Question

我是swift的新手，只是遵循了sqlite的教程，它运行得很好，但升级到swift 2.1之后，它将“可选”添加到我的结果中，我该如何摆脱它？

查找数据功能

    @IBAction func findContact(sender: UIButton)
    {
        if database.open() {
        let querySQL = "SELECT address, phone FROM CONTACTS WHERE name = '\(name.text)'"

            let results:FMResultSet? = database.executeQuery(querySQL,withArgumentsInArray: nil)
            if results!.next() == true {
                if let address1=results!.stringForColumn("address")
                {
                address.text = address1
                }

                phone.text = results!.stringForColumn("phone")
                status.text = "Record Found"
            } else {
                status.text = "Record not found"
                address.text = ""
                phone.text = ""
            }
            database.close()
        } else {
            print("Error: \(database.lastErrorMessage())", terminator: "")
        }
        }

保存数据功能

@IBAction func saveData(sender: UIButton)
        {
            let database = FMDatabase(path: databasePath as String)

            if database.open() {

                let insertSQL = "INSERT INTO CONTACTS (name, address, phone) VALUES ('\(name.text)', '\(address.text)', '\(phone.text)')"

                let result = database.executeUpdate(insertSQL,
                    withArgumentsInArray: nil)

                if !result {
                    status.text = "Failed to add contact"
                    print("Error: \(database.lastErrorMessage())", terminator: "")
                } else {
                    status.text = "Contact Added"
                    name.text = ""
                    address.text = ""
                    phone.text = ""
                }
            } else {
                print("Error: \(database.lastErrorMessage())", terminator: "")
            }

        }

screen shot

Answer 1

问题不在于您选择数据时。问题在于您插入数据时。在插入时您只需在表格中插入可选值，如地址字段和电话号码，如屏幕截图所示......所以，在插入时，您需要打开该可选值以避免optional()关键字。

Answer 2

let querySQL = "SELECT address, phone FROM CONTACTS WHERE name = '\(name.text)'"

你需要添加name.text ..

的感叹号结尾

ecs: (name.text!)

可能会帮助你。

升级到swift 2.1后，Swift返回可选（“值”）

2 个答案: