SQLite更新后触发重命名相同的文件名

我正在数据库中存储一些文件信息，并通过sql生成文件名

我正在使用以下内容更新所有行：

UPDATE contacts_New SET PhotoName=PersonName||'_'|| Date

问题是，我想重命名重复项，如：

    Person1_Date -> Person1_Date
    ........
    Person2_Date -> Person2_Date
    Person2_Date -> Person2_Date-2
    Person2_Date -> Person2_Date-3
    Person2_Date -> Person2_Date-4
    ........
    Person10_Date -> Person10_Date

我尝试使用更新触发器执行此操作：

CREATE TRIGGER ReNamePhotoNames UPDATE OF PhotoName ON contacts_New for each row
  BEGIN
    UPDATE contacts_New SET PhotoName=PhotoName || '-' || (SELECT count(*)+1 from contacts_New where PhotoName=new.PhotoName) WHERE (PhotoName=new.PhotoName);
  END;

结果:

Person1_Date -> Person1_Date
........
Person2_Date -> Person2_Date
Person2_Date -> Person2_Date-2
Person2_Date -> Person2_Date-2
Person2_Date -> Person2_Date-2
........
Person10_Date -> Person10_Date

我怎样才能解决这个问题

多谢各位

我解决了这个问题：

            DROP TRIGGER IF exists ReNamePhotoNames;
            CREATE TRIGGER ReNamePhotoNames AFTER UPDATE OF PhotoName ON contacts_New for each row
              BEGIN
                UPDATE contacts_New SET PhotoName =
                    new.PhotoName || 
                    CASE WHEN 
                        (SELECT count(*) from contacts_New where (PhotoName LIKE new.PhotoName ||'%')) > 1 
                    THEN 
                        (SELECT count(*) from contacts_New where (PhotoName LIKE new.PhotoName ||'%')) 
                    ELSE '' END || '.jpg'
                WHERE ((PhotoName LIKE new.PhotoName) AND (IFNULL(PhotoCreated,'') IS NOT ''));
              END;