Mybatis的逆向工程

1.添加依赖以及配置文件

 <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.7</version>
    </dependency>

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.18</version>
    </dependency>

    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.12</version>
    </dependency>

    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>5.2.0</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.mybatis.generator</groupId>
        <artifactId>mybatis-generator-maven-plugin</artifactId>
        <version>1.3.7</version>
        <dependencies>
          <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.7</version>
          </dependency>

          <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.5</version>
          </dependency>

          <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.18</version>
          </dependency>
        </dependencies>
      </plugin>
    </plugins>
  </build>
</project>

2.设置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="mysql" targetRuntime="MyBatis3">
        <!-- Mysql数据库连接的信息：驱动类、连接地址、用户名、密码 -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/mybatis?autoReconnect=true&amp;useUnicode=true&amp;characterEncoding=utf8&amp;useSSL=false&amp;allowMultiQueries=true&amp;serverTimezone=UTC"
                        userId="root"
                        password="admin">
        </jdbcConnection>
        <!-- 默认为false，把JDBC DECIMAL 和NUMERIC类型解析为Integer，为true时 把JDBC DECIMAL 和NUMERIC类型解析为java.math.BigDecimal -->
        <javaTypeResolver >
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>
        <!-- targetProject：生成POJO类的位置 -->
        <javaModelGenerator targetPackage="org.example.po" targetProject="src/main/java">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="true" />
            <!-- 从数据库返回的值被清理前后的空格 -->
            <property name="trimStrings" value="true" />
        </javaModelGenerator>
        <!-- targetProject：mapper映射文件生成的位置 -->
        <sqlMapGenerator targetPackage="org.example.mapper"  targetProject="src/main/resources">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>
        <!-- targetProject：mapper接口生成的的位置 -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="org.example.mapper"  targetProject="src/main/java">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>
        <!-- 指定数据表 对应的类名-->
        <table  tableName="t_emp" domainObjectName="Emp" >
        </table>
        <table  tableName="t_dept" domainObjectName="Dept" >
        </table>
    </context>
</generatorConfiguration>

3.点击maven依赖中的自动生成，则生成相应的类和接口