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Monday, November 22, 2010

How to find usage of sql within the database

Have you ever was in that situation as I do from time to time ?

  • Remember the column or table in the database, but don't remember, where its exactly using and how ?
  • Trying to  remember all stored procedures, functions or triggers that uses  some text, not matter its sql word or some name?
  • Aasking yourself something like "A month ago, i wrote the procedure that has 'hallo world' text in it. What's the name of it?"

I'm falling in this situation quite often so decided to wrote something to make my life easier.
What I have now is small script that's actually kind of full-text search within database's programmability objects (procedures, function, triggers and so on).

Here is it:

declare @textToSearch varchar(max)
set @textToSearch = '%EmailLog%'

declare @total int;

with t (
    rownumber,
    name)
as
(
    select
    
    ROW_NUMBER() OVER (ORDER BY so.name) as rownumber,
        so.name 
    from
    
    syscomments sc 
        inner join sysobjects so on so.id = sc.id 
    where text like @textToSearch
)
select @total =count(*) from t

declare @currentPos int
set @currentPos = 1

declare @name varchar(max)

while (@currentPos <= @total) 

BEGIN 
    with t ( rownumber, name) as ( 
        select 
            ROW_NUMBER() OVER (ORDER BY so.name) as rownumber, 
            so.name 
        from
            syscomments sc 
            inner join sysobjects so on so.id = sc.id 
        where text like @textToSearch 
    ) 
    select @name = [name] from t where rownumber = @currentPos 
    Print '----------------------------------------------------------------------------------------------------' 
    Print @name Print '----------------------------------------------------------------------------------------------------' 
    EXEC sp_helptext @name; 
    Print '----------------------------------------------------------------------------------------------------' 
    set @currentPos = @currentPos + 1 
END 
go


Enter what are you looking for to the @textToSearch variable, between two '%' in example above.

In my example, i tried to find all places (stored procedures, functions, triggers and so on) that has text 'EmailLog'

To make result more readable, switch output view from Grid to Text. Use Ctrl+T or menu Query -> Results To -> Results To Text.

Just run it and  after a ninebt you will have text of each procedure or function that contains specified word

Thursday, November 18, 2010

Maximum length of Excel worksheet name can't be more then 31 characters

Today I was faced with very weird issue.
In our programm we are generating Excel reports.
There are many page in it. 
Each of the page is describing its own location.
Location names are storing in the database and putting to the Excel document as the name of the sheet.

Today, people started  complaint that they can't open the file.
During opening, Excel show very strange exception about incorrect format of the file:


The content of the log file told me, that the content of the file is wrong, but did not tell me where exactly is the issue. So, i had to start searching  it by myself.
I found that nothing has changed in the database except of  few new locations were added.
After comparing that locations with other that was added earlier, we found, that few of them are very long.

I had to cut the name of the location to 31 characters to solve the issue.



If you editing Excel file manually, Excel does not let you to type more then 31 characters in the name of the sheet. But, if you creating document dynamically, as we do with some .NET component, its easy to avoid this limitation and enter any length you want.

So, even in Microsoft Office 10, the name of the Excel sheet has so huge limitation.