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- public class DbHelper extends SQLiteOpenHelper {
- public static final String TAG = DbHelper.class.getSimpleName();
- public static final String DB_NAME = "myapp.db";
- public static final int DB_VERSION = 1;
- public static final String USER_TABLE = "users";
- public static final String COLUMN_ID = "_id";
- public static final String COLUMN_usurarios = "usurarios";
- public static final String COLUMN_PASS = "password";
- /*
- create table users(
- id integer primary key autoincrement,
- usurarios text,
- password text);
- */
- public static final String CREATE_TABLE_USERS = "CREATE TABLE " + USER_TABLE + "("
- + COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
- + COLUMN_usurarios + " TEXT,"
- + COLUMN_PASS + " TEXT);";
- public DbHelper(Context applicationContext, Object o, Context context, int i) {
- super(context, DB_NAME, null, DB_VERSION);
- }
- @Override
- public void onCreate(SQLiteDatabase db) {
- db.execSQL(CREATE_TABLE_USERS);
- }
- @Override
- public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
- db.execSQL("DROP TABLE IF EXISTS " + USER_TABLE);
- onCreate(db);
- }
- /**
- * Storing user details in database
- * */
- public void addUser(String usurarios, String password) {
- SQLiteDatabase db = this.getWritableDatabase();
- ContentValues values = new ContentValues();
- values.put(COLUMN_usurarios, usurarios);
- values.put(COLUMN_PASS, password);
- long id = db.insert(USER_TABLE, null, values);
- db.close();
- Log.d(TAG, "Usuario insertado" + id);
- }
- public boolean getUser(String usurarios, String pass){
- //HashMap<String, String> user = new HashMap<String, String>();
- String selectQuery = "select * from " + USER_TABLE + " where " +
- COLUMN_usurarios + " = " + "'"+usurarios+"'" + " and " + COLUMN_PASS + " = " + "'"+pass+"'";
- SQLiteDatabase db = this.getReadableDatabase();
- Cursor cursor = db.rawQuery(selectQuery, null);
- // Move to first row
- cursor.moveToFirst();
- if (cursor.getCount() > 0) {
- return true;
- }
- cursor.close();
- db.close();
- return false;
- }
- public String eliminar(String usuarios){
- String mensaje="";
- SQLiteDatabase db= this.getWritableDatabase();
- int cantidad = db.delete("myapp.db","usuarios='"+usuarios+"'",null);
- if(cantidad!=0){
- mensaje="eliminado correctamente";
- }else{
- mensaje="No existe";
- }
- return mensaje;
- }
- public ArrayList llenar_lv(){
- ArrayList<String> lista = new ArrayList<>();
- SQLiteDatabase database = this.getWritableDatabase();
- String q = "SELECT * FROM datos";
- Cursor registros = database.rawQuery(q,null);
- if(registros.moveToFirst()){
- do{
- lista.add(registros.getString(1));
- }while(registros.moveToNext());
- }
- return lista;
- }
- public String eliminar(String usuarios){
- String mensaje="";
- SQLiteDatabase db= this.getWritableDatabase();
- int cantidad = db.delete("myapp.db","usuarios='"+usuarios+"'",null);
- if(cantidad!=0){
- mensaje="eliminado correctamente";
- }else{
- mensaje="No existe";
- }
- return mensaje;
- }
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