diff --git a/OlympusServices/app/src/androidTest/java/com/uottawa/olympus/olympusservices/DBTest.java b/OlympusServices/app/src/androidTest/java/com/uottawa/olympus/olympusservices/DBTest.java
new file mode 100644
index 0000000..c372bd8
--- /dev/null
+++ b/OlympusServices/app/src/androidTest/java/com/uottawa/olympus/olympusservices/DBTest.java
@@ -0,0 +1,80 @@
+package com.uottawa.olympus.olympusservices;
+
+import android.content.Context;
+import android.database.DatabaseUtils;
+import android.database.sqlite.SQLiteDatabase;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+@RunWith(AndroidJUnit4.class)
+public class DBTest {
+    private DBHelper dbHelper = new DBHelper(InstrumentationRegistry.getTargetContext());
+
+    @Test
+    public void testAddAndDeleteUser(){
+        UserType originalUser, dbUser;
+        boolean deleted;
+
+        originalUser = new Admin();
+        dbHelper.addUser(originalUser);
+        dbUser = dbHelper.findUserByUsername("admin");
+
+        assertEquals("Admin", dbUser.getClass().getSimpleName());
+        assertEquals("admin", dbUser.getUsername());
+        assertEquals("admin", dbUser.getPassword());
+        assertEquals("admin", dbUser.getFirstname());
+        assertEquals("admin", dbUser.getLastname());
+
+
+        originalUser = new User("mgarzon", "soccer", "Miguel", "Garzon");
+        dbHelper.addUser(originalUser);
+        dbUser = dbHelper.findUserByUsername("mgarzon");
+
+        assertEquals("User", dbUser.getClass().getSimpleName());
+        assertEquals("mgarzon", dbUser.getUsername());
+        assertEquals("soccer", dbUser.getPassword());
+        assertEquals("Miguel", dbUser.getFirstname());
+        assertEquals("Garzon", dbUser.getLastname());
+
+
+        originalUser = new ServiceProvider("jguzman", "seg2105", "Juan", "Guzman");
+        dbHelper.addUser(originalUser);
+        dbUser = dbHelper.findUserByUsername("jguzman");
+
+        assertEquals("ServiceProvider", dbUser.getClass().getSimpleName());
+        assertEquals("jguzman", dbUser.getUsername());
+        assertEquals("seg2105", dbUser.getPassword());
+        assertEquals("Juan", dbUser.getFirstname());
+        assertEquals("Guzman", dbUser.getLastname());
+
+
+        deleted = dbHelper.deleteUser("admin");
+        assertEquals(true, deleted);
+
+        deleted = dbHelper.deleteUser("mgarzon");
+        assertEquals(true, deleted);
+
+        deleted = dbHelper.deleteUser("jguzman");
+        assertEquals(true, deleted);
+
+    }
+
+
+    @Test
+    public void testAddDuplicateUsers(){
+        boolean added;
+
+        added = dbHelper.addUser(new User("mgarzon", "soccer", "Miguel", "Garzon"));
+        assertTrue(added);
+        added = dbHelper.addUser(new ServiceProvider("mgarzon", "soccer", "Miguel", "Garzon"));
+        assertTrue(!added);
+
+        dbHelper.deleteUser("mgarzon");
+    }
+
+}
diff --git a/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/Admin.java b/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/Admin.java
index ca2e6b0..b10f901 100644
--- a/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/Admin.java
+++ b/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/Admin.java
@@ -1,4 +1,8 @@
 package com.uottawa.olympus.olympusservices;
 
