@DynamicUpdate //自动更新updatetime的问题

@Entity
@DynamicUpdate  //自动更新（动态更新）updatetime
public class ProductCategory {
 /*类目Id*/
    @Id              //主键
    @GeneratedValue(strategy = GenerationType.IDENTITY) //子增类型
    private Integer categoryId;
    /*类目名字*/
    private String categoryName;
    /*类目编号*/
    private Integer categoryType;
 
    /*创建时间*/
    private Date createTime;
    /*更新时间*/
    private Date updateTime;
 
 
    public Integer getCategoryId(int i) {
        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;
    }
 
    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;
    }
 
    @Override
    public String toString() {
        return "ProductCategory{" +
                "categoryId=" + categoryId +
                ", categoryName='" + categoryName + '\'' +
                ", categoryType=" + categoryType +
                '}';
    }
 
}