19 SQLIte SImple Database Example

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Algorithm: 
Step 1)Create an Android Studio Project named as SQLiteCURD.
Step 2) open activity_main.xml and design UI page.
Step 3)Create a database Helper class named as DB_Controller which extends SQLiteOpenHelper .
It is abstract class so we need to implement the abstract methods 
 1)onCreate()
 2)onUpgrade() and
 3)constructor for helper class as follows

 
public class DB_Controller extends SQLiteOpenHelper 
{ 
 //constructor
  public DB_Controller(@androidx.annotation.Nullable Context context, @androidx.annotation.Nullable String name, @androidx.annotation.Nullable SQLiteDatabase.CursorFactory factory, int version)
    {super(context, name, factory, version); 
     }
   @Override 
  public void onCreate(SQLiteDatabase db) { 
     }
   @Override      
  public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     }

}
 
Step 4) go to MainActivity class and create an object of SQLiteDatabase
 
 
   
Program:
 
activity_main.xml:
<RelativeLayout 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" 
 tools:context=".MainActivity">


    <TextView     
     android:id="@+id/textView4"
     android:layout_width="65dp"     
     android:layout_height="wrap_content"
     android:layout_alignParentStart="true"
     android:layout_alignParentTop="true"
     android:layout_marginStart="16dp" 
     android:layout_marginTop="47dp"
     android:text="UID" 
     tools:ignore="RtlCompat" />
 
 <TextView     
     android:id="@+id/textView" 
     android:layout_width="49dp"
     android:layout_height="wrap_content"
     android:layout_alignParentStart="true"
     android:layout_alignParentTop="true"
     android:layout_marginStart="17dp"
     android:layout_marginTop="114dp" 
     android:text="NAME"     
     tools:ignore="RtlCompat" />

    <TextView     
     android:id="@+id/textView2" 
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_alignParentStart="true"
     android:layout_alignParentTop="true"
     android:layout_marginStart="12dp" 
     android:layout_marginTop="181dp" 
     android:text="PASSWORD"     
     tools:ignore="RtlCompat" />

    <TextView     
     android:id="@+id/textView3"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_alignParentStart="true"
     android:layout_alignParentTop="true"
     android:layout_marginStart="21dp" 
     android:layout_marginTop="233dp" 
     android:text="EMAIL" 
     tools:ignore="RtlCompat" />

    <EditText     
      android:id="@+id/uid"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignBaseline="@+id/textView4"
      android:layout_alignParentTop="true"
      android:layout_alignParentEnd="true"
      android:layout_alignParentRight="true"
      android:layout_marginStart="25dp"
      android:layout_marginLeft="25dp"
      android:layout_marginTop="32dp"
      android:layout_marginEnd="63dp"
      android:layout_marginRight="63dp"
      android:layout_toEndOf="@+id/textView4"
      android:layout_toRightOf="@+id/textView4"     
      android:ems="10"
      android:inputType="textPersonName" />

    <EditText     
      android:id="@+id/name"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_above="@+id/password"
      android:layout_below="@+id/uid"
      android:layout_alignBaseline="@+id/textView"
      android:layout_alignParentEnd="true"
      android:layout_alignParentRight="true"
      android:layout_marginStart="37dp"
      android:layout_marginLeft="37dp"
      android:layout_marginTop="21dp"
      android:layout_marginEnd="66dp"
      android:layout_marginRight="66dp"
      android:layout_marginBottom="26dp"
      android:layout_toEndOf="@+id/textView"
      android:layout_toRightOf="@+id/textView"
      android:ems="10"   
      android:inputType="textPersonName" />

    <EditText     
     android:id="@+id/password"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_above="@+id/email"
     android:layout_alignParentEnd="true"
     android:layout_alignParentRight="true"
     android:layout_marginStart="15dp"
     android:layout_marginLeft="15dp"
     android:layout_marginTop="27dp"
     android:layout_marginEnd="66dp"
     android:layout_marginRight="66dp"
     android:layout_marginBottom="6dp"
     android:layout_toEndOf="@+id/textView2"
     android:layout_toRightOf="@+id/textView2"
     android:ems="10"     
     android:inputType="textPersonName"
     android:singleLine="true" />

    <EditText     
     android:id="@+id/email"   
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_alignParentEnd="true"
     android:layout_alignParentRight="true"
     android:layout_alignParentBottom="true"
     android:layout_marginStart="40dp"
     android:layout_marginLeft="40dp"
     android:layout_marginEnd="68dp"
     android:layout_marginRight="68dp" 
     android:layout_marginBottom="243dp"         
     android:layout_toEndOf="@+id/textView3"     
     android:layout_toRightOf="@+id/textView3"     
     android:ems="10"         
     android:inputType="textPersonName" />

    <Button     
      android:id="@+id/button"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentStart="true"
      android:layout_alignParentLeft="true"
      android:layout_alignParentBottom="true"
      android:layout_marginStart="58dp"
      android:layout_marginLeft="58dp"
      android:layout_marginTop="29dp"
      android:layout_marginBottom="166dp"
      android:text="ADD DATA" 
      android:onClick="addData"/>

    <Button     
     android:id="@+id/button2"
     android:layout_width="86dp"
     android:layout_height="50dp" 
     android:layout_alignBottom="@+id/button"
     android:layout_alignParentEnd="true"
     android:layout_alignParentRight="true"
     android:layout_marginStart="64dp"
     android:layout_marginLeft="64dp"
     android:layout_marginTop="31dp"
     android:layout_marginEnd="84dp"
     android:layout_marginRight="84dp"
     android:layout_marginBottom="-4dp"
     android:layout_toEndOf="@+id/button"
     android:layout_toRightOf="@+id/button"
     android:text="VIEW ALL" 
     android:onClick="viewAll"/>
 
