我收到了上述错误,我真的无法找到我做错了什么。 我正在关注视频: https://www.youtube.com/watch?v=p8TaTgr4uKM 我看了android.database.sqlite.SQLiteException: table X has no column named Y: , while compiling: INSERT INTO 但我找不到错误。 我担心onCreate of RunsHistoryDataBase没有被调用因为我把它放在了Log.d和insertData中并且onCreate的Log.d没有显示出来并且insertData的Log.d确实显示出来了。 AnyWay我无法将数据插入数据库,我真的不明白为什么.. 有什么帮助吗?
这些是SQLiteDB的代码: 公共类RunsHistoryDataBase扩展了SQLiteOpenHelper {
public static final String dataBaseName = "RunsHistory.db";
public static final String tableName = "RunsHistoryTable";
public static final String colDate = "Date";
public static final String colPartnersName = "PartnersName";
public static final String colDuration = "Duration";
public static final String colDistance = "Distance";
public RunsHistoryDataBase(Context context) {
// create the data base and the table.
super(context, dataBaseName, null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
String createDataBase = "CREATE TABLE "+ tableName
+ "("
+ colDate +" TEXT PRIMARY KEY, "
+ colPartnersName + " TEXT, "
+ colDuration + " INTEGER, "
+ colDistance + " INTEGER);";
db.execSQL(createDataBase);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IS EXISTS " + tableName);
onCreate(db);
}
public boolean insertNewHistoryRun(Date date, String partnersName, int duration, int distance){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(colDistance, distance);
contentValues.put(colDuration, duration);
contentValues.put(colDate, getFixedDateForPrint(date.toString()));
contentValues.put(colPartnersName, partnersName);
long result = db.insert(tableName, null, contentValues);
if(result == -1){
Log.d("result == -1","");
return false;
}
return true;
}
public Cursor getAllData(){
SQLiteDatabase db = this.getWritableDatabase();
Cursor res = db.rawQuery("select * from "+tableName, null);
return res;
}
}
这里的Ande是将数据插入db:
的片段代码公共类HistoryFragment扩展了Fragment {
private String mParam1;
private String mParam2;
Button insertDataBut;
Button getDataBut;
Button updateDataBut;
EditText date_editText;
EditText distance_history_editText;
EditText partners_name_editText;
EditText duration_editText_history;
RunsHistoryDataBase myDB;
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
View view;
private OnHistoryInteractionListener mListener;
public HistoryFragment() {
// Required empty public constructor
}
public static HistoryFragment newInstance(String param1, String param2) {
HistoryFragment fragment = new HistoryFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
myDB = new RunsHistoryDataBase(getContext());
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
view = inflater.inflate(R.layout.fragment_history, container, false);
insertDataBut = (Button) view.findViewById(R.id.insertNewButton);
getDataBut = (Button) view.findViewById(R.id.getDataButton);
updateDataBut = (Button) view.findViewById(R.id.updateButton);
date_editText = (EditText) view.findViewById(R.id.date_editText);
distance_history_editText = (EditText) view.findViewById(R.id.distance_history_editText);
partners_name_editText = (EditText) view.findViewById(R.id.partners_name_editText);
duration_editText_history = (EditText) view.findViewById(R.id.duration_editText_history);
AddData();
viewAll();
return view;
}
public void AddData() {
insertDataBut.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Date date = new Date();
boolean ifInserted = myDB.insertNewHistoryRun(date, partners_name_editText.getText().toString(),
Integer.parseInt(duration_editText_history.getText().toString()), Integer.parseInt(distance_history_editText.getText().toString()));
if (ifInserted) {
Toast.makeText(getContext(), "data is inserted", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getContext(), "is not inserted", Toast.LENGTH_LONG).show();
}
}
});
}
public void viewAll() {
getDataBut.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Cursor res = myDB.getAllData();
if (res.getCount() == 0) {
showMessage("No History", "Empty");
return;
}
StringBuffer buffer = new StringBuffer();
while (res.moveToNext()) {
buffer.append("Date :" + res.getString(0) + "\n");
buffer.append("Partners Name :" + res.getString(1) + "\n");
buffer.append("Duration :" + res.getString(2) + "\n");
buffer.append("Distance :" + res.getString(3) + "\n");
}
showMessage("Data", buffer.toString());
}
});
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onHistoryInteraction(uri);
}
}
public void showMessage(String title, String message) {
AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
builder.setCancelable(true);
builder.setTitle(title);
builder.setMessage(message);
builder.show();
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnHistoryInteractionListener) {
mListener = (OnHistoryInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDestroy() {
super.onDestroy();
myDB.close();
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
public interface OnHistoryInteractionListener {
void onHistoryInteraction(Uri uri);
}
}