = " + userPage.getCurrent());
        System.out.println("总页码 = " + userPage.getPages());
        System.out.println("页码数量 = " + userPage.getSize());
        System.out.println("总数量 = " + userPage.getTotal());
        System.out.println("是否有下一页 = " + userPage.hasNext());
        System.out.println("是否有上一页 = " + userPage.hasPrevious());
    }