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Android SQLite Database Example Tutorial

Published on August 3, 2022
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By Anupam Chugh

Android SQLite Database Example Tutorial

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Welcome to Android SQLite Example Tutorial. Android SQLite is the mostly preferred way to store data for android applications. For many applications, SQLite is the apps backbone whether it’s used directly or via some third-party wrapper. Below is the final app we will create today using Android SQLite database. android sqlite example tutorial

Android SQLite

Android SQLite is a very lightweight database which comes with Android OS. Android SQLite combines a clean SQL interface with a very small memory footprint and decent speed. For Android, SQLite is “baked into” the Android runtime, so every Android application can create its own SQLite databases. Android SQLite native API is not JDBC, as JDBC might be too much overhead for a memory-limited smartphone. Once a database is created successfully its located in data/data//databases/ accessible from Android Device Monitor. SQLite is a typical relational database, containing tables (which consists of rows and columns), indexes etc. We can create our own tables to hold the data accordingly. This structure is referred to as a schema.

Android SQLite SQLiteOpenHelper

Android has features available to handle changing database schemas, which mostly depend on using the SQLiteOpenHelper class. SQLiteOpenHelper is designed to get rid of two very common problems.

  1. When the application runs the first time - At this point, we do not yet have a database. So we will have to create the tables, indexes, starter data, and so on.
  2. When the application is upgraded to a newer schema - Our database will still be on the old schema from the older edition of the app. We will have option to alter the database schema to match the needs of the rest of the app.

SQLiteOpenHelper wraps up these logic to create and upgrade a database as per our specifications. For that we’ll need to create a custom subclass of SQLiteOpenHelper implementing at least the following three methods.

  1. Constructor : This takes the Context (e.g., an Activity), the name of the database, an optional cursor factory (we’ll discuss this later), and an integer representing the version of the database schema you are using (typically starting from 1 and increment later).

    public DatabaseHelper(Context context) {
            super(context, DB_NAME, null, DB_VERSION);
        }
    
  2. onCreate(SQLiteDatabase db) : It’s called when there is no database and the app needs one. It passes us a SQLiteDatabase object, pointing to a newly-created database, that we can populate with tables and initial data.

  3. onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) : It’s called when the schema version we need does not match the schema version of the database, It passes us a SQLiteDatabase object and the old and new version numbers. Hence we can figure out the best way to convert the database from the old schema to the new one.

We define a DBManager class to perform all database CRUD(Create, Read, Update and Delete) operations.

Opening and Closing Android SQLite Database Connection

Before performing any database operations like insert, update, delete records in a table, first open the database connection by calling getWritableDatabase() method as shown below:

public DBManager open() throws SQLException {
        dbHelper = new DatabaseHelper(context);
        database = dbHelper.getWritableDatabase();
        return this;
    }

The dbHelper is an instance of the subclass of SQLiteOpenHelper. To close a database connection the following method is invoked.

 public void close() {
        dbHelper.close();
    }

Inserting new Record into Android SQLite database table

The following code snippet shows how to insert a new record in the android SQLite database.

public void insert(String name, String desc) {
        ContentValues contentValue = new ContentValues();
        contentValue.put(DatabaseHelper.SUBJECT, name);
        contentValue.put(DatabaseHelper.DESC, desc);
        database.insert(DatabaseHelper.TABLE_NAME, null, contentValue);
    }

Content Values creates an empty set of values using the given initial size. We’ll discuss the other instance values when we jump into the coding part.