 public class Admin extends UserType {
+
+    Admin(){
+        super("admin", "admin", "admin", "admin");
+    }
 }
diff --git a/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/DBHelper.java b/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/DBHelper.java
new file mode 100644
index 0000000..2086573
--- /dev/null
+++ b/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/DBHelper.java
@@ -0,0 +1,146 @@
+package com.uottawa.olympus.olympusservices;
+
+import android.content.Context;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+import android.database.Cursor;
+import android.content.ContentValues;
+
+
+public class DBHelper extends SQLiteOpenHelper {
+
+    private static final int DB_VERSION = 1;
+    private static final String DB_NAME = "UsersDB.db";
+    private static String DB_PATH = "";
+    private static SQLiteDatabase readDB;
+    private static SQLiteDatabase writeDB;
+
+
+    private static final String TABLE_LOGIN = "userInfo";
+    private static final String COLUMN_USERNAME = "username";
+    private static final String COLUMN_PASSWORD = "password";
+    private static final String COLUMN_FIRSTNAME = "firstName";
+    private static final String COLUMN_LASTNAME = "lastName";
+    private static final String COLUMN_USERTYPE = "userType";
+
+//    private static final String TABLE_SERVICEPROVIDERS = "serviceProviders";
+
+
+//    private static final String TABLE_SERVICES = "services";
+
+
+    public DBHelper(Context context){
+        super(context, DB_NAME, null, DB_VERSION);
+        readDB = this.getReadableDatabase();
+        writeDB = this.getWritableDatabase();
+    }
+
+    @Override
+    public void onCreate(SQLiteDatabase db){
+
+        String CREATE_LOGIN_TABLE = "CREATE TABLE "+ TABLE_LOGIN + "("
+                + COLUMN_USERNAME + " STRING UNIQUE NOT NULL PRIMARY KEY ON CONFLICT ROLLBACK,"
+                + COLUMN_PASSWORD + " STRING NOT NULL,"
+                + COLUMN_FIRSTNAME + " STRING DEFAULT 'FirstName',"
+                + COLUMN_LASTNAME + " STRING DEFAULT 'LastName',"
+                + COLUMN_USERTYPE + " STRING NOT NULL" + ")";
+
+        db.execSQL(CREATE_LOGIN_TABLE);
+
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
+        db.execSQL("DROP TABLE IF EXISTS " + TABLE_LOGIN);
+        onCreate(db);
+    }
+
+    @Override
+    public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+        onUpgrade(db, oldVersion, newVersion);
+    }
+
+
+    public boolean addUser(UserType userType){
+        //Check for duplicate username by querying login table
+        Cursor cursor = writeDB.query(TABLE_LOGIN,
+                                new String[] {COLUMN_USERNAME},
+                                COLUMN_USERNAME + " = ?",
+                                new String[]{userType.getUsername()},
+                                null, null, null,
+                                "1");
+        //If cursor has 1+ elements in it, username already exists in table
+        if (cursor != null && cursor.getCount() > 0)
+            return false;
+        cursor.close();
+
+        ContentValues values = new ContentValues();
+        values.put(COLUMN_USERNAME, userType.getUsername());
+        values.put(COLUMN_PASSWORD, userType.getPassword());
+        values.put(COLUMN_FIRSTNAME, userType.getFirstname());
+        values.put(COLUMN_LASTNAME, userType.getLastname());
+        values.put(COLUMN_USERTYPE, userType.getClass().getSimpleName());
+        writeDB.insert(TABLE_LOGIN, null, values);
+        return true;
+    }
+
+
+    public UserType findUserByUsername(String username){
+        UserType usertype;
+        Cursor cursor = readDB.rawQuery("SELECT * FROM " + TABLE_LOGIN
+                                    + " WHERE " + COLUMN_USERNAME + " = ?",
+                                    new String[]{username});
+
+        if (cursor.moveToFirst()){
+            String password = cursor.getString(1);
+            String firstname = cursor.getString(2);
+            String lastname = cursor.getString(3);
+            if (cursor.getString(4)
+                    .equals("Admin")){
+                usertype = new Admin();
+            } else if (cursor.getString(4)
+                    .equals("ServiceProvider")){
+                usertype = new ServiceProvider(username, password, firstname, lastname);
+            } else {
+                usertype = new User(username, password, firstname, lastname);
+            }
+        } else {
+            usertype = null;
+        }
+        cursor.close();
+        return usertype;
+    }
+
+
+    public boolean updateUser(String username, String password, String firstname, String lastname){
+        ContentValues values = new ContentValues();
+        values.put(COLUMN_PASSWORD, password);
+        values.put(COLUMN_FIRSTNAME, firstname);
+        values.put(COLUMN_LASTNAME, lastname);
+
+        return writeDB.update(TABLE_LOGIN, values, COLUMN_USERNAME+" = ?",
+                new String[]{username}) > 0;
+
+    }
+
+
+    public boolean deleteUser(String username) {
+        return writeDB.delete(TABLE_LOGIN,  COLUMN_USERNAME+" = ?",
+                new String[]{username}) > 0;
+    }
+
+    public void printTable(String tableName){
+        Cursor cursor = readDB.rawQuery("SELECT * FROM "+tableName, null);
+        cursor.moveToFirst();
+        for (int i = 0; i<cursor.getCount(); i++){
+            String[] columns = cursor.getColumnNames();
+            for (String name: columns) {
+                System.out.print(cursor.getString(cursor.getColumnIndex(name))+" ");
+            }
+            System.out.println();
+            cursor.moveToNext();
+        }
+        cursor.close();
+    }
+
+}
\ No newline at end of file
diff --git a/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/ServiceProvider.java b/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/ServiceProvider.java
index 6f596a7..3931dfb 100644
--- a/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/ServiceProvider.java
+++ b/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/ServiceProvider.java
@@ -1,4 +1,9 @@
 package com.uottawa.olympus.olympusservices;
 
