import 'package:sqlcool/sqlcool.dart';

Db db = Db();
// define the database schema
DbTable category = DbTable("category")..varchar("name", unique: true);
DbTable product = DbTable("product")
   ..varchar("name", unique: true)
   ..integer("price")
   ..text("descripton", nullable: true)
   ..foreignKey("category", onDelete: OnDelete.cascade)
   ..index("name");
List<DbTable> schema = [category, product];

String dbpath = "db.sqlite"; // relative to the documents directory
try {
  await db.init(path: dbpath, schema: schema);
} catch(e) {
  rethrow;
}

final Map<String, String> row = {name: "My item"};
try {
  int id = await db.insert(table: "category", row: row)
} catch(e) {
  rethrow;
}

try {
  List<Map<String, dynamic>> rows = await db.select(
    table: "product",
    limit: 20,
    columns: "id,name",
    where: "name LIKE '%something%'",
    orderBy: "name ASC",
  );
} catch (e) {
  rethrow;
}

try {
  int numRowsUpdated = await db.update(table: "category", 
   row: row, where: "id=1");
} catch(e) {
  rethrow;
}

try {
  await db.delete(table: "category", where: "id=3");
} catch(e) {
  rethrow;
}

try {
  final data = await db.join(
   table: "product",
   columns: "product.name,price,category.name as category_name",
   joinTable: "category",
   joinOn: "product.category=category.id");
} catch(e) {
  rethrow;
}

try {
  final data = db.mJoin(table: "product", joinsTables: <String>[
   "category",
   "manufacturer"
 ], joinsOn: <String>[
   "product.category=category.id",
   "product.manufacturer=manufacturer.id"
 ]);
} catch(e) {
  rethrow;
}

import 'dart:async';
import 'package:sqlcool/sqlcool.dart';

StreamSubscription changefeed;

changefeed = db.changefeed.listen((change) {
   print("Change in the database:");
   print("Query: ${change.query}");
   if (change.type == DatabaseChange.update) {
     print("${change.value} items updated");
   }
 });
// Dispose the changefeed when finished using it
changefeed.cancel();

import 'package:flutter/material.dart';
import 'package:sqlcool/sqlcool.dart';

class _PageSelectBlocState extends State<PageSelectBloc> {
  SelectBloc bloc;

  @override
  void initState() {
    super.initState();
    this.bloc = SelectBloc(
        table: "items", orderBy: "name", reactive: true);
  }

  @override
  void dispose() {
    bloc.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("My app")),
      body: StreamBuilder<List<Map>>(
          stream: bloc.items,
          builder: (BuildContext context, AsyncSnapshot snapshot) {
            if (snapshot.hasData) {
              // the select query has not found anything
              if (snapshot.data.length == 0) {
                return Center(child: const Text("No data"));
              }
              // the select query has results
              return ListView.builder(
                  itemCount: snapshot.data.length,
                  itemBuilder: (BuildContext context, int index) {
                    var item = snapshot.data[index];
                    return ListTile(
                      title: GestureDetector(
                        child: Text(item["name"]),
                        onTap: () => someFunction()),
                    );
                  });
            } else {
              // the select query is still running
              return CircularProgressIndicator();
            }
          }),
    );
  }
}

class PageSelectBloc extends StatefulWidget {
  @override
  _PageSelectBlocState createState() => _PageSelectBlocState();
}

final carTable = DbTable("car")
  ..varchar("name")
  ..integer("max_speed")
  ..real("price")
  ..integer("year")
  ..boolean("is_4wd", defaultValue: false)
  ..foreignKey("manufacturer", onDelete: OnDelete.cascade);

final manufacturerTable = DbTable("manufacturer")..varchar("name");

import 'package:sqlcool/sqlcool.dart';
// the database schema
import 'schema.dart';
// another model
import 'manufacturer_model.dart';

class Car with DbModel {
  Car(
      {this.id,
      this.name,
      this.maxSpeed,
      this.price,
      this.year,
      this.is4wd,
      this.manufacturer});

  /// define some class properties

  final String name;
  final int maxSpeed;
  final double price;
  final DateTime year;
  final bool is4wd;
  // this is a foreign key to another model
  Manufacturer manufacturer;

  /// [DbModel] required overrides

  @override
  int id;

  /// the [Db] used
  /// pass it your main db
  @override
  Db get db => db;

  /// the table schema representation
  /// check example/pages/dbmodels/schema.dart
  @override
  DbTable get table => carTable;

  /// serialize a row to the database
  @override
  Map<String, dynamic> toDb() {
    // we want the foreign key to be recorded
    assert(manufacturer?.id != null);
    final row = <String, dynamic>{
      "name": name,
      "max_speed": maxSpeed,
      "price": price,
      "year": year.millisecondsSinceEpoch,
      "is_4wd": is4wd,
      "manufacturer": manufacturer.id
    };
    return row;
  }

  /// deserialize a row from database
  @override
  Car fromDb(Map<String, dynamic> map) {
    final car = Car(
      id: map["id"] as int,
      name: map["name"].toString(),
      maxSpeed: map["max_speed"] as int,
      price: map["price"] as double,
      year: DateTime.fromMillisecondsSinceEpoch(map["year"] as int),
      is4wd: (map["is_4wd"].toString() == "true"),
    );
    // the key will be present only with join queries
    // in a simple select this data is not present
    if (map.containsKey("manufacturer")) {
      car.manufacturer =
          Manufacturer().fromDb(map["manufacturer"] as Map<String, dynamic>);
    }
    return car;
  }

  /// Create a static join method for convenience

  static Future<List<Car>> selectRelated({String where, int limit}) async {
    final cars = List<Car>.from(
        await Car().sqlJoin(where: where, limit: limit, verbose: true));
    return cars;
  }
}

/// car is an instance of [Car]
await car.sqlInsert();
await car.sqlUpdate();
await car.sqlUpsert();
await car.sqlDelete();
final cars = Car.selectRelated(where: "speed>200");
// foreign keys are retrieved as model instances
print(cars[0].manufacturer.name);