springboot整合mybatis并使用Generator自动生成代码

在上一篇我们完成了springboot整合mybatis实现了基本的增删改查功能,所有的代码基本都是我们手动完成的,这一篇我们学习使用MyBatis的Generator自动生成代码,可以大大减少了我们重复的编码工作,只需要集中力量放在重要的核心业务上面。

基本代码及数据库表信息沿用上一篇的,但是为了跳过上一篇直接阅读本篇的朋友方便快速构建,我们依然会把基本代码贴出来,争取无论阅读哪一篇都可以依据文章成功搭建成demo。

数据库方面

user_t信息如下:

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SET FOREIGN_KEY_CHECKS=0;
 
-- ----------------------------
-- Table structure for user_t
-- ----------------------------
DROP TABLE IF EXISTS `user_t`;
CREATE TABLE `user_t` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `user_name` varchar(255) NOT NULL,
 `password` varchar(255) NOT NULL,
 `age` int(11) DEFAULT NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Table structure for user_t
-- ----------------------------
DROP TABLE IF EXISTS `user_t`;
CREATE TABLE `user_t` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`user_name` varchar(255) NOT NULL,
`password` varchar(255) NOT NULL,
`age` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;

数据库及表创建成功后,回到我们的工程中

第零步,在pom.xml中新增加generator插件,如图:

springboot整合mybatis并使用Generator自动生成代码

配置代码贴出来:

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<properties>
       <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
       <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
       <java.version>1.8</java.version>
   </properties>
 
   <dependencies>
       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-web</artifactId>
       </dependency>
       <dependency>
           <groupId>org.mybatis.spring.boot</groupId>
           <artifactId>mybatis-spring-boot-starter</artifactId>
           <version>1.3.2</version>
       </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>
       </dependency>
 
       <dependency>
           <groupId>com.alibaba</groupId>
           <artifactId>druid</artifactId>
           <version>1.1.0</version>
       </dependency>
 
       <dependency>
           <groupId>org.mybatis.generator</groupId>
           <artifactId>mybatis-generator-core</artifactId>
           <version>1.3.5</version>
       </dependency>
 
   </dependencies>
 
 
   <build>
       <plugins>
           <plugin>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-maven-plugin</artifactId>
           </plugin>
           <plugin>
               <groupId>org.mybatis.generator</groupId>
               <artifactId>mybatis-generator-maven-plugin</artifactId>
               <configuration>
                   <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
                   <overwrite>true</overwrite>
                   <verbose>true</verbose>
               </configuration>
           </plugin>
       </plugins>
   </build>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</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>
</dependency>

<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.0</version>
</dependency>

<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-core</artifactId>
<version>1.3.5</version>
</dependency>

</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<configuration>
<configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
<overwrite>true</overwrite>
<verbose>true</verbose>
</configuration>
</plugin>
</plugins>
</build>

第一步,编辑generator文件:

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
       PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
       "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
   <!-- 数据库驱动:换成你本地的驱动包位置-->
   <classPathEntry  location="E:mysql-connector-java-5.1.46mysql-connector-java-5.1.46.jar"/>
   <context id="DB2Tables"  targetRuntime="MyBatis3">
       <commentGenerator>
           <property name="suppressDate" value="true"/>
           <!-- 是否去除自动生成的注释 true:是 : false:否 -->
           <property name="suppressAllComments" value="true"/>
       </commentGenerator>
       <!--数据库链接URL,用户名、密码 -->
       <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/springboot?useSSL=false" userId="root" password="1011">
       </jdbcConnection>
       <javaTypeResolver>
           <property name="forceBigDecimals" value="false"/>
       </javaTypeResolver>
       <!-- 生成模型的包名和位置-->
       <javaModelGenerator targetPackage="com.javazhiyin.entity" targetProject="src/main/java">
           <property name="enableSubPackages" value="true"/>
           <property name="trimStrings" value="true"/>
       </javaModelGenerator>
       <!-- 生成映射文件的包名和位置-->
       <sqlMapGenerator targetPackage="resources.mapper" targetProject="src/main">
           <property name="enableSubPackages" value="true"/>
       </sqlMapGenerator>
       <!-- 生成DAO的包名和位置-->
       <javaClientGenerator type="XMLMAPPER" targetPackage="com.javazhiyin.dao" targetProject="src/main/java">
           <property name="enableSubPackages" value="true"/>
       </javaClientGenerator>
       <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
       <table tableName="user_t" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
   </context>
</generatorConfiguration>

