奇怪的例外提高隨機的隨機SQLiteException(未在特定的場景/模式),例外的是如下這給"Caused by: android.database.sqlite.SQLiteException: no such table: Courses: , while compiling: SELECT * FROM Courses"
遭遇「沒有這樣的表」
運行完美每次但有時它拋出異常以上,所以很明顯,數據庫總是存在的,表也在該數據庫內。
下面相關的logcat輸出中
11-29 01:16:02.570: E/AndroidRuntime(13916): FATAL EXCEPTION: main
11-29 01:16:02.570: E/AndroidRuntime(13916): java.lang.RuntimeException: Unable to resume activity {com.nobel.biocare/com.nobel.biocare.Courses_Events}: android.database.sqlite.SQLiteException: no such table: Courses: , while compiling: SELECT * FROM Courses
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2124)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2139)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1672)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.os.Handler.dispatchMessage(Handler.java:99)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.os.Looper.loop(Looper.java:123)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.app.ActivityThread.main(ActivityThread.java:3687)
11-29 01:16:02.570: E/AndroidRuntime(13916): at java.lang.reflect.Method.invokeNative(Native Method)
11-29 01:16:02.570: E/AndroidRuntime(13916): at java.lang.reflect.Method.invoke(Method.java:507)
11-29 01:16:02.570: E/AndroidRuntime(13916): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
11-29 01:16:02.570: E/AndroidRuntime(13916): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
11-29 01:16:02.570: E/AndroidRuntime(13916): at dalvik.system.NativeStart.main(Native Method)
11-29 01:16:02.570: E/AndroidRuntime(13916): Caused by: android.database.sqlite.SQLiteException: no such table: Courses: , while compiling: SELECT * FROM Courses
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:92)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:65)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:83)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:49)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:42)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1356)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1235)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1189)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1271)
11-29 01:16:02.570: E/AndroidRuntime(13916): at com.nobel.biocare.database.DBHelper.read_Courses(DBHelper.java:444)
11-29 01:16:02.570: E/AndroidRuntime(13916): at com.nobel.biocare.Courses_Events.onResume(Courses_Events.java:131)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1150)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.app.Activity.performResume(Activity.java:3832)
11-29 01:16:02.570: E/AndroidRuntime(13916): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2114)
11-29 01:16:02.570: E/AndroidRuntime(13916): ... 12 more
下面DBHelper類相關的代碼片段
public Cursor read_Courses(SQLiteDatabase db) {
return db.query(TBL_Courses, null, null, null, null, null, null);
}
Activity class where this exception occur
以下活動
protected void onResume() {
super.onResume();
MyOpenDB();
setTab_Images(Common.Courses_Events);
if (!myApp.checkNetworkRechability()) {
Show_No_Internet();
}
if (is_DB_DBHelper_Null() && isDBOpen()) {
fetch_Courses_from_DB(dbHelper.read_Courses(MyDb));
fetch_Events_from_DB(dbHelper.read_Events(MyDb));
}
}
我茫然不知該如何解決這個異常的相關代碼段。
你是否真的在某處創建表? – Brian
我使用Firefox的SQLite擴展製作數據庫和所有表格,並直接在我的項目中導入該文件,因此沒有創建表的代碼。 – rajpara
MyOpenDB();方法看起來很腥。你不能通過調用同一個實例上的方法來打開數據庫,而不是重新實例化該字段嗎?很像你的MyCloseDB();方法?當一個實例還沒有被垃圾收集,並且你使用了錯誤的引用時,可能會有一個短暫的時刻。 – mango