FMDB usage with swift - returning a boolean

Question

I am currently building an app in swift that uses FMDB to interact with a database that is stored on the device. I chose to use FMDB since I have experience using it with Object

Answer 1

From Adopting Cocoa Design Patterns in the "Using Swift with Cocoa and Objective-C" reference:

Swift automatically translates Objective-C methods that produce errors into methods that throw an error according to Swift’s native error handling functionality.

Therefore the Objective-C method

- (BOOL)executeUpdate:(NSString *)sql values:(NSArray *_Nullable)values error:(NSError *_Nullable __autoreleasing *)error

is mapped as

func executeUpdate(sql: String, values: [Any]?) throws 

into Swift, and must be called with (a variant of) try.

If you are only interested in the success/failure status, but not in the actual error message (as in your Objective code), then you can use try?, which evaluates to nil if the evaluation failed:

let success = (try? db.executeUpdate(sqlStatement, values: dataArray)) != nil