MyBatis入门（七）---逆向工程-java教程-PHP中文网

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MyBatis入门（七）---逆向工程

黄舟

Dec 21, 2016 pm 02:37 PM

一、逆向工程

1.1、概述

mybatis需要程序号自己编写的SQL。

mybatis官方提供了逆向工程，可以针对单表自动生成mybatis执行所需要的代码

（mapper,java,maper.xml,po...)

一般都是由数据库到java代码，的生成过程

二、导入jar包

2.1、mybatis-generator

三、配置xml

3.1、generatorConfig.xml

PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

connectionURL="jdbc:mysql://localhost:3306/mybatis?character=utf8"
userId="root" password="root">

targetProject=".\src">

targetProject=".\src">

targetPackage="com.pb.mybatis.mapper" targetProject=".\src">

四、运行java程序生成

4.1、java程序

import java.io.File;import java.io.IOException;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.exception.XMLParserException;import org.mybatis.generator.internal.DefaultShellCallback;public class GeneratorSqlmap { public void generator() throws Exception{

List warnings = new ArrayList(); boolean overwrite = true; //指定逆向工程配置文件
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);

}
public static void main(String[] args) throws Exception { try {
GeneratorSqlmap generatorSqlmap = new GeneratorSqlmap();
generatorSqlmap.generator();
} catch (Exception e) {
e.printStackTrace();
}

}

五、测试

5.1、测试类

package com.pb.ssm.mapper;import static org.junit.Assert.fail;import java.util.Date;import java.util.List;import javax.crypto.Cipher;import org.junit.Before;import org.junit.Test;import org.springframework.context.applicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.pb.ssm.po.Author;import com.pb.ssm.po.AuthorExample;import com.pb.ssm.po.AuthorExample.Criteria;public class AuthorMapperTest { private ApplicationContext applicationContext; private AuthorMapper authorMapper;

@Before public void setUp() throws Exception {
applicationContext=new ClassPathXmlApplicationContext("ApplicationContext.xml");
authorMapper=(AuthorMapper) applicationContext.getBean("authorMapper");
}
//根据条件查询记录数 @Test public void testCountByExample() {
AuthorExample example=new AuthorExample(); //可以加条件，不加条件默认查询全部
Criteria criteria=example.createCriteria(); //加条件，介绍不是空的 criteria.andAuthorBioIsNotNull(); int num=authorMapper.countByExample(example);
System.out.println("num="+num);
}
//根据条件删除 @Test public void testDeleteByExample() {
AuthorExample example=new AuthorExample(); //可以加条件，不加条件默认查询全部
Criteria criteria=example.createCriteria();
criteria.andAuthorUsernameEqualTo("程序员"); int num=authorMapper.deleteByExample(example);
System.out.println("num="+num);

}
//根据主键ID删除 @Test public void testDeleteByPrimaryKey() { int num=authorMapper.deleteByPrimaryKey(18);
System.out.println("num="+num);
} //插入 @Test public void testInsert() {

Author author=new Author();
author.setAuthorUsername("再测试一下");
author.setAuthorPassword("admin123");
author.setAuthorEmail("admin1234@QQ.com");

int num=authorMapper.insert(author);
System.out.println("num="+num); //这个方法插入，默认不会把数据库自增加ID返回，如果需要，可以手动增加
System.out.println("插入后的ID"+author.getAuthorId());

} //插入 @Test public void testInsertSelective() {
Author author=new Author();
author.setAuthorUsername("再测试一下");
author.setAuthorPassword("admin123");
author.setAuthorEmail("admin1234@qq.com");
author.setRegisterTime(new Date());

int num=authorMapper.insert(author);
System.out.println("num="+num); //这个方法插入，默认不会把数据库自增加ID返回，如果需要，可以手动增加
System.out.println("插入后的ID"+author.getAuthorId());

} //自定义条件查询 @Test public void testSelectByExample() { //声明一个对象
AuthorExample authorExample=new AuthorExample(); //创建criteria对象添加条件 and 连接
Criteria criteria=authorExample.createCriteria(); //需要手动加%
criteria.andAuthorUsernameLike("%张三%");

List list=authorMapper.selectByExample(authorExample);
System.out.println(list.size());
}
//根据主键ID查询 @Test public void testSelectByPrimaryKey() {
Author author= authorMapper.selectByPrimaryKey(6);
System.out.println(author.getAuthorUsername()+"..."+author.getAuthorBio());
}

@Test public void testUpdateByExampleSelective() {
fail("Not yet implemented");
}

@Test public void testUpdateByExample() {
fail("Not yet implemented");
}

@Test public void testUpdateByPrimaryKeySelective() {
fail("Not yet implemented");
}

@Test public void testUpdateByPrimaryKey() {
fail("Not yet implemented");
}

}