SpringBoot 之 Mybatis 逆向工程

1. 今天給你們介紹在 spring- boot 項目中如何使用 maven 插件逆向工程生成 Mybatis 代碼。

   pom.xml 添加依賴和插件

   <dependency>
       <groupId>org.mybatis.spring.boot</groupId>
       <artifactId>mybatis-spring-boot-starter</artifactId>
       <version>1.3.0</version>
   </dependency>
   
   <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>
                  <version>1.3.2</version>
                  <configuration>
         <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
                      <overwrite>true</overwrite>
                      <verbose>true</verbose>
                  </configuration>
                  <dependencies>
                      <dependency>
                          <groupId>mysql</groupId>
                          <artifactId>mysql-connector-java</artifactId>
                          <version>5.1.29</version>
                          <scope>runtime</scope>
                      </dependency>
                  </dependencies>
              </plugin>
              <plugin>
                  <groupId>org.jacoco</groupId>
                  <artifactId>jacoco-maven-plugin</artifactId>
                  <version>0.8.2</version>
                  <executions>
                      <execution>
                          <id>pre-test</id>
                          <goals>
                              <goal>prepare-agent</goal>
                          </goals>
                      </execution>
                      <execution>
                          <id>pre-test</id>
                          <phase>test</phase>
                          <goals>
                              <goal>report</goal>
                          </goals>
                      </execution>
                      <execution>
                          <id>post-test-aggregate</id>
                          <phase>test</phase>
                          <goals>
                              <goal>report-aggregate</goal>
                          </goals>
                      </execution>
                  </executions>
              </plugin>
    </plugins>
   </build>

   上圖還配置了 jacoco 插件，爲了使用看代碼單元測試的覆蓋率，不須要的同窗能夠去掉此插件。

   在 resources 根目錄下建立 generator 文件夾，再在此文件夾下建立 generatorConfig.xml。

   <?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>
       <context id="DB2Tables"  targetRuntime="MyBatis3">
           <commentGenerator>
               <property name="suppressDate" value="true"/>
               <!-- 是否去除自動生成的註釋 -->
               <property name="suppressAllComments" value="true"/>
           </commentGenerator>
           <!--數據庫連接信息 -->
           <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                           connectionURL="jdbc:mysql://localhost:3306/parse_json"
                           userId="root"
                           password="root">
           </jdbcConnection>
           <javaTypeResolver>
               <!-- 是否使用bigDecimal， false可自動轉化如下類型（Long, Integer, Short, etc.） -->
               <property name="forceBigDecimals" value="false"/>
           </javaTypeResolver>
           <!-- 生成實體類的包名和位置 ，targetPackage指的是包名,targetProject值得是路徑位置-->
           <javaModelGenerator targetPackage="com.rookie.model" 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="main.resources.com.rookie.mapper" targetProject="src">
               <property name="enableSubPackages" value="true"/>
           </sqlMapGenerator>
           <!-- 生成DAO的包名和位置-->
           <javaClientGenerator type="XMLMAPPER" targetPackage="com.rookie.mapper" targetProject="src/main/java">
               <property name="enableSubPackages" value="true"/>
           </javaClientGenerator>
           <!-- 要生成的表 tableName是數據庫中的表名或視圖名 domainObjectName是實體類名-->
           <table tableName="input_file_path" domainObjectName="FilePathDO"
                  enableCountByExample="false" enableUpdateByExample="false"
                  enableDeleteByExample="false" enableSelectByExample="false"
                  selectByExampleQueryId="false">
           </table>
       </context>
   </generatorConfiguration>

2. 項目結構如圖。按照如圖所示，點擊插件生成便可。