Initial backend

backend/src/main/java/achievements/services/DbConnectionService.java

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+package achievements.services;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+import javax.annotation.PostConstruct;
+import javax.annotation.PreDestroy;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import com.microsoft.sqlserver.jdbc.SQLServerDataSource;
+
+@Component
+public class DbConnectionService {
+
+	private Connection connection;
+
+	@Value("${database.server}")
+	private String serverName;
+	@Value("${database.name}")
+	private String databaseName;
+	@Value("${database.user.name}")
+	private String username;
+	@Value("${database.user.password}")
+	private String password;
+
+	public DbConnectionService() {}
+
+	@PostConstruct
+	public void connect() {
+		try {
+			var dataSource = new SQLServerDataSource();
+			dataSource.setServerName  (serverName  );
+			dataSource.setDatabaseName(databaseName);
+			dataSource.setUser        (username    );
+			dataSource.setPassword    (password    );
+			connection = dataSource.getConnection();
+		} catch (SQLException e) {
+			e.printStackTrace();
+		}
+	}
+
+	public Connection getConnection() {
+		return this.connection;
+	}
+
+	@PreDestroy
+	public void disconnect() {
+		try {
+			if (connection != null) {
+				connection.close();
+			}
+		} catch (SQLException e) {
+			e.printStackTrace();
+		}
+	}
+}

backend/src/main/java/achievements/services/DbService.java

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+package achievements.services;
+
+import achievements.data.Achievements;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import javax.annotation.PostConstruct;
+import java.sql.Connection;
+import java.sql.SQLException;
+
+@Service
+public class DbService {
+
+	@Autowired
+	private DbConnectionService dbs;
+	private Connection db;
+
+	@PostConstruct
+	private void init() {
+		db = dbs.getConnection();
+	}
+
+	public Achievements getAchievements() {
+		final String QUERY = "SELECT * FROM [dbo].[Achievement]";
+
+		try {
+			var statement    = db.createStatement();
+			var achievements = new Achievements();
+			var queryResults = statement.executeQuery(QUERY);
+
+			while (queryResults.next()) {
+				achievements.getAchievements().add(new Achievements.Achievement(
+					queryResults.getInt("GameID"),
+					queryResults.getString("Name"),
+					queryResults.getString("Description"),
+					queryResults.getInt("Stages")
+				));
+			}
+
+			statement.close();
+			return achievements;
+		} catch (SQLException e) {
+			e.printStackTrace();
+			return null;
+		}
+	}
+}