在pom.xml添加相应的依赖
<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来代替jsp -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
</dependencies>
配置文件配置数据库等
#server server.port=80 #项目名：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（假如没有配置也会默认配置，在默认配置中prefix默认值为classpath:/templates/,后缀默认为.html） #不用重启服务器，网页就能刷新 spring.thymeleaf.cache=false spring.thymeleaf.prefix=classpath:/templates/pages/ spring.thymeleaf.suffix=.html
数据层添加相应注解实现sql语句（或者通过xml配置来实现）
数据层封装了商品信息，并提供get和set方法，为Goods类
1.查询所有数据
@Select("select * from tb_goods")
List<Goods> findAll();
2.按照id删除数据
@Delete("delete from tb_goods where id=#{id}")
int deleteById(Integer id);
3.修改数据
（1）修改数据首先要新建一个界面，按照id查找内容，并将查找到的内容显示到文本框内
@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.新增数据
@Insert("insert into tb_goods(name,remark,createdTime) values (#{name},#{remark},now())")
int add(Goods goods);
业务层提供对应接口方法和实现类
1.业务层接口
public interface GoodsService {
List<Goods> findObject();
int add(Goods goods);
int update(Goods goods);
Goods findById(Integer id);
}
2.业务层实现类
@Service
public 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);
}
控制层写具体实现
1.跳转到首页并且查找所有商品
@RequestMapping("doGoodsUI")
public String doGoodsUI(Model model) {
List<Goods> list = goodsService.findObject();
model.addAttribute("goods",list);
return "goods";
}
2.业务层实现类
@Service
public 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);
}
控制层写具体实现
1.跳转到首页并且查找所有商品
@RequestMapping("doGoodsUI")
public String doGoodsUI(Model model) {
List<Goods> list = goodsService.findObject();
model.addAttribute("goods",list);
return "goods";
}
2.删除商品
@RequestMapping("doDeleteById/{id}")
// (@PathVariable Integer id)告诉服务器，id拿到的是从网页上同样叫id的数据
public String dodeletebyId(@PathVariable Integer id){
int delete = goodsDao.deleteById(id);
//doGoodsUI前面没有加/的话，跳转的网址是替代了最后一个/后面的内容
return "redirect:/goods/doGoodsUI";
}
3.修改商品
（1）先将查找出来的商品显示在文本框中
@RequestMapping("doFindById/{id}")
public String doFindByID(@PathVariable Integer id,Model model){
Goods goods = goodsService.findById(id);
model.addAttribute("goods",goods);
return "goods-update";
}
（2）实现修改
@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的语法参考： https://www.thymeleaf.org/doc/tutorials/3.0/usingthymeleaf.html#link-urls
2.each表示遍历拿到的数组，goods是从控制层拿到的model的名字
3.id，name和remark与数据库对应，date要格式化拿到数据，该语法是thymeleaf固定写法
<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="${#dates.format(g.createdTime,'yyyy-MM-dd HH:mm')}">aa</td>
<!-- <td><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" th:href="@{/goods/doDeleteById(id=${g.id})}" rel="external nofollow" ><button>删除</button></a></td>-->
<td><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" th:href="@{/goods/doDeleteById/{doDeleteById}(doDeleteById=${g.id})}" rel="external nofollow" ><button>删除</button></a></td>
<td><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" th:href="@{/goods/doFindById/{id}(id=${g.id})}" rel="external nofollow" ><button>修改</button></a></td>
</tr>
4.新增商品界面
（1）标签里的name属性要和sql语句一致
（2）这里由于数据库中的id列设置了自增长，所以不需要id属性，createdTime列使用了now()获取当前时间，所以也不需要传值，所以在控制层的doUpdateGoods方法里可以使用封装好的Goods来接收从html拿到的参数
<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）因为id列自增长，所以修改商品信息不需要id这一列，但传参数有需要一起传送过去，所以添加了一个输入框，默认设置为隐藏，将其value设置为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>
以上就是Spring Boot实现简单的增删改查的详细内容，更多关于Spring Boot增删改查的资料请关注脚本之家其它相关文章！