Updating Record in Android SQLite database table

The following snippet shows how to update a single record.

public int update(long _id, String name, String desc) {
        ContentValues contentValues = new ContentValues();
        contentValues.put(DatabaseHelper.SUBJECT, name);
        contentValues.put(DatabaseHelper.DESC, desc);
        int i = database.update(DatabaseHelper.TABLE_NAME, contentValues, DatabaseHelper._ID + " = " + _id, null);
        return i;
    }

Android SQLite - Deleting a Record

We just need to pass the id of the record to be deleted as shown below.

public void delete(long _id) {
        database.delete(DatabaseHelper.TABLE_NAME, DatabaseHelper._ID + "=" + _id, null);
    }

Android SQLite Cursor

A Cursor represents the entire result set of the query. Once the query is fetched a call to cursor.moveToFirst() is made. Calling moveToFirst() does two things:

  • It allows us to test whether the query returned an empty set (by testing the return value)
  • It moves the cursor to the first result (when the set is not empty)

The following code is used to fetch all records:

 public Cursor fetch() {
        String[] columns = new String[] { DatabaseHelper._ID, DatabaseHelper.SUBJECT, DatabaseHelper.DESC };
        Cursor cursor = database.query(DatabaseHelper.TABLE_NAME, columns, null, null, null, null, null);
        if (cursor != null) {
            cursor.moveToFirst();
        }
        return cursor;
    }

Another way to use a Cursor is to wrap it in a CursorAdapter. Just as ArrayAdapter adapts arrays, CursorAdapter adapts Cursor objects, making their data available to an AdapterView like a ListView. Let’s jump to our project that uses SQLite to store some meaningful data.

Android SQLite Example Project Structure

android sqlite example tutorial project In this application we wish to create records that store Country names and their respective currencies in the form of a ListView. We cover all the features discusses above.

Android SQLite Project Code

The application consists of 5 classes. We begin with defining with DatabaseHelper, which is a subclass of SQLiteOpenHelper as follows: DatabaseHelper.java

package com.journaldev.sqlite;

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

public class DatabaseHelper extends SQLiteOpenHelper {

    // Table Name
    public static final String TABLE_NAME = "COUNTRIES";

    // Table columns
    public static final String _ID = "_id";
    public static final String SUBJECT = "subject";
    public static final String DESC = "description";

    // Database Information
    static final String DB_NAME = "JOURNALDEV_COUNTRIES.DB";

    // database version
    static final int DB_VERSION = 1;

    // Creating table query
    private static final String CREATE_TABLE = "create table " + TABLE_NAME + "(" + _ID
            + " INTEGER PRIMARY KEY AUTOINCREMENT, " + SUBJECT + " TEXT NOT NULL, " + DESC + " TEXT);";

    public DatabaseHelper(Context context) {
        super(context, DB_NAME, null, DB_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_TABLE);
    }

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

As discussed above we have overridden the onCreate() and onUpgrade() methods besides the constructor. We’ve assigned the names to the database and the table as JOURNALDEV_COUNTRIES.DB and COUNTRIES respectively. The index column is auto incremented whenever a new row is inserted. The column names for country and currency are “subject” and “description”. The DBManager classes is where the DatabaseHelper is initialized and the CRUD Operations are defined. Below is the code for this class: DBManager.java

package com.journaldev.sqlite;


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

public class DBManager {

    private DatabaseHelper dbHelper;

    private Context context;

    private SQLiteDatabase database;

    public DBManager(Context c) {
        context = c;
    }

    public DBManager open() throws SQLException {
        dbHelper = new DatabaseHelper(context);
        database = dbHelper.getWritableDatabase();
        return this;
    }

    public void close() {
        dbHelper.close();
    }

    public void insert(String name, String desc) {
        ContentValues contentValue = new ContentValues();
        contentValue.put(DatabaseHelper.SUBJECT, name);
        contentValue.put(DatabaseHelper.DESC, desc);
        database.insert(DatabaseHelper.TABLE_NAME, null, contentValue);
    }

    public Cursor fetch() {
        String[] columns = new String[] { DatabaseHelper._ID, DatabaseHelper.SUBJECT, DatabaseHelper.DESC };
        Cursor cursor = database.query(DatabaseHelper.TABLE_NAME, columns, null, null, null, null, null);
        if (cursor != null) {
            cursor.moveToFirst();
        }
        return cursor;
    }

    public int update(long _id, String name, String desc) {
        ContentValues contentValues = new ContentValues();
        contentValues.put(DatabaseHelper.SUBJECT, name);
        contentValues.put(DatabaseHelper.DESC, desc);
        int i = database.update(DatabaseHelper.TABLE_NAME, contentValues, DatabaseHelper._ID + " = " + _id, null);
        return i;
    }

    public void delete(long _id) {
        database.delete(DatabaseHelper.TABLE_NAME, DatabaseHelper._ID + "=" + _id, null);
    }

