MyBatis Plus逻辑删除和分页插件使用详解

概要：Mybatis plus 官网链接 ：https://mp.baomidou.com/guide/

一、依赖配置：

<?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>2.2.6.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>demo</artifactId> <version>0.0.1-SNAPSHOT</version> <name>demo</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>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatisplus-spring-boot-starter</artifactId> <version>1.0.5</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <exclusions> <exclusion> <groupId>org.junit.vintage</groupId> <artifactId>junit-vintage-engine</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus</artifactId> <version>3.3.1</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>

二、数据源和插件相关配置

- application.yml

server: port: 8080 servlet: context-path: /# Logger Configlogging: level: com.baomidou.mybatisplus.samples.quickstart: debug

- db.properties

spring.datasource.jdbc-url = jdbc:mysql://localhost:3306/demo?serverTimezone=UTC&characterEncoding=utf8spring.datasource.username = rootspring.datasource.password = 123456spring.datasource.driverClassName = com.mysql.cj.jdbc.Driver

- MybatisPlusConfig

package com.example.demo.config;import com.baomidou.mybatisplus.annotation.DbType;import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;import com.baomidou.mybatisplus.extension.plugins.pagination.optimize.JsqlParserCountOptimize;import org.mybatis.spring.annotation.MapperScan;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.transaction.annotation.EnableTransactionManagement;@EnableTransactionManagement@Configuration@MapperScan('com.example.demo.mapper')public class MybatisPlusConfig { @Bean('paginationInterceptor') public PaginationInterceptor paginationInterceptor() { PaginationInterceptor paginationInterceptor = new PaginationInterceptor(); paginationInterceptor.setCountSqlParser(new JsqlParserCountOptimize(true)); paginationInterceptor.setDbType(DbType.MYSQL); return paginationInterceptor; }}

- SqlSessionConfig

package com.example.demo.config;import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;import org.apache.ibatis.plugin.Interceptor;import org.mybatis.spring.mapper.MapperScannerConfigurer;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.boot.jdbc.DataSourceBuilder;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.PropertySource;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import javax.sql.DataSource;@Configuration@PropertySource('classpath:db/db.properties')public class SqlSessionConfig { private Logger logger = LoggerFactory.getLogger(SqlSessionConfig.class); @Bean('myDatasource') @ConfigurationProperties(prefix='spring.datasource') public DataSource masterDataSource() { return DataSourceBuilder.create().build(); } @Bean('mySqlSessionFactoryBean') public MybatisSqlSessionFactoryBean createSqlSessionFactory(@Qualifier('myDatasource') DataSource dataSource,@Qualifier('paginationInterceptor') PaginationInterceptor paginationInterceptor) { // MybatisSqlSessionFactory MybatisSqlSessionFactoryBean sqlSessionFactoryBean = null; try { // 实例SessionFactory sqlSessionFactoryBean = new MybatisSqlSessionFactoryBean(); // 配置数据源 sqlSessionFactoryBean.setDataSource(dataSource); // 设置 MyBatis-Plus 分页插件 Interceptor [] plugins = {paginationInterceptor}; sqlSessionFactoryBean.setPlugins(plugins); // 加载MyBatis配置文件 PathMatchingResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver(); sqlSessionFactoryBean.setMapperLocations(resourcePatternResolver.getResources('classpath*:mapper/*.xml')); } catch (Exception e) { logger.error('Init SqlSessionFactory Error：{}', e.getMessage()); } return sqlSessionFactoryBean; } @Bean public MapperScannerConfigurer myGetMapperScannerConfigurer() { MapperScannerConfigurer myMapperScannerConfigurer = new MapperScannerConfigurer(); myMapperScannerConfigurer.setBasePackage('com.example.demo.mapper'); myMapperScannerConfigurer.setSqlSessionFactoryBeanName('mySqlSessionFactoryBean'); return myMapperScannerConfigurer; }}

