트랜젝션 처리하기(연관된 일련의 작업이 실행도중 실패하면 그전 성공했던 작업을 취소하는 작업)

DemoController.java

package com.sp.demo;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

@Controller("demo.demoController")

public class DemoController {

@Autowired

private DemoService service;

@RequestMapping(value="/demo/write", method=RequestMethod.GET)

public String form(){

return "demo/write";

}

@RequestMapping(value="/demo/write", method=RequestMethod.POST)

public String submit(HttpServletRequest req, Demo demo){

String msg="추가 성공";

try{

service.insertDemo(demo);

}catch(Exception e){

System.out.println(e.toString());

msg="추가 실패.";

}

req.setAttribute("message", msg);

return "demo/write_ok";

}

}

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DemoService.java

package com.sp.demo;

public interface DemoService {

public int insertDemo(Demo demo) throws Exception;

}

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DemoServiceImpl.java

package com.sp.demo;

import org.springframework.transaction.annotation.Propagation;

import org.springframework.transaction.annotation.Transactional;

@Transactional(readOnly=true)

public class DemoServiceImpl implements DemoService {

private DemoDAO demoDao;

public void setDemoDao(DemoDAO demoDao){

this.demoDao = demoDao;

}

@Override

@Transactional(propagation=Propagation.REQUIRED, rollbackFor={Exception.class}) // 롤백처리하는 어노테이션

public int insertDemo(Demo demo)  throws Exception{ // 오버라이드 할때는 예외를 뺄순 있어도 추가할수는 없다. 쓰려면 interface를 수정해야한다.

int result=0;

try{

demoDao.insertDemo(demo);

result=1;

}catch(Exception e){

throw e;

}

return result;

}

}

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Demo.java

package com.sp.demo;

public class Demo {

private String name,birth,tel;

private int id;

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getBirth() {

return birth;

}

public void setBirth(String birth) {

this.birth = birth;

}

public String getTel() {

return tel;

}

public void setTel(String tel) {

this.tel = tel;

}

}

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DemoDAO.java

package com.sp.demo;

import org.apache.ibatis.session.SqlSession;

import org.mybatis.spring.support.SqlSessionDaoSupport;

public class DemoDAO extends SqlSessionDaoSupport {

public void insertDemo(Demo demo) throws Exception{

try{

SqlSession sqlSession=getSqlSession();

sqlSession.insert("demo.insertDemo1",demo);

sqlSession.insert("demo.insertDemo2",demo);

sqlSession.insert("demo.insertDemo3",demo);

}catch(Exception e){

throw e;

}

}

}

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