I'm searching for user input in a database. It is a dictionary app. I have a toggle button that allows user to switch between 2 languages. It works, however it doesn't work when I switch to a different language. Basically I want to apply a different sql query to when the button is switched to another language.
Here is my code:
try {
Cursor cursor = dictionary.getDictionaryDatabase().rawQuery("SELECT * FROM fr_definition JOIN fr_adresse_definition ON fr_definition.data_id = fr_adresse_definition.definition WHERE index_nom_adresse='"+word[0].toLowerCase().trim()+"'", null);
cursor.moveToFirst();
if (cursor.getCount() != 0) {
if (word[1] == null || word[1].equals("English")) {
translatedWord = cursor.getString(2);
} else {
//dictionary.getDictionaryDatabase().rawQuery("SELECT * FROM en_definition JOIN en_adresse_definition ON en_definition.data_id = en_adresse_definition.definition WHERE index_nom_adresse='"+word[0].toLowerCase().trim()+"'", null);
translatedWord = cursor.getString(1);
}
} else {
translatedWord = "The word is not in database";
}
cursor.close();
} catch (SQLiteException sqle) {
translatedWord = "The word is not in database";
}
dictionary.close();
Wouldn't something like this let you use your other query?
try {
Cursor cursor;
if (word[1] == null || word[1].equals("English")) {
cursor = dictionary.getDictionaryDatabase().rawQuery("SELECT * FROM fr_definition JOIN fr_adresse_definition ON fr_definition.data_id = fr_adresse_definition.definition WHERE index_nom_adresse='"+word[0].toLowerCase().trim()+"'", null);
cursor.moveToFirst();
if (cursor.getCount() != 0) {
translatedWord = cursor.getString(2);
}
} else {
cursor = dictionary.getDictionaryDatabase().rawQuery("SELECT * FROM en_definition JOIN en_adresse_definition ON en_definition.data_id = en_adresse_definition.definition WHERE index_nom_adresse='"+word[0].toLowerCase().trim()+"'", null);
cursor.moveToFirst();
if (cursor.getCount() != 0) {
translatedWord = cursor.getString(1);
}
}
cursor.close();
} catch (SQLiteException sqle) {
translatedWord = "The word is not in database";
}
dictionary.close();
Related
I am making a media player which loads metadata of songs into a database.
Below is my function for checking whether the db is empty or not but it isn't working. Please tell me what's wrong with my code and suggest a correction or a better alternative.
private static boolean isDbEmpty(SQLiteDatabase songsDb) {
try {
Cursor c = songsDb.rawQuery("SELECT * FROM " + SongsTable.TABLE_NAME, null);
if (c.moveToFirst()) { // c.getCount() == 0 is also not working
Log.d(TAG, "isDbEmpty: not empty");
return false;
}
c.close();
} catch (SQLiteException e) {
Log.d(TAG, "isDbEmpty: doesn't exist");
return true;
}
return true;
}
Use the following query to achieve your goal. There are two tables created automatically - android_metadata and sqlite_sequence, so we apply a NOT condition in the query.
SELECT count(*) FROM sqlite_master WHERE type = 'table' AND name != 'android_metadata' AND name != 'sqlite_sequence';
Try this.
private static boolean isDbEmpty(SQLiteDatabase songsDb) {
Cursor c = null;
try {
c = songsDb.rawQuery("SELECT * FROM " + SongsTable.TABLE_NAME, null);
if (c == null || c.getCount() == 0) {
return true;
} else if (c.moveToFirst()) {
Log.d(TAG, "isDbEmpty: not empty");
return false;
}
} catch (SQLiteException e) {
Log.d(TAG, "isDbEmpty: doesn't exist");
return true;
}finally {
if(c != null){
c.close();
}
}
return true;
}
This will only tell you if the TABLE is empty, not the DATABASE.
Regardless, you could use code like:
Cursor countCursor = songsDb.rawQuery("select count(*) from " + SongsTable.TABLE_NAME, null);
countCursor.moveToFirst();
int count = countCursor.getInt(0);
countCursor.close();
And then test count.
You can check like this :
Cursor c = songsDb.rawQuery("SELECT * FROM " + SongsTable.TABLE_NAME, null);
cursor.moveToFirst();
if (cursor != null && cursor.getCount() == 0) {
//for empty
return true;
}else{
// not empty
return false;
}
I have written a method for whether data is saved. Method must return false but it return true. My codes are here;
private boolean baskaVarMi(String gelenTarih) {
boolean sonuc = false;
int k = 0;
SQLiteDatabase db = dbo.getReadableDatabase();
String sql = "select * from gunlukler where tarih='" + gelenTarih + "'";
Cursor c = db.rawQuery(sql, null);
if (c.moveToFirst()) {
do {
if (c.getString(c.getColumnIndex("tarih")) == gelenTarih) {
k++;
}
} while (c.moveToNext());
}
if (k > 0) {
sonuc = true;
}else if(k == 0){
sonuc = false;
}
return sonuc;
}
What is the problem in this method?
change with it:
Cursor c = db.rawQuery(sql, null);
if (c.getCount()>0) {
c.moveToFirst()
do {
if (c.getString(c.getColumnIndex("tarih")).equals(gelenTarih)) {
k++;
}
} while (c.moveToNext());
}
Try in this way....
Cursor cur = db.query(SQL_TABLE, new String[] { URLNAME,ID,URLVALUE }, null, null,
null, null, null); // query..
c.getString(c.getColumnIndex("tarih")) == gelenTarih
is not right. Go with
c.getString(c.getColumnIndex("tarih")).equals( gelenTarih)
use only this
private boolean baskaVarMi(String gelenTarih) {
SQLiteDatabase db = dbo.getReadableDatabase();
String sql = "select * from gunlukler where tarih='" + gelenTarih + "'";
Cursor c = db.rawQuery(sql, null);
if (c.moveToFirst())
{
return true;
}
else
{
return false;
}
}
I want to get a row and this row have 2 columns which named username and password my code is here:
String selection = PROFILE_COLUMN_USERNAME + " = '" + userName+ "' AND " +PROFILE_COLUMN_PASSWORD + " = '" + password + "'";
Cursor cursor = database.query(TABLE_NAME, new String[] {PROFILE_COLUMN_USERNAME, PROFILE_COLUMN_PASSWORD }, selection,null, null, null, null);
I got a sample data like username = erdem and password= c on my db but when i write this sample and write to get username like this:
String s =cursor.getString(cursor.getColumnIndex(PROFILE_COLUMN_USERNAME));
it doesn't work. Why?
Try something like below : Here "path_on_server" is the name of the column in the DB table whose value is being extracted. You can change it to your table's column name.
String query = "some query";
Cursor c = newDB.rawQuery(query, null);
if (c != null) {
if (c.moveToFirst()) {
do {
mPathOnServer = c.getString(c
.getColumnIndex("path_on_server"));
} while (c.moveToNext());
}
}
} catch (SQLiteException se) {
Log.e(getClass().getSimpleName(),
"Could not extract information from DB");
}
Use moveToFirst, read the documentation.
Try this way...
Cursor cursor = null;
try {
String queryString = "SELECT * FROM Table_Name";
cursor = myDatabase.rawQuery(queryString, null);
if (cursor != null && cursor.moveToFirst()) {
do {
String nextUser = new String(cursor.getString(cursor
.getColumnIndex("driver_fname")));
} while (cursor.moveToNext());
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (cursor != null && !cursor.isClosed()) {
cursor.deactivate();
cursor.close();
cursor = null;
}
if (myDatabase != null) {
myDatabase.close();
}
}
I have used following codes to retrieve record:
String getCredentialsFromAdmint(String name ,String pwd) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_ADMIN, new String[] { KEY_ID,
KEY_A_USER_NAME, KEY_A_PWD }, KEY_A_USER_NAME + "=?" + " AND " + KEY_A_PWD + "=?",
new String[] { name , pwd }, null, null, null, null);
if (cursor != null){
cursor.moveToFirst();
return cursor.getString(1);
}
else{
return "norecord";
}
This code works if there is a record but if no record is found then application gets an error.
Is there any other ways to retrieve data from database?
Change your code to following
if ( cursor.moveToFirst()){
return cursor.getString(1);
} else{
return "norecord";
}
You don't check if cursor.moveToFirst() returns true;
It should looks like this:
if (cursor != null) {
if(cursor.moveToFirst()){
return cursor.getString(cursor.getColumnIndexOrThrow(KEY_A_USER_NAME));
} else{
//no record
}
} else {
//invalid uri
}
Try to use the following code instead
if (cursor != null){
cursor.moveToFirst();
if(cursor.isAfterLast() == false) {
return cursor.getString(1);
}
else
{
return "norecord";
}
}
else{
return "norecord";
}
I have one employee table which has column values
("store_loc_id","name","password","address_id","role_id",
"retailer_id").
I want to get the name and password from this table using cursor. how can i do??
Haven't check this code, but the idiom should be understandable.
Cursor cursor = db.query(...);
if(cursor !=null && cursor.moveToFirst()) {
do {
String name = cursor.getString(cursor.getColumnIndex("name"));
} while (cursor.moveToNext());
}
public Cursor getEmployee() {
try {
return db.query(employee, new String[] { "name", "password" },
null, null, null, null, null);
} catch (SQLException e) {
Log.e("Exception on query", e.toString());
return null;
}
}
Cursor c = db.getEmployee();
if (c == null) {
// do nothing
} else {
if (c.getCount() > 0) {
if (c.moveToFirst()) {
do {
String Name = c.getString(0);
String Password = c.getString(1);
} while (c.moveToNext());
}
}
}