2021年4月12日星期一

Mybatis、Mybatis Generator、Mybatis-Plus、Mybatis Plus Generator

1、介绍

Mybatis
Mybatis 是操作数据库的框架:提供一种Mapper类,支持用Java代码对数据库进行增删改查。缺点:需要先在
Mybatis Generator
自动为Mybatis生成简单的增删改查SQL语句的工具
Mybatis-Plus
MyBatis-Plus 是一个Mybatis 增强版工具,在 MyBatis 基础上扩充了功能(由国人团队苞米豆开发)。作用:为了简化开发效率。
Mybatis Plus Generator
比Mybatis Generator更加强大,支持功能更多,可自动生成:Entity、Mapper、Service、Controller等

2、Mybatis Plus Generator用法演示

2.1、工程创建与依赖配置

通过IDEA新建Spring工程,在工程的pom.

<dependencies>  <dependency>   <groupId>org.springframework.boot</groupId>   <artifactId>spring-boot-starter-web</artifactId>  </dependency>  <dependency>   <groupId>org.springframework.boot</groupId>   <artifactId>spring-boot-devtools</artifactId>   <scope>runtime</scope>   <optional>true</optional>  </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>org.springframework.boot</groupId>   <artifactId>spring-boot-starter-test</artifactId>   <scope>test</scope>  </dependency>  <!--mp-->  <dependency>   <groupId>com.baomidou</groupId>   <artifactId>mybatis-plus-boot-starter</artifactId>   <version>3.2.0</version>  </dependency>  <!--模板-->  <dependency>   <groupId>org.springframework.boot</groupId>   <artifactId>spring-boot-starter-freemarker</artifactId>  </dependency>  <!--mysql-->  <dependency>   <groupId>mysql</groupId>   <artifactId>mysql-connector-java</artifactId>   <scope>runtime</scope>  </dependency>  <!--mp代码生成器-->  <dependency>   <groupId>com.baomidou</groupId>   <artifactId>mybatis-plus-generator</artifactId>   <version>3.2.0</version>  </dependency> </dependencies>
2.2、数据库构建与项目配置

使用Navicat创建mysql数据库 "vueblog",创建数据表,SQL语句(自己懒得写,参考某大神的现成的SQL):

CREATE TABLE `m_user` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `username` varchar(64) DEFAULT NULL, `avatar` varchar(255) DEFAULT NULL, `email` varchar(64) DEFAULT NULL, `password` varchar(64) DEFAULT NULL, `status` int(5) NOT NULL, `created` datetime DEFAULT NULL, `last_login` datetime DEFAULT NULL, PRIMARY KEY (`id`), KEY `UK_USERNAME` (`username`) USING BTREE) ENGINE=InnoDB DEFAULT CHARSET=utf8;CREATE TABLE `m_blog` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(20) NOT NULL, `title` varchar(255) NOT NULL, `description` varchar(255) NOT NULL, `content` longtext, `created` datetime NOT NULL ON UPDATE CURRENT_TIMESTAMP, `status` tinyint(4) DEFAULT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8mb4;INSERT INTO `vueblog`.`m_user` (`id`, `username`, `avatar`, `email`, `password`, `status`, `created`, `last_login`) VALUES ('1', 'test', 'https://image-1300566513.cos.ap-guangzhou.myqcloud.com/upload/images/5a9f48118166308daba8b6da7e466aab.jpg', NULL, '96e79218965eb72c92a549dd5a330112', '0', '2020-04-20 10:44:01', NULL);

在工程的application.properties中,配置数据源datasource与mybatis-plus:

server.port=8080# DataSource Configspring.datasource.url=jdbc:mysql://localhost:3306/vueblog?useUnicode=true&useSSL=false&characterEncoding=utf8spring.datasource.username=rootspring.datasource.password=qixingchaospring.datasource.driver-class-name=com.mysql.jdbc.Drivermybatis-plus.mapper-locations=classpath*:/mapper/**Mapper.
2.3、导入、调整CodeGenerator源码

注意:数据源、包名信息一定要根据自己项目信息进行调整

package com.qxc;import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;import com.baomidou.mybatisplus.core.toolkit.StringPool;import com.baomidou.mybatisplus.core.toolkit.StringUtils;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;import java.util.Scanner;public class CodeGenerator { /**  * <p>  * 读取控制台内容  * </p>  */ public static String scanner(String tip) {  Scanner scanner = new Scanner(System.in);  StringBuilder help = new StringBuilder();  help.append("请输入" + tip + ":");  System.out.println(help.toString());  if (scanner.hasNext()) {   String ipt = scanner.next();   if (StringUtils.isNotEmpty(ipt)) {    return ipt;   }  }  throw new MybatisPlusException("请输入正确的" + tip + "!"); } 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("qixingchao");  gc.setOpen(false);  gc.setServiceName("%sService");  mpg.setGlobalConfig(gc);  // 数据源配置  DataSourceConfig dsc = new DataSourceConfig();  dsc.setUrl("jdbc:mysql://localhost:3306/vueblog?useUnicode=true&useSSL=false&characterEncoding=utf8&serverTimezone=UTC");  dsc.setDriverName("com.mysql.cj.jdbc.Driver");  dsc.setUsername("root");  dsc.setPassword("qixingchao");  mpg.setDataSource(dsc);  // 包配置  PackageConfig pc = new PackageConfig();  pc.setModuleName(null);  pc.setParent("com.qxc");  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.
2.4 执行CodeGenerator

右键CodeGenerator.java类 --> 选择"Run 'CodeGenerator.main()' "

IDEA底部弹出输入面板,手动输入数据库表名:

回车,自动生成基础代码:

2.5 代码测试

工程Application类增加自动扫描代码MapperScan:

package com.qxc;import org.mybatis.spring.annotation.MapperScan;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication@MapperScan("com.qxc.mapper")public class VueblogApplication { public static void main(String[] args) {  SpringApplication.run(VueblogApplication.class, args); }}

UserController类里写接口测试方法:

package com.qxc.controller;import com.qxc.service.UserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;/** * <p> * 前端控制器 * </p> * * @author qixingchao * @since 2021-04-12 */@RestController@RequestMapping("/user")public class UserController { @Autowired UserService userService; @GetMapping("/{id}") public Object getUserById(@PathVariable("id")long id){  return userService.getById(id); }}

通过IDEA启动工程,在浏览器输入与接口匹配的URL地址:









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1、介绍MybatisMybatis是操作数据库的框架:提供一种Mapper类,支持用Java代码对数据库进行增删改查。缺点:需要先在MybatisGenerator自动为Mybatis生成简单的增删改查SQL语句的工具Mybatis-PlusMyBatis-Plus是一个Mybatis增强版工具,在MyBatis基础上扩充了功能(由国人团队苞米豆开发)。作用:为了简化开发效率。MybatisPl
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