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https://github.com/ustims/DartORM

Database ORM for dart language
https://github.com/ustims/DartORM

dart database database-orm orm

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Database ORM for dart language

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Dart ORM

========



Easy-to-use and easy-to-setup database ORM for dart.



It is in the very beginning stage of development and not ready for production use.



Any feedback is greatly appreciated.



Feel free to contribute!



Features

========



Annotations

-----------



Annotations could be used in-place:



```dart

import 'package:dart_orm/orm.dart' as ORM;



@ORM.DBTable('users')

class User extends ORM.Model {

  // Every field that needs to be stored in database should be annotated with @DBField

  @ORM.DBField()

  @ORM.DBFieldPrimaryKey()

  int id;



  @ORM.DBField()

  String givenName;



  // column name can be overridden

  @ORM.DBField('family_name')

  String familyName;

}

```



Or one can provide a target class for DBTable annotation. 

In such way one can store third-party classes in database without changing the original class definition.



```dart



// somelibrary.dart

class User {

  int id;

  String name;

}



// your code

import 'somelibrary.dart' as lib;



@ORM.Table('users', lib.User)

class DBUser {

  @ORM.DBField()

  int id;

  

  @ORM.DBField()

  String name;

}



// now User instances could be used like this:

lib.User u = new lib.User();

u.name = 'Name';

await ORM.insert(u);



// Note that DBUser is used only for annotation purposes and should not be used directly.

```



Types support

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



Any simple Dart type could be used: int/double/String/bool/DateTime.



Lists are supported and could be used as any other type just by annotating a property:



```dart

@ORM.DBTable('users')

class User {

  @ORM.DBField()

  List emails;

}

```



References to other tables are not supported, but are in progress. Stay tuned!



Inserts and updates

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



Every ORM.Model has .save() method which will update/insert a new row.



If class instance has 'id' field with not-null value,

.save() will execute 'UPDATE' statement with 'WHERE id = $id'.



If class instance has null 'id' field, 'INSERT' statement will be executed.



```dart

User u = new User();

u.givenName = 'Sergey';

u.familyName = 'Ustimenko';



var saveResult = await u.save();

```



This statement will be executed on save():



```sql

INSERT INTO users (

    given_name,

    family_name)

VALUES (

    'Sergey',

    'Ustimenko'

);

```



Queries

-------



ORM has two classes for finding records: Find and FindOne.



Constructors receive a class that extend ORM.Model.



```dart



ORM.Find f = new ORM.Find(User)

  ..where(new ORM.LowerThan('id', 3)

    .and(new ORM.Equals('givenName', 'Sergey')

      .or(new ORM.Equals('familyName', 'Ustimenko'))

    )

  )

  ..orderBy('id', 'DESC')

  ..setLimit(10);



List foundUsers = await f.execute();



for(User u in foundUsers){

  print('Found user:');

  print(u);

}

```



This will result such statement executed on the database:



```sql

SELECT *

FROM users

WHERE id < 3 AND (given_name = 'Sergey' OR family_name = 'Ustimenko')

ORDER BY id DESC LIMIT 10

```



Multiple database adapters support

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



Server-side adapters:



https://github.com/ustims/DartORM-PostgreSQL



https://github.com/ustims/DartORM-MySQL



https://github.com/ustims/DartORM-MongoDB



To use an adapter install it with pub and do this:



```dart

import 'package:dart_orm_adapter_postgresql/dart_orm_adapter_postgresql.dart';

import 'package:dart_orm/dart_orm.dart' as orm;



main() {

  orm.AnnotationsParser.initialize();



  String connectionString =

      'postgres://:@localhost:5432/';

      

  orm.DBAdapter postgresAdapter = new PostgresqlDBAdapter(connectionString);

  await postgresAdapter.connect();

  

  orm.addAdapter('postgres', postgresAdapter);

  orm.setDefaultAdapter('postgres');

  

  await orm.Migrator.migrate();

}

```      



DartORM could also be used on client side with indexedDB:



https://github.com/ustims/DartORM-IndexedDB



Roadmap

=======



- model relations (in progress)

- migration system