MyBatis逆向工程（MBG）

MyBatis Generator简介 

简称MBG，是一个专门为MyBatis框架使用者定 制的代码生成器，可以快速的根据表生成对应的 映射文件，接口，以及bean类。支持基本的增删 改查，以及QBC风格的条件查询。但是表连接、 存储过程等这些复杂sql的定义需要我们手工编写 

官方文档地址 http://www.mybatis.org/generator/

官方工程地址 https://github.com/mybatis/generator/releases

MBG使用

generator,xml配置

<?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>
    <!--
        targetRuntime="MyBatis3Simple":生成简单版的CRUD
        MyBatis3:豪华版

     -->

    <context id="DB2Tables" targetRuntime="MyBatis3">
        <!--jdbcConnection指定如何连接数据库-->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=utf-8&serverTimezone=GMT%2B8&useSSL=false"
                        userId="root"
                        password="10043632">
        </jdbcConnection>

        <javaTypeResolver >
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <!-- javaModelGenerator：指定javaBean的生成策略
        targetPackage="com.javabean"：目标包名
        targetProject="./src"：生成在哪（直接生成在目标工程下）
        -->
        <javaModelGenerator targetPackage="com.javaBean" targetProject="./src">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!-- sqlMapGenerator：sql映射生成策略，配置SQL 映射文件存放的位置-->
        <sqlMapGenerator targetPackage="com.sqlMapper"  targetProject="./src">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <!-- javaClientGenerator:指定mapper接口所在的位置 -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.mapperInterface"  targetProject="./src">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!-- 指定要逆向分析哪些表：根据表要创建javaBean,tableName指定表名 -->
        <table tableName="userinfo" domainObjectName="UserInfo"></table>

    </context>
</generatorConfiguration>

生成器代码

public class Main {

    public SqlSessionFactory getSqlSessionFactory() throws IOException {
        String path = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(path);
        return new SqlSessionFactoryBuilder().build(inputStream);
    }

    @Test
    public void test() throws IOException, XMLParserException, InvalidConfigurationException, SQLException, InterruptedException {
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        String path = "mbg.xml";
        File configFile = new File(path);
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
        myBatisGenerator.generate(null);
    }

    @Test
    public void testselect() throws IOException {
        SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
        SqlSession sqlSession = sqlSessionFactory.openSession();

        try {
            UserInfoMapper userInfoMapper = sqlSession.getMapper(UserInfoMapper.class);
            UserInfo userInfo = userInfoMapper.selectByPrimaryKey(1);
            System.out.println(userInfo.getUserid());
        }finally {
            sqlSession.close();
        }
    }
}