我被卡住了。我找不到我做錯了什麼,所以請幫助任何人。 雖然這是一個非常簡單的任務,但我不明白數據庫的外觀如何。如何使用光標從數據庫檢索數據? (Android,SQLite)
下面的代碼我用將數據插入到表中的數據庫:
EditText title = (EditText)findViewById(R.id.Title);
String Title = title.getText().toString();
EditText d = (EditText)findViewById(R.id.director);
String Director = d.getText().toString();
SQLiteDatabase db = openOrCreateDatabase("Films", MODE_PRIVATE, null);
db.execSQL("CREATE TABLE IF NOT EXISTS MyFilms (idFilm INTEGER PRIMARY KEY AUTOINCREMENT, Title VARCHAR, Director VARCHAR, Year INTEGER, Rating INTEGER);");
db.execSQL("INSERT INTO MyFilms (Title) VALUES('" + Title + "');");
db.execSQL("INSERT INTO MyFilms (Director) VALUES('" + Director + "');");
db.close();
此代碼是否給我列idfilm
,Title
,Director
,Year
,Rating
表? 如果是這樣,還是有一個問題,當我嘗試使用此代碼Title
列中檢索所有的標題:
SQLiteDatabase db = openOrCreateDatabase("Films", MODE_PRIVATE, null);
Cursor c = db.rawQuery("SELECT * FROM MyFilms",null);
c.moveToFirst();
while (c.isAfterLast() == false) {
String Title = c.getString(c.getColumnIndex("Director"));
stringList.add(Title); //This I use to create listlayout dynamically and show all the Titles in it
c.moveToNext();
}
錯誤日誌:
05-21 17:50:14.666: E/AndroidRuntime(27045): FATAL EXCEPTION: main
05-21 17:50:14.666: E/AndroidRuntime(27045): java.lang.NullPointerException
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:355)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.widget.ArrayAdapter.getView(ArrayAdapter.java:323)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.widget.AbsListView.obtainView(AbsListView.java:1409)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.widget.ListView.measureHeightOfChildren(ListView.java:1216)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.widget.ListView.onMeasure(ListView.java:1127)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.view.View.measure(View.java:8313)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.widget.RelativeLayout.measureChild(RelativeLayout.java:566)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:381)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.view.View.measure(View.java:8313)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.view.View.measure(View.java:8313)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.widget.LinearLayout.measureVertical(LinearLayout.java:531)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.view.View.measure(View.java:8313)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.view.View.measure(View.java:8313)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.view.ViewRoot.performTraversals(ViewRoot.java:839)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.view.ViewRoot.handleMessage(ViewRoot.java:1859)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.os.Handler.dispatchMessage(Handler.java:99)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.os.Looper.loop(Looper.java:123)
05-21 17:50:14.666: E/AndroidRuntime(27045): at android.app.ActivityThread.main(ActivityThread.java:3683)
05-21 17:50:14.666: E/AndroidRuntime(27045): at java.lang.reflect.Method.invokeNative(Native Method)
05-21 17:50:14.666: E/AndroidRuntime(27045): at java.lang.reflect.Method.invoke(Method.java:507)
05-21 17:50:14.666: E/AndroidRuntime(27045): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
05-21 17:50:14.666: E/AndroidRuntime(27045): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-21 17:50:14.666: E/AndroidRuntime(27045): at dalvik.system.NativeStart.main(Native Method)
爲什麼DDMS拋出NullPointerException?我應該如何從「標題」中獲取數據?我試圖使用c.getString(),但是當我要求c.getString(1)時,仍然存在NullPointerException,儘管它在設置c.getString(2)時返回「Director」。請幫忙!
發佈logcat,所以我們可以看到錯誤,但我不認爲你正在創建你的表 – tyczj