简介
说明
本文用示例介绍MyBtisPlus分页时排序的方法。
分页时排序的方法
- 后端OrderItems排序
- 后端Wrapper排序
- 前端指定排序
排序涉及到的类
排序涉及到Page类的List<OrderItem> orders;成员，OrderItem定义如下：
public class OrderItem implements Serializable {
private static final long serialVersionUID = 1L;
//需要进行排序的字段
private String column;
// 是否正序排列，默认 true
private boolean asc = true;
...
}建库建表
DROP DATABASE IF EXISTS mp;
CREATE DATABASE mp DEFAULT CHARACTER SET utf8;
USE mp;
DROP TABLE IF EXISTS `t_user`;
SET NAMES utf8mb4;
CREATE TABLE `t_user`
(
`id` BIGINT(0) NOT NULL AUTO_INCREMENT,
`user_name` VARCHAR(64) NOT NULL COMMENT '用户名（不能重复）',
`nick_name` VARCHAR(64) NULL COMMENT '昵称（可以重复）',
`email` VARCHAR(64) COMMENT '邮箱',
`create_time` DATETIME(0) NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`update_time` DATETIME(0) NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '修改时间',
`deleted_flag` BIGINT(0) NOT NULL DEFAULT 0 COMMENT '0：未删除 其他：已删除',
PRIMARY KEY (`id`) USING BTREE,
UNIQUE KEY `index_user_name_deleted_flag` (`user_name`, `deleted_flag`),
KEY `index_create_time`(`create_time`)
) ENGINE = InnoDB COMMENT = '用户';
INSERT INTO `t_user` VALUES (1, 'knife', '刀刃', 'abc@qq.com', '2021-01-23 09:33:36', '2021-01-23 09:33:36', 0);
INSERT INTO `t_user` VALUES (2, 'sky', '天蓝', '123@qq.com', '2021-01-24 18:12:21', '2021-01-24 18:12:21', 0);执行后的结果：
依赖
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.12.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>MyBatis-Plus_Simple</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>MyBatis-Plus_Simple</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.5.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>com.github.xiaoymin</groupId>
<artifactId>knife4j-spring-boot-starter</artifactId>
<version>3.0.3</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>配置
application.yml
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/mp?characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
username: root
password: 222333
#mybatis-plus配置控制台打印完整带参数SQL语句
mybatis-plus:
configuration:
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl分页插件的配置（必须）
package com.example.demo.config;
import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
@Configuration
public class MyBatisPlusConfig {
@Bean
public MybatisPlusInterceptor mybatisPlusInterceptor() {
MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
return interceptor;
}
}代码
Entity
package com.example.demo.user.entity;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableLogic;
import com.baomidou.mybatisplus.annotation.TableName;
import com.baomidou.mybatisplus.extension.activerecord.Model;
import lombok.Data;
import java.time.LocalDateTime;
@Data
@TableName(value = "t_user")
public class User {
@TableId(value = "id", type = IdType.AUTO)
private Long id;
private String userName;
private String nickName;
private String email;
private LocalDateTime createTime;
private LocalDateTime updateTime;
@TableLogic(delval = "id")
private Long deletedFlag;
}Service
接口
package com.example.demo.user.service;
import com.baomidou.mybatisplus.extension.service.IService;
import com.example.demo.user.entity.User;
public interface UserService extends IService<User> {
}实现
package com.example.demo.user.service.impl;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.demo.user.entity.User;
import com.example.demo.user.mapper.UserMapper;
import com.example.demo.user.service.UserService;
import org.springframework.stereotype.Service;
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {
}Controller
package com.example.demo.user.controller;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.core.metadata.OrderItem;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.example.demo.user.entity.User;
import com.example.demo.user.service.UserService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@Api(tags = "排序")
@RestController
@RequestMapping("sort")
public class SortController {
@Autowired
private UserService userService;
@ApiOperation("默认顺序")
@GetMapping("defaultOrder")
public IPage<User> defaultOrder(Page<User> page) {
return userService.page(page);
}
@ApiOperation("通过orderItems")
@GetMapping("orderItems")
public IPage<User> orderItems(Page<User> page) {
page.addOrder(OrderItem.desc("create_time"));
// 可以指定多列。比如下边这个：按create_time排序，若create_time相同，则按id排序
// page.addOrder(OrderItem.desc("create_time"), OrderItem.asc("id"));
return userService.page(page);
}
@ApiOperation("通过wrapper")
@GetMapping("wrapper")
public IPage<User> wrapper(Page<User> page) {
LambdaQueryWrapper<User> queryWrapper = Wrappers.<User>lambdaQuery();
// 按create_time排序，若create_time相同，则按id排序
queryWrapper.orderByDesc(User::getCreateTime);
queryWrapper.orderByAsc(User::getId);
return userService.page(page, queryWrapper);
}
@ApiOperation("前端指定顺序")
@GetMapping("byFrontEnd")
public IPage<User> byFrontEnd(Page<User> page) {
return userService.page(page);
}
}测试
访问Knife4j页面：http://localhost:8080/doc.html
1.不指定顺序
本处前端不传任何参数进行的测试。
2.后端OrderItem排序（create_time倒序）
本处前端不传任何参数进行的测试。
3.后端Wrapper排序（create_time倒序，id升序）
本处前端不传任何参数进行的测试。
4.前端指定排序（create_time倒序）
前端指定orders[0].asc和orders[0].column
结果：
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