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!简介分页时排序的方法后端OrderIte
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
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;@Configurationpublic class MyBatisPlusConfig { @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; 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;@Servicepublic 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!这里是编程网网站,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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