I'm just looking for an idea for converting this pseudo code into a reactive style.
var records = new ArrayList<>();
var query = new Query();
var results = query.executeQuery();
records.addAll(results.getRecords());
while (results.hasMore()) {
query = new Query(results.offset())
deals = hubspotQuery.executeQuery(Deals.class);
records.addAll(results.getRecords());
}
The idea is to collect all records into a Flux
Here is one possible solution. Maybe there is others, but this one is simple.
This is not real code, but it describe the logic.
Flux<Records> query = createFluxQuery();
query.expand(record -> (record.hasMore()) ? createFluxQuery(record.offset) : Flux.empty());
Related
Hi I would like to get all items of a container in a database in cosmos DB. I can see that there are already a lot of methods available but I don't see any getAllItems or a lookalike.
Is there an easy way to do it like using LINQ or something?
Thanks
If you want to do this using Linq, you can do the following (As suggested in this answer here: How can I use LINQ in CosmosDB SDK v3.0 async query?):
var db = Client.GetDatabase(databaseId);
var container = db.GetContainer(containerId);
var q = container.GetItemLinqQueryable<Person>();
var iterator = q.ToFeedIterator();
var results = await iterator.ReadNextAsync();
If you want a non-Linq solution, use this (taken from the v3 SDK samples: https://github.com/Azure/azure-cosmos-dotnet-v3/blob/master/Microsoft.Azure.Cosmos.Samples/Usage/ItemManagement/Program.cs#L259:
QueryDefinition query = new QueryDefinition(
"select * from sales s where s.AccountNumber = #AccountInput ")
.WithParameter("#AccountInput", "Account1");
FeedIterator<SalesOrder> resultSet = container.GetItemQueryIterator<SalesOrder>(
query,
requestOptions: new QueryRequestOptions()
{
PartitionKey = new PartitionKey("Account1"),
MaxItemCount = 1
});
while (resultSet.HasMoreResults)
{
FeedResponse<SalesOrder> response = await resultSet.ReadNextAsync();
// Work through iterator list here
}
Hope this helps!
You can use LINQ like described in Microsoft Azures documentation.
Something like this should be the solution of your problem:
var db = Client.GetDatabase(databaseId);
var container = db.GetContainer(containerId);
//Get iterator or use some LINQ queries here
var iterator = container.GetItemLinqQueryable<YourType>().GetEnumerator();
How can I find (preferably using CRM Linq) parent entities that have 0 children. For example how can I find all accounts that have 0 contacts.
If you are going to use the query expression route, which I would recommend then the following code will be useful
var entityAlias = "con";
var query = new QueryExpression
{
EntityName = "account",
ColumnSet = new ColumnSet(true),
Criteria =
{
FilterOperator = LogicalOperator.And,
Conditions =
{
new ConditionExpression(entityAlias, "contactid",ConditionOperator.Null)
}
}
LinkEntities =
{
new LinkEntity
{
EntityAlias = entityAlias,
LinkFromEntityName = "account",
LinkFromAttributeName = "accountid",
LinkToEntityName = "contact",
LinkToAttributeName = "parentcustomerid",
Columns = new ColumnSet("parentcustomerid", "contactid"),
JoinOperator = JoinOperator.LeftOuter,
}
},
};
var response = service.RetrieveMultiple(query);
var accounts = response.Entities;
In this code I have not limited the columns, this will reduce performance and you should only return the columns needed.
If there is the case for more than 5000 records are going to be returned then you will need to use paging and loop the query to find all the entities,
This can be found here:
https://msdn.microsoft.com/en-us/library/gg327917.aspx
However if you are certain you want to use LINQ then you can use the following code:
public static IEnumerable<Account> FindAccountsWithNoContacts()
{
var contactRelationship = new Relationship("contact_customer_accounts");
foreach(var account in XrmContext.AccountSet)
{
XrmContext.LoadProperty(contactRelationship);
if(!account.RelatedEntities.ContainsKey(contactRelationship)
yield return account;
}
}
My problem with the LINQ code is that all the enities, both the account and contact entities, will be loaded into memory. With large entity sets this can cause OutOfMemoryException, whereas the query expression route will pass the query to the Dynamics server to execute; which should make the execution of the code faster.
