import UIKit  class sqliteManager: NSObject {   private static let manager: sqliteManager = sqliteManager()   //單例   class func shareManager() -> sqliteManager{     return manager   }   //數(shù)據(jù)庫對象   private var db:OpaquePointer? = nil   func openDB(sqliteName:String){     //0.拿到數(shù)據(jù)庫的路徑     let path = sqliteName.docDir()     print(path)     let cPath = path.cString(using: String.Encoding.utf8)     //1.需要代開的數(shù)據(jù)庫的路徑 c語言的字符串     //2.打開之后的數(shù)據(jù)庫對象（指針）,以后所有的數(shù)據(jù)庫操作，都必須拿到這個指針才能進行相關(guān)操作     if sqlite3_open(cPath, &db) != SQLITE_OK{       print("數(shù)據(jù)庫打開失敗")       return      }     if creatTable(){       print("創(chuàng)建表成功")     }else{       print("創(chuàng)建表失敗")     }   }   private func creatTable() -> Bool   {     // 1.編寫SQL語句     // 建議: 在開發(fā)中編寫SQL語句, 如果語句過長, 不要寫在一行     // 開發(fā)技巧: 在做數(shù)據(jù)庫開發(fā)時, 如果遇到錯誤, 可以先將SQL打印出來, 拷貝到PC工具中驗證之后再進行調(diào)試     let sql = "CREATE TABLE IF NOT EXISTS T_Person( /n" +       "id INTEGER PRIMARY KEY AUTOINCREMENT, /n" +       "name TEXT, /n" +       "age INTEGER /n" +     "); /n"     //    print(sql)     // 2.執(zhí)行SQL語句     return execSQL(sql: sql)   }   func execSQL(sql: String) -> Bool   {     // 0.將Swift字符串轉(zhuǎn)換為C語言字符串     let cSQL = sql.cString(using: String.Encoding.utf8)!          // 在SQLite3中, 除了查詢意外(創(chuàng)建/刪除/新增/更新)都使用同一個函數(shù)     /*      1. 已經(jīng)打開的數(shù)據(jù)庫對象      2. 需要執(zhí)行的SQL語句, C語言字符串      3. 執(zhí)行SQL語句之后的回調(diào), 一般傳nil      4. 是第三個參數(shù)的第一個參數(shù), 一般傳nil      5. 錯誤信息, 一般傳nil      */     if sqlite3_exec(db, cSQL, nil, nil, nil) != SQLITE_OK     {       return false     }     return true   }   } 

mport UIKit  @UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate {    var window: UIWindow?     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {     // Override point for customization after application launch.     sqliteManager.shareManager().openDB(sqliteName: "tergun.sqlite")     return true   } } 

// // String+Category.swift // DSWeibo // // Created by xiaomage on 15/9/10. // Copyright © 2015年 小碼哥. All rights reserved. //  import UIKit  extension String{   /**   將當前字符串拼接到cache目錄后面   */   func cacheDir() -> String{     let path = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.cachesDirectory, FileManager.SearchPathDomainMask.userDomainMask, true).last! as NSString     return path.appendingPathComponent((self as NSString).lastPathComponent)   }   /**   將當前字符串拼接到doc目錄后面   */   func docDir() -> String   {     let path = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true).last! as NSString     return path.appendingPathComponent((self as NSString).lastPathComponent)   }   /**   將當前字符串拼接到tmp目錄后面   */   func tmpDir() -> String   {     let path = NSTemporaryDirectory() as NSString     return path.appendingPathComponent((self as NSString).lastPathComponent)   } }