Я начинающий для Swift и FMDB, я получил код ниже из ресурсов в Интернете и изо всех сил старался понять код. Я поставил комментарии ниже, заявляя, что я думаю, что это делает. Те, у кого вопросительные знаки, я не понимаю.Swift FMDB Code Пояснение
class ViewController: UIViewController {
@IBOutlet weak var name: UITextField!
@IBOutlet weak var specialty: UITextField!
//Defines name and specialty as contents of text fields
var dbpath = String()
//defines the database path
func getPath(fileName: String) -> String {
let documentsURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
//finds document and returns an array of paths
let fileURL = documentsURL.URLByAppendingPathComponent(fileName)
print(fileName)
//finds path to fileName with URLByAppendingPathComponent
print("File Path Is : \(fileURL)")
return fileURL.path!
//returns the fileURL in path format?????
}
//Button "Add Shop" definition
override func viewDidLoad() {
super.viewDidLoad()
let dirPaths =
NSSearchPathForDirectoriesInDomains(.DocumentDirectory,
.UserDomainMask, true)
//creates search paths for directories, then ?????
let docsDir = dirPaths[0]
let dbPath: String = getPath("shopdata.db")
//assigns string "shopdata.db" to dbPath
let fileManager = NSFileManager.defaultManager()
//easier access for NSFileManager, returns shared file for the process when called
if !fileManager.fileExistsAtPath(dbPath as String) {
//if there is already a database, do the following
let contactDB = FMDatabase(path: dbPath as String)
//contact database with path identified in function getPath
if contactDB == nil {
print("Error: \(contactDB.lastErrorMessage())")
//If there is no database
}
if contactDB.open() {
let sql_stmt = "CREATE TABLE IF NOT EXISTS CONTACTS (ID INTEGER PRIMARY KEY AUTOINCREMENT, SPECIALTY TEXT, NAME TEXT)"
if !contactDB.executeStatements(sql_stmt)
//executes a create table statement as defined above
{
print("Error: \(contactDB.lastErrorMessage())")
//if cannot execute statement, display error from fmdb
}
contactDB.close()
//close connection
} else {
print("Error: \(contactDB.lastErrorMessage())")
//if contact cannot be made, display error from fmdb
}
}
}
@IBAction func addShop(sender: AnyObject) {
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}