Move modules to Modules folder.

Modules/RSDatabase/Sources/RSDatabaseObjC/NSString+RSDatabase.h

@@ -0,0 +1,36 @@
+//
+//  NSString+RSDatabase.h
+//	RSDatabase
+//
+//  Created by Brent Simmons on 3/27/15.
+//  Copyright (c) 2015 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface NSString (QSDatabase)
+
+
+/*Returns @"(?, ?, ?)" -- where number of ? spots is specified by numberOfValues.
+ numberOfValues should be greater than 0. Triggers an NSParameterAssert if not.*/
+
++ (nullable NSString *)rs_SQLValueListWithPlaceholders:(NSUInteger)numberOfValues;
+
+
+/*Returns @"(someColumn, anotherColumm, thirdColumn)" -- using passed-in keys.
+ It's essential that you trust keys. They must not be user input.
+ Triggers an NSParameterAssert if keys are empty.*/
+
++ (NSString *)rs_SQLKeysListWithArray:(NSArray *)keys;
+
+
+/*Returns @"key1=?, key2=?" using passed-in keys. Keys must be trusted.*/
+
++ (NSString *)rs_SQLKeyPlaceholderPairsWithKeys:(NSArray *)keys;
+
+
+@end
+
+NS_ASSUME_NONNULL_END