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Basic Functionality
Before starting with the ORM, it is highly recommended to familiar one's self with
package:angel_serialize, as it is the foundation for package:angel_orm:To enable the ORM for a given model, simply add the
@orm annotation to its definition:1
@orm
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@serializable
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abstract class _Todo {
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bool get isComplete;
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String get text;
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@Column(type: ColumnType.long)
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int get score;
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}
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The generator will produce a
TodoQuery class, which contains fields corresponding to each field declared in _Todo. Each of TodoQuery's fields is a subclass of SqlExpressionBuilder, corresponding to the given type. For example, TodoQuery would look something like:1
class TodoQuery extends Query<Todo, TodoQueryWhere> {
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BooleanSqlExpressionBuilder get isComplete;
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StringSqlExpressionBuilder get text;
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NumericSqlExpressionBuilder<int> get score;
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}
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Thus, you can query the database using plain-old-Dart-objects (PODO's):
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Future<List<Todo>> leftToDo(QueryExecutor executor) async {
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var query = TodoQuery()..where.isComplete.isFalse;
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return await query.get(executor);
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}
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Future<void> markAsComplete(Todo todo, QueryExecutor executor) async {
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var query = TodoQuery()
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..where.id.equals(todo.idAsInt)
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..values.isComplete = true;
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await query.updateOne(executor);
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}
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The glue holding everything together is the
QueryExecutor interface. To support the ORM for any arbitrary database, simply extend the class and implement its abstract methods.1
app.container.registerSingleton<QueryExecutor>(PostgresExecutor(...));
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At the time of this writing, there is only support for PostgreSQL, though more databases may be added eventually.
Last modified 2yr ago
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