三、测试类

- UserController

package com.example.demo.controller;import com.baomidou.mybatisplus.extension.plugins.pagination.Page;import com.example.demo.bean.UserDTO;import com.example.demo.entity.User;import com.example.demo.service.UserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;import java.time.LocalDateTime;import java.util.List;@RestController@RequestMapping(value = '/demo')public class UserController { @Autowired private UserService userService; @RequestMapping(value = '/create', method = RequestMethod.POST) public String create(@RequestBody UserDTO userDTO){ User user = new User(); user.setName(userDTO.getName()); user.setPhone(userDTO.getPhone()); user.setCreateTime(LocalDateTime.now()); user.setEnable(true); user.setVersion(1L); userService.insert(user); return 'ok'; } @RequestMapping(value = '/delete', method = RequestMethod.POST) public String create(Long id){ userService.deleteById(id); return 'ok'; } @RequestMapping(value = '/update', method = RequestMethod.POST) public String update(@RequestBody UserDTO userDTO){ User user = new User(); user.setId(userDTO.getId()); user.setName(userDTO.getName()); user.setPhone(userDTO.getPhone()); user.setCreateTime(LocalDateTime.now()); userService.updateById(user); return 'ok'; } @RequestMapping(value = '/queryPage', method = RequestMethod.POST) public List<User> update(Integer pageNo, Integer pageSize){ Page<User> page = new Page<>(pageNo, pageSize); return userService.queryList(page, 1); }}

- UserService

package com.example.demo.service.impl;import com.baomidou.mybatisplus.core.metadata.IPage;import com.baomidou.mybatisplus.extension.plugins.pagination.Page;import com.example.demo.mapper.UserMapper;import com.example.demo.entity.User;import com.example.demo.service.UserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import java.util.List;import java.util.Optional;@Servicepublic class UserServiceImpl implements UserService { @Autowired private UserMapper userMapper; @Override public int insert(User user) { return userMapper.insert(user); } @Override public int deleteById(Long id) { return userMapper.deleteById(id); } @Override public int updateById(User user) { return userMapper.updateById(user); } @Override public List<User> queryList(Page<User> page, Integer enable) { return userMapper.selectPageByEnable(page, enable).getRecords(); }}

- UserMapper

package com.example.demo.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;import com.baomidou.mybatisplus.core.metadata.IPage;import com.baomidou.mybatisplus.extension.plugins.pagination.Page;import com.example.demo.entity.User;import org.apache.ibatis.annotations.Mapper;import org.springframework.stereotype.Repository;@Mapper@Repositorypublic interface UserMapper extends BaseMapper<User> { IPage<User> selectPageByEnable(Page<?> page, Integer enable);}

- User

package com.example.demo.entity;import com.baomidou.mybatisplus.annotation.*;import lombok.Data;import java.time.LocalDateTime;@Data@TableName('user')public class User{ @TableId(value = 'id', type = IdType.AUTO) private Long id; @TableField('name') private String name; @TableField('phone') private String phone; @TableField('create_time') private LocalDateTime createTime; @TableLogic(delval = '0', value = '1') @TableField('enable') private boolean enable; @Version @TableField('version') private Long version;}

- SqlMap

<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE mapper PUBLIC '-//mybatis.org//DTD Mapper 3.0//EN' 'http://mybatis.org/dtd/mybatis-3-mapper.dtd'><mapper namespace='com.example.demo.mapper.UserMapper'> <!-- 通用查询映射结果 --> <resultMap type='com.example.demo.entity.User'> <id column='id' property='id' /> <result column='name' property='name' /> <result column='phone' property='phone' /> <result column='create_time' property='createTime' /> <result column='enable' property='enable' /> <result column='version' property='version' /> </resultMap> <select resultMap='BaseResultMap'> SELECT * FROM user WHERE enable=#{enable} order by create_time desc </select></mapper>

- DDL

CREATE TABLE `user` ( `id` bigint NOT NULL AUTO_INCREMENT, `name` varchar(20) NOT NULL, `phone` char(11) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL, `enable` tinyint NOT NULL, `create_time` datetime NOT NULL, `version` bigint NOT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

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