forked from lxm_flutter/FlutterUnit
57 lines
1.8 KiB
Dart
57 lines
1.8 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:sqflite/sqflite.dart';
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import 'package:path/path.dart';
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class FlutterDb {
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FlutterDb._(); //私有化构造
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static final FlutterDb db = FlutterDb._(); //提供实例
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static const db_name = "flutter.db"; //数据库名
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Database _database; //数据库
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Future<Database> get database async {
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//获取数据库对象
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_database = _database ?? await initDB();
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return _database;
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}
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static const String sql_create_widget = """
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CREATE TABLE IF NOT EXISTS widget(
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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name VARCHAR(64) NOT NULL UNIQUE,
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nameCN VARCHAR(12) NOT NULL,
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childCount INTEGER NOT NULL DEFAULT 0,
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family INTEGER NOT NULL,
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lever FLOAT(2) NOT NULL,
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image VARCHAR(128) NOT NULL,
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linkWidget TEXT DEFAULT '',
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info VARCHAR(256) NOT NULL
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);"""; //建表语句
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static const String sql_create_node = """
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CREATE TABLE IF NOT EXISTS node(
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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widgetId INTEGER NOT NULL,
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name VARCHAR(64) NOT NULL,
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priority INTEGER DEFAULT 0,
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subtitle TEXT NOT NULL,
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code TEXT NOT NULL
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);"""; //建表语句
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Future<Database> initDB() async {
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//初始化数据库
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WidgetsFlutterBinding.ensureInitialized(); //初始化绑定
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String path = join(await getDatabasesPath(), db_name); //获取数据库路径
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return await openDatabase(
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//打开数据库
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path, //路径
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version: 1, //版本
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onOpen: (db) => print("数据库-------onOpen"),
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onUpgrade: (db, old, now) => print("数据库-------onUpgrade"),
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onCreate: (Database db, int version) async {
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print("数据库-------onCreate");
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await db.execute(sql_create_widget);
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await db.execute(sql_create_node);
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},
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);
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}
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} |