dbテーブルの「ORDERBY」を使用してすべてのdbエントリを並べ替えたい。何が間違っているのかわかりませんが、機能しません。
ここに私のコード：
class NoteHelper extends SQLiteOpenHelper {
private static final String DATABASE_NAME = "note.db";
private static final int SCHEMA_VERSION = 1;
public NoteHelper(Context context){
super(context, DATABASE_NAME, null, SCHEMA_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db){
db.execSQL("CREATE TABLE Notes (_id INTEGER PRIMARY KEY AUTOINCREMENT, note TEXT);");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
//no-op, since will not be called until 2nd schema
//version exists
}
public void insert(String note) {
ContentValues cv = new ContentValues();
cv.put("note", note);
//you must pass it at lease one name of a colum
getWritableDatabase().insert("Notes", "note", cv);
}
public void update(String id, String note){
ContentValues cv = new ContentValues();
String[] args = {id};
cv.put("note", note);
getWritableDatabase().update("Notes", cv, "_id=?", args);
}
public void delete(String id){
getWritableDatabase().delete("Notes", "_id=?", new String[] {id});
}
public Cursor getAll(){
return (getReadableDatabase().rawQuery("SELECT _id, note FROM Notes", null));
}
public Cursor getAllSorted(){
return (getReadableDatabase().rawQuery("SELECT note FROM Notes ORDER BY note COLLATE NOCASE", null));
}
public String getNote(Cursor c){
return(c.getString(1));
}
public Cursor getById(String id) {
String[] args = {id};
return(getReadableDatabase().rawQuery("SELECT _id, note FROM Notes WHERE _id=?", args));
}
}
問題がどこにあるかを誰かが知っているなら、私を助けてください、ありがとう。
ここにメインコードがあります：
NoteAdapter adapter = null;
NoteHelper helper = null;
Cursor dataset_cursor = null;
EditText editNote = null;
//this is how track which note we are working on
String noteId = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
try{
setContentView(R.layout.history);
ListView list = (ListView)findViewById(R.id.list);
editNote = (EditText)findViewById(R.id.myEditText);
helper = new NoteHelper(this);
dataset_cursor = helper.getAll();
startManagingCursor(dataset_cursor);
adapter = new NoteAdapter(dataset_cursor);
list.setAdapter(adapter);
class NoteAdapter extends CursorAdapter {
NoteAdapter(Cursor c){
super(Ztutorial11.this, c);
}
public void bindView(View row, Context ctxt, Cursor c) {
NoteHolder holder = (NoteHolder)row.getTag();
holder.populateFrom(c, helper);
}
public View newView(Context ctxt, Cursor c, ViewGroup parent) {
LayoutInflater inflater = getLayoutInflater();
View row = inflater.inflate(R.layout.row, parent, false);
NoteHolder holder = new NoteHolder(row);
row.setTag(holder);
return (row);
}
}
static class NoteHolder {
private TextView noteText = null;
NoteHolder(View row){
noteText = (TextView)row.findViewById(R.id.note);
}
void populateFrom(Cursor c, NoteHelper helper) {
noteText.setText(helper.getNote(c));
}
}
public boolean onCreateOptionsMenu(Menu menu){
super.onCreateOptionsMenu(menu);
MenuInflater awesome = getMenuInflater();
awesome.inflate(R.menu.menu_expresions, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item){
switch(item.getItemId()){
case R.id.Az:
//something to do
helper.getAllSorted();
//update the view
dataset_cursor.requery();
return true;
case R.id.Za:
//something to do
return true;
case R.id.deleteall:
//something to do
helper.deleteAll();
dataset_cursor.requery();
return true;
case R.id.undo:
//something to do
return true;
}
return false;
}
};