CoreData实践（三）——插入数据并使用SQLite Professional查看

在学会了如何在Xcode中设计数据库的结构之后，我们就要代码实现插入一条数据。

（1）代码实现如下：

import UIKit
import CoreData

class ViewController: UIViewController {

  override func viewDidLoad() {
    super.viewDidLoad()

    
    var context = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
    
    
    
    var row:AnyObject = NSEntityDescription.insertNewObjectForEntityForName("Users",inManagedObjectContext: context!)
    row.setValue("Robert",forKey: "name")
    row.setValue(23,forKey: "age")
    context?.save(nil)
    
    
    println("Run Here")
    
  }

  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
  }


}

（3）在电脑上安装SQLite Professional，用于查看SQLite数据库。我已经放到云盘上，大家可以下载http://pan.baidu.com/s/1ntEeJup 。然后安装就可以 了。

（4）在AppDelegate.swift的自动生成的一个方法中，使用println()方法打印url,可以找到程序生成的数据库文件的位置：

lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator? = {
      // The persistent store coordinator for the application. This implementation creates and return a coordinator,having added the store for the application to it. This property is optional since there are legitimate error conditions that could cause the creation of the store to fail.
      // Create the coordinator and store
      var coordinator: NSPersistentStoreCoordinator? = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
      let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("UsingData.sqlite")
    
    
    println(url)
    
    
      var error: NSError? = nil
      var failureReason = "There was an error creating or loading the application's saved data."
      if coordinator!.addPersistentStoreWithType(NSSQLiteStoreType,configuration: nil,URL: url,options: nil,error: &error) == nil {
          coordinator = nil
          // Report any error we got.
          var dict = [String: AnyObject]()
          dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data"
          dict[NSLocalizedFailureReasonErrorKey] = failureReason
          dict[NSUnderlyingErrorKey] = error
          error = NSError(domain: "YOUR_ERROR_DOMAIN",code: 9999,userInfo: dict)
          // Replace this with code to handle the error appropriately.
          // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application,although it may be useful during development.
          NSLog("Unresolved error (error),(error!.userInfo)")
          abort()
      }
      
      return coordinator
  }()

github主页：https://github.com/chenyufeng1991 。欢迎大家访问！

（编辑：李大同）

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