DatabaseHandler.java

package com.medantechno.arduinobluetooth;

/**
 * Created by user on 4/14/2017.
 */

import java.util.ArrayList;
import java.util.List;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;


public class DatabaseHandler extends  SQLiteOpenHelper{

    // All Static variables
    // Database Version
    private static final int DATABASE_VERSION = 1;

    // Database Name
    private static final String DATABASE_NAME = "codeManager";

    // Contacts table vName
    private static final String TBL_COMMAND = "command";

    // Contacts Table Columns names
    private static final String KEY_ID = "id";
    private static final String KEY_NAME = "vName";
    private static final String KEY_CODENYA = "codenya";

    public DatabaseHandler(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    // Creating Tables
    @Override
    public void onCreate(SQLiteDatabase db) {
        String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TBL_COMMAND + "("
                + KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
                + KEY_CODENYA + " TEXT" + ")";
        db.execSQL(CREATE_CONTACTS_TABLE);
    }

    // Upgrading database
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // Drop older table if existed
        db.execSQL("DROP TABLE IF EXISTS " + TBL_COMMAND);

        // Create tables again
        onCreate(db);
    }

    /**
     * All CRUD(Create, Read, Update, Delete) Operations
     */

    // Adding new command
    void addContact(Command command) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_NAME, command.getName()); // Command Name
        values.put(KEY_CODENYA, command.getCodenya()); // Command Phone

        // Inserting Row
        db.insert(TBL_COMMAND, null, values);
        db.close(); // Closing database connection
    }

    // Getting single command
    Command getContact(int id) {
        SQLiteDatabase db = this.getReadableDatabase();

        Cursor cursor = db.query(TBL_COMMAND, new String[] { KEY_ID,
                        KEY_NAME, KEY_CODENYA }, KEY_ID + "=?",
                new String[] { String.valueOf(id) }, null, null, null, null);
        if (cursor != null)
            cursor.moveToFirst();

        Command command = new Command(Integer.parseInt(cursor.getString(0)),
                cursor.getString(1), cursor.getString(2));
        // return command
        return command;
    }

    Command getById(String id) {
        SQLiteDatabase db = this.getReadableDatabase();

        Cursor cursor = db.query(TBL_COMMAND, new String[] { KEY_ID,
                        KEY_NAME, KEY_CODENYA }, KEY_ID + "=?",
                new String[] { id }, null, null, null, null);
        if (cursor != null)
            cursor.moveToFirst();

        Command command = new Command(Integer.parseInt(cursor.getString(0)),
                cursor.getString(1), cursor.getString(2));
        // return command
        return command;
    }


    Command getByKata(String kata) {
        SQLiteDatabase db = this.getReadableDatabase();

        Cursor cursor = db.query(TBL_COMMAND, new String[] { KEY_ID, KEY_NAME, KEY_CODENYA }, KEY_NAME + " like ?",
                new String[] { "%"+kata+"%" }, null, null, null, null);
        if (cursor != null)
            cursor.moveToFirst();

        Command command = new Command(Integer.parseInt(cursor.getString(0)),
                cursor.getString(1), cursor.getString(2));
        // return command
        return command;
    }






    // Getting All Contacts
    public List<Command> getAllContacts() {
        List<Command> contactList = new ArrayList<Command>();
        // Select All Query
        String selectQuery = "SELECT  * FROM " + TBL_COMMAND;

        SQLiteDatabase db = this.getWritableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);

        // looping through all rows and adding to list
        if (cursor.moveToFirst()) {
            do {
                Command command = new Command();
                command.setID(Integer.parseInt(cursor.getString(0)));
                command.setName(cursor.getString(1));
                command.setCodenya(cursor.getString(2));
                // Adding command to list
                contactList.add(command);
            } while (cursor.moveToNext());
        }

        // return command list
        return contactList;
    }

    // Updating single command
    public int updateContact(Command command) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_NAME, command.getName());
        values.put(KEY_CODENYA, command.getCodenya());

        // updating row
        return db.update(TBL_COMMAND, values, KEY_ID + " = ?",
                new String[] { String.valueOf(command.getID()) });
    }

    // Deleting single command
    public void deleteContact(Command command) {
        SQLiteDatabase db = this.getWritableDatabase();
        db.delete(TBL_COMMAND, KEY_ID + " = ?",
                new String[] { String.valueOf(command.getID()) });
        db.close();
    }


    // Getting command Count
    public int getContactsCount() {
        String countQuery = "SELECT  * FROM " + TBL_COMMAND;
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(countQuery, null);
        cursor.close();

        // return count
        return cursor.getCount();
    }


}