springboot创建项目编写dao serviece 和controller

骑猪看日落 2021-12-16 06:05 176阅读 0赞

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package com.imooc.dataobject;
    
    //import javax.persistence.Table;
    
    import lombok.Data;
    import org.hibernate.annotations.DynamicUpdate;
    
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    import javax.persistence.Table;
    import java.util.Date;
    
    /**
     * Created by Administrator on 2019/3/5 0005.
     *   现在表名称是 product_category  刚好默认对应
     *   如果是 db_product_category
     */
    //@Table(name = "db_product_category")   这就要写
    @Table(name = "product_category") //  表名一致    这行是可以不写的  下划线直接转成驼峰
    @Entity   //  数据库映射为对象  必须加这个注解
    @DynamicUpdate   //update_time字段  自动更新
    @Data  //不用写get set  toString 都有了 了
    public class ProductCategory {
    
        //    数据库的下划线修改为驼峰   类目id
        @Id//主键
        @GeneratedValue//自增类型
        private Integer categoryId;//变量和表名一样  下划线修改驼峰
    
        /*   类目名字  */
        private String categoryName;
    
        /*   类目编号  */
        private Integer categoryType;
    
    
        //  不知道为什么增加这2个属性  就无法正常更新时间了
        private Date createTime;   //先不增加  用得到了在增加
    
        private Date updateTime;
    
    
    
        //pom文件中做一下修改就不用每次生成get  set  toString了
        //1.pom文件中增加<groupId>org.projectlombok</groupId>
        //2.安装插件  setting-》plugin  lombok plugin
        //3.实体类开头增加注释@Data  爆红色  就需要刷新pom文件
    
    
    //    public Date getCreateTime() {
    //        return createTime;
    //    }
    //
    //    public void setCreateTime(Date createTime) {
    //        this.createTime = createTime;
    //    }
    //
    //    public Date getUpdateTime() {
    //        return updateTime;
    //    }
    //
    //    public void setUpdateTime(Date updateTime) {
    //        this.updateTime = updateTime;
    //    }
    //
    //
    //    //    get  set
    //
    //
    //    public Integer getCategoryId() {
    //        return categoryId;
    //    }
    //
    //    public void setCategoryId(Integer categoryId) {
    //        this.categoryId = categoryId;
    //    }
    //
    //    public String getCategoryName() {
    //        return categoryName;
    //    }
    //
    //    public void setCategoryName(String categoryName) {
    //        this.categoryName = categoryName;
    //    }
    //
    //    public Integer getCategoryType() {
    //        return categoryType;
    //    }
    //
    //    public void setCategoryType(Integer categoryType) {
    //        this.categoryType = categoryType;
    //    }
    
    
    //    @Override
    //    public String toString() {
    //        return "ProductCategory{" +
    //                "categoryId=" + categoryId +
    //                ", categoryName='" + categoryName + '\'' +
    //                ", categoryType=" + categoryType +
    //
    //                '}';
    //    }
    }

repository  就是dao

package com.imooc.repository;
    
    import com.imooc.dataobject.ProductCategory;
    import org.springframework.data.jpa.repository.JpaRepository;
    
    import java.util.List;
    
    /**
     * Created by Administrator on 2019/3/5 0005.
     *       类名有点长别写错了     不知道为什么老是强调这个 ....
     */
    //  这里是interface 不是class    spring的Jpa我以前有讲过  springJpa有一个在慕课网上有自己看吧
    public interface ProductCategoryRepository  extends JpaRepository<ProductCategory,Integer> {
    //选中接口->GoTo->Test->选中ok     这样就可以进行单元测试了
    
    
        //默认存在的方法是无法满足需求的   需要自定义一些方法           //这个是categoryType   不是categoryId!!!!!!
        List<ProductCategory> findByCategoryTypeIn(List<Integer> categoryTypeList);//根据传入的categroyTypeList查询出类目list
        //findBy  有提示的   CategoryTypeIn  有提示的  拆成多个就有提示了
        //List<ProductCategory> findByCategoryTypeInAndCategoryName();
    
    }

findOne

save   保存和更新都是这个方法

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