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Confused about using LINQ to query a SQL Server DB: edmx? dbml? DataSet?


Confused about using LINQ to query a SQL Server DB: edmx? dbml? DataSet?

By : ravi kishore
Date : November 22 2020, 11:12 AM
To fix the issue you can do In a recent post on extending NerdDinner, Scott Hanselman talked about this very thing. To quote at the end:
code :


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A Linq to Sql - Multiple .DBML files or one .DBML File

A Linq to Sql - Multiple .DBML files or one .DBML File


By : yamzeq
Date : March 29 2020, 07:55 AM
hope this fix your issue I would have to advise you to use ONE dbml file for all your tables.
If you are trying to join two tables from different data contexts, it makes your code more convoluted. It can be done by simulating cross context joins, but why put yourself in that situation. Keep it simple stupid.
Stop LINQ to SQL dbml from updating connection string when I drag tables into the dbml file

Stop LINQ to SQL dbml from updating connection string when I drag tables into the dbml file


By : Aaron
Date : March 29 2020, 07:55 AM
seems to work fine I figured out another away after tinkering with answers to some somewhat related issues.
To solve the problem I was having I needed to delete the Data Connection I created to connect to my database from your server explorer window in VS2010. You then need to open the .dbml designer and right-click in the white space and select properties. A properties window will open and there will be a "Connection" section, click on the small arrow to open it up. If you click on the connection string row a button will appear with dots(...) on it. When you click on this button it will open a Connection Properties window. This window will already have all of the same connection properties your .dbml already has. All you have to do is click 'OK' and it will automatically create a data connection for you in the server explorer that wont cause you to add a new connection string to the .dbml when you drag a new object to it!
linq to sql query with 2 dbml files

linq to sql query with 2 dbml files


By : Yu Chen
Date : March 29 2020, 07:55 AM
it fixes the issue Well, you can always limit your N+1 query problem to 3 queries - one to get users, one to get user's data form first database and one for the second database. Then connect all the results in memory - this will limit the connections to databases which should improve performance of your application.
I don't know if linq-to-sql or entity framework offers building model from different databases - this would pose some performance problems probably - like in includes or something, but I may simply not be aware of such features.
code :
var facebookIds = fbFriendsFollowStatus.Select(a => a.fbid);
var FFUserIds= FFdb.FFUsers.Where(x => facebookIds.Contains(x.FacebookID)).Select(x => new { x.FacebookID, x.FFUserId)
var statuses = EEdb.StatusTable.Where(x => FFUserIds.Contains(x.ffID)).Select(x => new { x.ffID, x.Status})
Drag and Drop From Server Explorer to DataSet and DBML Designer NOT Working

Drag and Drop From Server Explorer to DataSet and DBML Designer NOT Working


By : Adriennearthur
Date : March 29 2020, 07:55 AM
Does that help Okay, I finally solved this problem.
The problem seems to be with the Visual Database Tools DLL.
What is difference between .edmx and .dbml file in linq?

What is difference between .edmx and .dbml file in linq?


By : Chris
Date : March 29 2020, 07:55 AM
I hope this helps . edmx is the modeling file for Entity Framework.
dbml is the modeling file for Linq 2 Sql.
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