### Flutter App Initialization

Source: https://pub.dev/packages/sqfentity/example

Standard Flutter application setup including MaterialApp and MyHomePage widgets. This is the root of the application.

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

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // TRY THIS: Try running your application with "flutter run". You'll see
        // the application has a blue toolbar. Then, without quitting the app,
        // try changing the seedColor in the colorScheme below to Colors.green
        // and then invoke "hot reload" (save your changes or press the "hot
        // reload" button in a Flutter-supported IDE, or press "r" if you used
        // the command line to start the app).
        //
        // Notice that the counter didn't reset back to zero; the application
        // state is not lost during the reload. To reset the state, use hot
        // restart instead.
        //
        // This works for code too, not just values: Most code changes can be
        // tested with just a hot reload.
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

```

--------------------------------

### List Playlists of a Track

Source: https://pub.dev/packages/sqfentity_gen/changelog

This example demonstrates how to retrieve all playlists associated with a specific track, after the models have been generated.

```dart
final track = await Track().getById(1);
  final playlists = await track.getPlaylists().toList();

```

--------------------------------

### Initialize Database and Run Samples

Source: https://pub.dev/packages/sqfentity_gen/example

This function initializes the database and runs a series of sample operations. Ensure the database is initialized correctly on application start.

```dart
await runSamples();
```

--------------------------------

### Select Products with Pagination

Source: https://pub.dev/packages/sqfentity

Implement pagination to retrieve a specific page of results. This example fetches the 3rd page with 5 items per page.

```dart
Product().select().page(3,5).toList()
```

--------------------------------

### Select All Products

Source: https://pub.dev/packages/sqfentity

Example of selecting all rows from the 'product' table without any filters, using `Product().select().toList()`. Displays the first few retrieved products.

```dart
flutter EXAMPLE 1.1: SELECT ALL ROWS WITHOUT FILTER ex: SELECT * FROM PRODUCTS
flutter  -> Product().select().toList()
flutter 20 matches found:
flutter {id: 1, name: Notebook 12", description: 128 GB SSD i7, price: 6899.0, isActive: true, categoryId: 1, rownum: 0, isDeleted: false}
flutter {id: 2, name: Notebook 12", description: 256 GB SSD i7, price: 8244.0, isActive: true, categoryId: 1, rownum: 0, isDeleted: false}
flutter {id: 3, name: Notebook 12", description: 512 GB SSD i7, price: 9214.0, isActive: true, categoryId: 1, rownum: 0, isDeleted: false}
flutter {id: 4, name: Notebook 13", description: 128 GB SSD, price: 8500.0, isActive: true, categoryId: 1, rownum: 0, isDeleted: false}
flutter {id: 5, name: Notebook 13", description: 256 GB SSD, price: 9900.0, isActive: true, categoryId: 1, rownum: 0, isDeleted: false}
flutter {id: 6, name: Notebook 13", description: 512 GB SSD, price: 11000.0, isActive: false, categoryId: 1, rownum: 0, isDeleted: false}
flutter {id: 7, name: Notebook 15", description: 128 GB SSD, price: 8999.0, isActive: false, categoryId: 1, rownum: 0, isDeleted: false}
flutter {id: 8, name: Notebook 15", description: 256 GB SSD, price: 10499.0, isActive: false, categoryId: 1, rownum: 0, isDeleted: false}
flutter {id: 9, name: Notebook 15", description: 512 GB SSD, price: 11999.0, isActive: true, categoryId: 1, rownum: 0, isDeleted: false}
flutter {id: 10, name: Ultrabook 13", description: 128 GB SSD i5, price: 9954.0, isActive: true, categoryId: 2, rownum: 0, isDeleted: false}
flutter {id: 11, name: Ultrabook 13", description: 256 GB SSD i5, price: 11154.0, isActive: true, categoryId: 2, rownum: 0, isDeleted: false}
flutter {id: 12, name: Ultrabook 13", description: 512 GB SSD i5, price: 13000.0, isActive: true, categoryId: 2, rownum: 0, isDeleted: false}
flutter {id: 13, name: Ultrabook 15", description: 128 GB SSD i7, price: 11000.0, isActive: true, categoryId: 2, rownum: 0, isDeleted: false}
flutter {id: 14, name: Ultrabook 15", description: 256 GB SSD i7, price: 12000.0, isActive: true, categoryId: 2, rownum: 0, isDeleted: false}
```

--------------------------------

### List Tracks of a Playlist

Source: https://pub.dev/packages/sqfentity_gen/changelog

After generating models, you can retrieve related records. This example shows how to list all tracks associated with a specific playlist.

```dart
final playlist = await Playlist().getById(1);
  final tracks = await playlist.getTracks().toList();

```

--------------------------------

### Get Products from Category

Source: https://pub.dev/packages/sqfentity

Fetches a list of products belonging to a specific category. Iterates through the results to display product details.

```dart
final category = await Category().getById(1);
final productList = await category.getProducts();

for(var product in productList) {
   print(product.toMap());
   }
```

--------------------------------

### Add Multiple Products to Database

Source: https://pub.dev/packages/sqfentity_gen/example

Demonstrates saving multiple product entries to the database using the Product model. Includes examples for different product types and storage capacities.

