I have an external database (localhost) that contains a "questions" table characterized by their level (Easy, Medium, Hard) and class(1st class, 2nd class, 3rd class).
I have an internal database that contains a "student" table with level and class attributes that contain in the external database.
I want to post only the questions that correspond to the level and class of the student that is already added in the internal database "SQFLite".
I posted all the questions in the JSON form but did not match the level and class of the student,
But I want when I add a new student with their level and class in the internal database, the questions that are displayed must be matched to that of the student.
class Student {
int _id;
String _name;
String _level;
String _classes ;
String _date;
Student(this._name, this._level, this._classes, this._date);
Student.withId(this._id, this._name, this._level, this._classes ,this._date);
String get date => _date;
String get level => _level;
String get classes => _classes;
String get name => _name;
int get id => _id;
set date(String value) {
_date = value;
}
set level(String value) {
_level = value;
}
set classes(String value) {
_classes = value;
}
set name(String value) {
if (value.length <= 255) {
_name = value;
}
}
Map<String, dynamic> toMap() {
var map = Map<String, dynamic>();
map["id"] = this._id;
map["name"] = this._name;
map["level"] = this._level;
map["classes"] = this._classes;
map["date"] = this._date;
return map;
}
Student.getMap(Map<String, dynamic> map){
this._id = map["id"];
this._name = map["name"];
this._level = map["level"];
this._classes= map["classes"];
this._date = map["date"];
}
}
import 'package:flutter/material.dart';
import 'package:sqflite/sqflite.dart';
import 'dart:async';
import 'dart:io';
import 'model.dart';
import 'package:path_provider/path_provider.dart';
class SQL_Helper {
static SQL_Helper dbHelper;
static Database _database;
SQL_Helper._createInstance();
factory SQL_Helper() {
if (dbHelper == null) {
dbHelper = SQL_Helper._createInstance();
}
return dbHelper;
}
String tableName = "students_table";
String _id = "id";
String __name = "name";
String __level= "level";
String __classes = "classes";
String __date = "date";
Future<Database> get database async {
if (_database == null){
_database = await initializedDatabase();
}
return _database;
}
Future<Database> initializedDatabase() async {
Directory directory = await getApplicationDocumentsDirectory();
String path = directory.path + "students.db";
var studentDB = await openDatabase(path, version: 1, onCreate: createDatabase);
return studentDB;
}
void createDatabase(Database db, int version) async {
await db.execute(
"CREATE TABLE $tableName($_id INTEGER PRIMARY KEY AUTOINCREMENT, $__name TEXT, $__level TEXT,$__classes TEXT, $__date TEXT )");
}
Future<List<Map<String, dynamic>>> getStudentMapList() async {
Database db = await this.database;
var result = await db.query(tableName, orderBy: "$_id ASC");
return result;
}
Future<int> insertStudent(Student student) async {
Database db = await this.database;
var result = await db.insert(tableName, student.toMap());
return result;
}
Future<int> updateStudent(Student student) async{
Database db = await this.database;
var result = await db.update(tableName, student.toMap(), where: "$_id = ?", whereArgs: [student.id]);
return result;
}
Future<int> deleteStudent(int id) async {
var db = await this.database;
int result = await db.rawDelete("DELETE FROM $tableName WHERE $_id = $id");
return result;
}
Future<int> getCount() async {
Database db = await this.database;
List<Map<String, dynamic>> all = await db.rawQuery("SELECT COUNT (*) FROM $tableName");
int result = Sqflite.firstIntValue(all);
return result;
}
Future<List<Student>> getStudentList() async{
var studentMapList = await getStudentMapList();
int count = studentMapList.length;
List<Student> students = new List<Student>();
for (int i = 0; i <= count -1; i++){
students.add(Student.getMap(studentMapList[i]));
}
return students;
}
}
import 'package:flutter/material.dart';
import 'package:relationtables/sql_helper.dart';
import 'package:sqflite/sqflite.dart';
import 'package:http/http.dart' as http;
import 'package:intl/intl.dart';
import 'dart:convert';
import 'model.dart';