  <Button     
     android:id="@+id/button3"
     android:layout_width="100dp"
     android:layout_height="wrap_content"
     android:layout_alignParentStart="true"
     android:layout_alignParentLeft="true"
     android:layout_alignParentBottom="true"
     android:layout_marginStart="51dp" 
     android:layout_marginLeft="51dp" 
     android:layout_marginEnd="65dp" 
     android:layout_marginRight="65dp"
     android:layout_marginBottom="68dp"
     android:layout_toStartOf="@+id/button4"
     android:layout_toLeftOf="@+id/button4"
     android:text="UPDATE"   
     android:onClick="update"/>

    <Button     
     android:id="@+id/button4"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_below="@+id/button2"
     android:layout_alignParentEnd="true"
     android:layout_alignParentRight="true"
     android:layout_alignParentBottom="true"
     android:layout_marginTop="51dp" 
     android:layout_marginEnd="80dp" 
     android:layout_marginRight="80dp"
     android:layout_marginBottom="65dp"
     android:text="DELETE" 
     android:onClick="delete"/>

</RelativeLayout>

 
MainActivity.java:
 
package com.example.basha.sqlitesimplecurd;

import android.app.AlertDialog;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;



public class MainActivity extends AppCompatActivity {
    DatabaseHelper myDb;
    EditText uid,name,password,email;

    @Override    
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        myDb = new DatabaseHelper(this);
        uid = (EditText)findViewById(R.id.uid);
        name = (EditText)findViewById(R.id.name);
        password = (EditText)findViewById(R.id.password);
        email = (EditText)findViewById(R.id.email);

    }

    public void showMessage(String title,String Message){
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setCancelable(true);
        builder.setTitle(title);
        builder.setMessage(Message);
        builder.show();
    }


    @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;
    }

    public void addData(View view) {
        boolean isInserted = myDb.insertData(name.getText().toString(),
                password.getText().toString(),
                email.getText().toString() );
        if(isInserted == true)
            Toast.makeText(MainActivity.this,"Data Inserted",Toast.LENGTH_LONG).show();
        else            Toast.makeText(MainActivity.this,"Data not Inserted",Toast.LENGTH_LONG).show();

    }

    public void viewAll(View view) {
        Cursor res = myDb.getAllData();
        if(res.getCount() == 0) {
            // show message           
         showMessage("Error","Nothing found");
            return;
        }

        StringBuffer buffer = new StringBuffer();
        while (res.moveToNext()) {
            buffer.append("Id :"+ res.getString(0)+"\n");
            buffer.append("Name :"+ res.getString(1)+"\n");
            buffer.append("Surname :"+ res.getString(2)+"\n");
            buffer.append("Marks :"+ res.getString(3)+"\n\n");
        }

        // Show all data        
       showMessage("Data",buffer.toString());
    }

    public void update(View view) {
        boolean isUpdate = myDb.updateData(uid.getText().toString(),
                name.getText().toString(),
                password.getText().toString(),email.getText().toString());
        if(isUpdate == true)
            Toast.makeText(MainActivity.this,
                    "Data Update",Toast.LENGTH_LONG).show();
        else            Toast.makeText(MainActivity.this,
                    "Data not Updated",Toast.LENGTH_LONG).show();
    }

    public void delete(View view) {
        Integer deletedRows = myDb.deleteData(uid.getText().toString());
        if(deletedRows > 0)
            Toast.makeText(MainActivity.this,
                    "Data Deleted",Toast.LENGTH_LONG).show();
        else            Toast.makeText(MainActivity.this,
                    "Data not Deleted",Toast.LENGTH_LONG).show();
    }
}

Helper class:
 
package com.example.basha.sqlitesimplecurd;

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

public class DatabaseHelper extends SQLiteOpenHelper {
    public static final String DATABASE_NAME = "useraccount.db";
    public static final String TABLE_NAME = "user_table";
    public static final String COL_1 = "UID";
    public static final String COL_2 = "NAME";
    public static final String COL_3 = "PASSWORD";
    public static final String COL_4 = "EMAIL";

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, 1);
    }

    @Override    
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table " + TABLE_NAME +
                " (ID INTEGER PRIMARY KEY AUTOINCREMENT,NAME TEXT,SURNAME TEXT,MARKS INTEGER)");
    }

    @Override    
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS "+TABLE_NAME);
        onCreate(db);
    }

    public boolean insertData(String name,String surname,String marks) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put(COL_2,name);
        contentValues.put(COL_3,surname);
        contentValues.put(COL_4,marks);
        long result = db.insert(TABLE_NAME,null ,contentValues);
        if(result == -1)
            return false;
        else            return true;
    }

    public Cursor getAllData() {
        SQLiteDatabase db = this.getWritableDatabase();
        Cursor res = db.rawQuery("select * from "+TABLE_NAME,null);
        return res;
    }

    public boolean updateData(String id,String name,String surname,String marks) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put(COL_1,id);
        contentValues.put(COL_2,name);
        contentValues.put(COL_3,surname);
        contentValues.put(COL_4,marks);
        db.update(TABLE_NAME, contentValues, "ID = ?",new String[] { id });
        return true;
    }

    public Integer deleteData (String id) {
        SQLiteDatabase db = this.getWritableDatabase();
        return db.delete(TABLE_NAME, "ID = ?",new String[] {id});
    }
}


 
OUTPUT:
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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