SpringBoot学习之旅（三）快速修改数据库记录及事务配置

在之前的基础上新增修改表book的introduction字段的方法

package lang.java.springbootdemo.dao;

import lang.java.springbootdemo.entity.Book;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface BookDao {
    List getBookByWriter(String writer);
    int updateIntroductionById(int id, String introduction);
}

package lang.java.springbootdemo.service;

import lang.java.springbootdemo.entity.Book;

import java.util.List;

public interface BookService {
    List getBookByWriter(String writer);
    int updateIntroductionById(int id, String introduction);
}

package lang.java.springbootdemo.service.impl;

import lang.java.springbootdemo.dao.BookDao;
import lang.java.springbootdemo.entity.Book;
import lang.java.springbootdemo.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class BookServiceImpl implements BookService {
    @Autowired
    BookDao bookDao;

    @Override
    public List getBookByWriter(String writer) {
        return bookDao.getBookByWriter(writer);
    }

    @Override
    public int updateIntroductionById(int id, String introduction){
        return  bookDao.updateIntroductionById(id, introduction);
    }
}

package lang.java.springbootdemo.controller;

import lang.java.springbootdemo.entity.Book;
import lang.java.springbootdemo.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@RestController
@EnableAutoConfiguration
public class BookController {
    @Autowired
    BookService bookService;

    @RequestMapping("/listBooks")
    String listBooks(HttpServletRequest request, HttpServletResponse response) {
        StringBuilder s = new StringBuilder();
        for (Book book : bookService.getBookByWriter(request.getParameter("writer"))) {
            s.append(book.getName()).append(";");
        }
        return s.toString();
    }

    @RequestMapping("/updateIntroductionById")
    int updateIntroductionById(HttpServletRequest request, HttpServletResponse response) {
        StringBuilder s = new StringBuilder();
        for (Book book : bookService.getBookByWriter(request.getParameter("writer"))) {
            s.append(book.getName()).append(";");
        }
        return bookService.updateIntroductionById(Integer.parseInt(request.getParameter("id")), request.getParameter("introduction"));
    }
}

 

实测可以修改记录，但这时还不支持事务，修改代码，虽然方法内部报错，但是修改依然有效！

package lang.java.springbootdemo.service.impl;

import lang.java.springbootdemo.dao.BookDao;
import lang.java.springbootdemo.entity.Book;
import lang.java.springbootdemo.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class BookServiceImpl implements BookService {
    @Autowired
    BookDao bookDao;

    @Override
    public List getBookByWriter(String writer) {
        return bookDao.getBookByWriter(writer);
    }

    @Override
    public int updateIntroductionById(int id, String introduction){
        int i =  bookDao.updateIntroductionById(id, introduction);
        i=1/0;
        return i;
    }
}

开启事务支持，只需要在对应的方法上添加一行注解，再次测试，记录修改失败，证明事务配置生效。

package lang.java.springbootdemo.service.impl;

import lang.java.springbootdemo.dao.BookDao;
import lang.java.springbootdemo.entity.Book;
import lang.java.springbootdemo.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
public class BookServiceImpl implements BookService {
    @Autowired
    BookDao bookDao;

    @Override
    public List getBookByWriter(String writer) {
        return bookDao.getBookByWriter(writer);
    }

    @Override
    @Transactional(propagation = Propagation.REQUIRED, isolation = Isolation.DEFAULT)
    public int updateIntroductionById(int id, String introduction){
        int i =  bookDao.updateIntroductionById(id, introduction);
        i=1/0;
        return i;
    }
}