Comparing Recordsets

Posted on 2004-09-29
Last Modified: 2013-12-25
I want to compare the last two rows in a table and im trying to do this by creating two recordsets containing the same data. Is there a better way to do this? And is there a way to compare the recordsets as a whole instead of comparing the fields in the recordsets eg if Recordset1 = Recordset2. Thanks
Question by:oagunbiade
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Accepted Solution

SQL_Stu earned 125 total points
ID: 12178616
You could use Recordset.Clone to mirror your original recordset.

Perhaps you could join all the fields together into 1 string and then compare the whole record against the clone?
LVL 53

Expert Comment

ID: 12179197
What exactly do you need to know ?
Do you want to know if there are more records in one table (or recordset) than in the other ?
Or do you want to compare at field level to see if the data is exactly the same ?

Author Comment

ID: 12179251
Yes i want to compare 3 fields to see if they are exactly the same as the previous rows 3 fields.
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Expert Comment

ID: 12185673
What database are you using. You could write an SQL statement to do this for you then just fit it into a function call in your code. Tell me what database.

Expert Comment

ID: 12188442
You can use a single ADO recordset  to do this
kount = 0  '' your row count
str1= "select f1,f2,f3 from yourdb" str1,cn,adopenkeyset  'Where cn is your ado connection
if rs.eof = false then
appstring_next= rs(0) & rs(1) & rs(2)
appstring_prev = "" 
end if
while rs.eof = false
  kount = kount + 1
  if appstring_prev = appstring_next then
     msgbox kount  & " and " & kount -1 & " rows are similar " 
 end if
appstring_prev = appstring_next
appstring_next= rs(0) & rs(1) & rs(2)

Infact this code will find out any two adjacent rows having two fields as similar ....



LVL 18

Expert Comment

ID: 12211320
I agree with Arundel_Castle you should do this with an sql statement. something like below. Not that both tables in the from statement are the same table with different aliases.
If the result is 0 (zero) then the last 3 fields don't match.

select count (*)
from Table1 as A, table1 as B
where A.fieldPK = 'XYZ'
   and B.fieldPK = 'XYY'
   and A.field1 = B.field1    
   and A.field2 = B.field2    
   and A.field3 = B.field3    

Expert Comment

ID: 12235754
oagunbiade, did you say you want to compare the LAST two rows? If so then you can do it in fewer steps using one recordset
Dim Match as Boolean
Dim LastRow as String
Dim PrevRow As String

With rs   'your recordset
      LastRow= Cstr(.Fields(0)) & " " & Cstr(.Fields(1)) & " " & Cstr(.Fields(2))   'concatenates the values in the first 3 fields and assigns it to a string variable
      PrevRow =Cstr(.Fields(0)) & " " & Cstr(.Fields(1)) & " " & Cstr(.Fields(2))   'concatenates the values in the first 3 fields and assigns it to a string variable
End With

Match=( Instr(1,LastRow,PrevRow)>0)

Expert Comment

ID: 12235763
Of course before the code I submited you should select all the records in the table(either by using the ado control at design time or using the sql select statement,which I prefer)


Author Comment

ID: 12246952
Thanks everyone for your contribution but the clone method seems to work perfectly.

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