import 'dart:async';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
// TODO: implement build
return MaterialApp(
title: "Students List",
debugShowCheckedModeBanner: false,
theme: ThemeData(
primarySwatch: Colors.cyan
),
home: StudentsList(),
);
}
}
class StudentsList extends StatefulWidget{
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return StudentsState();
}
}
class StudentsState extends State<StudentsList> {
SQL_Helper helper = new SQL_Helper();
List<Student> studentsList;
int count = 0;
@override
Widget build(BuildContext context) {
if (studentsList == null) {
studentsList = new List<Student>();
updateListView();
}
// TODO: implement build
return Scaffold(
appBar: AppBar(
title: Text("Students"),
),
body: getStudentsList(),
floatingActionButton: FloatingActionButton(
onPressed: () {
navigateToStudent(Student('','','', ''), "Add New Student");
},
tooltip: 'Add Student',
child: Icon(Icons.add),
)
);
}
ListView getStudentsList() {
return ListView.builder(
itemCount: count,
itemBuilder: (BuildContext context, int position) {
return Card(
color: Colors.white,
elevation: 2.0,
child: ListTile(
leading: Icon(Icons.person_pin),
title: Text(this.studentsList[position].name),
subtitle: Text(this.studentsList[position].level+ " | " + this.studentsList[position].classes+' '+this.studentsList[position].date),
trailing:
GestureDetector(
child: Icon(Icons.delete, color: Colors.grey,),
onTap: () {
_delete(context, this.studentsList[position]);
},
)
,
onTap: () {
Navigator.push(
context, MaterialPageRoute(builder: (context) {
return Menu();
}));
},
),
);
});
}
void _delete(BuildContext context, Student student) async {
int ressult = await helper.deleteStudent(student.id);
if (ressult != 0) {
_showSenckBar(context, "Student has been deleted");
updateListView();
}
}
void _showSenckBar(BuildContext context, String msg) {
final snackBar = SnackBar(content: Text(msg),);
Scaffold.of(context).showSnackBar(snackBar);
}
void updateListView() {
final Future<Database> db = helper.initializedDatabase();
db.then((database) {
Future<List<Student>> students = helper.getStudentList();
students.then((theList) {
setState(() {
this.studentsList = theList;
this.count = theList.length;
});
});
});
}
void navigateToStudent(Student student, String appTitle) async {
bool result = await Navigator.push(
context, MaterialPageRoute(builder: (context) {
return StudentDetail(student, appTitle);
}));
if (result) {
updateListView();
}
}
}
class StudentDetail extends StatefulWidget{
String screenTitle;
Student student;
StudentDetail(this.student , this.screenTitle);
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return Students(this.student, screenTitle);
}
}
class Students extends State<StudentDetail> {
static var _level = ["Easy", "Medium","Hard"];
static var _classes =["1st class", "2nd class","3rd class"];
String screenTitle;
Student student;
SQL_Helper helper = new SQL_Helper();
Students(this.student ,this.screenTitle);
TextEditingController studentName = new TextEditingController();
@override
Widget build(BuildContext context) {
TextStyle textStyle = Theme
.of(context)
.textTheme
.title;
studentName.text = student.name;
// TODO: implement build
return
WillPopScope(
onWillPop: () {
debugPrint("WillPopScope Button");
goBack();
},
child: Scaffold(
appBar: AppBar(
title: Text(screenTitle),
leading: IconButton(
icon: Icon(Icons.arrow_back),
onPressed: () {
goBack();
},
),
),
body: Padding(
padding: EdgeInsets.only(top: 15.0, left: 10.0, right: 10.0),
child: ListView(
children: <Widget>[
Padding(
padding: EdgeInsets.only(top: 15.0, bottom: 15.0),
child: TextField(
controller: studentName,
style: textStyle,
onChanged: (value) {
student.name = value;
},
decoration: InputDecoration(
labelText: "Name :",
labelStyle: textStyle,
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(5.0),
)
),
),
),
Row(
children: <Widget>[
SizedBox(width: 3),
Expanded(
child: DropdownButton(
isDense: true,
hint: Text('Level'),
isExpanded: true,
iconSize: 20,
items: _level.map((String dropDownStringItem) {
return DropdownMenuItem(
value: dropDownStringItem,
child: Text(dropDownStringItem),
);
}).toList(),
value: student.level == '' ? null : student.level,
onChanged: (String value) {
updateLevel(value);
},
),
),
