In one of the applications that I'm working on I have 2 sets of
functions that build different datasets.
Imagine 4 columns in a datagrid. Inside those 4 columns I have nested
datalists. Two of the datalists' datasources point to database A and
the other two point to database B. This effect allows the client to
perform a side-by-side comparison of the same product so that records
can be updated accordingly. It's easy enough to scroll down and look
for differences but I was asked to make it even easier for the client.
The ultimate goal is to have any changes displayed in red or bold type
so that differences can be spotted at first glance. An example would be
that if Database A has product XYZ's latest version at 3 and Database B
has product XYZ's latest version at 4, then the 4 would be displayed in
red or bold type.
I'm thinking that a cookie might be the way to go but I could be wrong.
Does anyone have any suggestions or references that I can check out to
compare datasets row-by-row? Is there an easier way to go about doing
this?
Nov 19 '05
19  2984 
I read some related articles very thoroughly and have at least a
general understanding of how to create the datatable. I have about 8
functions that are tied to my datalists that retrieve data. Each
function has different SQL statements that retrieve specific pieces of
data. What would be the best way of "concatenat ing" onto my current
datatable? If I dim a new datatable in each function won't the
information keep getting rewritten? I haven't found any literature
online in regards to this matter. Everything I've come across
presupposes that there is one subroutine with 2 or more datasets.
You can add as many datatables to a dataset as you'd like to. You just have
to make certain that each datatable has a different name.
For example (Assuming you already have a dataset that contains one or more
datatables) you may add another like so:
Public Function AddTableToDataS et(ByVal dataSetToAddTo As DataSet, ByVal
sqlCommand As SqlCommand, ByVal dataSetTableNam e As String) As DataSet
Try
Dim FortunateDataAd apter As SqlDataAdapter =
GetDataAdapter( sqlCommand)
FortunateDataAd apter.Fill(data SetToAddTo, dataSetTableNam e)
Return dataSetToAddTo
Catch e As Exception
Throw e
End Try
End Function
Sincerely,
--
Sincerely,
S. Justin Gengo, MCP
Web Developer / Programmer www.aboutfortunate.com
"Out of chaos comes order."
Nietzsche
"Will Lastname" <wh****@brinkst er.net> wrote in message
news:11******** **************@ f14g2000cwb.goo glegroups.com.. . I read some related articles very thoroughly and have at least a
general understanding of how to create the datatable. I have about 8
functions that are tied to my datalists that retrieve data. Each
function has different SQL statements that retrieve specific pieces of
data. What would be the best way of "concatenat ing" onto my current
datatable? If I dim a new datatable in each function won't the
information keep getting rewritten? I haven't found any literature
online in regards to this matter. Everything I've come across
presupposes that there is one subroutine with 2 or more datasets.
So to test this I created a dataset with 2 tables. Let's just say
Table1 and Table2. In going through my FOR Next Loop I tried the
following:
For i = 0 To dsRowCount - 1
If ds.Tables("Tabl e1").Rows(i)("C olumnName") <>
ds.Tables("Tabl e2").Rows(i)("C olumnName") Then
response.write( "not the same")
Else
resposne.write( "ok")
End If
Next i
I am getting an "Object reference not set to an instance of an object."
error when I attempt this. Any suggestions or pointers?
I filled one of the datasets in Function A and the other in Function B
and returned them. Am I not able to access them this way?
Will,
Running in debug mode, does your for next loop error out right away, or make
it through at least one iteration first?
I'm wondering if your tables have the same number of columns in them. If
they don't...
--
Sincerely,
S. Justin Gengo, MCP
Web Developer / Programmer www.aboutfortunate.com
"Out of chaos comes order."
Nietzsche
"Will Lastname" <wh****@brinkst er.net> wrote in message
news:11******** **************@ g47g2000cwa.goo glegroups.com.. . So to test this I created a dataset with 2 tables. Let's just say
Table1 and Table2. In going through my FOR Next Loop I tried the
following:
For i = 0 To dsRowCount - 1
If ds.Tables("Tabl e1").Rows(i)("C olumnName") <>
ds.Tables("Tabl e2").Rows(i)("C olumnName") Then
response.write( "not the same")
Else
resposne.write( "ok")
End If
Next i
I am getting an "Object reference not set to an instance of an object."
error when I attempt this. Any suggestions or pointers?
It errors even if I try:
response.write( ds.Tables("Tabl e").Rows(0)("Co lumnName"))
I'm getting so frustrated with this.
Thanks for helping out!
Well, then it's not finding any columns at all for that table.
Try this code (it uses index numbers for the table, rows, columns so that if
the problem is the wrong table name you'll know):
'---Start by making certain that the dataset actually contains at least the
one table.
If ds.Tables(0) Is Nothing Then
Response.Write( "Table Not Found!" & "<br>")
Else
'---Check if any rows exist
If ds.Tables(0).Ro ws.Count > 0 Then
Response.Write( ds.Tables(0).Ro ws.Count.ToStri ng & "<br>")
Response.Write( ds.Tables(0).Ro ws(0).Columns(0 ).ColumnName)
Else
Response.Write( "No Rows Found!")
End If
End If
--
Sincerely,
S. Justin Gengo, MCP
Web Developer / Programmer www.aboutfortunate.com
"Out of chaos comes order."
Nietzsche
"Will Lastname" <wh****@brinkst er.net> wrote in message
news:11******** **************@ z14g2000cwz.goo glegroups.com.. . It errors even if I try:
response.write( ds.Tables("Tabl e").Rows(0)("Co lumnName"))
I'm getting so frustrated with this.
Thanks for helping out!
This writes the name of the column name in the function where I fill
the dataset. If I try to compare a dataset in another function to this
dataset then I get an error.
Will,
I didn't realize you were declaring the dataset object inside of one
function and then using it again in another...
Objects declared within a function are only available within that function.
Instead declare your dataset object as a dataset outside of the first
function near the top of the page but inside of the class.
Private ds As DataSet
Then fill the dataset inside of your first function.
Private Function Number1()
'---Fill ds here
End Function
You won't have to declare ds inside of the function it's available
throughout the whole class.
Now it won't be nothing in the second function.
--
Sincerely,
S. Justin Gengo, MCP
Web Developer / Programmer www.aboutfortunate.com
"Out of chaos comes order."
Nietzsche
"Will Lastname" <wh****@brinkst er.net> wrote in message
news:11******** **************@ o13g2000cwo.goo glegroups.com.. . This writes the name of the column name in the function where I fill
the dataset. If I try to compare a dataset in another function to this
dataset then I get an error.
Object reference not set to an instance of an object
Still getting this. I'm going to have to bag this idea for now.
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