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">
userId="root" password="root">
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
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%");
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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");
}
}
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