@Entity
@DynamicUpdate
@Data
//@Table(name = "product_category")
public class ProductCategory {
    /**类目id.**/
    @Id
    @GeneratedValue
    private Integer categoryId;
    /**类目名字**/
    private String categoryName;
    /** 类目编号**/
    private Integer categoryType;
    private Date createTime;
    private Date updateTime;
}

ProductCategory productCategory =repository.findOne(2);
productCategory.setCategoryType(5);
ProductCategory result=repository.save(productCategory);