```dart
await Product(
        name: 'Notebook 13"',
        description: '128 GB SSD',
        price: 8500,
        categoryId: 1,
        date: DateTime(2020, 01, 04),
        datetime: DateTime(2020, 01, 04, 15))
        .save();
    await Product(
        name: 'Notebook 13"',
        description: '256 GB SSD',
        price: 9900,
        categoryId: 1,
        date: DateTime(2020, 01, 05),
        datetime: DateTime(2020, 01, 05, 16))
        .save();
    await Product(
        name: 'Notebook 13"',
        description: '512 GB SSD',
        price: 11000,
        categoryId: 1,
        date: DateTime(2020, 01, 06),
        datetime: DateTime(2020, 01, 06, 17))
        .save();

    await Product(
        name: 'Notebook 15"',
        description: '128 GB SSD',
        price: 8999,
        categoryId: 1,
        date: DateTime(2020, 01, 07),
        datetime: DateTime(2020, 01, 07, 18))
        .save();
    await Product(
        name: 'Notebook 15"',
        description: '256 GB SSD',
        price: 10499,
        categoryId: 1,
        date: DateTime(2020, 01, 08),
        datetime: DateTime(2020, 01, 08, 19))
        .save();
    await Product(
        name: 'Notebook 15"',
        description: '512 GB SSD',
        price: 11999,
        categoryId: 1,
        date: DateTime(2020, 01, 09),
        datetime: DateTime(2020, 01, 09, 20))
        .save();

    await Product(
        name: 'Ultrabook 13"',
        description: '128 GB SSD i5',
        price: 9954,
        categoryId: 2)
        .save();
    await Product(
        name: 'Ultrabook 13"',
        description: '256 GB SSD i5',
        price: 11154,
        categoryId: 2)
        .save();
    await Product(
        name: 'Ultrabook 13"',
        description: '512 GB SSD i5',
        price: 13000,
        categoryId: 2)
        .save();

    await Product(
        name: 'Ultrabook 15"',
        description: '128 GB SSD i7',
        price: 11000,
        categoryId: 2)
        .save();
    await Product(
        name: 'Ultrabook 15"',
        description: '256 GB SSD i7',
        price: 12000,
        categoryId: 2)
        .save();
    await Product(
        name: 'Ultrabook 15"',
        description: '512 GB SSD i7',
        price: 14000,
        categoryId: 2)
        .save();
    print('added 15 new products');

    // add a few dummy products for delete (id:from 16 to 20)
    await Product(name: 'Product 1').save();
    await Product(name: 'Product 2').save();
    await Product(name: 'Product 3').save();
    await Product(name: 'Product 4').save();
    await Product(name: 'Product 5').save();
    print('added 5 dummy products');
  }
  return true;
}
```

--------------------------------

### Syncronize data from the web

Source: https://pub.dev/packages/sqfentity

This example shows how to synchronize data from a web URL. It first fetches JSON data from a given URL using `Todo.fromWebUrl()`, then saves this data locally using `upsertAll()`, and finally retrieves and prints the first 10 records from the local database.

```APIDOC
## Syncronize data from the web #
EXAMPLE 8.2: Fill List from web with Url (JSON data) and saveAll
Step 1: Todo.fromWebUrl("URL",(todosList){}) method gets json data from the web and loads into the todosList
Step 2: Call Todo().upsertAll(todosList) method saves all data in your local database
```dart

  todosList = await Todo.fromWebUrl("https://jsonplaceholder.typicode.com/todos");
  final results = await Todo().upsertAll(todosList);

  // print upsert Results
  for (var res in results) {
    print(res.toString()); 
  }

  todosList = await Todo().select().top(10).toList();
  print(todosList.length.toString() + " matches found\n");
  for (var todo in todosList) {
    print(todo.toMap());
  }

```
```

--------------------------------

### Get Product by ID (Method 1)

Source: https://pub.dev/packages/sqfentity

Fetch a single product record by its ID using the getById() method.

```dart
   var product = await Product().getById(5);
```

--------------------------------

### Configure Log Function for Failures

Source: https://pub.dev/packages/sqfentity/changelog

Example of setting up a log function using the logFunction parameter. This function is called when an insert or update operation fails, allowing for error reporting.

```dart
   @SqfEntityBuilder(myDbModel)
   const myDbModel = SqfEntityModel(
       ...
       logFunction: getLogFunction,
   );

   getLogFunction(Log log) {
      // Report the error to the server here
   }
```

--------------------------------

### Flutter Build Method Example

Source: https://pub.dev/packages/sqfentity/example

This is a standard Flutter build method that includes comments explaining its purpose and how it reruns on state changes. It demonstrates basic Scaffold, AppBar, and Column widget usage.

