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SQL Type Conversion

Posted on 2013-01-06
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Last Modified: 2013-01-24
I have modified the code to find text in tables to what you see below.

SET @sql_string = 'IF EXISTS (SELECT * FROM ' + @table_name + ' WHERE ' + @column_name + ' LIKE ''%' + @search_string + '%'') PRINT ''select * from ' + @table_name + ' where ' + @column_name + ' like ''%' + @search_string  + '%''' + ''''

I am getting this error message on the second occurence of @search_string.

Conversion failed when converting the varchar value 'select * from IV30500 where DOCNUMBR like ' to data type int.

I believe what is happening is that often the value can be all numeric so SQL converts it to a numeric type field as opposed to just treating it as all text. How do I adjust this portion to simply treat whatever is read as text? Do I need to put a case statement that looks for all digits and then converts to string while leaving any values that do have characters alone? If so, what would the syntax look like?
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Question by:rwheeler23
12 Comments
 
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Expert Comment

by:Om Prakash
ID: 38749786
SET @sql_string = 'IF EXISTS (SELECT * FROM ' + @table_name + ' WHERE ' + @column_name + ' LIKE ''%' + @search_string + '%'') PRINT ''select * from ' + @table_name + ' where ' + @column_name + ' like ''%' + @search_string  + '%''' + ''''

Most probably you should not get errors if all the variables used above are declared as varchar.  if there is a numeric field, you can convert as
CAST(@search_string AS VARCHAR(200))
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Expert Comment

by:Pratima Pharande
ID: 38749849
I think error is not for the search string
it is for sql_string


Conversion failed when converting the varchar value 'select * from IV30500 where DOCNUMBR like ' to data type int.

as it is saying failed to convert whole sql that is created to int

can share complete code with us
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LVL 12

Expert Comment

by:Saurabh Bhadauria
ID: 38749982
Please post your complete code...
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Author Comment

by:rwheeler23
ID: 38750752
It is the execute SQL that actuall fails. Here is the complete code. All I Am trying to do is to get thise code to produce the actual select statements I need to look for data in tables. So the end result may be lines that read

select * from MyTable where MyColumn='123456' or
select * from MyTable where MyColumn='abcdef'
FindTextInTables.txt
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LVL 12

Expert Comment

by:Saurabh Bhadauria
ID: 38751064
I guess you are looking for script to search particular value  in whole DB...
I have developed my own code....which will perform better then cursor.. have a look and let me know if you have nay concern...

declare @search_string nvarchar(200),@sql nvarchar(max) ,@object_id bigint

set nocount on 

set @search_string='Kentucky'

Create table #temp_t
( object_id bigint default 0,
	query nvarchar(max)
 )

insert into #temp_t (object_id,query)
select s.OBJECT_ID, 'if exists ( select 1 from ' +  object_name(s.object_id) + ' where '  + s.name + ' like  ''%' + @search_string +'%'' )  '+ Char(13) + 
        'Print  ''select * from ' +  object_name(s.object_id) + ' where ' + s.name + ' like  ''''%' + @search_string + '%'''''';' 
 from sys.columns s  join  sys.objects o on s.object_id=o.object_id where o.type='U'


While @@ROWCOUNT > 0
begin
set @sql=''
set @object_id = (select top(1)  t.object_id from #temp_t t )
if @@ROWCOUNT=0
break;

select @sql= @sql + Case when @sql > '' then CHAR(13) else '' end + query from #temp_t t where t.object_id=@object_id
--print @sql
exec (@sql)

Delete from #temp_t  where object_id=@object_id 
end 



drop table #temp_t

Open in new window


Thanks,
saurabh
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Author Comment

by:rwheeler23
ID: 38751283
In addition to looking for text in tables I then want to build the SQL select statements so I can actually seen the data records in each table that it is found. I have a database with 1,500 tables and those tables have relationships. I am just looking for something to build those select statements to aid in the data discovery process.

I will attempt to modify your code later today.
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LVL 12

Expert Comment

by:Saurabh Bhadauria
ID: 38751647
Sure ...let me know if you need any help
0
 
LVL 69

Expert Comment

by:Scott Pletcher
ID: 38751733
That code is hideously inefficient.

The code should be written such that:

1) it does not check impossible columns
2) it checks all columns for one table at the same time
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Author Comment

by:rwheeler23
ID: 38751914
Just for the record, when I ran the original script it took about 30 minutes hour on an 18GB database. I currently have the revised verison running and it has been over 1 1/4 hours. I appreciate the help. I keep getting asked to do this so I am trying to save myself time by having the Select statement created by the search. Can my original script be corrected so the Execute statement will execute correclty?
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LVL 12

Accepted Solution

by:
Saurabh Bhadauria earned 500 total points
ID: 38753785
I forget to add  system_type_id filter in where clause. in below query..

insert into #temp_t (object_id,query)
select s.OBJECT_ID, 'if exists ( select 1 from ' +  object_name(s.object_id) + ' where '  + s.name + ' like  ''%' + @search_string +'%'' )  '+ Char(13) +
        'Print  ''select * from ' +  object_name(s.object_id) + ' where ' + s.name + ' like  ''''%' + @search_string + '%'''''';'
 from sys.columns s  join  sys.objects o on s.object_id=o.object_id where o.type='U' and s.system_type_id IN (167, 175, 231, 239)

By the way... I have modified your code.. you have missed some quotes....other wise it is fine..

Both codes are attached..you are free to choose any one....
I have made some changes in my script...it should work fine now...

Thanks,
Saurv
your.sql
my.sql
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Author Comment

by:rwheeler23
ID: 38754300
Thank you. I will give these a try later today and let you know.
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Author Closing Comment

by:rwheeler23
ID: 38817313
Thank you. I forgot this was not awarded
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