}

The CountryListActivity.java class is the activity which is launched when the application starts. Below is layout defined for it: fragment_emp_list.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="https://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:dividerHeight="1dp"
        android:padding="10dp" >
    </ListView>

    <TextView
        android:id="@+id/empty"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="@string/empty_list_text" />

</RelativeLayout>

Here a ListView component is defined to included the records stored in the database. Initially the ListView would be empty hence a TextView is used to display the same. CountryListActivity.java

package com.journaldev.sqlite;

import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.widget.SimpleCursorAdapter;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.TextView;

public class CountryListActivity extends ActionBarActivity {

    private DBManager dbManager;

    private ListView listView;

    private SimpleCursorAdapter adapter;

    final String[] from = new String[] { DatabaseHelper._ID,
            DatabaseHelper.SUBJECT, DatabaseHelper.DESC };

    final int[] to = new int[] { R.id.id, R.id.title, R.id.desc };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.fragment_emp_list);

        dbManager = new DBManager(this);
        dbManager.open();
        Cursor cursor = dbManager.fetch();

        listView = (ListView) findViewById(R.id.list_view);
        listView.setEmptyView(findViewById(R.id.empty));

        adapter = new SimpleCursorAdapter(this, R.layout.activity_view_record, cursor, from, to, 0);
        adapter.notifyDataSetChanged();

        listView.setAdapter(adapter);

        // OnCLickListiner For List Items
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long viewId) {
                TextView idTextView = (TextView) view.findViewById(R.id.id);
                TextView titleTextView = (TextView) view.findViewById(R.id.title);
                TextView descTextView = (TextView) view.findViewById(R.id.desc);

                String id = idTextView.getText().toString();
                String title = titleTextView.getText().toString();
                String desc = descTextView.getText().toString();

                Intent modify_intent = new Intent(getApplicationContext(), ModifyCountryActivity.class);
                modify_intent.putExtra("title", title);
                modify_intent.putExtra("desc", desc);
                modify_intent.putExtra("id", id);

                startActivity(modify_intent);
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();
        if (id == R.id.add_record) {

            Intent add_mem = new Intent(this, AddCountryActivity.class);
            startActivity(add_mem);

        }
        return super.onOptionsItemSelected(item);
    }

}

In this activity the DBManager object is invoked to perform the CRUD Operations. A SimpleCursorAdapter is defined to add elements to the list from the query results that are returned in an Cursor Object. On list item click an intent is performed to open the ModifyCountryActivity class. The menu contains an item to add a new record from the ActionBar. Here again an intent is performed to open the AddCountryActivity class. Below is menu.xml code. menu.xml

<menu xmlns:android="https://schemas.android.com/apk/res/android"
    xmlns:app="https://schemas.android.com/apk/res-auto"
    xmlns:tools="https://schemas.android.com/tools"
    tools:context="com.example.sqlitesample.MainActivity" >

    <item
        android:id="@+id/add_record"
        android:icon="@android:drawable/ic_menu_add"
        android:orderInCategory="100"
        android:title="@string/add_record"
        app:showAsAction="always"/>

</menu>

The xml layout and code of AddCountryActivity.java file are defined below: activity_add_record.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="https://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="20dp" >

    <EditText
        android:id="@+id/subject_edittext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="@string/enter_title" >

        <requestFocus />
    </EditText>

    <EditText
        android:id="@+id/description_edittext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="@string/enter_desc"
        android:inputType="textMultiLine"
        android:minLines="5" >
    </EditText>

