java - Sqlite 更新操作我可以添加值现有值吗？

Question

"UPDATE " + DatabaseFıelds.TABLE_NAME + 
" SET " + DatabaseFıelds.SUBJECT_PROGRESS + " = " + 
point + " WHERE " + DatabaseFıelds.SUBJECT_ID + " = " + id; 

此查询更新我的值，但我希望它添加到现有值。我该如何解决这个问题？

Answer 1

我猜您想将 point 的值添加到 DatabaseFields.SUBJECT_PROGRESS 的现有值，对吗？你可以这样做:

"UPDATE " + DatabaseFıelds.TABLE_NAME + 
" SET " + DatabaseFıelds.SUBJECT_PROGRESS + " = "  + 
DatabaseFıelds.SUBJECT_PROGRESS + " + " + point + 
" WHERE " + DatabaseFıelds.SUBJECT_ID + " = " + id;