【fix-字段为null不更新】

src/main/java/com/zzsn/event/vo/SubjectKeywordsMap.java

 package com.zzsn.event.vo;
 
+import com.baomidou.mybatisplus.annotation.FieldStrategy;
+import com.baomidou.mybatisplus.annotation.TableField;
 import com.baomidou.mybatisplus.annotation.TableName;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
@@ -38,6 +40,8 @@ public class SubjectKeywordsMap implements Serializable {
     /**是否启用元搜索 1启用，0不启用*/
     private Integer metaSearchFlag;
     /**需要命中的关键词的笛卡尔积数量*/
+    //字段为空时，也更新数据库
+    @TableField(updateStrategy = FieldStrategy.IGNORED)
     private Integer cartesianNum;
 
 }