```dart
  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // TRY THIS: Try changing the color here to a specific color (to
        // Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
        // change color while the other colors stay the same.
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          //
          // TRY THIS: Invoke "debug painting" (choose the "Toggle Debug Paint"
          // action in the IDE, or press "p" in the console), to see the
          // wireframe for each widget.
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}
```

--------------------------------

### Define SqfEntity Table with Form Generation

Source: https://pub.dev/packages/sqfentity_gen/changelog

Example of defining a SqfEntity table with form generation enabled. Includes configuration for table name, primary key, soft deleting, and fields with default values and date range constraints.

```dart
@SqfEntityBuilderForm(tableCategory, formListTitleField: 'name', hasSubItems: true)
const tableCategory = SqfEntityTable(
    tableName: 'category',
    primaryKeyName: 'id',
    primaryKeyType: PrimaryKeyType.integer_auto_incremental,
    useSoftDeleting: true,
    // when useSoftDeleting is true, creates a field named 'isDeleted' on the table, and set to '1' this field when item deleted (does not hard delete)
    modelName:
        null, // SqfEntity will set it to TableName automatically when the modelName (class name) is null
    // declare fields
    fields: [
    SqfEntityField('name', DbType.text),
    SqfEntityField('isActive', DbType.bool, defaultValue: true),
    SqfEntityField('date1', DbType.datetime, defaultValue: 'DateTime.now()', minValue: '2019-01-01', maxValue: '2023-01-01'),
    SqfEntityField('date2', DbType.datetime,  minValue: '2020-01-01', maxValue: '2022-01-01')
    ]);

```

--------------------------------

### Import sqfentity_gen in Dart code

Source: https://pub.dev/packages/sqfentity_gen/install

Import the package into your Dart files to start using its functionalities.

```dart
import 'package:sqfentity_gen/sqfentity_gen.dart';
```

--------------------------------

### Define One-to-One Relationship in SqfEntity

Source: https://pub.dev/packages/sqfentity_gen/changelog

Example of defining a one-to-one relationship between 'property' and 'product' tables using SqfEntity. Ensure the parent table is correctly referenced.

```dart
const tableProductProperties = SqfEntityTable(
tableName: 'property',
primaryKeyName: 'propertyId',
//useSoftDeleting: true,
//primaryKeyType: PrimaryKeyType.integer_auto_incremental,
fields: [
    SqfEntityField('weight', DbType.real),
    SqfEntityField('stockQty', DbType.numeric),
    SqfEntityFieldRelationship(
    //fieldName: 'productId',
        parentTable: tableProduct, relationType: RelationType.ONE_TO_ONE)
],
);

```

--------------------------------

### Constraint Violation Results

Source: https://pub.dev/packages/sqfentity_gen/changelog

Example output showing save failures due to NOT NULL, CHECK, and UNIQUE constraint violations.

```text
flutter: -----TEST: NOT NULL CONSTRAINT (name isNotNull)
flutter: product-> Save failed. Error: "NOT NULL constraint failed: product.name"...

flutter: -----TEST: CHECK CONSTRAINT (price must be greater than 0)
flutter: product-> Save failed. Error:  "CHECK constraint failed: product"...

flutter: -----TEST: UNIQUE CONSTRAINT (name must be UNIQUE)
flutter: product-> Save failed. Error: "UNIQUE constraint failed: product.name"...
```

--------------------------------

### Update Multiple Records by Query (Activate)

Source: https://pub.dev/packages/sqfentity

Update multiple records that match a specific query. This example shows how to activate products with IDs less than or equal to 10.

```dart
Product().select().id.lessThanOrEquals(10).update({"isActive": 1});
```

--------------------------------

### Add sqfentity Dependency to Flutter Project

Source: https://pub.dev/packages/sqfentity/install

Run this command in your terminal to add the sqfentity package to your project's dependencies. This command also implicitly runs 'flutter pub get'.

```bash
 $ flutter pub add sqfentity
```

--------------------------------

### Get Category from Product

Source: https://pub.dev/packages/sqfentity_gen/example

Retrieves a product by its ID and then fetches its associated category object. Handles cases where the product might not exist.

```dart
final product = await Product().getById(3);
  if (product != null) {
    final category = await product.getCategory();
    print(
        'EXAMPLE 7.1: goto Category Object from Product \n-> Product.getCategory(); ');

    print(
        'The category of \'${product.name}\' is: ${category == null ? 'null' : category.toMap()}');
  }
```

--------------------------------

### Get Product by ID (Method 2)

Source: https://pub.dev/packages/sqfentity

Retrieve a single product record by its ID using the fluent select() API with the id.equals() and toSingle() methods.

```dart
 var product = await Product().select().id.equals(5).toSingle();
```

--------------------------------

### Define Default Columns for All Tables

Source: https://pub.dev/packages/sqfentity/changelog

Example of defining default columns for all tables in a database model using the defaultColumns parameter. This ensures that specified columns are added to every table.

```dart
    @SqfEntityBuilder(myDbModel)
    const myDbModel = SqfEntityModel(
    modelName: 'AppDatabase',
    databaseName: 'AppDatabase.db',
    databaseTables: [
       table1, 
       table2
    ],
    sequences: [seqIdentity],
    bundledDatabasePath: null,
    defaultColumns: const [
      SqfEntityField('lastUpdate', DbType.datetime),
    ]);
```

--------------------------------

### Filter with Brackets and OR Conditions (2)

Source: https://pub.dev/packages/sqfentity

Selects specific fields and applies filtering with brackets for OR conditions, combined with AND. This example demonstrates filtering by price range and description patterns.

