这可能是我的SQLite“选择器”定义愚蠢的错误,但似乎无法从类似的问题并发布至今的错误。我可能犯了一个愚蠢的错误,但不能在我的生活中找到它。请让我知道,如果你需要更多的信息能够帮助!SQLite光标查询错误“喜欢”和“==”不工作在内容提供者“选择”定义
所以这个工作得很好:
selection = "((" +
TransContract.TransEntry.COLUMN_DATE + " > " +
Long.toString(dateOutput) + ") AND (" +
TransContract.TransEntry.COLUMN_DATE + " <= " + Long.toString(dateOutputEnd) + "))";
但是,当我尝试查询COLUMN_CATEGORY(这是文本格式),以这样的方式
selection = TransContract.TransEntry.COLUMN_CATEGORY + " like " + '%'+
"Transport General" + "%";
或者这样说:
selection = TransContract.TransEntry.COLUMN_CATEGORY + " == " +
"Transport General";
我收到“E/AndroidRuntime:致命例外”
我的游标查询:
cursor = database.query(
TransContract.TransEntry.TABLE_NAME,
projection,
selection,
selectionArgs,
null,
null,
sortOrder);
我DbHelper(其中类别栏找到):
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" +
");";
编辑
谢谢您的意见,我本来应该更具体的!我的堆栈跟踪确实是一个语法错误,它来自我正在粘贴的新代码行。
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
的问题是对于字符串(感谢@Ton Plooij),但奇怪的比较值并不需要单引号双引号内的单引号。
这里是工作的解决方案:
selection = TransContract.TransEntry.COLUMN_CATEGORY + " = " +
"'Transport General'";