Nov 22 2015

Importing Excel/CSV to SQL Server -- OpenDataSource

Category: Features | SQL ServerAdministrator @ 07:49

 

While there are many approaches which come and go for importing Excel and CSV data files into SQL Server nothing is as easy as using OpenDataSource.  I know there are many who use SSIS and its brethren but some things when dealing Excel combined with SSIS, like nvarchar, costs time and diminishes its ease of use.  So let's have a quick go of importing data, which I do on a local version of SQL running on my workstation.

Here's what my sample data looks like in Excel:

EmailAddress FirstName LastName
scottg@contoso.com Scott Guthrie
steves@contoso.com Steve Sanderson
aarons@contoso.com Aaron Skonnard
fritzo@contoso.com Fritz Onion
johns@contoso.com John Smith
scotth@contoso.com Scott Hunter
madsk@contoso.com Mads Kristensen
howardd@contoso.com Howard Dierking
elijahm@contoso.com Elijah Manor
estebang@contoso.com Esteban Garcia
shawnw@contoso.com Shawn Wildermuth
peteb@contoso.com Pete Brown
reisenberg@contoso.com Rob Eisenberg
timh@contoso.com Tim Heuer

 

So open a query window in SSMS and fire off the following query:

SELECT distinct * --[First Name], [Last Name], [EmailAddress]
FROM OPENDATASOURCE('Microsoft.Jet.OLEDB.4.0',
'Data Source=C:\MSSQL\clients\INTLdist\Queries\LoadEandF\SampleEmailList.xls;Extended Properties=Excel 8.0')...[Sheet1$]
where [FirstName] is not null

You'll see I'm using the provider for Excel's (97-2003) older version that are still in xls binary format. Also note the location of the Data Source which is local to the SQL Server you are running.

While you'll see that this as a rather simplistic sample, imagine an Excel file with 20 or greater columns and you'll begin to appreciate the ability to see column names and the ability to get right to the data without having to use some wizard to move "from/to" a destination.

So you might begin to think of things you could use this for.

Say someone lands a huge (>10GB) text file (SampleHugeFile.csv) on your network and you have to take a look inside to see what was delivered.  You're not going to use notepad or any other desktop client tool since most will eat your memory alive.  Instead just use the following and you'll see what's in the file without incurring the memory penalty:

SELECT  top 10 WorkRef, WorkKey
FROM OPENDATASOURCE('Microsoft.Jet.OLEDB.4.0',
'Data Source=C:\MSSQL\clients\INTLdist\Queries\LoadEandF\;Extended Properties="Text;HDR=YES"')...SampleHugeList#csv

I know some may see this as extreme but if you only have a hammer then everything starts to look like a nail.

Now for the final piece, since most of the world is using later versions of Excel you'll need slightly different OPENDATASOURCE provider notation:

select top 10 *
FROM OPENDATASOURCE('Microsoft.ACE.OLEDB.12.0',
'Data Source=C:\MSSQL\clients\INTLdist\Queries\LoadEandF\SampleEmailListInLaterVersion.xlsx;Extended Properties=Excel 12.0')...[Sheet1$]

 Note the change in providers when using the OPENDATASOURCE since you'll need to switch to this when using newer versions of Excel which support the xlsx file format.

Now start to mix it up and start using a CTE to manipulate the data like so:

;with CTE as 
(
SELECT distinct * --[First Name], [Last Name], [EmailAddress]
FROM OPENDATASOURCE('Microsoft.Jet.OLEDB.4.0',
'Data Source=C:\MSSQL\clients\INTLdist\Queries\LoadEandF\SampleEmailList.xls;Extended Properties=Excel 8.0')...[Sheet1$]
where [FirstName] is not null

)
	SELECT  
	   PARSENAME(REPLACE(EmailAddress,'@','.'),3) Email, 
       PARSENAME(REPLACE(EmailAddress,'@','.'),2) Domain, 
       PARSENAME(REPLACE(EmailAddress,'@','.'),1) DomainExt 
FROM CTE
 

results in:

Email Domain DomainExt
Anderson769 contoso com
Hayes231 contoso com
Russell637 contoso com
Simmons791 contoso com
Young91 contoso com
aarons contoso com
Gonzales286 contoso com

 

 SQL Server has many hidden gems that you need to see just once and then you'll understand how it can increase your productivity.



Tags: , ,

Feb 19 2013

SQL Server Async Stored Procedures

Category: SQL Server | Stored ProcedureAdministrator @ 08:05

As the saying goes: It's always better to be late than never and that goes double for this technique for executing stored procedures. 

What I'm referring to is a post from Remus Rusan, who explains in detail how to be able to run stored procedures in an asynchronous fashion:

http://rusanu.com/2009/08/18/passing-parameters-to-a-background-procedure/

In the set of two articles, he explains how to take a stored procedure, even with parameters, and run it without holding a client connection.

This is extremely useful if you need the ability for users to run long running procedures. 

You may be asking yourself why not just create a SQL Agent job and run that from the a client which has the same effect since SQL Agent jobs run asynchronously.  Well that's true but this technique is more flexible since you can pass parameters from the client whereas in the SQL Agent jobs there is no facility for passing parameters directly to the job.

He includes a detailed script for installing his helper stored procedures and the procedure for handling the Service Broker.  Yes I said Service Broker.

Don't get overly concerned since to use the SQL Service Broker is quite easy in setup and operational usage.

I won't go into his solution since you've probably already read that but what I offer here is just some small modifications which make it a little bit nicer to use.

To get started all you need is to have the Service Broker enabled by the DBA:

ALTER DATABASE xxxxxx SET SINGLE_USER WITH ROLLBACK IMMEDIATE;
ALTER DATABASE xxxxxx SET ENABLE_BROKER;
ALTER DATABASE xxxxxx SET MULTI_USER;

 

Once this is done you're good to install all the Stored Procedures from Remus.

Check the DBA:

SELECT is_broker from sys.databases where name = 'xxxxxx';

 

One of the modification I made to the set of procedures was to be able to see the Start_Time of the running Stored Procedure.

In Remus's routines, all execution is within a Transaction which proves invaluable since you'll need the rollback capability in the case of failure.

But the Start_Time I don't think qualifies as a need for the rollback of the transaction plus I want to display the Start_Time to the users who requested the run of the procedure.

So all I did was include an execution of a CLR procedure to update the Start_Time.  Since CLR procedures execute outside the transaction it updates the Start_time immediately.

I made the change here in the AsyncExecActivated procedure:

 

begin try;
    receive top (1).......

if (@messageTypeName = N'DEFAULT'....

--CLR procedure
EXECUTE ExecuteSQLNoQuery

 

I also included a way to cancel a waiting procedure which is next in line to be handled by Service Broker execution.

It's crude but it allows you to stack up requests and act on the behalf of the user to cancel inadvertent requests.

Just update the error_message with anything (before it runs) for that task and it will effectively be cancelled.

select @error_message = error_message from dbo.tblTaskResults
      where [token] = @token;

--see if the request was canceled
if (@messageTypeName = N'Default' and @error_message is null)

 

I've put together an ASP.NET Page which allows users to initiate and cancel queued requests:

 

I've included my script for those who would like to build onto my recipe for Asynchronous Procedure Execution:

http://sdrv.ms/12r1d7C

I drive my whole web page and the Tasks available for execution based solely upon a SQL configuration table.

This technique frees the developer to add new tasks at anytime and no longer do you need to add more SQL Agent jobs.

Developers need time to drive into subject matter.  Heads down developing is a trap.

Tags: , , ,