```dart
await Product().select(columnsToSelect:["name","price"])
   .price.lessThanOrEquals(10000)
   .and.startBlock.description.contains("128").or.description.endsWith("GB").endBlock
   .toList()
```

--------------------------------

### Complex Filter with Brackets

Source: https://pub.dev/packages/sqfentity_gen/example

Retrieves a single product where the price is greater than 10000 AND (description contains '256' OR description starts with '512'). This is equivalent to `SELECT TOP 1 * FROM PRODUCTS WHERE price>10000 AND (description LIKE '%256%' OR description LIKE '512%')`.

```dart
final singleProduct = await Product()
      .select()
      .price
      .greaterThan(10000)
      .and
      .startBlock
      .description
      .contains('256')
      .or
      .description
      .startsWith('512')
      .endBlock
      .toSingle();
  print(
      'EXAMPLE 1.6: BRACKETS ex: SELECT TOP 1 * FROM PRODUCTS WHERE price>10000 AND (description LIKE \'%256\'% OR description LIKE \'512%\') 
 -> Product().select().price.greaterThan(10000).and.startBlock.description.contains(\'256\').or.description.startsWith(\'512\"').endBlock.toSingle((product){ // TO DO })
');
  print('Toplam ${(singleProduct != null ? '1' : '0')} sonuç listeleniyor:');
  if (singleProduct != null) {
    print(singleProduct.toMap());
  }
  print('---------------------------------------------------------------

');
```

--------------------------------

### Complex Filter with AND, OR, and Brackets

Source: https://pub.dev/packages/sqfentity

Construct complex queries using `and`, `or`, `startBlock`, and `endBlock` to replicate SQL's use of parentheses for logical grouping. This example filters products by price and a combination of description conditions.

```Dart
Product().select().price.greaterThan(10000).and.startBlock.description.contains("256").or.description.startsWith("512").endBlock.toSingle((product){ // TO DO })
```

--------------------------------

### Select Distinct Product Names

Source: https://pub.dev/packages/sqfentity

Use the `distinct` method to retrieve unique values from a specific column. This is useful for getting a list of all available product names, for example.

```dart
Product().distinct(columnsToSelect:["name"]).price.greaterThan(3000).toList();
```

--------------------------------

### Initialize SqfEntity Tables

Source: https://pub.dev/packages/sqfentity

Logs the successful initialization of SqfEntity tables for 'category', 'product', and 'todos'. This indicates the database schema is ready.

```dart
flutter >>>>>>>>>>>>>>>>>>>>>>>>>>>> SqfEntityTable of 'category' initialized successfuly
flutter >>>>>>>>>>>>>>>>>>>>>>>>>>>> SqfEntityTable of 'product' initialized successfuly
flutter >>>>>>>>>>>>>>>>>>>>>>>>>>>> SqfEntityTable of 'todos' initialized successfuly
```

--------------------------------

### Database and Table Initialization

Source: https://pub.dev/packages/sqfentity

Confirms the creation of the SqfEntity database and successful initialization of tables like 'product', 'category', and 'todos'. It also shows index creation for tables.

```dart
flutter sampleORMx01.db created successfully
flutter SQFENTITIY: Table named 'product' was initialized successfuly with create new table
flutter SQFENTITIY: alterTableIndexesQuery => [CREATE INDEX IF NOT EXISTS IDXCategorycategoryId ON product (categoryId ASC)]
flutter SQFENTITIY: Table named 'category' was initialized successfuly with create new table
flutter SQFENTITIY: Table named 'todos' was initialized successfuly with create new table
flutter SQFENTITIY: The database is ready for use
```

--------------------------------

### Identity Sequence Operations

Source: https://pub.dev/packages/sqfentity

Demonstrates operations for managing identity sequences, including getting the current value, getting the next value, and resetting the sequence.

```dart
final currentVal= await IdentitySequence().currentVal();
// result: currentVal = 9
final nextVal = await IdentitySequence().nextVal();
// result: nextVal = 10
final int nextVal2 = await IdentitySequence().nextVal();
// result: nextVal2 = 0
final int currentVal2 = await IdentitySequence().currentVal();
// result: currentVal2 = 0
final int currentVal3 = await IdentitySequence().reset();
// result: currentVal3 = 0
```

--------------------------------

### Get Identity Sequence Current and Next Values

Source: https://pub.dev/packages/sqfentity_gen/example

Demonstrates how to get the current and next values from an identity sequence using `currentVal()` and `nextVal()`. This is useful for generating unique identifiers.

