SQLite3是嵌入到ios中的關系型數據庫。對存儲大規模的數據非常實用，使得不必將每個對象加到內存中。

支持NULL、INTEGER、REAL（浮點數字）、TEXT（字符串和文本）、BLOB（二進制對象）數據類型。

1、通過Firefox中的SQLite Manager組件創建一個數據庫文件，并在其中創建創建一個Table，添加相關的參數。

2、將創建好的文件推到Xcode項目中，并在Link Binary With Libraries中添加libsqlite3.dylib依賴庫。

3、新建一個C語言類型文件，對話框會自動添加橋接文件，在文件中添加語句#import<sqlite3.h>。

4、然后創建一個DataBaseOperations.swift文件來管理數據庫。

在DataBaseOperation.swift文件中，申明一個數據庫指針。

//不透明指針，對應C語言里面的void *，這里指sqlite3指針private var db:COpaquePointer = nil

創建一個初始化方法，在初始化方法中執行打開數據庫操作。

//初始化方法打開數據庫 required init(dbPath:String){print("db path:" + dbPath)//String類的路徑，轉換成cStringlet cpath = dbPath.cStringUsingEncoding(NSUTF8StringEncoding)//打開數據庫let error = sqlite3_open(cpath!, &db)//數據庫打開失敗處理if error != SQLITE_OK {sqlite3_close(db)}} deinit{self.colseDb()}//關閉數據庫 func colseDb(){sqlite3_close(db)} //代碼創建表func createTable() -> Bool{//sql語句let sql = "CREATE TABLE UserTable(id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, username TEXT NOT NULL, password TEXT NOT NULL, email TEXT, age INTEGER)"//執行sql語句let execResult = sqlite3_exec(db, sql.cStringUsingEncoding(NSUTF8StringEncoding)!, nil, nil, nil);//判斷是否執行成功if (execResult != SQLITE_OK) {return false}return true} //插入一條信息func addUser(user: Person) -> Bool{//sql語句let sql = "INSERT INTO UserTable (username, password, email, age) VALUES (?, ?, ?, ?);";//sql語句轉換成cString類型 let cSql = sql.cStringUsingEncoding(NSUTF8StringEncoding)//sqlite3_stmt 指針var stmt:COpaquePointer = nil//1.編譯sqllet prepare_result = sqlite3_prepare_v2(self.db, cSql!, -1, &stmt, nil)//判斷如果失敗，獲取失敗信息if prepare_result != SQLITE_OK {sqlite3_finalize(stmt)if let error = String.fromCString(sqlite3_errmsg(self.db)) {let msg = "SQLiteDB - failed to prepare SQL: \(sql), Error: \(error)"print(msg)self.alert(msg)}return false}//2.bind 綁定參數//第2個參數：索引從1開始//最后一個參數為函數指針sqlite3_bind_text(stmt, 1, user.name!.cStringUsingEncoding(NSUTF8StringEncoding)!, -1, nil);sqlite3_bind_text(stmt, 2, user.password!.cStringUsingEncoding(NSUTF8StringEncoding)!, -1, nil);sqlite3_bind_text(stmt, 3, user.email!.cStringUsingEncoding(NSUTF8StringEncoding)!, -1, nil);sqlite3_bind_int(stmt, 4, CInt(user.age!));//3.step執行let step_result = sqlite3_step(stmt)//判斷執行結果，如果失敗，獲取失敗信息if step_result != SQLITE_OK && step_result != SQLITE_DONE {sqlite3_finalize(stmt)if let err = String.fromCString(sqlite3_errmsg(self.db)) {let msg = "SQLiteDB - failed to execute SQL: \(sql), Error: \(err)"print(msg)self.alert(msg)}return false}//4.finalize sqlite3_finalize(stmt);return true} //查詢func readAllUsers() -> [Person]{//聲明一個Person對象數組（查詢的信息會添加到該數組）var usersArr = [Person]()//查詢sql語句let sql = "SELECT * FROM UserTable;";//sqlite3_stmt 指針var stmt:COpaquePointer = nillet cSql = sql.cStringUsingEncoding(NSUTF8StringEncoding)//1.編譯sqllet prepare_result = sqlite3_prepare_v2(self.db, cSql!, -1, &stmt, nil)if prepare_result != SQLITE_OK {sqlite3_finalize(stmt)if let error = String.fromCString(sqlite3_errmsg(self.db)) {let msg = "SQLiteDB - failed to prepare SQL: \(sql), Error: \(error)"print(msg)self.alert(msg)}return usersArr}//2.stepwhile (sqlite3_step(stmt) == SQLITE_ROW) {let user = Person()//循環 從數據庫獲取數據，添加到數組中let cName = UnsafePointer<CChar>(sqlite3_column_text(stmt, 0))let cPwd = UnsafePointer<CChar>(sqlite3_column_text(stmt, 1))let cEmail = UnsafePointer<CChar>(sqlite3_column_text(stmt, 2))let cAge = sqlite3_column_int(stmt, 3)user.name = String.fromCString(cName)user.password = String.fromCString(cPwd)user.email = String.fromCString(cEmail)user.age = Int(cAge)usersArr += [user]}//3.finalize sqlite3_finalize(stmt);return usersArr} //更新一條信息func updateUser(name: String , toName:String) -> Bool{//更新sql語句let sql = "update UserTable set username = '\(toName)' where username = '\(name)'";//sqlite3_stmt 指針var stmt:COpaquePointer = nillet cSql = sql.cStringUsingEncoding(NSUTF8StringEncoding)//1.編譯sqllet prepare_result = sqlite3_prepare_v2(self.db, cSql!, -1, &stmt, nil)//判斷如果失敗，獲取失敗信息if prepare_result != SQLITE_OK {sqlite3_finalize(stmt)if let error = String.fromCString(sqlite3_errmsg(self.db)) {let msg = "SQLiteDB - failed to prepare SQL: \(sql), Error: \(error)"print(msg)self.alert(msg)}return false}//2.step執行let step_result = sqlite3_step(stmt)//判斷執行結果，如果失敗，獲取失敗信息if step_result != SQLITE_OK && step_result != SQLITE_DONE {sqlite3_finalize(stmt)if let err = String.fromCString(sqlite3_errmsg(self.db)) {let msg = "SQLiteDB - failed to execute SQL: \(sql), Error: \(err)"print(msg)self.alert(msg)}return false}//4.finalize sqlite3_finalize(stmt);return true} //刪除一條信息func deleteUser(username: String) -> Bool{//刪除sql語句let sql = "delete from UserTable where username = '\(username)'";//sqlite3_stmt 指針var stmt:COpaquePointer = nillet cSql = sql.cStringUsingEncoding(NSUTF8StringEncoding)//1.編譯sqllet prepare_result = sqlite3_prepare_v2(self.db, cSql!, -1, &stmt, nil)//判斷如果失敗，獲取失敗信息if prepare_result != SQLITE_OK {sqlite3_finalize(stmt)if let error = String.fromCString(sqlite3_errmsg(self.db)) {let msg = "SQLiteDB - failed to prepare SQL: \(sql), Error: \(error)"print(msg)self.alert(msg)}return false}//3.step執行let step_result = sqlite3_step(stmt)//判斷執行結果，如果失敗，獲取失敗信息if step_result != SQLITE_OK && step_result != SQLITE_DONE {sqlite3_finalize(stmt)if let err = String.fromCString(sqlite3_errmsg(self.db)) {let msg = "SQLiteDB - failed to execute SQL: \(sql), Error: \(err)"print(msg)self.alert(msg)}return false}//4.finalize sqlite3_finalize(stmt);return true} //定義一個報警器 func alert(msg:String) {dispatch_async(dispatch_get_main_queue()) {let alert = UIAlertView(title: "SQLiteDB", message:msg, delegate: nil, cancelButtonTitle: "OK")alert.show()}}