 public class ServiceProvider extends UserType {
+
+    ServiceProvider(String username, String password, String firstname, String lastname){
+        super(username, password, firstname, lastname);
+    }
+
 }
diff --git a/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/User.java b/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/User.java
index 4403f08..ca8cf71 100644
--- a/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/User.java
+++ b/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/User.java
@@ -1,4 +1,9 @@
 package com.uottawa.olympus.olympusservices;
 
 public class User extends UserType {
+
+    User(String username, String password, String firstname, String lastname){
+        super(username, password, firstname, lastname);
+    }
+
 }
diff --git a/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/UserType.java b/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/UserType.java
index e7aad5d..550b4e7 100644
--- a/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/UserType.java
+++ b/OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/UserType.java
@@ -1,12 +1,67 @@
 package com.uottawa.olympus.olympusservices;
 
-public class UserType {
-    String firstname;
-    String lastname;
+
+public abstract class UserType {
     String username;
     String password;
+    String firstname;
+    String lastname;
+
 
     UserType(){
 
     }
+
+    UserType(String username, String password, String firstname, String lastname){
+        this.username = username;
+        this.password = password;
+        this.firstname = firstname;
+        this.lastname = lastname;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public String getFirstname() {
+        return firstname;
+    }
+
+    public String getLastname() {
+        return lastname;
+    }
+
+
+    public void setUsername(String username) {
+        //remember to call updateUser(String username, String password, String firstname, String lastname)
+        //in activity whenever a setter is called. DBHelper requires a Context (Activity) to be initialized
+        //so cannot be initialized in this class
+        this.username = username;
+
+    }
+
+    public void setPassword(String password) {
+        //remember to call updateUser(String username, String password, String firstname, String lastname)
+        //in activity whenever a setter is called. DBHelper requires a Context (Activity) to be initialized
+        //so cannot be initialized in this class
+        this.password = password;
+    }
+
+    public void setFirstname(String firstname) {
+        //remember to call updateUser(String username, String password, String firstname, String lastname)
+        //in activity whenever a setter is called. DBHelper requires a Context (Activity) to be initialized
+        //so cannot be initialized in this class
+        this.firstname = firstname;
+    }
+
+    public void setLastname(String lastname) {
+        //remember to call updateUser(String username, String password, String firstname, String lastname)
+        //in activity whenever a setter is called. DBHelper requires a Context (Activity) to be initialized
+        //so cannot be initialized in this class
+        this.lastname = lastname;
+    }
 }