SQLite間距錯誤

Question

我正在創建一個SQLite。我添加了所有前四列，但添加了第五列「productadd」時。它找不到。以下代碼有什麼問題？

db.execSQL("CREATE TABLE if not exists producttable(id INTEGER PRIMARY KEY AUTOINCREMENT," 
       + " productidno" 
       + " TEXT ," 
       + " productname" 
       + " TEXT," 
       + " productprice" 
       + " TEXT," 
       + " productdest" 
       + " TEXT," 
       + " productadd" 
       +" TEXT)"); 

Answer 1

如果表是用4列創建的CREATE TABLE if not exist將不添加額外的列，爲了增加你不得不說ALTER TABLE producttable ADD productadd TEXT列。