錯誤:無法創建Android的SQLite數據庫:PRAGMA錯誤
E/Database(8614): Failure 21 (out of memory) on 0x0 when preparing 'PRAGMA user_version = 1'.
E/Database(8614): Failure 21 (out of memory) on 0x0 when preparing 'ROLLBACK;'.
D/Database(8614): exception during rollback, maybe the DB previously performed an auto-rollback
D/AndroidRuntime(8614): Shutting down VM
W/dalvikvm(8614): threadid=3: thread exiting with uncaught exception (group=0x4001dc20)
E/AndroidRuntime(8614): Uncaught handler: thread main exiting due to uncaught exception
我當前的代碼:
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class Database extends SQLiteOpenHelper {
private static String DatabaseName = "Entries.db";
public Database(Context context) {
super(context, DatabaseName, null, 1);
}
public void onCreate(SQLiteDatabase D) {
D.execSQL(
"CREATE TABLE Containers ("
+ "ID INTEGER PRIMARY KEY AUTOINCREMENT,"
+ "Parent INTEGER,"
+ "Sequence INTEGER,"
+ "Name TEXT"
+ ")"
);
D.execSQL(
"CREATE TABLE Files ("
+ "ID INTEGER PRIMARY KEY AUTOINCREMENT,"
+ "Parent INTEGER,"
+ "Sequence INTEGER,"
+ "Name TEXT,"
+ "Text TEXT"
+ ")"
);
D.execSQL("INSERT INTO Containers (Parent, Sequence, Name) VALUES (0, 2, \"TestLine2\")");
D.execSQL("INSERT INTO Containers (Parent, Sequence, Name) VALUES (0, 1, \"TestLine1\")");
D.execSQL("INSERT INTO Containers (Parent, Sequence, Name) VALUES (0, 3, \"TestLine3\")");
D.execSQL("INSERT INTO Containers (Parent, Sequence, Name) VALUES (2, 1, \"TestLine2-1\")");
D.execSQL("INSERT INTO Containers (Parent, Sequence, Name) VALUES (2, 2, \"TestLine2-2\")");
D.close();
}
@Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
}
public static Cursor Query(Context context, String SQL) {
StartQuerySeries(context);
Cursor Result = Query(SQL);
StopQuerySeries();
return Result;
}
private static Database D = null;
public static void StartQuerySeries(Context context) {
D = new Database(context);
}
public static Cursor Query(String SQL) {
SQLiteDatabase X = D.getWritableDatabase();
return X.rawQuery(SQL, null);
}
public static void StopQuerySeries() {
D.close();
D = null;
}
}
時,在主要活動,這就是所謂的像這樣的錯誤發生:
Database.Query(this, "INSERT INTO Files (Parent, Sequence, Name, Text) VALUES (1, 1, \"Item1\", \"Item1 Text\")");
發生在「D.getWritableDatabase()」行
的錯誤...我能找到最接近的是,在http://www.sqlite.org/c3ref/c_abort.html失敗21說「庫使用不正確」 - 任何幫助?
哦,我查 - 數據庫文件不生成,但目前還沒有表中它,這樣的onCreate()以上是沒有得到調用。
我要發佈,「不,沒有運氣的我」,然後注意到我有2'D.close()'線 - 在'的onCreate去掉一個後()',它似乎是現在的工作。謝謝! – Izkata
有關此行爲的解釋,請參閱http://stackoverflow.com/questions/5324241/what-happens-to-sqlitedatabase-object-which-is-passed-to-oncreate-method。 – Chris