這可能是我的SQLite「選擇器」定義愚蠢的錯誤,但似乎無法從類似的問題併發布至今的錯誤。我可能犯了一個愚蠢的錯誤,但不能在我的生活中找到它。請讓我知道,如果你需要更多的信息能夠幫助!SQLite光標查詢錯誤「喜歡」和「==」不工作在內容提供者「選擇」定義
所以這個工作得很好:
selection = "((" +
TransContract.TransEntry.COLUMN_DATE + " > " +
Long.toString(dateOutput) + ") AND (" +
TransContract.TransEntry.COLUMN_DATE + " <= " + Long.toString(dateOutputEnd) + "))";
但是,當我嘗試查詢COLUMN_CATEGORY(這是文本格式),以這樣的方式
selection = TransContract.TransEntry.COLUMN_CATEGORY + " like " + '%'+
"Transport General" + "%";
或者這樣說:
selection = TransContract.TransEntry.COLUMN_CATEGORY + " == " +
"Transport General";
我收到「E/AndroidRuntime:致命例外」
我的遊標查詢:
cursor = database.query(
TransContract.TransEntry.TABLE_NAME,
projection,
selection,
selectionArgs,
null,
null,
sortOrder);
我DbHelper(其中類別欄找到):
String SQL_CREATE_ENTRIES =
"CREATE TABLE " + TransContract.TransEntry.TABLE_NAME + " (" +
TransContract.TransEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
TransContract.TransEntry.COLUMN_AMOUNT + " REAL, " +
TransContract.TransEntry.COLUMN_TYPE + " INTEGER NOT NULL DEFAULT 0, " + // debit, credit
TransContract.TransEntry.COLUMN_ACCOUNT + " INTEGER, " + // wallet, savings, more later.
TransContract.TransEntry.COLUMN_ACCOUNT_FROM + " INTEGER, " + // defaults from wallet 0
TransContract.TransEntry.COLUMN_ACCOUNT_TO + " INTEGER, " + // defaults back to wallet 0
TransContract.TransEntry.COLUMN_CATEGORY + " TEXT, " +
TransContract.TransEntry.COLUMN_TITLE + " TEXT, " +
TransContract.TransEntry.COLUMN_DATE + " INTEGER, " +
TransContract.TransEntry.COLUMN_RECURRING + " INTEGER NOT NULL DEFAULT 0," +
TransContract.TransEntry.COLUMN_FREQUENCY + " TEXT," +
TransContract.TransEntry.COLUMN_END_DATE + " INTEGER" +
");";
編輯
謝謝您的意見,我本來應該更具體的!我的堆棧跟蹤確實是一個語法錯誤,它來自我正在粘貼的新代碼行。
Caused by: android.database.sqlite.SQLiteException: near "General": syntax error (code 1): , while compiling: SELECT _id, category, title, amount, type, date FROM transactions WHERE category == Transport General ORDER BY date DESC
的問題是對於字符串(感謝@Ton Plooij),但奇怪的比較值並不需要單引號雙引號內的單引號。
這裏是工作的解決方案:
selection = TransContract.TransEntry.COLUMN_CATEGORY + " = " +
"'Transport General'";