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版权声明

• 本文原创作者：谷哥的小弟
• 作者博客地址：http://blog.csdn.net/lfdfhl

概述

MyBatis逆向工程，简称MBG。它是一个专门为MyBatis框架使用者定制的代码生成器，它可以快速的根据表生成对应的映射文件xxxMapper.xml，接口xxxMapper.java，以及JavaBean类对象。

接下来，我们以示例的形式学习MBG的使用。

数据准备

DROP DATABASE IF EXISTS mybatisDatabase;CREATE DATABASE mybatisDatabase;use mybatisDatabase;CREATE TABLE user(  id INT PRIMARY KEY auto_increment,  name VARCHAR(50),  password VARCHAR(50),  gender VARCHAR(10));CREATE TABLE student(  id INT PRIMARY KEY auto_increment,  name VARCHAR(50),  address VARCHAR(50),  gender VARCHAR(10));INSERT INTO user(name,password,gender) VALUES("lucy","123456","female");INSERT INTO user(name,password,gender) VALUES("momo","234567","female");INSERT INTO user(name,password,gender) VALUES("xixi","345678","female");INSERT INTO user(name,password,gender) VALUES("pepe","456123","female");INSERT INTO student(name,address,gender) VALUES("tome","BeiJing","female");INSERT INTO student(name,address,gender) VALUES("dodo","ChengDu","female");INSERT INTO student(name,address,gender) VALUES("mbmb","ZhangYe","female");INSERT INTO student(name,address,gender) VALUES("zxzx","BaoDing","female");SELECT * FROM user;SELECT * FROM student;

搭建开发环境

创建普通的Java工程，结构如下：

• log4j-1.2.17.jar
• mybatis-3.4.1.jar
• mybatis-generator-core-1.3.2.jar
• mysql-connector-java-5.1.7-bin.jar

其中，mybatis-generator-core-1.3.2.jar专门用于MyBatis逆向工程

log4j.properties

# Global logging configurationlog4j.rootLogger=DEBUG, stdout# Console output...log4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

generatorConfig.xml

在工程Mybatis012根目录下创建generatorConfig.xml，图示如下：

Generator

在cn.com.generator包下建立Generator，其内容如下：

package cn.com.generator;import java.io.File;import java.util.ArrayList;import java.util.List;import org.mybatis.generator.api.MyBatisGenerator;import org.mybatis.generator.config.Configuration;import org.mybatis.generator.config.xml.ConfigurationParser;import org.mybatis.generator.internal.DefaultShellCallback;public class Generator {
   	public static void main(String[] args) throws Exception {
   		List
   
     warnings = new ArrayList
    
     ();		boolean overwrite = true;		//读取generatorConfig.xml配置文件		File configFile = new File("generatorConfig.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);	}}
    
   

自动生成代码

运行Generator后再刷新整个Java工程即可见自动生成的代码，图示如下：

mybatis-config.xml

在自动生成代码后再创建并配置mybatis-config.xml文件，其内容如下：

MybatisTest

创建MybatisTest测试该逆向工程，其代码如下：

package cn.com.test;import java.io.InputStream;import java.util.Iterator;import java.util.List;import org.apache.ibatis.io.Resources;import org.apache.ibatis.session.SqlSession;import org.apache.ibatis.session.SqlSessionFactory;import org.apache.ibatis.session.SqlSessionFactoryBuilder;import org.junit.Test;import cn.com.mapper.StudentMapper;import cn.com.mapper.UserMapper;import cn.com.pojo.Student;import cn.com.pojo.User;/** * 本文作者：谷哥的小弟 * 博客地址：http://blog.csdn.net/lfdfhl */public class MybatisTest {
   	static SqlSessionFactory sqlSessionFactory = null;	public static SqlSessionFactory getSqlSessionFactory() {
   		try {
   			if (sqlSessionFactory == null) {
   				InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");				SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();				sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);			}			return sqlSessionFactory;		} catch (Exception e) {
   			// TODO: handle exception		} finally {
   		}		return null;	}			@Test	public void testUser() {
   		//获取SqlSession		SqlSession sqlSession=getSqlSessionFactory().openSession();		//利用SqlSession得到Mapper		UserMapper userMapper = sqlSession.getMapper(UserMapper.class);		List
   
     userList = userMapper.selectAll();		Iterator
    
      iterator = userList.iterator();		while(iterator.hasNext()) {
   			User user = iterator.next();			System.out.println(user.getName()+" , "+user.getGender());		}		//关闭SqlSession		sqlSession.close();	}		@Test	public void testStudent() {
   		//获取SqlSession		SqlSession sqlSession=getSqlSessionFactory().openSession();		//利用SqlSession得到Mapper		StudentMapper studentMapper = sqlSession.getMapper(StudentMapper.class);		Student student = studentMapper.selectByPrimaryKey(1);		System.out.println(student.getName()+" , "+student.getGender());		//关闭SqlSession		sqlSession.close();	}}
    
   

测试结果如下：

附图

在此，附上整个项目的结构图，图示如下：

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