SpringBoot整合MybatisPlus的教程详解
Mybatis-Plus(简称MP)是一个 Mybatis 的增强工具,在 Mybatis 的基础上只做增强不做改变,为简化开发、提高效率而生。
它已经封装好了一些crud方法,对于非常常见的一些sql我们不用写xml了,直接调用这些方法就行,但它也是支持我们自己手动写xml。
帮我们摆脱了用mybatis需要写大量的xml文件的麻烦,非常安逸哦
用过就不想用其他了,太舒服了
好了,我们开始整合整合
新建一个SpringBoot的工程
这里是我整合完一个最终的结构,可以参考一下
<?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>2.4.0</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.zkb</groupId> <artifactId>spring-boot-mybatisplus</artifactId> <version>0.0.1-SNAPSHOT</version> <name>spring-boot-mybatisplus</name> <description>Demo project for Spring Boot</description> <properties> <java.version>11</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </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> <version>8.0.18</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.21</version> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.3.2</version> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-generator</artifactId> <version>3.3.2</version> <scope>test</scope> </dependency> <dependency> <groupId>org.freemarker</groupId> <artifactId>freemarker</artifactId> <version>2.3.30</version> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
引入相关的jar包
可以看到我这边策略也有引入,它与mybatis一样,也有对应生成代码的策略,我们直接用这个来帮我们把代码生成就好
package com.example.mybatisplus; import com.baomidou.mybatisplus.core.toolkit.StringPool; import com.baomidou.mybatisplus.generator.AutoGenerator; import com.baomidou.mybatisplus.generator.InjectionConfig; import com.baomidou.mybatisplus.generator.config.*; import com.baomidou.mybatisplus.generator.config.po.TableInfo; import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy; import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine; import java.util.ArrayList; import java.util.List; public class MysqlGenerator { public static void main(String[] args) { // 代码生成器 AutoGenerator mpg = new AutoGenerator(); // 全局配置 GlobalConfig gc = new GlobalConfig(); String projectPath = System.getProperty("user.dir"); gc.setOutputDir(projectPath + "/src/main/java"); gc.setAuthor("zkb"); gc.setOpen(false); // service 命名方式 gc.setServiceName("%sService"); // service impl 命名方式 gc.setServiceImplName("%sServiceImpl"); gc.setMapperName("%sMapper"); gc.setXmlName("%sMapper"); gc.setFileOverride(true); gc.setActiveRecord(true); // XML 二级缓存 gc.setEnableCache(false); // XML ResultMap gc.setBaseResultMap(true); // XML columList gc.setBaseColumnList(false); // gc.setSwagger2(true); 实体属性 Swagger2 注解 mpg.setGlobalConfig(gc); // 数据源配置 DataSourceConfig dsc = new DataSourceConfig(); dsc.setUrl("jdbc:mysql://localhost:3306/900?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&useSSL=false"); // dsc.setSchemaName("public"); dsc.setDriverName("com.mysql.cj.jdbc.Driver"); dsc.setUsername("root"); dsc.setPassword("baishou888"); mpg.setDataSource(dsc); // 包配置 PackageConfig pc = new PackageConfig(); pc.setParent("com.zkb"); pc.setEntity("model"); pc.setService("service"); pc.setServiceImpl("service.impl"); mpg.setPackageInfo(pc); // 自定义配置 InjectionConfig cfg = new InjectionConfig() { @Override public void initMap() { // to do nothing } }; // 如果模板引擎是 freemarker String templatePath = "/templates/mapper.xml.ftl"; // 如果模板引擎是 velocity // String templatePath = "/templates/mapper.xml.vm"; // 自定义输出配置 List<FileOutConfig> focList = new ArrayList<>(); // 自定义配置会被优先输出 focList.add(new FileOutConfig(templatePath) { @Override public String outputFile(TableInfo tableInfo) { // 自定义输出文件名 , 如果你 Entity 设置了前后缀、此处注意 xml 的名称会跟着发生变化!! return projectPath + "/src/main/resources/mappers/" + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML; } }); /* cfg.setFileCreate(new IFileCreate() { @Override public boolean isCreate(ConfigBuilder configBuilder, FileType fileType, String filePath) { // 判断自定义文件夹是否需要创建 checkDir("调用默认方法创建的目录"); return false; } }); */ cfg.setFileOutConfigList(focList); mpg.setCfg(cfg); // 配置模板 TemplateConfig templateConfig = new TemplateConfig(); // 配置自定义输出模板 //指定自定义模板路径,注意不要带上.ftl/.vm, 会根据使用的模板引擎自动识别 // templateConfig.setEntity("templates/entity2.java"); // templateConfig.setService(); // templateConfig.setController(); templateConfig.setXml(null); mpg.setTemplate(templateConfig); // 策略配置 StrategyConfig strategy = new StrategyConfig(); strategy.setNaming(NamingStrategy.underline_to_camel); strategy.setColumnNaming(NamingStrategy.underline_to_camel); // strategy.setSuperEntityClass("com.baomidou.ant.common.BaseEntity"); strategy.setEntityLombokModel(true); strategy.setRestControllerStyle(true); // 公共父类 // strategy.setSuperControllerClass("com.baomidou.ant.common.BaseController"); // 写于父类中的公共字段 // strategy.setSuperEntityColumns("id"); strategy.setInclude(new String[]{"t_user"}); strategy.setControllerMappingHyphenStyle(true); strategy.setTablePrefix("t" + "_"); mpg.setStrategy(strategy); mpg.setTemplateEngine(new FreemarkerTemplateEngine()); mpg.execute(); } }
我有一个t_user的表
CREATE TABLE `t_user` ( `id` bigint NOT NULL AUTO_INCREMENT, `username` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL, `password` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL, `nickname` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL, `gender` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL, `telephone` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL, `registerdate` datetime NOT NULL, `address` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL, `addTime` timestamp NOT NULL DEFAULT '2015-09-15 00:00:00', `updateTime` timestamp NOT NULL DEFAULT '2015-09-15 00:00:00' ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=44138653810545248 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
我是直接针对它执行策略的,
这几个文件都是策略生成的,我没有去动过
package com.zkb.conf; import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; /** * 配置分页插件 * */ @Configuration public class MybatisPlusConfig { /** * 分页插件 */ @Bean public PaginationInterceptor paginationInterceptor() { return new PaginationInterceptor(); } }
server: port: 8081 servlet: context-path: / spring: datasource: # mysql5.x 配置,高版本需要加useSSL=false #url: jdbc:mysql://localhost:3306/test?characterEncoding=utf8&useSSL=false # mysql8.0 需要加&useSSL=false&serverTimezone=UTC url: jdbc:mysql://localhost:3306/900?zeroDateTimeBehavior=convertToNull&characterEncoding=utf8&useSSL=false&serverTimezone=UTC username: root password: baishou888 # mysql8.0 驱动 driver-class-name: com.mysql.cj.jdbc.Driver # mysql5.x 驱动 #driver-class-name: com.mysql.jdbc.Driver debug: false #Druid# name: test type: com.alibaba.druid.pool.DruidDataSource filters: stat maxActive: 20 initialSize: 1 maxWait: 60000 minIdle: 1 timeBetweenEvictionRunsMillis: 60000 minEvictableIdleTimeMillis: 300000 validationQuery: select 'x' testWhileIdle: true testOnBorrow: false testOnReturn: false poolPreparedStatements: true maxOpenPreparedStatements: 20 jackson: date-format: yyyy-MM-dd HH:mm:ss time-zone: GMT+8 mybatis-plus: configuration: map-underscore-to-camel-case: true auto-mapping-behavior: full log-impl: org.apache.ibatis.logging.stdout.StdOutImpl mapper-locations: classpath*:mapper/**/*Mapper.xml global-config: # 逻辑删除配置 db-config: # 删除前 logic-not-delete-value: 1 # 删除后 logic-delete-value: 0
package com.zkb; import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication @MapperScan("com.zkb.mapper") public class SpringBootMybatisplusApplication { public static void main(String[] args) { SpringApplication.run(SpringBootMybatisplusApplication.class, args); } }
@MapperScan("com.zkb.mapper")一定是扫描到自己mapper的接口类
package com.zkb.controller; import com.zkb.model.User; import com.zkb.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; /** * <p> * 前端控制器 * </p> * * @author zkb * @since 2020-11-23 */ @RestController @RequestMapping("/user") public class UserController { @Autowired private UserService userService; @GetMapping("/getUser") public User getUser(){ return userService.getById(1231); } }
写了一个get方法来测试自己是否与mybatis-plus整合成功,所以直接调用了mybatis-plus内置的方法
当然数据库我自己手动写了一个id为1231的数据
可以看到整合成功了,对吧,真的是超级简单
点击此处demo下载,需要自取
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