Spring Boot專案開發（一）——通過mybatis-generator自動生成基礎程式碼
阿新 • • 發佈：2020-12-05
一、建立專案
通過IDEA的Initializr建立專案，詳情參見：Spring Boot入門
二、新增專案依賴
新增Mybatis、Mysql、mybatis-generator（用於生成專案基礎程式碼）依賴
<?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>2.2.1.RELEASE</version> <relativePath/> <!-- lookup parent from repository--> </parent> <groupId>com.learn</groupId> <artifactId>mall</artifactId> <version>0.0.1-SNAPSHOT</version> <name>mall</name> <description>mall 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>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!--新增mybatis依賴--> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <!--新增MySQL依賴--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> <!--新增mybatis逆向工程外掛--> <plugin> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-maven-plugin</artifactId> <version>1.3.7</version> <configuration> <verbose>true</verbose> <overwrite>true</overwrite> </configuration> </plugin> </plugins> </build> </project>
三、編寫generatorConfig.xml配置檔案
編寫generatorConfig.xml配置檔案，將檔案放在resources目錄下，配置檔案官網地址：http://mybatis.org/generator/configreference/xmlconfig.html
<?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> <!-- 指定資料連線驅動jar地址 --> <classPathEntry location="D:\software\apache-maven-3.5.2\repository4\mysql\mysql-connector-java\8.0.18\mysql-connector-java-8.0.18.jar"/> <!-- 一個數據庫一個context --> <context id="MySQLTables" targetRuntime="MyBatis3"> <!-- 註釋 --> <commentGenerator> <!-- 是否取消註釋 --> <property name="suppressAllComments" value="true"/> <!-- 是否生成註釋代時間戳--> <property name="suppressDate" value="true"/> </commentGenerator> <!-- jdbc連線 --> <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver" connectionURL="jdbc:mysql://192.168.211.128:3316/mall?serverTimeZone=UTC& useUnicode=true&characterEncoding=utf-8&useSSL=true" userId="root" password="123456"/> <!-- 型別轉換 --> <javaTypeResolver> <!-- 是否使用bigDecimal， false可自動轉化以下型別（Long, Integer, Short, etc.） --> <property name="forceBigDecimals" value="false"/> </javaTypeResolver> <!-- 生成實體類地址 --> <javaModelGenerator targetPackage="com.learn.mall.model.pojo" targetProject="src/main/java"> <!-- 是否在當前路徑下新加一層schema,eg：fase路徑com.oop.eksp.user.model， true:com.oop.eksp.user.model.[schemaName] --> <property name="enableSubPackages" value="true"/> <!-- 是否針對string型別的欄位在set的時候進行trim呼叫 --> <property name="trimStrings" value="true"/> <!--建立的model物件是否不可改變，即生成的Model物件不會有setter方法，只有構造方法--> <property name="immutable" value="false"/> </javaModelGenerator> <!-- 生成mapper對映檔案存放位置即xml檔案 --> <sqlMapGenerator targetPackage="mappers" targetProject="src/main/resources"> <!-- 是否在當前路徑下新加一層schema,eg：fase路徑com.oop.eksp.user.model， true:com.oop.eksp.user.model.[schemaName] --> <property name="enableSubPackages" value="true"/> </sqlMapGenerator> <!-- 生成dao類存放位置 --> <javaClientGenerator type="XMLMAPPER" targetPackage="com.learn.mall.model.dao" targetProject="src/main/java"> <property name="enableSubPackages" value="false"/> </javaClientGenerator> <!-- 配置表資訊 --> <!--tableName為對應的資料庫表 domainObjectName是要生成的實體類 enable*ByExample 是否生成 example類 --> <table tableName="mall_cart" domainObjectName="Cart" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false" selectByExampleQueryId="false"> </table> <table tableName="mall_category" domainObjectName="Category" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false" selectByExampleQueryId="false"> </table> <table tableName="mall_order" domainObjectName="Order" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false" selectByExampleQueryId="false"> </table> <table tableName="mall_order_item" domainObjectName="OrderItem" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false" selectByExampleQueryId="false"> </table> <table tableName="mall_product" domainObjectName="Product" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false" selectByExampleQueryId="false"> </table> <table tableName="mall_user" domainObjectName="User" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false" selectByExampleQueryId="false"> </table> </context> </generatorConfiguration>
四、啟動mybatis-generator生成基礎程式碼
開啟IDEA的Maven Projects視窗，點選mybatis-generator啟動外掛，執行完成後即可生成基礎程式碼
注意：程式碼生成之後需要給所有的Mapper檔案加上@Repository註解，否則Service注入時會報錯
package com.learn.mall.model.dao; import com.learn.mall.model.pojo.Cart; import org.springframework.stereotype.Repository; @Repository public interface CartMapper { int deleteByPrimaryKey(Integer id); int insert(Cart record); int insertSelective(Cart record); Cart selectByPrimaryKey(Integer id); int updateByPrimaryKeySelective(Cart record); int updateByPrimaryKey(Cart record); }
五、編寫測試demo
1、在application.properties配置檔案中配置資料庫資訊
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver spring.datasource.username=root spring.datasource.password=123456 spring.datasource.url=jdbc:mysql://192.168.211.128:3316\ /mall?serverTimeZone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true mybatis.mapper-locations=classpath:mappers/*.xml
2、編寫Service層介面
package com.learn.mall.service; import com.learn.mall.model.pojo.User; public interface UserService { User getUser(); }
3、編寫ServiceImpl
package com.learn.mall.service.impl; import com.learn.mall.model.dao.UserMapper; import com.learn.mall.model.pojo.User; import com.learn.mall.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; @Service public class UserServiceImpl implements UserService { @Autowired UserMapper userMapper; @Override public User getUser() { return userMapper.selectByPrimaryKey(1); } }
4、編寫Controller
package com.learn.mall.controller; import com.learn.mall.model.pojo.User; import com.learn.mall.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.ResponseBody; @Controller public class UserController { @Autowired UserService userService; @GetMapping("/test") @ResponseBody public User getUser(){ return userService.getUser(); } }
5、瀏覽器請求測試