Preprocess Query on a View

Any help would be fab...
In my project I have built a SqL view that combines a number tables for an MI report which I have imported into Lightswitch. This new Lightswitch table (view) has no additional relationships as all Foreign keys on related tables are already consumed by existing
collections (and therefore hidden within EF).
I need to run this table through a query pre-process to restrict the number of rows returned as it is on one side of a many-to-many relationship
[Property]<-----[Properties_In_Region]----->[Region]
I have been trying many ways to setup the pre-process all to no avail. Manual linq joins do not seem to be supported so I reverted to writing an initial query to return the associative table (Properties_In_Region) to then join to the query. I noticed however
that the initial query needed t be IEnumerable, however I cant seem to get the syntax even for that...my code is.....
partial void Q_V_MI_People_Projects_PreprocessQuery(long? Person_Region_ID, long? Property_Region_ID, ref IQueryable<V_MI_People_Project> query)
IEnumerable<Region_Ass_SiteProperty> Properties_In_Region = DataWorkspace.POL_PSOData.Region_Ass_SiteProperties.Where(a => a.Region.ID == Property_Region_ID);
query = from MI in query
join PR in Properties_In_Region
on MI.Property_ID equals PR.Region.ID
select MI;
This is the only combination (with an IEnumerable type) that I can get anywhere close to the query working. However even with this option the line starting with IEnumerable failes with a conversion error...one that I cant seem to fix.
I assume that this should be easy, but no matter what I try there seems to be a conversion error, something of the syntax:
Cannot implicitly convert type 'Microsoft.LightSwitch.IDataServiceQueryable<LightSwitchApplication.Region_Ass_SiteProperty>' to 'System.Collections.Generic.IEnumerable<LightSwitchApplication.Region_Ass_SiteProperty>'. An explicit conversion exists
(are you missing a cast?)
Regional_Assignments = from RS in DataWorkspace.POL_PSOData.Region_Ass_SiteProperties
where RS.Region.ID == Property_Region_ID
select RS;
query= from MI in query
join PR in Regional_Assignments
on MI.Property_ID equals PR.Region.ID
select MI;
I also tried to do it via a Contains (IN) clause, but the syntax for a .contains does now appear....SQL was so much easier :)
I also tried this combination but the Join fails
Does anyone have a suggestions?
Thanks

Hi,
May be I'm not sure what you want to achieve. I use the prerocess query in this way
partial void Q_V_MI_People_Projects_PreprocessQuery(long? Person_Region_ID, long? Property_Region_ID, ref IQueryable<V_MI_People_Project> query)
query = query.where(x => x.PropertyID == PropertyRegionID and x.whateverID == Person_RegioID)
I'm sorry if the code is not exactly right, because I'm developing in VB. But in VB I will do it in this way
Hope this helps and Kind Regards
Thomas

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Select query in materialized view with two dblinks

Hi All,
We have oracle 10g On windows.
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Basa database have two schema's and i am selecting records from that two schema's using two private db links.
But when i am tryin gto create mview its not getting created. After 15 hrs. its still showing creation command and not finished.
Query is :-
Is it good practice to have two db links in select query of materialized view.

Billy Verreynne wrote:
Chanchal Wankhade wrote:
Is it good practice to have two db links in select query of materialized view.Same db link being used twice, or two different db links?
If the former, you ideally want the local Oracle db to send the join to the remote database, and for the remote database to drive the join between those 2 tables. There is a hint (<i>driving_site</i>) that can be used - or the join query can be defined on the remote database as a view, and the local materialised view can then use that remote view.
If you have 2 different db links and joining across these - usually a bad idea to perform distributed database joins. There are lots of limitations as to how the tables can be joined. Worse case, full table scans of both remote tables, pulling all the rows from the 2 remote database tables to the local database, and joining these on the local database.
I have seen some severe performance issues in the past as a result of distributed joins. I'll rather use 2 materialised views for pulling both distributed tables's data locally, and then do the join on local data (using indexes, partition pruning, etc)Hi Billy,
My scenario is i have two database database A and database B. Database A is having two schema's SCOTT AND HR. SCOTT schema have select privileges on HR schema.
DB LINK is between Database B to Database A. name is db.link.B.A.oracle.com.
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Above schnario is like two base schema's and one db link using two schema.

Query SharePoint List View

As per http://msdn.microsoft.com/en-us/library/ms434064.aspx if we use
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Hello,
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http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.spview.query.aspx
Hemendra:Yesterday is just a memory,Tomorrow we may never see
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Snowflake dimension: named query vs. database view

A test question features a Product table with a Product Size code; Product Size description is taken from ProductSize table. As far as I can tell, the question asks me to choose between (a) setting up a database view joining Product and ProductSize, and
(b) doing the join in a data-source-view named query. I don't see a clear winner. (My thinking is as follows. Yes, he view would speed up the processing, even if not materialized. On the other hand, with a small dataset, the performance gain would be
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Hi Demyan,
According to your description, you want to know which is better, using named query in datasource view or using database view, right?
Based on my research, there is no performance differences between using named query in datasource view and using database view because they both result in SQL query being sent to the source system. Here is a blog which discuss this issue.
Consistency: If you already have logic in database views, I would continue to use them. As long as you know that you go to one spot to view/change the logic. Putting the logic in 2 different spots could lead to confusion.
Security Permissions: often you may not have permission to alter the source databases, in this case you have no choice but to setup named queries in the dsv.
Reference
http://geekswithblogs.net/darrengosbell/archive/2006/09/05/90278.aspx
http://bennyaustin.wordpress.com/2013/07/16/dbview/
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Charlie Liao
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Changing the query on a view object

