Swift 4 Protocol-Oriented Programming - Third Edition

Using the data access layer

Now, let's see how to use the data access layer by creating a team and a player:

var bos = Team( teamId: 0, city: "Boston", 
nickName: "Red Sox", abbreviation: "BOS") 
 
try? TeamBridge.save(&bos)  
var ortiz = Player( 
playerId: 0,firstName: "David", lastName: "Ortiz", number: 34, 
teamId: bos.teamId, position: Positions.designatedHitter)  
 
try? PlayerBridge.save(&ortiz) 

In this code, we created one team, the Boston Red Sox and one player, David Ortiz. We also put David Ortiz on the Boston Red Sox team, by assigning Red Sox team id to the player's team id. This information can now be retrieved, as shown in the following code:

if let team = try? TeamBridge.retrieve(0) { print("--- \(team?.city)") } if let player = try? ...