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bfuchsFlag for United States of America

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How to perform an update query from a UDF that receives parameters from multiple tables?

Hi Experts,

I have a table called Employeestbl

I would like to perform an update to a field of this table to all records that a UDF called EmployeesMissingDocs returns '1'.

Now my main issue is that this UDF expects values as parameters from different tables.

See example below

FUNCTION [dbo].[EmployeesMissingDocs] (
@EmployeeID int,
@Title varchar(50) = null,
@LicenseNumSignedYN bit = null,
@LicenseExpires DATETIME= null,
@BclsExpires DATETIME= null 
) RETURNS VARCHAR(2000)

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Where EmployeeID and Title come from Employeestbl, License info come from a second table and Bcls from a third one..

How can I perform this in a single update statement?
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PortletPaul
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Use a CTE, contruct a query that uses the neede tables and returns the wanted rows. Then update the tsble using that CTE.
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Sharath S
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The UDF really doesn't care where the parameters come from.  It's up to the calling operation to pass the correct parameter(s).

Can you clarify what you're trying to do?
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ASKER

Hi Experts,

First thanks for replying..

Perhaps you can help me apply your suggestions given the details below:

A- the table/field I'm looking to update is EmployeesJcahoInfo.EmployeeID

(So in other words the SQL statement should be something like "Update EmployeesJcahoInfo.EmployeeID set MyField = False where EmployeesMissingDocs (Param1,Param2,Param3..) = '1')

B- the query joins needed for the UDF parameters are as follows

           
dbo.CoreMandatory RIGHT OUTER JOIN
                         dbo.Employeestbl ON dbo.CoreMandatory.EmployeeID = dbo.Employeestbl.ID LEFT OUTER JOIN
                         dbo.Facilitiestbl LEFT OUTER JOIN
                         dbo.FacilitiesDocumentsRequirements ON dbo.Facilitiestbl.ID = dbo.FacilitiesDocumentsRequirements.FacilityID RIGHT OUTER JOIN
                         dbo.TovInfo ON dbo.Facilitiestbl.Tov_ID1 = dbo.TovInfo.TovCode ON dbo.Employeestbl.ID = dbo.TovInfo.EmployeeID 

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C- the list of parameters is quite long (I just listed in OQ the first few), I guess you dont need them, will figure this out already once I have an example.

D- let me know if you need more info.

Thanks,
Ben
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ASKER

@KDO,
The UDF really doesn't care where the parameters come from.
Well if they would all come from one table (let say EmployeesJcahoInfo), I would have no problem executing it like this
Update EmployeesJcahoInfo.EmployeeID set MyField = False where EmployeesMissingDocs (EmployeesJcahoInfo.Field1,EmployeesJcahoInfo.Field2,EmployeesJcahoInfo.Field3..) = '1')

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The whole issue is how to get those parameters supplied, and if I try to do this on a joined sql results then it becomes non updatable.

Thanks,
Ben
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@Kdo,
write the update statement without relying on the UDF......WHERE
    condition(s)
Not sure what you mean by that, as the where condition is the point I need to use the UDF for?
SQL Server allows you to join tables in an UPDATE statement
Are you saying I can have all those outer joins shown above (ID: 41738208) embedded in this update statement?
Thanks,
Ben
Did you look into my post?
>> Are you saying I can have all those outer joins shown above (ID: 41738208) embedded in this update statement?

Sure.  All modern database engines support SQL that allows you to join values in a sub-query, though vendors generally don't agree on the correct form so the statements don't always work across platforms without some changes.

Sharath posted an example earlier, too.

Kent
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ASKER

@Sharath, @Kdo,

Testing it, will let you know..

Thanks,
Ben
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ASKER

Worked, thank you guys!