Hey everyone. I’m kinda new to android programming so please bear with me. I’m having some problems with retrieving records from the db. Basically, all I want to do is to store latitudes and longitudes which GPS positioning functions outputs and display them in a list using ListActivity on different tab later on. This is how the code for my DBAdapter helper class looks like:
public class DBAdapter
{
public static final String KEY_ROWID = "_id";
public static final String KEY_LATITUDE = "latitude";
public static final String KEY_LONGITUDE = "longitude";
private static final String TAG = "DBAdapter";
private static final String DATABASE_NAME = "coords";
private static final String DATABASE_TABLE = "coordsStorage";
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_CREATE =
"create table coordsStorage (_id integer primary key autoincrement, "
+ "latitude integer not null, longitude integer not null);";
private final Context context;
private DatabaseHelper DBHelper;
private SQLiteDatabase db;
public DBAdapter(Context ctx)
{
this.context = ctx;
DBHelper = new DatabaseHelper(context);
}
private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion,
int newVersion)
{
Log.w(TAG, "Upgrading database from version " + oldVersion
+ " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS titles");
onCreate(db);
}
}
//---opens the database---
public DBAdapter open() throws SQLException
{
db = DBHelper.getWritableDatabase();
return this;
}
//---closes the database---
public void close()
{
DBHelper.close();
}
//---insert a title into the database---
public long insertCoords(int latitude, int longitude)
{
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_LATITUDE, latitude);
initialValues.put(KEY_LONGITUDE, longitude);
return db.insert(DATABASE_TABLE, null, initialValues);
}
//---deletes a particular title---
public boolean deleteTitle(long rowId)
{
return db.delete(DATABASE_TABLE, KEY_ROWID +
"=" + rowId, null) > 0;
}
//---retrieves all the titles---
public Cursor getAllTitles()
{
return db.query(DATABASE_TABLE, new String[] {
KEY_ROWID,
KEY_LATITUDE,
KEY_LONGITUDE},
null,
null,
null,
null,
null);
}
//---retrieves a particular title---
public Cursor getTitle(long rowId) throws SQLException
{
Cursor mCursor =
db.query(true, DATABASE_TABLE, new String[] {
KEY_ROWID,
KEY_LATITUDE,
KEY_LONGITUDE},
KEY_ROWID + "=" + rowId,
null,
null,
null,
null,
null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
//---updates a title---
/*public boolean updateTitle(long rowId, int latitude,
int longitude)
{
ContentValues args = new ContentValues();
args.put(KEY_LATITUDE, latitude);
args.put(KEY_LONGITUDE, longitude);
return db.update(DATABASE_TABLE, args,
KEY_ROWID + "=" + rowId, null) > 0;
}*/
}Now my question is – am I doing something wrong here? If yes could someone please tell me what? And how I should retrieve the records in organised list manner? Help would be greatly appreciated!!
This are the error it throws:
06-06 14:49:32.434: ERROR/Database(276): Error inserting latitude=0 longitude=0 06-06 14:49:32.434: ERROR/Database(276): android.database.sqlite.SQLiteException: no such table: coordsStorage: , while compiling: INSERT INTO coordsStorage(latitude, longitude) VALUES(?, ?); 06-06 14:49:32.434: ERROR/Database(276): at android.database.sqlite.SQLiteProgram.native_compile(Native Method) 06-06 14:49:32.434: ERROR/Database(276): at android.database.sqlite.SQLiteProgram.compile(SQLiteProgram.java:110) 06-06 14:49:32.434: ERROR/Database(276): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:59) 06-06 14:49:32.434: ERROR/Database(276): at android.database.sqlite.SQLiteStatement.(SQLiteStatement.java:41) 06-06 14:49:32.434: ERROR/Database(276): at android.database.sqlite.SQLiteDatabase.compileStatement(SQLiteDatabase.java:925) 06-06 14:49:32.434: ERROR/Database(276): at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1300) 06-06 14:49:32.434: ERROR/Database(276): at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1173) 06-06 14:49:32.434: ERROR/Database(276): at tabs.app.DBAdapter.insertCoords(DBAdapter.java:81) 06-06 14:49:32.434: ERROR/Database(276): at tabs.app.Tribocracy$1.onClick(Tribocracy.java:118) 06-06 14:49:32.434: ERROR/Database(276): at android.view.View.performClick(View.java:2344)
and then when I’m trying to retrieve it it throws this:
06-06 14:49:52.734: INFO/Process(51): Sending signal. PID: 276 SIG: 3 06-06 14:49:52.734: INFO/dalvikvm(276): threadid=7: reacting to signal 3 06-06 14:49:52.734: ERROR/dalvikvm(276): Unable to open stack trace file /data/anr/traces.txt': Permission denied
It looks like the table doesn’t exist for some reason.
You may want to try increasing your version number, to force an upgrade; if the database itself exists then the onCreate method won’t be called – increasing the version will force onUpgrade to be called, and your implementation drops the table and recreates it. This should either fix your error, or give you a new error to work with!