iOS数据库的使用

注释：本地数据库

func prepareCoreData() {

//1.获取momd文件的路径,类型必须是momd

let path = NSBundle.mainBundle().pathForResource("Person", ofType: "momd")

//2.获取被管理的对象模型

let model = NSManagedObjectModel(contentsOfURL: NSURL(fileURLWithPath: path!))

//3.创建存储器，主要是为了将CoreData数据库和模型关联起来

let coordinator = NSPersistentStoreCoordinator(managedObjectModel: model!)

//4.设置关联数据库的路径,NSHomeDirectory获取到的是沙盒目录的相对路径

let str = NSHomeDirectory() as NSString

let coreDataPath = str.stringByAppendingPathComponent("/ 0/Person.sqlite")

//5.关联数据库路径

do {

try coordinator.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: NSURL(fileURLWithPath: coreDataPath), options: nil)

} catch let error {

print("关联错误：\(error)")

}

//6.创建上下文

context = NSManagedObjectContext(concurrencyType: NSManagedObjectContextConcurrencyType.MainQueueConcurrencyType)

//7.将存储器设置给上下文

context?.persistentStoreCoordinator = coordinator

/***********数据库环境搭建完毕************/

//读取数据库中已有的数据

//设置查询请求

let request = NSFetchRequest(entityName: "Student")

//开始查询。默认查询全部数据

do {

dataArray = try context?.executeFetchRequest(request) as! [Student]

self.tableView.reloadData()

} catch let error {

print("查询失败:\(error)")

}

}