此时的项目结构如图所示:

springboot整合mybatis并使用Generator自动生成代码

第二步,运行generator生成代码:

run-Edit Configurations-点击绿色的加号,选择maven:

springboot整合mybatis并使用Generator自动生成代码

填写name及运行命令mybatis-generator:generate -e:

springboot整合mybatis并使用Generator自动生成代码

第三步,运行generator ,生成代码:

springboot整合mybatis并使用Generator自动生成代码

运行结束之后,如果成功,我们可以看到按照预想已经生成了entity、dao、及Mapper映射文件。

第四步,编写controller,实现我们所需的功能:

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package com.javazhiyin.controller;
 
import com.javazhiyin.dao.UserMapper;
import com.javazhiyin.entity.User;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
 
/**
* Created by 57783 on 2018/7/6.
*/
@RestController
public class UserController {
   @Resource
   private UserMapper userMapper;
 
   @GetMapping("/showUser/{id}")
   public User getUser(@PathVariable("id") Integer id){
       User user = this.userMapper.selectByPrimaryKey(id);
       return user;
   }
 
   @PostMapping(value = "/addUser")
   public void addUser(@RequestParam("username") String username,
                       @RequestParam("password") String password,
                       @RequestParam("age") Integer age){
       User user = new User();
       user.setUserName(username);
       user.setPassword(password);
       user.setAge(age);
       userMapper.insert(user);
   }
 
   @PutMapping(value = "updUser/{id}")
   public void updUser(@PathVariable("id") Integer id,
                       @RequestParam("username") String username,
                       @RequestParam("password") String password,
                       @RequestParam("age") Integer age){
       User user = new User();
       user.setId(id);
       user.setUserName(username);
       user.setPassword(password);
       user.setAge(age);
       userMapper.updateByPrimaryKey(user);
 
   }
 
   @DeleteMapping(value = "delUser/{id}")
   public void delUser(@PathVariable("id") Integer id){
       userMapper.deleteByPrimaryKey(id);
   }
 
}

import com.javazhiyin.dao.UserMapper;
import com.javazhiyin.entity.User;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;

/**
* Created by 57783 on 2018/7/6.
*/
@RestController
public class UserController {
@Resource
private UserMapper userMapper;

@GetMapping("/showUser/{id}")
public User getUser(@PathVariable("id") Integer id){
User user = this.userMapper.selectByPrimaryKey(id);
return user;
}

@PostMapping(value = "/addUser")
public void addUser(@RequestParam("username") String username,
@RequestParam("password") String password,
@RequestParam("age") Integer age){
User user = new User();
user.setUserName(username);
user.setPassword(password);
user.setAge(age);
userMapper.insert(user);
}

@PutMapping(value = "updUser/{id}")
public void updUser(@PathVariable("id") Integer id,
@RequestParam("username") String username,
@RequestParam("password") String password,
@RequestParam("age") Integer age){
User user = new User();
user.setId(id);
user.setUserName(username);
user.setPassword(password);
user.setAge(age);
userMapper.updateByPrimaryKey(user);

}

@DeleteMapping(value = "delUser/{id}")
public void delUser(@PathVariable("id") Integer id){
userMapper.deleteByPrimaryKey(id);
}

}

最后,我们修改Bootdemo04Application启动类,添加@MapperScan注解,使其可以扫描DAO层接口

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package com.javazhiyin;
 
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
@SpringBootApplication
 
@MapperScan("com.javazhiyin.dao")
public class Bootdemo04Application {
 
   public static void main(String[] args) {
       SpringApplication.run(Bootdemo04Application.class, args);
   }
}

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

@MapperScan("com.javazhiyin.dao")
public class Bootdemo04Application {

public static void main(String[] args) {
SpringApplication.run(Bootdemo04Application.class, args);
}
}

这样,我们就实现了上一篇与上一篇同样的功能,测试与上一篇基本一致,这里不做测试演示。需要注意的是,我们这里没有编写Service代码,偷了个懒,大家可以加上,代码结构更加好一些。

只有这四个增删改查可能不会感觉多方便,如果有大量的表,省去我们编写基本的DAO、Entity及Mapper映射,回非常的nice。

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