MyBatis-逆向工程

MyBatis Generator：

　　简称MBG，是专门为MyBatis开发者定制的代码生成器，可以快速的根据数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 过程这些复杂的SQL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

1. 依赖包：

    <dependencies>
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.7</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-maven-plugin</artifactId>
            <version>1.3.7</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
    </dependencies>

2. 建立一个mbg.xml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>
    <!--
        targetRuntime="MyBatis3Simple"：生成简单版的CRUD
        targetRuntime="MyBatis3"：生成豪华版，复杂查询，动态映射等
     -->
    <context id="DB2Tables" targetRuntime="MyBatis3Simple">
        <commentGenerator>
            <property name="suppressDate" value="true"/>   <!-- 是否去除注释时间戳，去除为true -->
            <property name="suppressAllComments" value="true"/>    <!-- 是否去除注释，去除为true -->
        </commentGenerator>
        <!-- jdbcConnection:如何连接到目标数据库 -->
        <jdbcConnection driverClass="org.gjt.mm.mysql.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/mybatis"
                        userId="root"
                        password="123456">
        </jdbcConnection>
        <javaTypeResolver >
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>
        <!-- javaModelGenerator:指定javaBean的生成策略
            targetPackage：目标包名
            targetProject：目标工程
        -->
        <javaModelGenerator targetPackage="cn.ll.mybatis.vo" targetProject=".src/main/java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>
        <!-- sqlMapGenerator：sql映射生成策略
            targetPackage：目标包名
            targetProject：目标工程
         -->
        <sqlMapGenerator targetPackage="cn.ll.mybatis.dao"  targetProject=".src/main/java">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>
        <!-- javaClientGenerator：指定Mapper接口所在的位置
            targetPackage：目标包名
            targetProject：目标工程
        -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="cn.ll.mybatis.dao"  targetProject=".src/main/java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>
        <!-- table：指定要逆向分析哪些表：根据表要创建javabean
            tableName；表名
            domainObjectName：要生成的类名
        -->
        <table tableName="employee" domainObjectName="Employee"></table>
    </context>
</generatorConfiguration>

3. 通过加载xml配置，生成对应文件：

public class MbgTest {
    @Test
    public void testMbg() throws Exception {
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("src/main/resources/mbg.xml");
        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);
    }
}