mybatis 通过数据库反向工程

1.在pom中加入以下配置

<plugin>
  <groupId>org.mybatis.generator</groupId>
  <artifactId>mybatis-generator-maven-plugin</artifactId>
  <version>1.3.3</version>
  <configuration>
    <configurationFile>src/main/resources/generatorConfig.xml</configurationFile>     // 这里是反向工程的具体配置文件位置
    <verbose>true</verbose>
    <overwrite>true</overwrite>
  </configuration>
  <executions>
    <execution>
      <id>Generate MyBatis Artifacts</id>
      <goals>
        <goal>generate</goal>
      </goals>
    </execution>
  </executions>
  <dependencies>
    <dependency>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-core</artifactId>
      <version>1.3.3</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.35</version>
      <scope>runtime</scope>
    </dependency>

    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.23</version>
    </dependency>
  </dependencies>
</plugin>

2. 配置文件

<?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>

<!-- mybatis-generator:generate -->

 <context id="base" targetRuntime="MyBatis3">
      <commentGenerator>
         <property name="suppressAllComments" value="true" />
         <property name="suppressDate" value="false" />
      </commentGenerator>
      <jdbcConnection driverClass="com.mysql.jdbc.Driver"
 connectionURL="jdbc:mysql://localhost:3306/testMybatis"
 userId="root" password="123456">                                // 反向工程目标数据库连接设置
      </jdbcConnection>
      <javaModelGenerator targetPackage="com.m1.module"
 targetProject="src\main\java">                                  // 原型类目标配置
         <property name="enableSubPackages" value="false" />
         <property name="trimStrings" value="true" />
      </javaModelGenerator>
      <sqlMapGenerator targetPackage="com.m1.mapper"
 targetProject="src\main\java">                                  // 映射文件目标配置
         <property name="enableSubPackages" value="false" />
      </sqlMapGenerator>
      <javaClientGenerator targetPackage="com.m1.dao"
 targetProject="src\main\java" type="XMLMAPPER">                 // dao层目标配置
         <property name="enableSubPackages" value="false" />
      </javaClientGenerator>
      <table schema="testMybatis" tableName="user" domainObjectName="User" //反向的表配置
 enableCountByExample="false" enableUpdateByExample="false"
 enableDeleteByExample="false" enableSelectByExample="false"
 selectByExampleQueryId="false">
      </table>
      <table schema="testMybatis" tableName="dept" domainObjectName="Dept"
 enableCountByExample="false" enableUpdateByExample="false"
 enableDeleteByExample="false" enableSelectByExample="false"
 selectByExampleQueryId="false">
      </table>
   </context>
</generatorConfiguration>

反向表配置中， 指定数据库表，要生成哪些表，就写哪些表。

schema即为数据库名, tableName为对应的数据库表, domainObjectName是要生成的实体类
如果想要mapper配置文件加入sql的where条件查询, 可以将enableCountByExample等设为true,这样就会生成一个对应domainObjectName的Example类, enableCountByExample等设为false时,就不会生成对应的Example类了.