I am developing an Android app for a bus schedule. I have a SQLite database with the stops and times, but i am currently having a nightmare trying to acces it. I googled this issue, but i couldn't find a solution.
I have built a DataBaseHelper class that extends SQLiteOpenHelper with the code as follows:
public class DataBaseHelper extends SQLiteOpenHelper { private static String DB_PATH;
private static String DB_NAME = "BagesExpress_def";
private SQLiteDatabase myDataBase;
private final Context myContext;
public DataBaseHelper(Context context){
super(context, DB_NAME, null,1);
this.myContext = context;
this.DB_PATH = this.myContext.getDatabasePath(DB_NAME).getAbsolutePath();
}
public void createDatabase() throws IOException{
boolean dbExist = checkDataBase();
if(dbExist){
Log.v("EXISTS", "dbExistsfucku");
}else{
this.getReadableDatabase();
try{
copyDataBase();
} catch (IOException e){
throw new Error ("Error copying data");
}
}
}
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH;
checkDB = SQLiteDatabase.openDatabase(myPath,null,SQLiteDatabase.OPEN_READONLY);
}catch(SQLiteException e){
}
if(checkDB!=null){
checkDB.close();
}
return checkDB != null;
}
private void copyDataBase() throws IOException{
InputStream myInput = myContext.getAssets().open(DB_NAME);
String outFilename = DB_PATH;
OutputStream myOutput = new FileOutputStream(outFilename);
byte[] buffer = new byte [1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer,0,length);
}
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException{
String myPath = DB_PATH;
myDataBase = SQLiteDatabase.openDatabase(myPath,null, SQLiteDatabase.OPEN_READONLY);
}
public synchronized void close() {
if(myDataBase!=null)
myDataBase.close();
super.close();
}
@Override
public void onCreate (SQLiteDatabase db){
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
if(newVersion>oldVersion)
try{
copyDataBase();
}
catch(IOException ioe){
}
}
public List<Viatge> getViatges(int horaSortida, int paradaSortida, int paradaArribada){
Log.v("DBPATH",DB_PATH);
List<Viatge> viatges = new ArrayList<Viatge>();
String selectQuery = "SELECT t1.run, t1.parada, t2.parada,t1.hora,t2.hora FROM directesDirBarna t1, directesDirBarna t2 \n" +
"WHERE (t1.run = t2.run AND t1.parada = "+ paradaSortida +" AND t2.parada = " + paradaArribada +") \n" +
"AND t1.Hora > "+ horaSortida +" AND t2.Hora <> '';";
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor.moveToFirst()){
do{
Viatge viatge = new Viatge();
viatge.setParadaSortida(Integer.parseInt(cursor.getString(1)));
viatge.setParadaArribada(Integer.parseInt(cursor.getString(2)));
viatge.setHoraSortida(Integer.parseInt(cursor.getString(3)));
viatge.setHoraArribada(Integer.parseInt(cursor.getString(4)));
viatges.add(viatge);
} while(cursor.moveToNext());
}
return viatges;
}
}
Inside a testSQL Activity i am using the following code:
public class SqlTest extends Activity {
private DataBaseHelper myDBHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sql_test);
Button sqlButton = (Button)findViewById(R.id.SQLBtn);
sqlButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
myDBHelper = new DataBaseHelper(getApplicationContext());
try {
myDBHelper.openDataBase();
}
catch(SQLException sqle){
}
myDBHelper.getViatges(1000,1,10);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_sql_test, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
When i press the button to fetch the database i get the following error:
android.database.sqlite.SQLiteException: no such table: directesDirBarna (code 1)
Despite this table existing in my database.
I suspect that this happens because my code can't find the DataBase so it creates a blank one and thus it can't find anything in it, but i can't find where this happens.
Can anyone illuminate my way? Thanks a lot.
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