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README
Apache-2.0

License JDK 1.8 Maven Central

Mybatis-proxy项目简介

Mybatis本身并不是为Spring环境而生,但Spring对mybatis得调用做了很好得封装,通过Spring,我们可以方便调用Mapper进行CRUD操作。

然而,我们也可能面临这种情况: 我们的项目无法使用Spring,或者没必要使用。这时,我们将怎样操作数据库呢?

对,我们可以通过JDBC操作数据库。也可以用Mybatis拿到SqlSession去操作数据库。

Mybatis-proxy就是为了简化非Spring环境下Mybatis的使用。通过一次调用并搭配注解实现有/无事务的Mybatis操作。

Gitee

Github

Get Started

主要功能

  1. 快速启动。
  2. 支持注解式事务。
  3. 使用配置文件初始化配置。

使用说明

jar包已经上传到maven中央仓库。 https://search.maven.org/search?q=mybatis-proxy ,groupId为cn.pomit。

使用文档地址

maven依赖

<dependency>
	<groupId>cn.pomit</groupId>
	<artifactId>mybatis-proxy</artifactId>
	<version>1.0</version>
</dependency>

初始化

调用MybatisConfiguration.initConfiguration进行初始化,共用以下三个参数,packageName指定扫描mapper的包路径,dataSource指定数据源,这两个属性也可以不传,通过properties配置文件传递。

如果没有properties配置文件,packageName和dataSource必须传。

MybatisConfiguration.initConfiguration(packageName, dataSource, properties);

properties配置文件配置要求:

#mybatis.mapper.scan=cn.pomit.alarm.mapper
mybatis.transation.scan=cn.pomit.alarm.service
mybatis.datasource.type=POOLED
mybatis.datasource.driver=com.mysql.jdbc.Driver
mybatis.datasource.url=jdbc:mysql://127.0.0.1:3306/boot?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC
mybatis.datasource.username=cff
mybatis.datasource.password=123456

mybatis.mapper.scan指定了扫描mapper的包路径,如果包路径传递了,该配置无效。

mybatis.datasource.type指定了数据源类型。

mybatis.datasource.xxx顾名思义,就是配置mybatis数据源的,和mybatis要求得参数是对应的,如果传递了数据源,该配置无效。

使用方法

Mapper写法

实体、Mapper和xml等写法就是Mybatis原生写法。

Mapper可以使用注解的方式写sql。

如果要用xml方式写sql,要将xml文件和mapper接口放到同一个包路径下。xml文件放到classpath下无效。

mapper接口一定要放到包扫描路径下。

调用方法

业务逻辑调用Mapper需要使用以下方式:

UserInfoMapper userInfoMapper = ProxyHandlerFactory.getMapper(UserInfoMapper.class);

示例:

import cn.pomit.alarm.domain.UserInfo;
import cn.pomit.alarm.mapper.UserInfoMapper;
import cn.pomit.mybatis.ProxyHandlerFactory;


public class UserInfoServiceImp implements UserInfoService{

	UserInfoMapper userInfoMapper = ProxyHandlerFactory.getMapper(UserInfoMapper.class);

	public UserInfo findUser(String userName) {		
		return userInfoMapper.selectByUserName(userName);
	}

	public int save(UserInfo user) throws Exception{		
		UserInfo test = userInfoMapper.selectByUserName(user.getUserName());
		System.out.println(test);
		if(test == null){
			int ret = userInfoMapper.save(user);
			System.out.println(ret);
			return ret;
		}

		return -1;
	}

}

事务处理

在主要事务支持的类上,添加@Transactional注解,该注解是cn.pomit注解,非javax注解,只能用于类上,不能在方法上使用。

添加@Transactional注解的类,不能使用new来创建对象,否则无法开启事务。

要使用如下方式调用:

UserInfoService userInfoService = ProxyHandlerFactory.getTransaction(UserInfoServiceImp.class);

因为并未使用cglib,使用jdk的动态代理,所以@Transactional注解的类要实现接口。

示例: UserInfoServiceImp:

import cn.pomit.alarm.domain.UserInfo;
import cn.pomit.alarm.mapper.UserInfoMapper;
import cn.pomit.mybatis.ProxyHandlerFactory;

@Transactional
public class UserInfoServiceImp implements UserInfoService{

	UserInfoMapper userInfoMapper = ProxyHandlerFactory.getMapper(UserInfoMapper.class);

	public UserInfo findUser(String userName) {		
		return userInfoMapper.selectByUserName(userName);
	}

	public int save(UserInfo user) throws Exception{		
		UserInfo test = userInfoMapper.selectByUserName(user.getUserName());
		System.out.println(test);
		if(test == null){
			int ret = userInfoMapper.save(user);
			System.out.println(ret);
			int i = 1/0; //这里测试事务回滚
			return ret;
		}

		return -1;
	}

}

调用示例:

UserInfoService userInfoService = ProxyHandlerFactory.getTransaction(UserInfoServiceImp.class);
UserInfo user = new UserInfo();
user.setUserName("123");
user.setPasswd("345");
userInfoService.save(user);

与consul-proxy整合

mybatis-proxy本身在consul-proxy项目的开发过程中延申出来的项目,为了consul-proxy项目能够简洁地访问数据库。

因此consul-proxy项目提供了快捷使用mybatis的方式。

在引入consul-proxy和mybatis-proxy的项目中,为了避免手动初始化(MybatisConfiguration.initConfiguration),可以使用注解@EnableMybatis搭配mybatis.configuration配置开启mybatis-proxy的使用。

如:

import cn.pomit.alarm.handler.FalconAlarmHandler;
import cn.pomit.alarm.handler.GatewayAlarmHandler;
import cn.pomit.alarm.handler.UserInfoTestHandler;
import cn.pomit.consul.ConsulProxyApplication;
import cn.pomit.consul.annotation.EnableMybatis;
import cn.pomit.consul.annotation.EnableServer;

@EnableServer(handler={FalconAlarmHandler.class,GatewayAlarmHandler.class, UserInfoTestHandler.class})
@EnableMybatis(mapperScan = "cn.pomit.alarm.mapper")
public class AlarmApp {
	public static void main(String[] args) {
		ConsulProxyApplication.run(AlarmApp.class, args);
	}

}

同时,需要在配置文件中指定mybatis.configuration:

mybatis.configuration=cn.pomit.mybatis.configuration.MybatisConfiguration

结合consul-proxy的Demo项目

Gitee-Consul-proxy-test

Github-Consul-proxy-test

Mybatis-proxy的Demo项目

Gitee-Mybatis-proxy-test

Github-Mybatis-proxy-test

版权声明

mybatis-proxy使用 Apache License 2.0 协议.

作者信息

作者博客:https://blog.csdn.net/feiyangtianyao

个人网站:https://www.pomit.cn

作者邮箱: fufeixiaoyu@163.com

License

Apache License V2

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