/// <summary>
/// Executes INSERT operation.
/// </summary>
/// <typeparam name="T">Type of the entity.</typeparam>
/// <param name="queryEndpoint">The query endpoint.</param>
/// <param name="evaluator">The expression, tha specify new values.</param>
/// <returns>Key of the created entity.</returns>
public static Key Insert <T>(this QueryEndpoint queryEndpoint, Expression <Func <T> > evaluator) where T : Entity
{
var operation = new InsertOperation <T>(queryEndpoint.Provider, evaluator);
operation.Execute();
return(operation.Key);
}