The thing you are looking for is left outer join. Which is unfortunately not possible in CRM using LINQ. However you can do it using query expression or FetchXML.
Here is a link that can help you:
https://community.dynamics.com/crm/b/gonzaloruiz/archive/2014/02/23/all-about-outer-join-queries-in-crm-2011-and-crm-2013
I have this bit of code that does not work because Entity Framework doesn't recognize the CreateItemDC method. CreateItemDC is a modular private method that creates a data contract for the given Item entity. I use CreateItemDC all throughout my service whenever I need to return an Item data contract, but I can't use it here. I can realize the sequence of ProjectItems into an array or enumerable because I would have to do this to all ProjectItem entities in my database as the query criteria is specified on the client and I don't have access to it here. Do I have any better options here? It seems that RIA Services is not worth the trouble. I'm really wishing I had used plain WCF with this project.
[Query]
public IQueryable<ProjectItemDC> GetProjectItems()
{
return from projectItem in ObjectContext.ProjectItems
select new ProjectItemDC
{
ID = projectItem.ID,
LibraryItem = CreateItemDC(projectItem.LibraryItem),
LibraryItemID = projectItem.LibraryItemID,
ProjectID = projectItem.ProjectID,
Quantity = projectItem.Quantity,
Width = projectItem.Width,
Height = projectItem.Height,
Depth = projectItem.Depth,
SheetMaterialID = projectItem.SheetMaterialID,
BandingMaterialID = projectItem.BandingMaterialID,
MaterialVolume = projectItem.MaterialVolume,
MaterialWeight = projectItem.MaterialWeight
};
}
P.S. I do love LINQ and E.F. though. :)
Well, if you want to go with plain WCF, you can, no problem, just change the code to
[Query(IsComposable=false)]
public IEnumerable<ProjectItemDC> GetProjectItems(string myParm1, string myParm2)
{
return from projectItem in ObjectContext.ProjectItems
select new ProjectItemDC
{
ID = projectItem.ID,
LibraryItem = CreateItemDC(projectItem.LibraryItem),
LibraryItemID = projectItem.LibraryItemID,
ProjectID = projectItem.ProjectID,
Quantity = projectItem.Quantity,
Width = projectItem.Width,
Height = projectItem.Height,
Depth = projectItem.Depth,
SheetMaterialID = projectItem.SheetMaterialID,
BandingMaterialID = projectItem.BandingMaterialID,
MaterialVolume = projectItem.MaterialVolume,
MaterialWeight = projectItem.MaterialWeight
}.ToArray();
}
write your own filtering/sorting logic and you're done.
Yes, you've lost WCF Ria Services dynamic query capabilities, but this is pretty much what you get with plain old WCF, isnt'it ?
If you instead need WCF Ria dynamic sorting/filtering/grouping you must take some additional steps, involving the visit of the Expression that WCF Ria Services create for you.
HTH
You can call ToArray() against ObjectContext.ProjectItems to force EF to load all the items, however, your query will no longer be composable on the client.
[Query]
public IQueryable<ProjectItemDC> GetProjectItems()
{
return from projectItem in ObjectContext.ProjectItems.ToArray()
select new ProjectItemDC
{
ID = projectItem.ID,
LibraryItem = CreateItemDC(projectItem.LibraryItem),
LibraryItemID = projectItem.LibraryItemID,
ProjectID = projectItem.ProjectID,
Quantity = projectItem.Quantity,
Width = projectItem.Width,
Height = projectItem.Height,
Depth = projectItem.Depth,
SheetMaterialID = projectItem.SheetMaterialID,
BandingMaterialID = projectItem.BandingMaterialID,
MaterialVolume = projectItem.MaterialVolume,
MaterialWeight = projectItem.MaterialWeight
};
}
Edit:
As mentioned in your comment, it gets all of the data out of the database at once which is not ideal. In order to create the LibraryItem with your private method, you cannot compose the query on the client. Instead, you should filter within the query method and then create the array.
