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Calling SQL Server Stored Procedures using DAO

Posted on 1998-08-06
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I'm trying to call a stored procedure using DAO on a SQL server.  I've seen and tried examples for RDO but i don't know what that is and i can't get it to work either.

I have no problems sending queries using OpenRecordset and getting the results that way, so i know i'm connecting properly.

I need a detailed description of how to connect to a SQL server database, call a stored procedure and have it return results to me.  i also need to be able to send data to the stored procedure that updates records and doesnt return results.  and even more if the stored procedure is made to send an error message if something happens i need it to be able to send that back to me rather then the 'ODBC -- connection failed' error.

thanx!
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Question by:b0b080698
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by:peterwest
ID: 1468198
Hi there,

You say that standard queries work ok?  Well, rather than going through all the routine of explaining how to connect i'll try to give you some ideas as to why your stored procedures aren't working - if you're still having problems after checking these things then i'll be only too happy to explain connection issues, including RDO if necessary.

You can call a stored procedure in exactly the same way as you'd execute a normal query - for example, if you had a stored procedures called MyQuery you would simply do the following:

             Set MyData = db.OpenRecordset("MyQuery",dbOpenSnapShot,dbSQLPassThrough)

The above line will return a read-only recordset although you could change it to a read/write data set by simply using dbOpenDynaSet instead of dbOpenSnapShot.  We ALWAYS use dbSQLPassThrough at the place where I work when executing any queries on SQL Server.

Finally you'll need to make sure you've got priviledges to execute the stored procedure.  These rights will need allocating to the username you use to access the database tables.

Hope this gives you some ideas, let me know if you want to know anything else - i'm quite new to SQL Server myself but my colleague is something of an expert on it....

Pete
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by:b0b080698
ID: 1468199
thanx.  that seems to have worked.  but i need a little more power then just retreiving record sets.  how do i make it so that i can send values to the the stored procedure?  how can i make it so that if the stored procedure dies i get the stored procedure error rather then just the 'ODBC -- connection failed error.'?

i think i'll ammend my question up top.
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by:b0b080698
ID: 1468200
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by:b0b080698
ID: 1468201
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peterwest earned 150 total points
ID: 1468202
Hi again,

Right then - the first issue - how to pass parameters to the stored procedure!!

Just do the following:

      CREATE PROCEDURE [ProcedureName] @MyParam varchar(20) AS
      SELECT * FROM MYTABLE WHERE MYFIELD = @MyParam

The above example accepts a string parameter of a maximum of 20 characters in length - you'd execute this procedure as described before but simply add the string parameter in quotes after the procedure name.  You can add further parameters by simply putting a comma after the first param and then specifying the next param name and data type.

Don't forget that you'll need to reassign rights for the procedure once you've recreated it - I usually use the command:

        GRANT EXECUTE ON [ProcedureName] TO [UserName]

On the issue of error reporting from stored procedures; well, depending on what version of VB you are using there are a number of ways you can determine if a stored procedure has failed and if so why....

Both VB4 and 5 produce a collection of errors when a DAO error occurs.  To allocate the description of one of the errors to a variable you can just do the following:

         MyError = Errors(0).Description

And simply increase the index by 1 to view all the different errors, typically the last error is the one displayed by VB and also the least informative.  I tested this method with a stored procedure and it did indeed return the error that I expected.

Anyway, I hope that is of help to you - anything else you want to know then just let me know.

Pete

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by:b0b080698
ID: 1468203
thanx.

i got the error thing figured out.  i wrote a stored procedure that purpously produced an error.  i didnt have an error handler so the only thing i ever got was 'ODBC -- connection failed' which isnt really what happend because the connection worked fine.  it executed the procedure got the error and kicked out.  oh well.  i think i'll be fine from here.  thanx!  :P
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by:peterwest
ID: 1468204
No problem - if you've got any further problems that you can always drop me a line (peterjwest@yahoo.com)

Cheers

Pete
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