因為工程數據庫文件打包之后，會在NSBundle.mainBundle()路徑下，該路徑是只讀的，不允許修改，所以必須把該路徑下的數據庫拷貝一份到Documents路徑下，以后整個工程都將操作Documents路徑下的數據庫。

在ViewController中，添加一下代碼。

//聲明一個Documents下的路徑let dbPath = NSHomeDirectory() + "/Documents/RWDataTest.sqlite"//判斷數據庫文件是否存在if !NSFileManager.defaultManager().fileExistsAtPath(dbPath){//獲取安裝包內數據庫路徑let bundleDBPath = NSBundle.mainBundle().pathForResource("RWDataTest", ofType: "sqlite")!//將安裝包內數據庫拷貝到Documents目錄下do{try NSFileManager.defaultManager().copyItemAtPath(bundleDBPath, toPath: dbPath)}catch let error as NSError {print(error)//如果創建失敗，error 會返回錯誤信息 }} //打開數據庫let dbOperation = DatabaseOperations(dbPath: dbPath)//添加一張表 dbOperation.createTable();//插入一條信息， 通過Person對象來傳值let person:Person = Person(name: "劉明洋", pwd: "liumingyang", email: "liumingyang@leadingdo.com", age: 30)dbOperation.addUser(person)//查詢let personArray:[Person] = dbOperation.readAllUsers()print("共搜索到：\(personArray.count) 條數據" )//更新dbOperation.updateUser("劉明洋", toName: "劉蕙通")//刪除dbOperation.deleteUser("劉蕙通")//關閉數據庫dbOperation.colseDb()

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