mybatis-generator的使用

mybatis-generator的主要作用：

  根据表自动生成bean、dao、mapper.xml（就是自动生成底层的数据库）

1.添加依赖

 <plugin>
          <groupId>org.mybatis.generator</groupId>
          <artifactId>mybatis-generator-maven-plugin</artifactId>
          <version>1.3.5</version>
        </plugin>

2.添加配置文件

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">
<!-- mybatis-generator的核心配置文件 -->
<generatorConfiguration>
  <classPathEntry location="/Users/lichunyu/springboot/repository/mysql/mysql-connector-java/5.1.45/mysql-connector-java-5.1.45.jar" />

  <context id="DB2Tables" targetRuntime="MyBatis3">
    <jdbcConnection driverClass="com.mysql.jdbc.Driver"
        connectionURL="jdbc:mysql://127.0.0.1:3306/poll2.0"
        userId="root"
        password="root">
    </jdbcConnection>

    <!--指定生成的类型为java类型，避免数据库中number等类型字段 -->
    <javaTypeResolver >
      <property name="forceBigDecimals" value="false" />
    </javaTypeResolver>

    <!--自动生成的实体的存放包路径 -->
    <javaModelGenerator targetPackage="com.briup.apps.poll.bean" targetProject="./src/main/java">
      <property name="enableSubPackages" value="true" />
      <property name="trimStrings" value="true" />
    </javaModelGenerator>

    <!--自动生成的*Mapper.xml文件存放路径 -->
    <sqlMapGenerator targetPackage="mapper"  targetProject="./src/main/resources">
      <property name="enableSubPackages" value="true" />
    </sqlMapGenerator>

    <!--自动生成的*Mapper.java存放路径 -->
    <javaClientGenerator type="XMLMAPPER" targetPackage="com.briup.apps.poll.dao"  targetProject="./src/main/java">
      <property name="enableSubPackages" value="true" />
    </javaClientGenerator>

    <!-- 映射配置 -->
     
    <table tableName="poll_survy" domainObjectName="Survy" ></table>
    <!--
    <table tableName="poll_school" domainObjectName="School" ></table>
    <table tableName="poll_grade" domainObjectName="Grade" ></table>
    <table tableName="poll_clazz" domainObjectName="Clazz" ></table>
    <table tableName="poll_course" domainObjectName="Course" ></table>
    <table tableName="poll_grade_course" domainObjectName="GradeCourse" ></table>
    <table tableName="poll_user" domainObjectName="User" ></table>
    <table tableName="poll_option" domainObjectName="Option" ></table>
    <table tableName="poll_question" domainObjectName="Question" ></table>
    <table tableName="poll_questionnaire" domainObjectName="Questionnaire" ></table>
    <table tableName="poll_questionnaire_question" domainObjectName="QuestionnaireQuestion" ></table>
    -->
  </context>
</generatorConfiguration>

3.开始工作(记得关闭项目)

 mvn -Dmybatis.generator.overwrite=true mybatis-generator:generate