Android SQLite get a single row from table

Prerequisite

If you not understand this lecture. Android SQLite get a single row from table.You should also read my previous lectures  Android how can add data into SQLite and Android SQLite how can retrieve data. After reading these lecture you will also able retrieve a single row from database.

Introduction

In this lecture well we describe how can retrieve a single row from Database in android studio.And also describe what is SQLite.why we can use it.After Reading this lecture you will understand how can Retrieve single row from Database in android And i hope you will create Database of your application and also retrieve single row from database after reading this series.

What is SQLite

SQLite is a embedded (RDBMS) Stand for Relation Database Management system.Most relation database such as ORA-CAL and SQL are example that are working independently and store the information .SQLite is referred to as embedded because it is provided in the form of a library that is linked into applications.The code for SQLite is in the public domain and is thus free for use for any purpose, commercial or private.There is no sever that are running in the background.All the Database function are perform internally.

Description of Retrieve of Single row

In previous lecture we will get all the information from database.But in this lecture we will get only one row from database.For get a one row form a database we use some condition with where clause.First of all we create project in android studio.Every project contain two file first is java class file and second is layout XML file.And open a layout .XML file and add Edit text and button in layout.XML.When user enter a particular name for search and click on button the email and phone number related to name are appears .In a first lecture we describe how can create table and database and second lecture we describe how can retrieve all the information in database.But in this lecture we will retrieve a single row from a database.So this is a work that will done this section.please read this lecture carefully all the detail is provides step by step.For more detail about android sqlite please click on Android SQLite get a single row from tabl

Layout XML BASIC

XML Layout 

First of you will open a XML file of layout and set Linear Layout  and add  Edit text

Different property that are used in layout.xml file  explain here

• warp_content   warp_content means height and width similar to the text that are entered.
• Match_parent   means height and width similar to parent.
• Edit text              The Edit Text control allows a user to enter text into an application
• Button                  When user click on a button show information

 And Write the following code in Activity_main.XML file

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".LinearLayout"
android:background="#000000"
    >

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="sendMessage"
    android:text="@string/button1"
    android:layout_gravity="center"
    />

    <Button
        android:id="@+id/view_data"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="showData"
        android:text="@string/view_data"
        android:layout_gravity="center"
        />
    <Button
        android:id="@+id/search_data"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="ViewData"
        android:text="@string/search_data"
        android:layout_gravity="center"
        />

</LinearLayout>

         Now we create a new Layout.

• Step 1=<- create a new Layout name Search_content_layout.XML->Right click> the ->layout folder-> select ->New option-> and click ->layout resource folder->
• Step2=Step1->WriteName->Ok
• In this example we are going to create a simple UI that includes only (Text  view)  with Different attributes.And Write the following code into Search_content_Layout.XML file

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#A47DED"
    >
    <EditText
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:id="@+id/search_name"
        android:layout_alignParentLeft="true"
        android:hint="Enter name"
        />
    <Button
        android:layout_width="125dp"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_toRightOf="@+id/search_name"
        android:text="Search"
        android:onClick="SearchContant"

        />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="100dp"
        android:text="Email Here"
        android:id="@+id/display_email"
        android:layout_below="@+id/search_name"
        android:textAppearance="?android:textAppearanceLarge"
         />

    <TextView

        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/display_mobile"
        android:layout_marginTop="50dp"
        android:text="Mobile Here"
        android:layout_below="@+id/display_email"
        android:textAppearance="?android:textAppearanceLarge"
        />

</RelativeLayout>

• Step3=Create new class <-SearchContantActivity ->Right click-> the ->package name ->select ->New option-> and click-> java class that will show in below. 
• <-WriteName->Ok

      And Write the following code SearchContantActivity. java class

package customspinner.alienslab.com.adddata;

import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

 */
public class SearchContantActivity extends ActionBarActivity {
    TextView Display_email,Display_mobile;
    EditText Search_name;
    UserDbHelper userDbHelper;
    SQLiteDatabase sqLiteDatabase;
    String search_name;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.search_contant_layout);
        Search_name=(EditText)findViewById(R.id.search_name);
        Display_mobile=(TextView)findViewById(R.id.display_mobile);
        Display_email=(TextView)findViewById(R.id.display_email);
        Display_email.setVisibility(View.GONE);
        Display_mobile.setVisibility(View.GONE);
    }
    public void SearchContant(View view){
        search_name=Search_name.getText().toString();
        userDbHelper=new UserDbHelper(getApplicationContext());
        sqLiteDatabase=userDbHelper.getReadableDatabase();
        Cursor cursor=userDbHelper.getContact(search_name,sqLiteDatabase);
        if(cursor.moveToFirst())
        {
            String MOBILE=cursor.getString(0);
            String EMALL=cursor.getString(1);
            Display_mobile.setText(MOBILE);
            Display_email.setText(EMALL);
            Display_email.setVisibility(view.VISIBLE);
            Display_mobile.setVisibility(view.VISIBLE);


