Building a QueryExpression where name field is either A or B
- by Mike
I'm trying to build a Dynamics CRM 4 query so that I can get calendar events that are named either "Event A" or "Event B".
A QueryByAttribute doesn't seem to do the job as I cannot specify a condition where the field called "event_name" = "Event A" of "event_name" = "Event B".
When using the QueryExpression, I've found the FilterExpression applies to the Referencing Entity. I don't know if the FilterExpression can be used on the Referenced Entity at all. The example below is something like what I want to achieve, though this would return an empty result set as it will go looking in the entity called "my_event_response" for a "name" attribute. It's starting to look like I will need to run several queries to get this but this is less efficient than if I can submit it all at once.
ColumnSet columns = new ColumnSet();
columns.Attributes = new string[]{ "event_name", "eventid", "startdate", "city" };
ConditionExpression eventname1 = new ConditionExpression();
eventname1.AttributeName = "event_name";
eventname1.Operator = ConditionOperator.Equal;
eventname1.Values = new string[] { "Event A" };
ConditionExpression eventname2 = new ConditionExpression();
eventname2.AttributeName = "event_name";
eventname2.Operator = ConditionOperator.Equal;
eventname2.Values = new string[] { "Event B" };
FilterExpression filter = new FilterExpression();
filter.FilterOperator = LogicalOperator.Or;
filter.Conditions = new ConditionExpression[] { eventname1, eventname2 };
LinkEntity link = new LinkEntity();
link.LinkCriteria = filter;
link.LinkFromEntityName = "my_event";
link.LinkFromAttributeName = "eventid";
link.LinkToEntityName = "my_event_response";
link.LinkToAttributeName = "eventid";
QueryExpression query = new QueryExpression();
query.ColumnSet = columns;
query.EntityName = EntityName.mbs_event.ToString();
query.LinkEntities = new LinkEntity[] { link };
RetrieveMultipleRequest request = new RetrieveMultipleRequest();
request.Query = query;
return (RetrieveMultipleResponse)crmService.Execute(request);
I'd appreciate some advice on how to get the data I need.
