IDEA 中使用MyBatis-generator 自动生成MyBatis代码

0.在Intellij IDEA创建maven项目

1. 在maven项目的pom.xml 添加mybatis-generator-maven-plugin 插件

<build>  
  <finalName>xxx</finalName>  
  <plugins>  
    <plugin>  
      <groupId>org.mybatis.generator</groupId>  
      <artifactId>mybatis-generator-maven-plugin</artifactId>  
      <version>1.3.2</version>  
      <configuration>  
        <verbose>true</verbose>  
        <overwrite>true</overwrite>  
      </configuration>  
    </plugin>  
  </plugins>  
</build>

2. 在maven项目下的src/main/resources 目录下建立名为 generatorConfig.xml的配置文件，作为mybatis-generator-maven-plugin 插件的执行目标，模板如下：

<?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>
    <!--导入属性配置 -->
    <properties resource="generator.properties"></properties>

    <!--指定特定数据库的jdbc驱动jar包的位置 -->
    <classPathEntry location="${jdbc.driverLocation}"/>

    <context id="default" targetRuntime="MyBatis3">

        <!--jdbc的数据库连接 -->
        <jdbcConnection driverClass="${jdbc.driverClass}" connectionURL="${jdbc.connectionURL}" userId="${jdbc.userId}" password="${jdbc.password}">
        </jdbcConnection>


        <!--生成entity类存放位置-->
        <javaModelGenerator targetPackage="org.louis.hometutor.po" targetProject="src/main/java">
            <!-- 是否对model添加 构造函数 -->
            <property name="constructorBased" value="true"/>
            <!-- 是否对类CHAR类型的列的数据进行trim操作 -->
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>

        <!--生成映射文件存放位置-->
        <sqlMapGenerator targetPackage="org.louis.hometutor.domain" targetProject="src/main/java">
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>

        <!--生成Dao类存放位置-->
        <javaClientGenerator targetPackage="com.foo.tourist.dao" targetProject="src/main/java" type="MIXEDMAPPER">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>



        <table tableName="student" domainObjectName="Student">
            <generatedKey column="id" sqlStatement="select uuid_short()" identity="false"/>
            <!-- 用来修改表中某个列的属性，MBG会使用修改后的列来生成domain的属性；
               column:要重新设置的列名；
               注意，一个table元素中可以有多个columnOverride元素哈~
             -->
            <columnOverride column="user_name">
                <!-- 使用property属性来指定列要生成的属性名称 -->
                <property name="property" value="userName"/>
                <!-- javaType用于指定生成的domain的属性类型，使用类型的全限定名-->
                <property name="javaType" value="java.lang.String"/>
                <!-- jdbcType用于指定该列的JDBC类型-->
                <property name="jdbcType" value="VARCHAR"/>
                <!-- 参考table元素的delimitAllColumns配置，默认为false-->
                <property name="delimitedColumnName" value="true"/>
            </columnOverride>
        </table>

        <table tableName="teacher" domainObjectName="Teacher">
            <generatedKey column="id" sqlStatement="select uuid_short()" identity="false"/>
            <!-- 用来修改表中某个列的属性，MBG会使用修改后的列来生成domain的属性；
               column:要重新设置的列名；
               注意，一个table元素中可以有多个columnOverride元素哈~
             -->
            <columnOverride column="user_name">
                <!-- 使用property属性来指定列要生成的属性名称 -->
                <property name="property" value="userName"/>
                <!-- javaType用于指定生成的domain的属性类型，使用类型的全限定名-->
                <property name="javaType" value="java.lang.String"/>
                <!-- jdbcType用于指定该列的JDBC类型-->
                <property name="jdbcType" value="VARCHAR"/>
                <!-- 参考table元素的delimitAllColumns配置，默认为false-->
                <property name="delimitedColumnName" value="true"/>
            </columnOverride>
        </table>
    </context>
</generatorConfiguration>