```dart
final currentVal = await IdentitySequence().currentVal();
final nextVal = await IdentitySequence().nextVal();
final nextVal2 = await IdentitySequence().nextVal();
final currentVal2 = await IdentitySequence().currentVal();

print('Sample Code:\n');
print('''
  final currentVal= await IdentitySequence().currentVal();
  result: currentVal = $currentVal
  final nextVal = await IdentitySequence().nextVal();
  result: nextVal = $nextVal
  final int nextVal2 = await IdentitySequence().nextVal();
  result: nextVal2 = $nextVal2
  final int currentVal2 = await IdentitySequence().currentVal();
  result: currentVal2 = $currentVal2
  ''');
```

--------------------------------

### Defining a Sample Table with Constraints

Source: https://pub.dev/packages/sqfentity/changelog

Defines a sample 'product' table using SqfEntityTable, specifying primary key and fields with constraints like uniqueness, not null, indexing, default values, and check conditions.

```dart
const tableProduct = SqfEntityTable(
  tableName: 'product',
  primaryKeyName: 'id',
  primaryKeyType: PrimaryKeyType.integer_auto_incremental,
  fields: [
    SqfEntityField('name', DbType.text, isUnique: true, isNotNull: true, isIndex:true),
    SqfEntityField('price', DbType.real, defaultValue: 1, checkCondition: '(this)>0'),
  ],
);
```

--------------------------------

### Get Category from Product

Source: https://pub.dev/packages/sqfentity

Retrieves the associated category for a given product. Ensure the Product object is fetched first.

```dart
final product = await Product().getById(1);
final category = await product.getCategory();
print(category.toMap());
```

--------------------------------

### Create a Database Model with SqfEntityModel

Source: https://pub.dev/packages/sqfentity

Instantiate SqfEntityModel to define your database structure, including tables, forms, and sequences. Supports multiple databases.

```dart
@SqfEntityBuilder(myDbModel)
const myDbModel = SqfEntityModel(
    modelName: 'MyDbModel', // optional
    databaseName: 'sampleORM.db',
    password: null, // You can set a password if you want to use crypted database 
                    // (For more information: https://github.com/sqlcipher/sqlcipher)

    // put defined tables into the tables list.
    databaseTables: [tableCategory, tableProduct, tableTodo],
     // You can define tables to generate add/edit view forms if you want to use Form Generator property
    formTables: [tableProduct, tableCategory, tableTodo],
    // put defined sequences into the sequences list.
    sequences: [seqIdentity],
    bundledDatabasePath:
        null // 'assets/sample.db' // This value is optional. When bundledDatabasePath is empty then EntityBase creats a new database when initializing the database
);
```

--------------------------------

### Get Category from Product

Source: https://pub.dev/packages/sqfentity

Retrieves the associated category object for a given product. This demonstrates navigating one-to-one or many-to-one relationships.

```dart
Product.getCategory();
```

--------------------------------

### Create Model from Existing Database

Source: https://pub.dev/packages/sqfentity_gen/example

This function demonstrates how to convert an existing SQLite database into SQFEntity models. Ensure the database file is placed in the `assets` folder and declared in `pubspec.yaml`.

```dart
Future<String> createModelFromDatabaseSample() async {
/* STEP 1

  // Copy your database in /assets folder (in this sample we copied chinook.sqlite database)
  // and define your asset database in pubspec.yaml as below

flutter:
  assets:
    - assets/chinook.sqlite

*/

// STEP 2
// Run this script with this parameters.
// databaseName: Specify a name for your database to use for the database connection
// bundledDatabasePath: File path of your copied database
  final bundledDbModel = await convertDatabaseToModelBase(BundledDbModel()
    ..databaseName = 'chinook.db'
    ..bundledDatabasePath = 'assets/chinook.sqlite');

// STEP 3
// Run this function to convert the model to annotation
  final String modelConstString =
      SqfEntityConverter(bundledDbModel).createConstDatabase();

// That's all. Set clipboard to paste codes
  await Clipboard.setData(ClipboardData(text: modelConstString));

  /*
      Model were created successfully and set to the Clipboard. 

      STEP 1:
      Open model.dart file in lib/model folder and paste (Ctrl+V) models after following line
      part 'model.g.view.dart';

      STEP 2:
      Go Terminal Window and run command below
      flutter pub run build_runner build --delete-conflicting-outputs
      Your Entity models will be created in lib/model/model.g.dart

 */
  print('''Your ${bundledDbModel.databaseName} 
      were created successfully and set to the Clipboard. 

      STEP 1:
      Open model.dart file in lib/model folder and paste models after following line
      part 'model.g.dart';

      STEP 2:
      Go Terminal Window and run command below
      flutter pub run build_runner build --delete-conflicting-outputs
      Your Entity models will be created in lib/model/model.g.dart''');

  return modelConstString;
}
```

--------------------------------

### SqfEntity Identity Sequence Operations

Source: https://pub.dev/packages/sqfentity

Demonstrates the usage of IdentitySequence for managing sequence values, including getting current, next, and resetting the sequence.

