flutter-create-命令行 参考 flutter 命令行工具 正文 Flutter Create 命令行 输入flutter create -h 可以查看所有的参数、选项。 $ flutter create -h Create a new Flutter project. If run on a project that already exists, this will repair the project, recreating any files that are missing. Global op...
path, 'example.db'); _database = await openDatabase(path, version: 1, onCreate: (Database db, int version) async { await db.execute( 'CREATE TABLE IF NOT EXISTS items(id INTEGER PRIMARY KEY, name TEXT)'); }); } _insertData() async { await _database.transaction((txn) async { ...
具体来说,我们使用了CREATE TABLE IF NOT EXISTS语句来创建一个users表,该表有两个字段:id和name,其中id是主键,name是文本类型。然后,我们使用INSERT INTO语句向users表中插入一条记录,该记录的name字段为"Alice"``onCreate是在第一次打开数据库时调用的回调函数,用于创建数据库表和初始化数据。在Dart的sqflite库...
showToast(msg: '请输入内容'); // 内容为空,则不写入并提醒 } else { // 内容不空,则判断是否已经存在,存在先删除,重新创建后写入信息 if (await file.exists()) file.deleteSync(); file.createSync(); // createSync 是一个同步的创建过程 file.writeAsStringSync(text); // writeAsStringSync 是...
final String path = join(directory.path, 'example.db'); _database = await openDatabase(path, version: 1, onCreate: (Database db, int version) async { await db.execute( 'CREATE TABLE IF NOT EXISTS items(id INTEGER PRIMARY KEY, name TEXT)'); ...
String path = join(documentDirectory.path, 'yytimer.db'); print("initDb ${path}"); Database db = await openDatabase(path, version: 1, onOpen: (db) async { // 等待表创建完成 await db.execute( 'CREATE TABLE IF NOT EXISTS timerdata (id INTEGER PRIMARY KEY, title TEXT, sptime INTEGE...
{vardir =awaitgetApplicationDocumentsDirectory();///根据目录路径实例化 Directory 对象finalmyDir = Directory('${dir.path}/a/b/c');///判断目录是否存在varmyDirExists =awaitmyDir.exists();if(!myDirExists) {///创建目录///recursive 为 true 则会递归创建多级目录awaitmyDir.create(recursive:true)...
String path = join(documentsDirectory.path, "test.db"); var theDb = await openDatabase(path, version: 1, onCreate: _onCreate); return theDb; } 3. 创建数据库表 接下来,让我们看下如何使用SQFLite在flutter中创建一张数据库表 var db = await openDatabase(path); ...
首先,初始化Flutter应用程序并创建一个计数器应用程序。 fluttercreatecounter_firebase Firebase CLI的设置 参照官方文档,安装Firebase CLI 这里有几种安装方法,但你也可以实用npm来进行安装 npminstall-g firebase-tools 此后,按照官方文件进行 首先,登录到firebase,全局启用flutterfire_cli ...
enable true // Resets the list of ABIs that Gradle should create APKs for to none. reset() // Specifies that we do not want to also generate a universal APK that includes all ABIs. universalApk false } } } } //5、判断编译命令是否添加deferred-component-names参数,有就配置android dynamic...