这里使用了外置的配置文件generator.properties，可以将一下属性配置到properties文件之中，增加配置的灵活性：

jdbc.driverLocation=D:\\myfolder\\maven_repository\\mysql\\mysql-connector-java\\8.0.15\\mysql-connector-java-8.0.15.jar
jdbc.driverClass=com.mysql.cj.jdbc.Driver
jdbc.connectionURL=jdbc:mysql://localhost:3306/hxe_ant?useSSL=false&characterEncoding=UTF-8&serverTimezone=CTT&useAffectedRows=true&allowPublicKeyRetrieval=true
jdbc.userId=root
jdbc.password=root

　　

项目目录如下：

3. 在Intellij IDEA添加一个“Run运行”选项，使用maven运行mybatis-generator-maven-plugin插件 ：

之后弹出运行配置框，为当前配置配置一个名称，这里其名为"generator",然后在 “Command line” 选项中输入“mybatis-generator:generate  -e”

这里加了“-e ”选项是为了让该插件输出详细信息，这样可以帮助我们定位问题

如果添加成功，则会在run 选项中有“generator” 选项，如下：

点击运行，然后不出意外的话，会在控制台输出：

"C:\Program Files (x86)\Java\jdk1.8.0_73\bin\java.exe" -Dmaven.multiModuleProjectDirectory=D:\myfolder\code\ant-api -Dmaven.home=D:\myfolder\install\apache-maven-3.6.2 -Dclassworlds.conf=D:\myfolder\install\apache-maven-3.6.2\bin\m2.conf "-Dmaven.ext.class.path=D:\myfolder\install\IntelliJ IDEA 2019.2.3\plugins\maven\lib\maven-event-listener.jar" "-javaagent:D:\myfolder\install\IntelliJ IDEA 2019.2.3\lib\idea_rt.jar=58980:D:\myfolder\install\IntelliJ IDEA 2019.2.3\bin" -Dfile.encoding=UTF-8 -classpath D:\myfolder\install\apache-maven-3.6.2\boot\plexus-classworlds-2.6.0.jar org.codehaus.classworlds.Launcher -Didea.version2019.2.3 -s D:\myfolder\install\apache-maven-3.6.2\conf\settings.xml -Dmaven.repo.local=D:\myfolder\maven_repository mybatis-generator:generate -e
[INFO] Error stacktraces are turned on.
[INFO] Scanning for projects...
[WARNING] 
[WARNING] Some problems were encountered while building the effective model for com.huixiaoer:ant-api:jar:1.0.0-SNAPSHOT
[WARNING] 'dependencies.dependency.scope' for org.springframework.cloud:spring-cloud-dependencies:pom must be one of [provided, compile, runtime, test, system] but is 'import'. @ line 91, column 20
[WARNING] 'dependencies.dependency.scope' for org.springframework.boot:spring-boot-devtools:jar must be one of [provided, compile, runtime, test, system] but is 'true'. @ line 116, column 20
[WARNING] 
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING] 
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING] 
[INFO] 
[INFO] -----------------------< com.huixiaoer:ant-api >------------------------
[INFO] Building ant-api 1.0.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- mybatis-generator-maven-plugin:1.3.7:generate (default-cli) @ ant-api ---
[INFO] Connecting to the Database
[INFO] Introspecting table student
[INFO] Introspecting table teacher
[INFO] Generating Example class for table student
[INFO] Generating Record class for table student
[INFO] Generating Mapper Interface for table student
[INFO] Generating SQL Map for table student
[INFO] Generating Example class for table teacher
[INFO] Generating Record class for table teacher
[INFO] Generating Mapper Interface for table teacher
[INFO] Generating SQL Map for table teacher
[INFO] Saving file StudentMapper.xml
[INFO] Saving file TeacherMapper.xml
[INFO] Saving file StudentExample.java
[INFO] Saving file Student.java
[INFO] Saving file StudentMapper.java
[INFO] Saving file TeacherExample.java
[INFO] Saving file Teacher.java
[INFO] Saving file TeacherMapper.java
[WARNING] Cannot obtain primary key information from the database, generated objects may be incomplete
[WARNING] Cannot obtain primary key information from the database, generated objects may be incomplete
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  3.033 s
[INFO] Finished at: 2019-10-31T10:40:32+08:00
[INFO] ------------------------------------------------------------------------

看到BUILD SUCCESS，则大功告成，如果有错误的话，由于添加了-e 选项，会把具体的详细错误信息打印出来的，根据错误信息修改即可