```dart
final int currentVal = await IdentitySequence().currentVal();
final int nextVal = await IdentitySequence().nextVal();
final int nextVal2 = await IdentitySequence().nextVal();
final int currentVal2 = await IdentitySequence().currentVal();

// You can reset sequence anytime
final int currentVal3 = await IdentitySequence().reset();

print("""
IdentitySequence().currentVal = $currentVal
IdentitySequence().nextVal = $nextVal
IdentitySequence().nextVal = $nextVal2
IdentitySequence().currentVal = $currentVal2
IdentitySequence().reset = $currentVal3 // returns start value
""");
```

--------------------------------

### Get and Update a Single Record

Source: https://pub.dev/packages/sqfentity_gen/example

Retrieve a single record by its ID using `getById` and then update its properties before saving the changes with the `save` method.

```dart
final product2 = await Product().getById(15);
// TO DO
// update product object if exist
if (product2 != null) {
  product2.description = '512GB SSD i7 (updated)';
  await product2.save();
  print(
      'EXAMPLE 5.3: id=15 Product item updated: ${product2.toMap().toString()}');
} else {
  print('EXAMPLE 5.3: id=15 => product not found');
}
```

--------------------------------

### Define Database Tables and Sequences with SqfEntity

Source: https://pub.dev/packages/sqfentity_base/example

Define your database tables and sequences using SqfEntity constants. This includes specifying table names, primary keys, field types, default values, relationships, and sequences. Ensure you import the necessary packages.

```dart
// STEP 1: import sqfentity package.
import 'package:sqfentity/sqfentity.dart';
import 'package:sqfentity_base/sqfentity_base.dart';


// STEP 1: define your tables as shown in the example Classes below.
// Define the 'TableCategory' constant as SqfEntityTable.
const tableCategory = SqfEntityTable(
    tableName: 'category',
    primaryKeyName: 'id',
    primaryKeyType: PrimaryKeyType.integer_auto_incremental,
    useSoftDeleting: true,
    // when useSoftDeleting is true, creates a field named 'isDeleted' on the table, and set to '1' this field when item deleted (does not hard delete)
    modelName:
        null, // SqfEntity will set it to TableName automatically when the modelName (class name) is null
    // declare fields
    fields: [
      SqfEntityField('name', DbType.text),
      SqfEntityField('isActive', DbType.bool, defaultValue: true),
    ]);

// Define the 'TableProduct' constant as SqfEntityTable.
const tableProduct = SqfEntityTable(
    tableName: 'product',
    primaryKeyName: 'id',
    primaryKeyType: PrimaryKeyType.integer_auto_incremental,
    useSoftDeleting: true,
    fields: [
      SqfEntityField('name', DbType.text),
      SqfEntityField('description', DbType.text),
      SqfEntityField('price', DbType.real, defaultValue: 0),
      SqfEntityField('isActive', DbType.bool, defaultValue: true),
      SqfEntityFieldRelationship(
          parentTable: tableCategory,
          deleteRule: DeleteRule.CASCADE,
          defaultValue: '0'), // Relationship column for CategoryId of Product
      SqfEntityField('rownum', DbType.integer,
          sequencedBy:
              seqIdentity /*Example of linking a column to a sequence */),
      SqfEntityField('imageUrl', DbType.text)
    ]);

// Define the 'Todo' constant as SqfEntityTable.
const tableTodo = SqfEntityTable(
    tableName: 'todos',
    primaryKeyName: 'id',
    useSoftDeleting:
        false, // when useSoftDeleting is true, creates a field named 'isDeleted' on the table, and set to '1' this field when item deleted (does not hard delete)
    primaryKeyType: PrimaryKeyType.integer_unique,
    defaultJsonUrl:
        'https://jsonplaceholder.typicode.com/todos', // optional: to synchronize your table with json data from webUrl

    // declare fields
    fields: [
      SqfEntityField('userId', DbType.integer),
      SqfEntityField('title', DbType.text),
      SqfEntityField('completed', DbType.bool, defaultValue: false)
    ]);

// Define the 'identity' constant as SqfEntitySequence.
const seqIdentity = SqfEntitySequence(
  sequenceName: 'identity',
  maxValue:  10000, /* optional. default is max int (9.223.372.036.854.775.807) */
  //modelName: 'SQEidentity',
                      /* optional. SqfEntity will set it to sequenceName automatically when the modelName is null*/
  //cycle : false,    /* optional. default is false; */
  //minValue = 0;
                      /* optional. default is 0 */
  //incrementBy = 1;
                      /* optional. default is 1 */
  // startWith = 0;   /* optional. default is 0 */
);

// STEP 2: Create your Database Model constant instanced from SqfEntityModel
// Note: SqfEntity provides support for the use of multiple databases. So you can create many Database Models and use them in the application.
@SqfEntityBuilder(myDbModel)
const myDbModel = SqfEntityModel(
    modelName: null,
    databaseName: 'sampleORM.db',
    // put defined tables into the tables list.
    databaseTables: [tableCategory, tableProduct, tableTodo],
    // put defined sequences into the sequences list.
    sequences: [seqIdentity],
    bundledDatabasePath:
        null // 'assets/sample.db' // This value is optional. When bundledDatabasePath is empty then EntityBase creats a new database when initializing the database
);

