public IEnumerable <T> ExecuteCollection <T>(QueryModel queryModel)
{
var visitor = new QueryVisitor(_typeDescription);
visitor.VisitQueryModel(queryModel);
Expression = visitor.RootExpression;
return(Enumerable.Empty <T>());
}
// Executes a query with a collection result.
public IEnumerable <T> ExecuteCollection <T>(QueryModel queryModel)
{
var visitor = new QueryVisitor(_typeDescription);
visitor.VisitQueryModel(queryModel);
var expression = visitor.RootExpression;
_customAction?.Invoke(expression);
Dbg.Trace($"linq provider produced expression {expression}");
return(_client.GetMany <T>(visitor.RootExpression));
}
// Executes a query with a collection result.
public IEnumerable <T> ExecuteCollection <T>(QueryModel queryModel)
{
var visitor = new QueryVisitor(_collectionName, _collectionSchema);
visitor.VisitQueryModel(queryModel);
var expression = visitor.RootExpression;
_customAction?.Invoke(expression);
Dbg.Trace($"linq provider produced expression {expression}");
return(_client.GetMany(visitor.RootExpression, _sessionId).Select(ri => FromJObject <T>(ri.Item)));
}
// Executes a query with a scalar result, i.e. a query that ends with a result operator such as Count, Sum, or Average.
public T ExecuteScalar <T>(QueryModel queryModel)
{
var visitor = new QueryVisitor(_typeDescription);
visitor.VisitQueryModel(queryModel);
var expression = visitor.RootExpression;
_customAction?.Invoke(expression);
Dbg.Trace($"linq provider produced expression {expression}");
if (expression.CountOnly)
{
return((T)(object)_client.EvalQuery(expression).Value);
}
throw new NotSupportedException("Only Count scalar method is implemented");
}
