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SQLite DB Example Code.txt
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SQLite DB Example Code.txt
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####################################### acitivty_main XML Code #######################################
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Insert Table"
android:layout_gravity="center"
android:layout_marginTop="50dp"
android:textSize="25sp"
android:textStyle="bold"
android:textColor="@color/black"/>
<EditText
android:id="@+id/rollno"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter your roll no"
android:layout_marginHorizontal="20dp"
android:layout_marginTop="30dp"/>
<EditText
android:id="@+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter your name"
android:layout_marginHorizontal="20dp"
android:layout_marginTop="10dp"/>
<EditText
android:id="@+id/email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter your email id"
android:layout_marginHorizontal="20dp"
android:layout_marginTop="10dp"/>
<Button
android:id="@+id/insert_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Insert"
android:layout_marginTop="30dp"
android:layout_gravity="center"/>
<Button
android:id="@+id/update_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Update"
android:layout_marginTop="10dp"
android:layout_gravity="center"/>
<Button
android:id="@+id/delete_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Delete"
android:layout_marginTop="10dp"
android:layout_gravity="center"/>
</LinearLayout>
####################################### MainActivity Java Code #######################################
package com.example.dbconnectionexample;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
EditText rollno, name, email;
Button insert_btn, update_btn, delete_btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rollno= findViewById(R.id.rollno);
name= findViewById(R.id.name);
email= findViewById(R.id.email);
insert_btn= findViewById(R.id.insert_btn);
update_btn= findViewById(R.id.update_btn);
delete_btn= findViewById(R.id.delete_btn);
insert_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int rollno_num= Integer.parseInt(rollno.getText().toString());
String name_txt= name.getText().toString();
String email_txt= email.getText().toString();
DetailsDBHelper db= new DetailsDBHelper(getApplicationContext());
boolean insert_result= db.insertToDB(rollno_num, name_txt, email_txt);
if(insert_result){
Toast.makeText(MainActivity.this, "Inserted successfully.", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(MainActivity.this, "Insertion failed !!", Toast.LENGTH_SHORT).show();
}
}
});
update_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int rollno_num= Integer.parseInt(rollno.getText().toString());
String name_txt= name.getText().toString();
String email_txt= email.getText().toString();
DetailsDBHelper db= new DetailsDBHelper(getApplicationContext());
boolean update_result= db.updateToDB(rollno_num, name_txt, email_txt);
if(update_result){
Toast.makeText(MainActivity.this, "Updated successfully.", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(MainActivity.this, "Updation failed !!", Toast.LENGTH_SHORT).show();
}
}
});
delete_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int rollno_num= Integer.parseInt(rollno.getText().toString());
DetailsDBHelper db= new DetailsDBHelper(getApplicationContext());
boolean update_result= db.deleteFromDB(rollno_num);
if(update_result){
Toast.makeText(MainActivity.this, "Deleted successfully.", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(MainActivity.this, "Deletion failed !!", Toast.LENGTH_SHORT).show();
}
}
});
}
}
####################################### DetailsDBHelper Java Code (Database Code - Java) #######################################
package com.example.dbconnectionexample;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import androidx.annotation.Nullable;
public class DetailsDBHelper extends SQLiteOpenHelper {
public DetailsDBHelper(@Nullable Context context) { super(context, "MyDB", null, 1); }
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
sqLiteDatabase.execSQL("CREATE TABLE userdetails (rollno INTEGER PRIMARY KEY, name TEXT, email TEXT)");
}
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
sqLiteDatabase.execSQL("DROP TABLE IF EXISTS userdetails");
}
public boolean insertToDB(int rollno, String name, String email){
SQLiteDatabase db= this.getWritableDatabase();
ContentValues values= new ContentValues();
values.put("rollno",rollno);
values.put("name",name);
values.put("email",email);
long result= db.insert("userdetails",null,values);
if(result>=0){
return true;
}
else {
return false;
}
}
public boolean updateToDB(int rollno, String name, String email){
SQLiteDatabase db= this.getWritableDatabase();
ContentValues values= new ContentValues();
values.put("name",name);
values.put("email",email);
Cursor check_user= db.rawQuery("SELECT * from userdetails WHERE rollno=?",new String[]{String.valueOf(rollno)});
if(check_user.getCount() > 0){
long update_user_query= db.update("userdetails",values,"rollno=?",new String[]{String.valueOf(rollno)});
if(update_user_query >= 0){
return true;
}
else{
return false;
}
}
else{
return false;
}
}
public boolean deleteFromDB(int rollno){
SQLiteDatabase db= this.getWritableDatabase();
Cursor check_user= db.rawQuery("SELECT * FROM userdetails WHERE rollno=?",new String[]{String.valueOf(rollno)});
if(check_user.getCount() > 0){
long delete_user_query= db.delete("userdetails","rollno=?", new String[]{String.valueOf(rollno)});
if(delete_user_query >= 0){
return true;
}
else{
return false;
}
}
else{
return false;
}
}
}