startdate和enddate可空值更新

alien-entity/src/main/java/shop/alien/entity/store/LifeDiscountCoupon.java

@@ -50,11 +50,11 @@ public class LifeDiscountCoupon extends Model<LifeDiscountCoupon> {
     private Integer expirationDate;
 
     @ApiModelProperty(value = "开始日期")
-    @TableField("start_date")
+    @TableField(value = "start_date", updateStrategy = FieldStrategy.IGNORED)
     private LocalDate startDate;
 
     @ApiModelProperty(value = "结束日期")
-    @TableField("end_date")
+    @TableField(value = "end_date", updateStrategy = FieldStrategy.IGNORED)
     private LocalDate endDate;
 
     @ApiModelProperty(value = "库存（优惠券数量）")