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

</LinearLayout>

Two EditText components that take the inputs for country and currency along with a button to add the values to the database and display it in the ListView are defined. AddCountryActivity.java

package com.journaldev.sqlite;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class AddCountryActivity extends Activity implements OnClickListener {

    private Button addTodoBtn;
    private EditText subjectEditText;
    private EditText descEditText;

    private DBManager dbManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setTitle("Add Record");

        setContentView(R.layout.activity_add_record);

        subjectEditText = (EditText) findViewById(R.id.subject_edittext);
        descEditText = (EditText) findViewById(R.id.description_edittext);

        addTodoBtn = (Button) findViewById(R.id.add_record);

        dbManager = new DBManager(this);
        dbManager.open();
        addTodoBtn.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.add_record:

                final String name = subjectEditText.getText().toString();
                final String desc = descEditText.getText().toString();

                dbManager.insert(name, desc);

                Intent main = new Intent(AddCountryActivity.this, CountryListActivity.class)
                        .setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

                startActivity(main);
                break;
        }
    }

}

The CRUD operation performed here is adding a new record to the database. The xml layout and code of ModifyCountryActivity.java file are defined below: activity_modify_record.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="https://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="10dp" >

    <EditText
        android:id="@+id/subject_edittext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:ems="10"
        android:hint="@string/enter_title" />

    <EditText
        android:id="@+id/description_edittext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="@string/enter_desc"
        android:inputType="textMultiLine"
        android:minLines="5" >
    </EditText>


    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:weightSum="2"
        android:gravity="center_horizontal"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/btn_update"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/btn_update" />

        <Button
            android:id="@+id/btn_delete"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/btn_delete" />
    </LinearLayout>

</LinearLayout>

It’s similar to the previous layout except that modify and delete buttons are added. ModifyCountryActivity.java

package com.journaldev.sqlite;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class ModifyCountryActivity extends Activity implements OnClickListener {

    private EditText titleText;
    private Button updateBtn, deleteBtn;
    private EditText descText;

    private long _id;

    private DBManager dbManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setTitle("Modify Record");

        setContentView(R.layout.activity_modify_record);

        dbManager = new DBManager(this);
        dbManager.open();

        titleText = (EditText) findViewById(R.id.subject_edittext);
        descText = (EditText) findViewById(R.id.description_edittext);

        updateBtn = (Button) findViewById(R.id.btn_update);
        deleteBtn = (Button) findViewById(R.id.btn_delete);

        Intent intent = getIntent();
        String id = intent.getStringExtra("id");
        String name = intent.getStringExtra("title");
        String desc = intent.getStringExtra("desc");

        _id = Long.parseLong(id);

        titleText.setText(name);
        descText.setText(desc);

        updateBtn.setOnClickListener(this);
        deleteBtn.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_update:
                String title = titleText.getText().toString();
                String desc = descText.getText().toString();

                dbManager.update(_id, title, desc);
                this.returnHome();
                break;

            case R.id.btn_delete:
                dbManager.delete(_id);
                this.returnHome();
                break;
        }
    }

    public void returnHome() {
        Intent home_intent = new Intent(getApplicationContext(), CountryListActivity.class)
                .setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(home_intent);
    }
}

The CRUD operations performed here are updating and deleting a record. The below images are the screenshots of the final output of our project. The first image is the output seen when the application is launched for the first time. android sqlite The second image is the result of clicking the menu option from the ActionBar to add a new record as shown below. android sqlite example create The third image shows an output when 3 records are added : android sqlite example crud The fourth image shows the output when any list item is clicked to modify or delete a record : android sqlite example update The final image is the output when a record is deleted. In this example we delete the first record : android sqlite example delete

Opening the Android SQLite Database file

As we’ve discussed earlier in this tutorial, the database file is stored in the internal storage that is accessible from the Android Device Monitor as visible in the pic below. android sqlite adm To view this database we need to pull this file from the device to our desktop. This is done by clicking the menu option in the top right as seen in the image below : android sqlite pull file from device To open this file download the SQLiteBrowser from this link. The snippets below show the schema and tables in the browser. android sqlite database sqlitebrowser To view the table go to the Browse Data tab on top. The following image is seen: android sqlite database table This brings an end to Android SQLite tutorial. The final Android SQLite Project is downloadable from the below link.

