Spring Boot實現簡單的增刪改查
在pom.xml添加相應的依賴
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <exclusions><exclusion> <groupId>org.junit.vintage</groupId> <artifactId>junit-vintage-engine</artifactId></exclusion> </exclusions> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.1.3</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- 前端使用thymeleaf來代替jsp --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> </dependencies>
配置文件配置數據庫等
#server server.port=80 #項目名：server.servlet.context-path #spring dataSource spring.datasource.url=jdbc:mysql:///dbgoods?serverTimezone=GMT%2B8&characterEncoding=utf8 spring.datasource.username=root spring.datasource.password=root mybatis.mapper-locations=classpath:/mapper/*/*.xml #spring log logging.level.com.cy=debug #spring thymeleaf（假如沒有配置也會默認配置，在默認配置中prefix默認值為classpath:/templates/,后綴默認為.html） #不用重啟服務器，網頁就能刷新 spring.thymeleaf.cache=false spring.thymeleaf.prefix=classpath:/templates/pages/ spring.thymeleaf.suffix=.html
數據層添加相應注解實現sql語句（或者通過xml配置來實現）
數據層封裝了商品信息，并提供get和set方法，為Goods類
1.查詢所有數據
@Select('select * from tb_goods') List<Goods> findAll();
2.按照id刪除數據
@Delete('delete from tb_goods where id=#{id}') int deleteById(Integer id);
3.修改數據
（1）修改數據首先要新建一個界面，按照id查找內容，并將查找到的內容顯示到文本框內
@Select('select * from tb_goods where id=#{id}') Goods findById(Integer id);
（2）再添加查找的方法
@Update('update tb_goods set name=#{name},remark=# {remark},createdTime=now() where id=#{id}') int update(Goods goods);
4.新增數據
@Insert('insert into tb_goods(name,remark,createdTime) values (#{name},#{remark},now())') int add(Goods goods);
業務層提供對應接口方法和實現類
1.業務層接口
public interface GoodsService { List<Goods> findObject(); int add(Goods goods); int update(Goods goods); Goods findById(Integer id);}
2.業務層實現類
@Servicepublic class GoodsServiceImpl implements GoodsService { @Autowired private GoodsDao goodsDao; @Override public List<Goods> findObject() { long start=System.currentTimeMillis(); List<Goods> list = goodsDao.findObjects(); long end=System.currentTimeMillis(); System.out.println('query time:'+(end-start)); return list; } @Override public int add(Goods goods) { return goodsDao.add(goods); } @Override public int update(Goods goods) { return goodsDao.update(goods); } @Override public Goods findById(Integer id) { return goodsDao.findById(id); }
控制層寫具體實現
1.跳轉到首頁并且查找所有商品
@RequestMapping('doGoodsUI') public String doGoodsUI(Model model) { List<Goods> list = goodsService.findObject(); model.addAttribute('goods',list); return 'goods'; }
2.業務層實現類
@Servicepublic class GoodsServiceImpl implements GoodsService { @Autowired private GoodsDao goodsDao; @Override public List<Goods> findObject() { long start=System.currentTimeMillis(); List<Goods> list = goodsDao.findObjects(); long end=System.currentTimeMillis(); System.out.println('query time:'+(end-start)); return list; } @Override public int add(Goods goods) { return goodsDao.add(goods); } @Override public int update(Goods goods) { return goodsDao.update(goods); } @Override public Goods findById(Integer id) { return goodsDao.findById(id); }
控制層寫具體實現
1.跳轉到首頁并且查找所有商品
@RequestMapping('doGoodsUI') public String doGoodsUI(Model model) { List<Goods> list = goodsService.findObject(); model.addAttribute('goods',list); return 'goods'; }
2.刪除商品
@RequestMapping('doDeleteById/{id}')// (@PathVariable Integer id)告訴服務器，id拿到的是從網頁上同樣叫id的數據 public String dodeletebyId(@PathVariable Integer id){ int delete = goodsDao.deleteById(id); //doGoodsUI前面沒有加/的話，跳轉的網址是替代了最后一個/后面的內容 return 'redirect:/goods/doGoodsUI'; }
3.修改商品
（1）先將查找出來的商品顯示在文本框中
@RequestMapping('doFindById/{id}') public String doFindByID(@PathVariable Integer id,Model model){ Goods goods = goodsService.findById(id); model.addAttribute('goods',goods); return 'goods-update'; }
（2）實現修改
@RequestMapping('doUpdateGoods') public String doUpdateGoods(Goods goods){ goodsService.update(goods); return 'redirect:/goods/doGoodsUI'; }
4.新增商品
@RequestMapping('doSaveGoods') public String doSaveGoods(Goods goods){ goodsService.add(goods); return 'redirect:/goods/doGoodsUI'; }
前端采用html+thymeleaf模板代替jsp
1.thymeleaf的語法參考： https://www.thymeleaf.org/doc/tutorials/3.0/usingthymeleaf.html#link-urls
2.each表示遍歷拿到的數組，goods是從控制層拿到的model的名字
3.id，name和remark與數據庫對應，date要格式化拿到數據，該語法是thymeleaf固定寫法
<tr th:each='g:${goods}'> <td th:text='${g.id}'>1</td> <td th:text='${g.name}'>AAAAAAA</td> <td th:text='${g.remark}'>aa</td> <td th:text='${#dates.format(g.createdTime,’yyyy-MM-dd HH:mm’)}'>aa</td><!-- <td><a href='http://www.b3g6.com/bcjs/6118.html#' rel='external nofollow' rel='external nofollow' rel='external nofollow' th:href='http://www.b3g6.com/bcjs/@{/goods/doDeleteById(id=${g.id})}' rel='external nofollow' ><button>刪除</button></a></td>--> <td><a href='http://www.b3g6.com/bcjs/6118.html#' rel='external nofollow' rel='external nofollow' rel='external nofollow' th:href='http://www.b3g6.com/bcjs/@{/goods/doDeleteById/{doDeleteById}(doDeleteById=${g.id})}' rel='external nofollow' ><button>刪除</button></a></td> <td><a href='http://www.b3g6.com/bcjs/6118.html#' rel='external nofollow' rel='external nofollow' rel='external nofollow' th:href='http://www.b3g6.com/bcjs/@{/goods/doFindById/{id}(id=${g.id})}' rel='external nofollow' ><button>修改</button></a></td></tr>
4.新增商品界面
（1）標簽里的name屬性要和sql語句一致
（2）這里由于數據庫中的id列設置了自增長，所以不需要id屬性，createdTime列使用了now()獲取當前時間，所以也不需要傳值，所以在控制層的doUpdateGoods方法里可以使用封裝好的Goods來接收從html拿到的參數
<form th:action='@{/goods/doSaveGoods}' method='post'> <ul> <li>name:<input type='text' name='name'></li> <li>remark:<textarea rows='3' cols='20' name='remark'></textarea></li> <li><input type='submit' value='Save Goods'></li> </ul></form>
5.修改商品界面
（1）因為id列自增長，所以修改商品信息不需要id這一列，但傳參數有需要一起傳送過去，所以添加了一個輸入框，默認設置為隱藏，將其value設置為id的值
<form th:action='@{/goods/doUpdateGoods}' method='post'> <input type='hidden' name='id' th:value='${goods.id}'> <ul> <li>name:<input type='text' name='name' th:value='${goods.name}'></li> <li>remark:<textarea rows='3' cols='20' name='remark' th:text='${goods.remark}'></textarea></li> <li><input type='submit' value='Update Goods'></li> </ul></form>
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