/* STEP 3: That's All.. 
--> Go Terminal Window and run command below
    flutter pub run build_runner build --delete-conflicting-outputs
  Note: After running the command Please check lib/model/model.g.dart 
  Enjoy.. Huseyin TOKPINAR
*/


void main(List<String> args) async {
  
  
  // Run Entity Model samples
  // ATTENTION! when the software/app is started, you must check the database was it initialized.
  // If needed, initilizeDb method runs CREATE / ALTER TABLE query for you.
  final bool isInitialized = await MyDbModel().initializeDB();
  if (isInitialized == false) {
    // If the database is not initialized, something went wrong. Check DEBUG CONSOLE for alerts
    // TO DO
    return;
  }
}

class MyDbModel extends SqfEntityModelProvider{

}
```

--------------------------------

### Filter with NOT Keyword

Source: https://pub.dev/packages/sqfentity

Excludes records that meet a specified condition using the 'NOT' keyword. This example excludes products with an ID greater than 5.

```dart
await Product().select().id.not.greaterThan(5).toList()
```

--------------------------------

### List Products of a Category

Source: https://pub.dev/packages/sqfentity_gen/example

Fetches all categories and then lists the products associated with each category. Prints the count and details of products for each category.

```dart
final categoryList = await Category().select().toList();
  for (var category in categoryList) {
    final productList = await category.getProducts()!.toList();
    print(
        'EXAMPLE 7.2.${category.id}: Products of \'${category.name}\' listing \n-> category.getProducts((productList) {}); ');
    // PRINT RESULTS TO DEBUG CONSOLE
    print('${productList.length} matches found:');
    for (int i = 0; i < productList.length; i++) {
      print(productList[i].toMap());
    }
    print('---------------------------------------------------------------');
    return;
  }
  return;
```

--------------------------------

### Declare SqfEntityFieldVirtual for Virtual Property

Source: https://pub.dev/packages/sqfentity_gen/changelog

Example of declaring a virtual field 'fullName' in a model. This field is generated in the model class but not in the database table.

```dart
const tablePerson = SqfEntityTable(
    tableName: 'person',
    primaryKeyName: 'id',
    primaryKeyType: PrimaryKeyType.integer_auto_incremental,
    fields: [
        SqfEntityField('firstName', DbType.text),
        SqfEntityField('lastName', DbType.text),
        SqfEntityFieldVirtual('fullName', DbType.text),
    ],
    customCode: '''
        init()
        {
        fullName = '\'firstName \'lastName';
        }
    '''
    );
```

--------------------------------

### Select Products by Price, Name, and Description

Source: https://pub.dev/packages/sqfentity_gen/example

Retrieves a list of products filtered by price range, name containment, and description containment. Useful for searching products with specific criteria.

```dart
productList = await Product()
      .select()
      .price
      .between(minPrice, maxPrice)
      .and
      .name
      .contains(nameContains)
      .and
      .description
      .contains(descriptionContains)
      .toList();
```

--------------------------------

### Preload Child Products in Category

Source: https://pub.dev/packages/sqfentity_gen/changelog

Demonstrates how to preload 'plProducts' for a Category using the 'preloadFields' parameter. Accessing preloaded products is shown.

```dart
final category = await Category().select()..(your optional filter)...toSingle(preload:true, preloadFields: ['plProducts']);

// you can see pre-loaded products of this category
category.plProducts[0].name
```

--------------------------------

### Import Existing SQLite Database

Source: https://pub.dev/packages/sqfentity

Import an existing SQLite database by copying it to the assets folder and configuring pubspec.yaml. Then, use convertDatabaseToModelBase to generate the model.

```dart
class BundledDbModel extends SqfEntityModelProvider {}

final bundledDbModel = await convertDatabaseToModelBase(BundledDbModel()
    ..databaseName = 'chinook.db'
    ..bundledDatabasePath = 'assets/chinook.sqlite');
```

--------------------------------

### Todo.fromWebUrl and upsertAll

Source: https://pub.dev/packages/sqfentity

Fetches a list of todos from a specified URL and upserts them into the database. This is useful for directly loading data from a remote JSON endpoint.

```APIDOC
## Todo.fromWebUrl and upsertAll

### Description
Fetches a list of todos from a specified URL and upserts them into the database. This is useful for directly loading data from a remote JSON endpoint.

### Method
```
Todo.fromWebUrl("https://jsonplaceholder.typicode.com/todos", (todosList) { ... })
await Todo().upsertAll(todosList);
```

### Parameters
* `url` (String) - The URL to fetch the JSON data from.
* `todosList` (List<Todo>) - A list of Todo objects to be upserted.
```

--------------------------------

### Execute Custom SQL Query and Get DataTable

Source: https://pub.dev/packages/sqfentity

Executes a custom SQL SELECT query and returns the results as a List of Maps, where each Map represents a row.

