Question

In a project I am currently working on, I need to access 2 databases in LINQ in the following manner:

1. I get a list of all trip numbers between a specified date range from DB1, and store this as a list of ‘long’ values

2. I perform an extensive query with a lot of joins on DB2, but only looking at trips that have their trip number included in the above list.

Problem is, the trip list from DB1 often returns over 2100 items – and I of course hit the 2100 parameter limit in SQL, which causes my second query to fail. I’ve been looking at ways around this, such as described here, but this has the effect of essentially changing my query to LINQ-to-Objects, which causes a lot of issues with my joins

Are there any other workarounds I can do?

Answer 1

as LINQ-to-SQL can call stored procs, you could

• have a stored proc that takes an array as a input then puts the values in a temp table to join on
• likewise by taking a string that the stored proc splits

Or upload all the values to a temp table yourself and join on that table.

However maybe you should rethink the problem:

• Sql server can be configured to allow query against tables in other databases (including oracle), if you are allowed this may be an option for you.
• Could you use some replication system to keep a table of trip numbers updated in DB2?