Mybatis使用Mybatis-generator插件及配置（数据库逆向工程）

Mybatis使用Mybatis-generator插件

首先在POM.xml文件添加架包，我这里用的是SpringBoot，所以用的也是SpringBoot架包，最少要mybatis，generator，mysql

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

    <dependency>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-maven-plugin</artifactId>
      <version>1.3.5</version>
  </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.41</version>
    </dependency>
<!--最好添加一个线程池-->
   <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.3</version>
    </dependency>

导入插件依赖包后，在plugins内配置

 <!--配置mybatis自动生成代码generator-->
        <plugin>
          <groupId>org.mybatis.generator</groupId>
          <artifactId>mybatis-generator-maven-plugin</artifactId>
          <version>1.3.5</version>
          <dependencies>
            <dependency>
              <groupId>org.mybatis.generator</groupId>
              <artifactId>mybatis-generator-core</artifactId>
              <version>1.3.5</version>
            </dependency>
            <dependency>
              <groupId>mysql</groupId>
              <artifactId>mysql-connector-java</artifactId>
              <version>5.1.41</version>
            </dependency>
          </dependencies>
          <executions>
            <execution>
              <id>mybatis generator</id>
              <phase>package</phase>
              <goals>
                <goal>generate</goal>
              </goals>
            </execution>
          </executions>
          <configuration>
            <!--允许移动生成文件-->
            <verbose>true</verbose>
            <!--允许自动覆盖文件-->
            <overwrite>true</overwrite>
            <configurationFile>
              src/main/resources/mybatis-generator.xml
            </configurationFile>
          </configuration>
        </plugin>

然后在resources包下创建mybatis-generator.xml配置文件（注意名字一定一模一样，我就是把-写成了_弄了大半天）

首先在JdbcConnection的标签内配置类，url，userId，pwd等,javaModelGenerator中配置java Bean对应的路径，

sqlMapgenerator的映射路径，mybatis的mapping映射；javaClientGenerator里填写dao层的路径，最后配置数据库的表table，最好加上enableCountByExample="false" ，enableUpdateByExample="false"enableDeleteByExample="false" enableSelectByExample="false"selectByExampleQueryId="false"。

<?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">
        <!--数据库连接地址账号密码-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://127.0.0.1:3306/mssc"
                        userId="root"
                        password="111111">
        </jdbcConnection>

        <javaTypeResolver >
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>
        <!--生成Model（DataObject类）存放的位置-->
        <javaModelGenerator targetPackage="com.dspro.dataobject" targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>
        <!--生成映射文件存放位置-->
        <sqlMapGenerator targetPackage="mapping"  targetProject="src/main/resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>
        <!--生成Dao类文件存放-->
        <!--客户端代码，生成易于使用的针对Model对象和XML配置文件的代码-->
        <!--type="ANNOTATEDMAPPER" 生成javaModel和基于注解的Mapper对象-->
        <!--type="MIXEDMAPPER",生成基于注解的javaModel和相应的Mapper对象-->
        <!--type="XMLMAPPER",生成SQLMAP XML文件和独立的Mapper接口-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.dspro.dao"  targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!--<table schema="DB2ADMIN" tableName="ALLTYPES" domainObjectName="Customer" >-->
            <!--<property name="useActualColumnNames" value="true"/>-->
            <!--<generatedKey column="ID" sqlStatement="DB2" identity="true" />-->
            <!--<columnOverride column="DATE_FIELD" property="startDate" />-->
            <!--<ignoreColumn column="FRED" />-->
            <!--<columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" />-->
        <!--</table>-->
        <table tableName="user_info" domainObjectName="UserDO"
               enableCountByExample="false" enableUpdateByExample="false"
               enableDeleteByExample="false" enableSelectByExample="false"
               selectByExampleQueryId="false">
        </table>
        <table tableName="user_password" domainObjectName="UserPasswordDo"
               enableCountByExample="false" enableUpdateByExample="false"
               enableDeleteByExample="false" enableSelectByExample="false"
               selectByExampleQueryId="false"></table>

    </context>
</generatorConfiguration>

enableCountByExample="false" enableUpdateByExample="false"
               enableDeleteByExample="false" enableSelectByExample="false"
               selectByExampleQueryId="false"
这几个配置了之后就不会产生example类，不然新版本会产生一个example文件。

上面是我自己的配置，需要官方配置xml文件的官方配置

然后(IDEA)run-->edit configurations,点击"+"添加maven，在Command line处填写

mybatis-generator:generate
命令，
点击OK，然后run。

错误：

   "POM for xxx is missing, no dependency information available"
        The POM for org.eclipse.m2e:lifecycle-mapping:jar:1.0. is missing, no dependency information available

在POM里添加：

        <plugin>
          <groupId>org.eclipse.m2e</groupId>
          <artifactId>lifecycle-mapping</artifactId>
          <version>1.0.</version>
          <configuration>
            <lifecycleMappingMetadata>
              <pluginExecutions>
                <pluginExecution>
                  <pluginExecutionFilter>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-enforcer-plugin</artifactId>
                    <versionRange>[1.2,)</versionRange>
                    <goals>
                      <goal>enforce</goal>
                    </goals>
                  </pluginExecutionFilter>
                  <action>
                    <ignore />
                  </action>
                </pluginExecution>
              </pluginExecutions>
            </lifecycleMappingMetadata>
          </configuration>
        </plugin>