sqflite

标签：int   size   gac   lap   ges   port   test   nal   response   

import ‘package:flutter/material.dart‘;
import ‘package:http/http.dart‘ as http;
import ‘dart:convert‘;
import ‘package:demo0506/SqliteHelper.dart‘;

void main()=>runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  final String url=‘http://jsonplaceholder.typicode.com/posts‘;
  final sqlHelp=SqliteHelper();
  getAllPost()async{
    await sqlHelp.open();
    return await sqlHelp.queryAll();
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      floatingActionButton: FloatingActionButton(
          child: Icon(Icons.http),
          onPressed: ()async{
            await sqlHelp.open();
            var response = await http.get(url);
            List listData = jsonDecode(response.body);
            listData.forEach((e) async => await sqlHelp.insert(e));
            setState(() {

            });
      }),
      appBar: AppBar(title: Text(‘DataBase‘),),
      body: FutureBuilder(
          future: getAllPost(),
          builder: (BuildContext context,snapshot){
            if(snapshot.hasData){
              List _listData=snapshot.data;
              return ListView.builder(
                itemCount: _listData.length,
                itemBuilder: (context,index){
                    return InkWell(
                        onTap:()async{
                          await sqlHelp.delete(_listData[index][‘id‘]);
                          setState(() {

                          });
                        },
                        child: ListTile(title: Text(_listData[index][‘title‘]),));
                  },);
            }
            return Container();
          }
      ),
    );
  }
}

import ‘package:sqflite/sqflite.dart‘;
import ‘package:flutter/material.dart‘;
import ‘package:http/http.dart‘ as http ;

class SqliteHelper{
  final sqlFileName=‘mydb.sql‘;
  final table=‘post‘;
  Database db;
  open()async{
    String path = ‘${await getDatabasesPath()}/$sqlFileName‘;
    if(db==null){
      db=await openDatabase(path,version: 1,onCreate: (db,ver)async{
        await db.execute(‘‘‘
        Create Table post(
        id integer primary key,
        userId integer,
        title text,
        body text        
        );
        ‘‘‘);
      });
    }
  }
  insert(Map<String, dynamic> map)async{
    await db.insert(table, map);
  }
  queryAll()async{
    return await db.query(table,columns: null);
  }
  delete(int id)async{
    return await db.delete(table,where: ‘id=$id‘);
  }
}

sqflite

标签：int   size   gac   lap   ges   port   test   nal   response   

原文地址：https://www.cnblogs.com/braveheart007/p/10822750.html