本篇内容主要讲解“MyBatis Plus分页时怎么实现排序”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“MyBatis Plus分页时怎么实现排序”吧!
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;
...
}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：
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> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.5.1</version> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <groupId>com.github.xiaoymin</groupId> <artifactId>knife4j-spring-boot-starter</artifactId> <version>3.0.3</version> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
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 {
/**
* 分页插件
*/
@Bean
public MybatisPlusInterceptor mybatisPlusInterceptor() {
MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
return interceptor;
}
}代码
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;
/**
* 用户名（不能重复）
*/
private String userName;
* 昵称（可以重复）
private String nickName;
* 邮箱
private String email;
* 创建时间
private LocalDateTime createTime;
* 修改时间
private LocalDateTime updateTime;
* 0：未删除 其他：已删除
@TableLogic(delval = "id")
private Long deletedFlag;
}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 {
}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"));
@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) {
}访问Knife4j页面：http://localhost:8080/doc.html
本处前端不传任何参数进行的测试。
本处前端不传任何参数进行的测试。
本处前端不传任何参数进行的测试。
前端指定orders[0].asc和orders[0].column
结果：
到此，相信大家对“MyBatis Plus分页时怎么实现排序”有了更深的了解，不妨来实际操作一番吧！这里是亿速云网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
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