```dart
MyDbModel().execDataTable('SELECT name, price FROM product order by price desc LIMIT 5');
// print result:
// {name: Ultrabook 15", price: 14000.0}
// {name: Ultrabook 13", price: 13000.0}
// {name: Ultrabook 15", price: 12000.0}
// {name: Notebook 15", price: 11999.0}
// {name: Ultrabook 13", price: 11154.0}
```

--------------------------------

### Preload Parent Category in Product

Source: https://pub.dev/packages/sqfentity_gen/changelog

Demonstrates how to preload the parent 'plCategory' for Products. Accessing the preloaded category data for each product is shown.

```dart
final products = await Product().select().toList(preload:true);

// you see pre-loaded categories of all products
products[0].plCategory.name
```

--------------------------------

### Synchronize Data from Web URL and Save

Source: https://pub.dev/packages/sqfentity

Fetches JSON data from a web URL, loads it into a list, and then saves all items to the local database using upsertAll(). Finally, it retrieves and prints the first 10 records from the local database.

```dart
todosList = await Todo.fromWebUrl("https://jsonplaceholder.typicode.com/todos");
  final results = await Todo().upsertAll(todosList);

  // print upsert Results
  for (var res in results) {
    print(res.toString()); 
  }

  todosList = await Todo().select().top(10).toList();
  print(todosList.length.toString() + " matches found\n");
  for (var todo in todosList) {
    print(todo.toMap());
  }
```

--------------------------------

### Run Build Runner for Model Generation

Source: https://pub.dev/packages/sqfentity

Execute the build_runner command to generate model files after defining your database model.

```bash
flutter pub run build_runner build --delete-conflicting-outputs
```

--------------------------------

### DELETE multiple records with query

Source: https://pub.dev/packages/sqfentity

This section illustrates how to delete multiple records from the database that match a given query. The example provided deletes all products with an ID greater than 17.

```APIDOC
## DELETE multiple records with query #
EXAMPLE 6.4: DELETE PRODUCT WHERE ID>17
```dart
final result = await Product().select().id.greaterThan(17).delete();
print(result.toString());

```
```

--------------------------------

### Create Multiple Product Records Quickly

Source: https://pub.dev/packages/sqfentity

Efficiently add multiple product records using the withFields() constructor for quick data entry.

```dart
await Product.withFields( "Notebook 12\"", "128 GB SSD i7", 6899, true, notebookCategoryId, 0, false).save();
await Product.withFields( "Notebook 12\"", "256 GB SSD i7", 8244, true, notebookCategoryId, 0, false).save();
await Product.withFields( "Notebook 12\"", "512 GB SSD i7", 9214, true, notebookCategoryId, 0, false).save();
await Product.withFields( "Notebook 13\"", "128 GB SSD", 8500, true, notebookCategoryId, 0, false).save();
await Product.withFields( "Notebook 13\"", "256 GB SSD", 9900, true, notebookCategoryId, 0, false).save();
await Product.withFields( "Notebook 13\"", "512 GB SSD", 11000, null, notebookCategoryId, 0, false).save();
await Product.withFields( "Notebook 15\"", "128 GB SSD", 8999, null, notebookCategoryId, 0, false).save();
await Product.withFields( "Notebook 15\"", "256 GB SSD", 10499, null, notebookCategoryId, 0, false).save();
await Product.withFields( "Notebook 15\"", "512 GB SSD", 11999, true, notebookCategoryId, 0, false).save();

await Product.withFields( "Ultrabook 13\"", "128 GB SSD i5", 9954, true, ultrabookCategoryId, 0, false).save();
await Product.withFields( "Ultrabook 13\"", "256 GB SSD i5", 11154, true, ultrabookCategoryId, 0, false).save();
await Product.withFields( "Ultrabook 13\"", "512 GB SSD i5", 13000, true, ultrabookCategoryId, 0, false).save();
await Product.withFields( "Ultrabook 15\"", "128 GB SSD i7", 11000, true, ultrabookCategoryId, 0, false).save();
await Product.withFields( "Ultrabook 15\"", "256 GB SSD i7", 12000, true, ultrabookCategoryId, 0, false).save();
await Product.withFields( "Ultrabook 15\"", "512 GB SSD i7", 14000, true, ultrabookCategoryId, 0, false).save();
```

--------------------------------

### Import necessary packages for SqfEntity model

Source: https://pub.dev/packages/sqfentity

Import required packages for SqfEntity model definition and Flutter development.

```dart
import 'dart:convert';
import 'dart:typed_data';
import 'package:flutter_datetime_picker/flutter_datetime_picker.dart';
import 'package:http/http.dart' as http;
import 'package:flutter/material.dart';
import 'package:sqfentity/sqfentity.dart';
import 'package:sqfentity_gen/sqfentity_gen.dart';
import '../tools/helper.dart';
import 'view.list.dart';
```

--------------------------------

### Select Products Between Datetimes

Source: https://pub.dev/packages/sqfentity_gen/example

Filters products based on a datetime range. Note: The example uses a string-based WHERE clause for datetime comparison, which might require specific database formatting.

```dart
productList = await Product()
      .select()
      .where(
          'datetime BETWEEN \'${DateTime(2020, 1, 1, 14)}\' AND \'${DateTime(2020, 1, 1, 14).millisecondsSinceEpoch}\'')
      .toList();
```