Move modules to Modules folder.

Modules/RSDatabase/Sources/RSDatabase/Database.swift

@@ -0,0 +1,53 @@
+//
+//  Database.swift
+//  RSDatabase
+//
+//  Created by Brent Simmons on 12/15/19.
+//  Copyright © 2019 Brent Simmons. All rights reserved.
+//
+
+import Foundation
+import RSDatabaseObjC
+
+public enum DatabaseError: Error {
+	case isSuspended // On iOS, to support background refreshing, a database may be suspended.
+}
+
+/// Result type that provides an FMDatabase or a DatabaseError.
+public typealias DatabaseResult = Result<FMDatabase, DatabaseError>
+
+/// Block that executes database code or handles DatabaseQueueError.
+public typealias DatabaseBlock = (DatabaseResult) -> Void
+
+/// Completion block that provides an optional DatabaseError.
+public typealias DatabaseCompletionBlock = (DatabaseError?) -> Void
+
+/// Result type for fetching an Int or getting a DatabaseError.
+public typealias DatabaseIntResult = Result<Int, DatabaseError>
+
+/// Completion block for DatabaseIntResult.
+public typealias DatabaseIntCompletionBlock = (DatabaseIntResult) -> Void
+
+// MARK: - Extensions
+
+public extension DatabaseResult {
+	/// Convenience for getting the database from a DatabaseResult.
+	var database: FMDatabase? {
+		switch self {
+		case .success(let database):
+			return database
+		case .failure:
+			return nil
+		}
+	}
+
+	/// Convenience for getting the error from a DatabaseResult.
+	var error: DatabaseError? {
+		switch self {
+		case .success:
+			return nil
+		case .failure(let error):
+			return error
+		}
+	}
+}