I have a view object right now, based on an entity. It is the default view object, so that means the query in the view object is straight forward, it grabs all of the attributes from the table. And there is no WHERE clause.
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12, 11:55, Thompson, 75
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I went to my VO, and I changed the WHERE query to add this:
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When I save the new WHERE to my VO, run my page again, I get the expected result (showing me only the latest records).
However, when I try and sort on the table in which my data is displayed, I am now getting ORDER BY errors.
I don't want my VO to be read-only sql based. I want to be able to update my table, so I have my VO running off of the entity.
Why doesn't the VO allow me to change the query itself? (Like do a subquery, instead of having my where clause do the work)
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Hopefully I wasn't too convoluted in the explanation of my problem..
Thanks in advance,
Joel

HI Joe,
Regarding your problem you can do one of the following tasks:
1- easily to tuning on your view object, I mean in the tuning page of the view you can set that only return 1 record or 2-3 record fetch not all the record.
in the order by you will order by the timestamp field and descending.
2- you can order by the timestamp descending and in the where clause only set the rownum<2 (will return the last record) you can also set rownum<5 and get the 4 last record etc.
3-editing the view query in the expert mode is not advised at all because of many consequences that you will face.
4- maybe it is not bat that you add a readonly view for the table you mentioned and every time you unpdate the entity just re-execute the read-only view.( this method maybe is good maybe is not it depends on your business logic)
Regards.
Edited by: Amir Khanof on Sep 3, 2010 11:11 PM

Running a query in a View Designer results in an error, but running the same query in a Query window works

Hi everyone,
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Hi Radu,
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If your SELECT query and SELECT * FROM YourView works fine in Query designer, you are good to go.
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Hi All,
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Thanks All!!
I think, this range limit has caused the problem. Range limit is 999 records.
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kokrs = c_kokrs_mbca.
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Thanks a lot for ur help!!!!
Navita

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ERROR at line 1:
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ERROR at line 1:
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Encapsulating a query in a view with "parameters"

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select * from (
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SYS_CONTEXT would work, as would package global variables.
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Can we write a select query on maint. view? If not what are the views on which we can write the select queries?

hi,
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Hello Gurus,
I would really appreciate your time and effort regarding this query. I have the following data set.
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1234567----------11223-------------- 7/5/2008----------paid for cleaning----------------------44345563------------------I-----------------*10.00*------------19
7654321----------11223--------------7/5/2008-----------Adjustment from last billing cycle-----23543556-------------------A--------------------50.00--------------19
4653456----------11223--------------7/5/2008-----------paid for cleaning------------------------35654765-------------------I---------------------30.00--------------19
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select B.Description, A.sequence_id,A.check_date, A.check_number, A.invoice_number, A.amount, A.vendor_number
from (
select sequence_id,check_date, check_number, invoice_number, sum(paid_amount) amount, vendor_number
from INVOICE
group by sequence_id,check_date, check_number, invoice_number, vendor_number
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It looks like it is a duplicate thread - correct me if i'm wrong in this case ->
Need help with SQL Query with Inline View + Group by
Regards.
Satyaki De.

Query's Quick Viewer Simulation.

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HI,
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thanks and appreciate all kind of advice.

When you add a List View Web Part to a page, SharePoint actually copies the selected view query into the Web Part itself. For example:
You create a custom view on a list called "Mede71's View" and you configure it only show the Title column
You add a List View Web Part to a page and update the settings to use the "Mede71's View"
You go back to your list and change "Mede71's View" and add the "Modified Date" column
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Hi,
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SELECT * FROM "MyApp.calculation_views::GET_CHECKLIST_FOR_ACCOUNT"('PLACEHOLDER' = ('$$ACCOUNT_ID$$', '1','$$CHECKLIST_ID$$',' SELECT CHECKLIST_ID FROM "MyApp"."CHECKLIST_PRODUCTS" WHERE PRODUCT_ID = 5'));
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var_id VARCHAR(10);
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END
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Best,
Henrique.
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HTML Client: post process a preprocess query?

I am trying to set up a method for quoting jobs and keeping track of parts for the quote. Many quotes can have many parts, so I have a many to many relationship between Quotes and Parts via a table called QuoteParts.
I am trying to design an Add Edit Quote screen with two tabs: one has the quote details and a list of parts for this quote. The other tab has a list of parts available to go on the quote. I have it set so when you tap the item in the list not added to the
quote, it adds the QuotePart and the part moves from the list of available parts to the quote.
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to the screen and has not been saved yet. If I save and reopen the screen, all shows up fine.
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I got the idea of how to work with this via http://blogs.msdn.com/b/lightswitch/archive/2013/04/10/many-to-how-many-html-edition-heinrich-wendel.aspx

Close, try this:
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myapp.showAddEditPart(null, {
beforeShown: function (newScreen) {
var newPart = new myapp.Part();
newPart.Hardware = screen.Hardware;
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return myapp.activeDataWorkspace.ApplicationData.saveChanges().then(function () {
// Refresh the Parts that other code does not reach
screen.UsedParts.refresh();
screen.UnusedParts.refresh();
Be careful about creating global scope functions like you did: RefreshPartsLists.
Cheers
Dave
Dave Baker | AIDE for LightSwitch | Xpert360 blog | twitter : @xpert360 | Xpert360 website | Opinions are my own. For better forums, remember to mark posts as helpful/answer.

Preprocess Query on a View

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