[Query]
public IQueryable<ProjectItemDC> GetProjectItems(int id, string filter, object blah)
{
var projectItems = ObjectContext.ProjectItems.Where(...).ToArray();
return projectItems.Select(projectItem => new ProjectItemDC{...};
}
I am working with code first approach in EDM and facing an error for which I can't the solution.Pls help me
LINQ to Entities does not recognize the method 'Boolean
CheckMeetingSettings(Int64, Int64)' method, and this method cannot be
translated into a store expression.
My code is following(this is the query which I have written
from per in obj.tempPersonConferenceDbSet
where per.Conference.Id == 2
select new PersonDetials
{
Id = per.Person.Id,
JobTitle = per.Person.JobTitle,
CanSendMeetingRequest = CheckMeetingSettings(6327,per.Person.Id)
}
public bool CheckMeetingSettings(int,int)
{
///code I have written.
}
Please help me out of this.
EF can not convert custom code to SQL. Try iterating the result set and assigning the property outside the LINQ query.
var people = (from per in obj.tempPersonConferenceDbSet
where per.Conference.Id == 2
order by /**/
select new PersonDetials
{
Id = per.Person.Id,
JobTitle = per.Person.JobTitle,
}).Skip(/*records count to skip*/)
.Take(/*records count to retrieve*/)
.ToList();
people.ForEach(p => p.CanSendMeetingRequest = CheckMeetingSettings(6327, p.Id));
With Entity Framework, you cannot mix code that runs on the database server with code that runs inside the application. The only way you could write a query like this, is if you defined a function inside SQL Server to implement the code that you've written.
More information on how to expose that function to LINQ to Entities can be found here.
Alternatively, you would have to call CheckMeetingSettings outside the initial query, as Eranga demonstrated.
Try:
var personDetails = obj.tempPersonConferenceDbSet.Where(p=>p.ConferenceId == 2).AsEnumerable().Select(p=> new PersonDetials
{
Id = per.Person.Id,
JobTitle = per.Person.JobTitle,
CanSendMeetingRequest = CheckMeetingSettings(6327,per.Person.Id)
});
public bool CheckMeetingSettings(int,int)
{
///code I have written.
}
You must use AsEnumerable() so you can preform CheckMeetingSettings.
Linq to Entities can't translate your custom code into a SQL query.
You might consider first selecting only the database columns, then add a .ToList() to force the query to resolve. After you have those results you van do another select where you add the information from your CheckMeetingSettings method.
I'm more comfortable with the fluid syntax so I've used that in the following example.
var query = obj.tempPersonConferenceDbSet
.Where(per => per.Conference.Id == 2).Select(per => new { Id = per.Person.Id, JobTitle = per.Person.JobTitle })
.ToList()
.Select(per => new PersonDetails { Id = per.Id,
JobTitle = per.JobTitle,
CanSendMeetingRequest = CheckMeetingSettings(6327, per.Person.Id) })
If your CheckMeetingSettings method also accesses the database you might want to consider not using a seperate method to prevent a SELECT N+1 scenario and try to express the logic as part of the query in terms that the database can understand.
I have an entity called Invoice and an entity called InvoiceItem.
There is a one to many relationship called new_invoice_invoiceitem.
There is a LookupAttribute in InvoiceItem called new_parent_invoice_invoiceitem.
I am trying to retrieve the InvoiceItems that are related to the Invoice with a particular ID using the following code:
QueryExpression query = new QueryExpression();
query.EntityName = "new_invoiceitem";
query.ColumnSet = new AllColumns();
ConditionExpression condition = new ConditionExpression();
condition.AttributeName = "new_parent_invoice_invoiceitem";
condition.Values = new object [] { new Guid("fe1009cc-e034-49d5-bc59-ab4c3091a6f9") };
condition.Operator = ConditionOperator.Equal;
FilterExpression filter = new FilterExpression();
filter.AddCondition(condition);
query.Criteria = filter;
RetrieveMultipleRequest request = new RetrieveMultipleRequest();
request.Query = query;
RetrieveMultipleResponse response = (RetrieveMultipleResponse)crmService.Execute(request);
BusinessEntityCollection bec = response.BusinessEntityCollection;
The code runs without errors but the BusinessEntityCollection is always empty even though there are records in Dynamics.
Any idea what I'm doing wrong?
Thanks,
David
Try setting request.ReturnDynamicEntities = true