        }

    }
}

         Now we create a new class

• Step4=Create new class <-UserDbHandler ->Right click-> the ->package name ->select ->New option-> and click-> java class that will show in above. 
•  Step5=Step4->WriteName->Ok

         And Write the following code UserDbHandler. java class

package customspinner.alienslab.com.adddata;

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

/**
 * Created by  on 6/22/2015.
 */
public class UserDbHelper extends SQLiteOpenHelper {
    private static final String DATABASE_NAME = "USERINFO.DB";
    private static final int DATABASE_VERSION = 5;
    private static final String CREATE_QUERY = "CREATE TABLE " + UserContract.NewUserInfo.TABLE_NAME + "(id INTEGER, " +
            UserContract.NewUserInfo.USER_NAME + " TEXT, " + UserContract.NewUserInfo.USER_MOB + " TEXT, "
            + UserContract.NewUserInfo.USER_EMAIL + " TEXT );";


    public UserDbHelper(Context context) {

        super(context, DATABASE_NAME, null, DATABASE_VERSION);
        Log.e("DATABASE OPERATION", "Database created / opened.....");

    }

    @Override
    public void onCreate(SQLiteDatabase db) {

        db.execSQL(CREATE_QUERY);
        Log.e("DATABASE OPERATION", "Table create..." + CREATE_QUERY);
    }

    public void addinnformation(String name, String mob, String email, SQLiteDatabase db) {

        ContentValues contentValue = new ContentValues();
        contentValue.put(UserContract.NewUserInfo.USER_NAME, name);
        contentValue.put(UserContract.NewUserInfo.USER_MOB, mob);
        contentValue.put(UserContract.NewUserInfo.USER_EMAIL, email);
        db.insert(UserContract.NewUserInfo.TABLE_NAME, null, contentValue);
        Log.e("DATABASE OPERATION", "One row is insert");

    }

    public Cursor getinformation(SQLiteDatabase db) {
        Cursor cursor;
        String[] projections = {UserContract.NewUserInfo.USER_NAME, UserContract.NewUserInfo.USER_MOB, UserContract.NewUserInfo.USER_EMAIL};
        cursor = db.query(UserContract.NewUserInfo.TABLE_NAME, projections, null, null, null, null, null);
        return cursor;
   }

    public Cursor getContact(String user_name, SQLiteDatabase sqLiteDatabase) {
        String[] projections = {UserContract.NewUserInfo.USER_MOB, UserContract.NewUserInfo.USER_EMAIL};
        String selection = UserContract.NewUserInfo.USER_NAME+" LIKE ?";
        String[] seletion_args={user_name};
        Cursor cursor=sqLiteDatabase.query(UserContract.NewUserInfo.TABLE_NAME,projections,selection,seletion_args,null,null,null);
        return cursor;

}
    @Override

    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}

And Write the following code MainActivity. java class

package customspinner.alienslab.com.adddata;

import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;


public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }


    public void sendMessage(View view)
    {
        Intent intent = new Intent(MainActivity.this,NewContactActivity.class);
        startActivity(intent);
    }

    public void showData(View view)
    {
        Intent i = new Intent(MainActivity.this,DataListActivity.class);
        startActivity(i);
    }

    public void ViewData(View view)
    {
        Intent r = new Intent(MainActivity.this,SearchContantActivity.class);
        startActivity(r);
    }

    @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_main, 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);
    }
}

Run the Application

Run the application and if you click on a first button then a new activity will open. This activity consists of three Edit text  and a button .When user add information click on Save button then all the information will saved in database.And if you click on second button then a new activity will open and show all the information that are save in database.And if you click on third button a new activity will open.And user enter a particular name for search  and click on button the email and phone number related to name are appears .

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