Download Android SQLite Example Project

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Anupam Chugh

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JournalDev
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April 28, 2021

final int[] to = new int[] { R.id.id, R.id.title, R.id.desc }; can’t findany where these resource ids ---- id, title, desc shows error

- sahid

    JournalDev
    DigitalOcean Employee
    DigitalOcean Employee badge
    April 28, 2021

    activity_view_record.xml (layout file is not found. adapter = new SimpleCursorAdapter(this, R.layout.activity_view_record, cursor, from, to, 0); adapter.notifyDataSetChanged(); Please let me know the layout coding. Thank you

    - sahid

      JournalDev
      DigitalOcean Employee
      DigitalOcean Employee badge
      November 11, 2020

      I have run and installed it successfully but can’t find the project’s package in sdcard

      - phongdc

        JournalDev
        DigitalOcean Employee
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        August 21, 2020

        Sir when i click list items my ModyfyActivity does not open, i have added intent for it,but still not working.Please suggest

        - Sitansu

          JournalDev
          DigitalOcean Employee
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          August 19, 2020

          Hey,Can you please tell me where is the activity_view_record,that you add in CountryListActivity?

          - Sitansu

            JournalDev
            DigitalOcean Employee
            DigitalOcean Employee badge
            May 16, 2020

            What to do when i have a custom adapter with multiple list view and I want to convert it into customcursoradapter. Actually I am using recyclerview with multiple ArrayList of TextView.

            - HIRAL PATEL

              JournalDev
              DigitalOcean Employee
              DigitalOcean Employee badge
              May 11, 2020

              Thank you very much, it’s a awesome tutorial, i managed to handle datas. Great!

              - fgoraz

                JournalDev
                DigitalOcean Employee
                DigitalOcean Employee badge
                January 7, 2020

                Hi you all, Got Anupam’s code running, with a vew minor adjustments. These are the problems I encountered and the changes I made. Problem 1 Android Studio, version 3.5.3, had trouble running the code. AS recommended migrating to Gradle. That did not work. I’m curious, Anupam, if you are not using AS, what are you using? Solution Create a new application. Copy and paste Anupam’s code to: app/src/main/AndroidManefest.xml app/src/main/res/layout/activity_add_record.xml app/src/main/res/layout/activity_veiw_record.xml app/src/main/res/layout/activity_modify_record.xml app/src/main/res/layout/activity_emp_list.xml app/src/main/res/layout/activity_main.xml app/src/main/res/menu/main.xml //had to create this directory app/src/main/java/com/example/yourapplicationname/AddCountryActivity.java app/src/main/java/com/example/yourapplicationname/ModifyCountryActivity.java app/src/main/java/com/example/yourapplicationname/CountryListActivity.java app/src/main/java/com/example/yourapplicationname/DatabaseHelper.java app/src/main/java/com/example/yourapplicationname/DbManager.java app/src/main/java/com/example/yourapplicationname/MainActivity.java //Anupam’s project structure did not list this file, but we seem to need it for app/src/main/res/menu/main.xml Problem 2 AS did not recognize ActionBarActivity in CountryListActivity.java. public class CountryListActivity extends ActionBarActivity { The version of AS I’m using requires androix dependency. import android.support.v7.app.ActionBarActivity; is no longer supported. Solution First, check that the following is listed in dependencies in the build.gradle (Module: app) file. implementation ‘androidx.appcompat:appcompat:1.0.2’ If it’s not there, copy and paste this line in. Or, better yet, update your AS. Second, replace ActionBarActivity with AppCompatActivity in CountryListActivity.java public class CountryListActivity extends AppCompatActivity { That should do it. Good luck everybody and thank you Anupam Chungh. I also love learning new stuff in Android.

                - LJB

                  JournalDev
                  DigitalOcean Employee
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                  January 5, 2020

                  Thanks Anupam. This was helpful.

                  - Siddharth

                    JournalDev
                    DigitalOcean Employee
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                    January 5, 2020

                    Anupam, just read your very thorough and easy to understand post. Looking forward to running your code and learning new things. LJB

                    - LJB

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