我想刪除我從SQLite數據庫表中輸入的所有行。表名是tbltask。 我試圖刪除表並從表中刪除*,但那些給我運行時錯誤。 我想在Button OnClickListner事件中觸發此事件。從SQLite數據庫表中刪除所有錶行
下面的代碼是我的嘗試:
String delete = "DELETE FROM "+DATABASE_TABLE;
db.rawQuery(delete, null);
db.delete(DATABASE_TABLE, null, null);
的logcat:
11-15 17:45:04.660: DEBUG/AndroidRuntime(300): Shutting down VM
11-15 17:45:04.660: WARN/dalvikvm(300): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
11-15 17:45:04.710: ERROR/AndroidRuntime(300): FATAL EXCEPTION: main
11-15 17:45:04.710: ERROR/AndroidRuntime(300): java.lang.NullPointerException
11-15 17:45:04.710: ERROR/AndroidRuntime(300): at database.com.android.DatabaseAccess.drop(DatabaseAccess.java:258)
11-15 17:45:04.710: ERROR/AndroidRuntime(300): at com.android.ExtraActivity$3$1.onClick(ExtraActivity.java:61)
11-15 17:45:04.710: ERROR/AndroidRuntime(300): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:158)
11-15 17:45:04.710: ERROR/AndroidRuntime(300): at android.os.Handler.dispatchMessage(Handler.java:99)
11-15 17:45:04.710: ERROR/AndroidRuntime(300): at android.os.Looper.loop(Looper.java:123)
11-15 17:45:04.710: ERROR/AndroidRuntime(300): at android.app.ActivityThread.main(ActivityThread.java:4627)
11-15 17:45:04.710: ERROR/AndroidRuntime(300): at java.lang.reflect.Method.invokeNative(Native Method)
11-15 17:45:04.710: ERROR/AndroidRuntime(300): at java.lang.reflect.Method.invoke(Method.java:521)
11-15 17:45:04.710: ERROR/AndroidRuntime(300): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
11-15 17:45:04.710: ERROR/AndroidRuntime(300): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
11-15 17:45:04.710: ERROR/AndroidRuntime(300): at dalvik.system.NativeStart.main(Native Method)
11-15 17:45:04.781: WARN/ActivityManager(58): Force finishing activity com.android/.ExtraActivity
11-15 17:45:05.320: WARN/ActivityManager(58): Activity pause timeout for HistoryRecord{45061a70 com.android/.ExtraActivity}
11-15 17:45:14.857: WARN/ActivityManager(58): Launch timeout has expired, giving up wake lock!
11-15 17:45:15.402: WARN/ActivityManager(58): Activity idle timeout for HistoryRecord{450141d0 com.android/.WelcomActivity}
11-15 17:45:20.572: WARN/ActivityManager(58): Activity destroy timeout for HistoryRecord{45061a70 com.android/.ExtraActivity}
這是logcat的輸出,我得到了下面的查詢:
String delete = "DELETE FROM taskTable";
db.execSQL(delete);
你會得到什麼錯誤?發佈logcat輸出 – dymmeh
你得到的錯誤是什麼....只是嘗試這個沒有rawquery部分。 'sqLiteDatabase.delete(MYDATABASE_TABLE,null,null);' – Rakhita