Xcode SQLClient 问题

Question

我正在使用一个名为“SQLClient”的库，位于：https://github.com/martinrybak/SQLClient

访问我位于服务器上的数据库。安装库、pod 等后，我尝试制作一个 Objective-c 头文件并将示例代码示例放入文件中以测试是否没有错误，但 IDE 给我语法错误。

这是我刚刚放入应用程序的示例代码：

SQLClient* client = [SQLClient sharedInstance]; //initializer element is not a compile time constant

[client connect:@"server\instance:port" username:@"user" password:@"pass" database:@"db" completion:^(BOOL success) { //expected identifier or '('
    if (success) {
      [client execute:@"SELECT * FROM Users" completion:^(NSArray* results) {
        for (NSArray* table in results) {
          for (NSDictionary* row in table) {
            for (NSString* column in row) {
              NSLog(@"%@=%@", column, row[column]);
            }
          }
        }
        [client disconnect];
      }];
    }
}]; // expected ']'

我将 cmets 放在我的 IDE 给我的错误行旁边。

这是一个完整的列表：

1. 初始化元素不是编译时间常数
2. 预期标识符或'('
3. 预期为“]”
4. 消息发送表达式开头缺少“[”

任何建议将不胜感激

Answer 1

以下解决方案适用于 Swift 5 。您需要将#import "SQLClient.h" 添加到桥接头文件中。

podfile

use_frameworks!
platform :ios, '9.0'

install! 'cocoapods'

target 'SQLClient' do
use_frameworks!
pod 'SQLClient', '~> 1.0.0'
end

ViewController 文件看起来像，

override func viewDidLoad() {
        super.viewDidLoad()
         //Adding the observer for error and to receive the message
        NotificationCenter.default.addObserver(self, selector: #selector(error(_:)), name: NSNotification.Name.SQLClientError, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(message(_:)), name: NSNotification.Name.SQLClientMessage, object: nil)

        let client = SQLClient.sharedInstance()!
                  client.connect("ServerNameOrIP", username: "cool", password: "cool", database: "database") { success in
                  client.execute("SELECT * FROM table", completion: { (_ results: ([Any]?)) in
                   for table in results as! [[[String:AnyObject]]] {
                       for row in table {
                           for (columnName, value) in row {
                               print("\(columnName) = \(value)")
                           }
                       }
                   }
                   client.disconnect()
               })
           }
          }

    @objc func error(_ notification: Notification?) {
     let code = notification?.userInfo?[SQLClientCodeKey] as? NSNumber
     let message = notification?.userInfo?[SQLClientMessageKey] as? String
     let severity = notification?.userInfo?[SQLClientSeverityKey] as? NSNumber
     if let code = code, let severity = severity {
         print("Error #\(code): \(message ?? "") (Severity \(severity))")
     }
 }

    @objc func message(_ notification: Notification?) {
        let message = notification?.userInfo?[SQLClientMessageKey] as? String
        print("Message: \(message ?? "")")
    }

创建了一个示例项目here