SizedBox(width: 3),
Expanded(
child: DropdownButton(
isDense: true,
hint: Text('Class'),
isExpanded: true,
iconSize: 20,
items: _classes.map((String dropDownStringItem) {
return DropdownMenuItem(
value: dropDownStringItem,
child: Text(dropDownStringItem),
);
}).toList(),
value: student.classes == '' ? null : student.classes,
onChanged: (String value) {
updateClass(value);
},
),
),
],
),
Padding(
padding: EdgeInsets.only(top: 15.0, bottom: 15.0),
child: Row(
children: <Widget>[
Expanded(
child: RaisedButton(
color: Theme
.of(context)
.primaryColorDark,
textColor: Theme
.of(context)
.primaryColorLight,
child: Text(
'SAVE', textScaleFactor: 1.5,
),
onPressed: () {
setState(() {
debugPrint("User Click SAVED");
_save();
});
},
),
),
Container(width: 5.0,),
Expanded(
child: RaisedButton(
color: Theme
.of(context)
.primaryColorDark,
textColor: Theme
.of(context)
.primaryColorLight,
child:
Text(
'Delete', textScaleFactor: 1.5,
),
onPressed: () {
setState(() {
debugPrint("User Click Delete");
_delete();
});
},
),
),
],
),
)
],
),
),
)
);
}
void goBack() {
Navigator.pop(context, true);
}
void updateLevel(String value) {
setState(() {
student.level = value;
});
}
void updateClass(String value) {
setState(() {
student.classes = value;
});
}
void _save() async {
goBack();
student.date = DateFormat.yMMMd().format(DateTime.now());
int result;
if (student.id == null) {
result = await helper.insertStudent(student);
} else {
result = await helper.updateStudent(student);
}
if (result == 0) {
showAlertDialog('Sorry', "Student not saved");
} else {
showAlertDialog('Congratulations', 'Student has been saved successfully');
}
}
void showAlertDialog(String title, String msg){
AlertDialog alertDialog = AlertDialog(
title: Text(title),
content: Text(msg),
);
showDialog(context: context, builder: (_) => alertDialog);
}
void _delete() async {
goBack();
if (student.id == null){
showAlertDialog('Ok Delete', "No student was deleted");
return;
}
int result = await helper.deleteStudent(student.id);
if (result == 0) {
showAlertDialog('Ok Delete', "No student was deleted");
} else {
showAlertDialog('Ok Delete', "Student has been deleted");
}
}
}
class Menu extends StatefulWidget {
@override
_MenuState createState() => _MenuState();
}
class _MenuState extends State<Menu> {
@override
Widget build(BuildContext context) {
return Container(
color: Colors.tealAccent,
padding: EdgeInsets.only(top:150),
child: Center(
child: GridView.count(
crossAxisCount: 1,
padding: EdgeInsets.all(50),
children: <Widget>[
Card(
margin: EdgeInsets.all(70.0),
child: InkWell(
onTap: (){
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => Questions()
),
);
},
splashColor: Colors.deepPurple,
child: Center(
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Icon(Icons.library_books, size:70.0, color:Colors.blue,),
Text("Questions List",style: new TextStyle(fontSize: 20.0,color: Colors.black , fontWeight: FontWeight.bold))
],
),
),
)
),
]
),
)
);
}
}
class Questions extends StatefulWidget {
@override
_QuestionsState createState() => _QuestionsState();
}
class _QuestionsState extends State<Questions> {
getMethod()async{
String theUrl = 'http://10.0.2.2/Try/Try.php';
var res = await http.get(Uri.encodeFull(theUrl),headers:{"Accept":"application/json"});
var responsBody = json.decode(res.body);
print(responsBody);
return responsBody;
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: new AppBar(
title:Text("Questions", style: TextStyle(fontWeight: FontWeight.bold),) ,
backgroundColor: Colors.blue[700],
),
backgroundColor: Colors.blue[99],
body:FutureBuilder(
future: getMethod(),
builder: (BuildContext context , AsyncSnapshot snapshot){
List snap = snapshot.data;
if(snapshot.connectionState == ConnectionState.waiting){
return Center(
child: CircularProgressIndicator(),
);
}
if(snapshot.hasError){
return Center(
child: Text("Error .... "),
);
}
return ListView.separated(
separatorBuilder: (context, index) => Divider(
color: Colors.indigo,
),
itemCount: snap.length,
itemBuilder: (context,index){
return ListTile(
title: Text(
"${snap[index]['description']}", style: TextStyle(fontSize: 18.0)),
leading:Icon(Icons.question_answer, color:Colors.green , size: 20, ) ,
);
},
);
},
),
);
}
}
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