Tracking Forums, Newsgroups, Maling Lists
Home Scripts Tutorials Tracker Forums
 
  HOME    TRACKER    Visual Basic




AdOpenDynamic, AdLockOptimistic


i have had problems with my ADO code, and have been instructed by members of XVBT to put these commands in my code:

adOpenDynamic, adLockOptimistic

i would like to know where i can find a tutorial on how these work and when to use them because i dont fully understand their meaning and purpose.
Can someone supply me with a link please.

thanks alot
sam




View Complete Forum Thread with Replies

See Related Forum Messages: Follow the Links Below to View Complete Thread
AdLockOptimistic
public rs as recordset

Opening recordset using adLockOptimistic

I can update pressing rs.update from the same child form.
but from

mdi1.activeform.rs.update

does nothing.

What should I do to update record from mdi form and the lock type should be adLockOptimistic.

AdLockOptimistic???
I have a small application that browses the tables of a SQL databases. I have a combo box that lists all the tables, and then based upon the selection, a data grid is populated.

Here is the problem.

I created a new database and a new table with a few new fields. When I try to browse this database, I get an error: "The rowset is not bookmarkable." With some tinkering, I got it to work by removing the adLockOptimistic from my open command:
RS.Open strSQL, conSQL, adOpenStatic, adLockOptimistic.

What will this do? Where can I get a reference for all of these "ad" flags so that I can stop bothering all of you?

Thanks in advance for the help!

Code Confusion : What Does Adlockoptimistic = 3 Mean?
i have this line of code causing problems in my script:

rsrows.Open strSQL, strCn, adOpenDynamic, adLockOptimistic

and gave this explanation:

adlockOptimistic = 3

for this error msg:

the connection cannot be used to perform this operation. it is either closed or invalid in this context

does anyone know why vb would give ( adlockOptimistic = 3 ) as an explanation... why would it have to = 3.


thanks guys

xx

AdOpenStatic Vs AdOpenDynamic
ok, If I'm reading this right, adOpenStatic means you get a copy of whatever is in the data right now. If you keep this copy for 30 minutes without refresh, what you have might easily not be what is in the source table.

adOpenDynamic allows you to see additions and changes as they are completed by other uses.

What is the time hit (in human sense) of using static vs dynamic. Obviously this will depend in great part on the network traffic, but generally speaking, will the end user be able to really see the difference in the data?

Adopendynamic Sqlserver View Changes
Does any one have a sample of a dbgrid bound to a adodc control that is bound to a ado dynamic recordset, that changes automatticlly the data when another user changes the data, or is there any simple way without refetching all the data, to show the changes only.

Thank you.

AdOpenStatic Vs AdOpenDynamic Vs AdOpenForwardOnly
Hi all,

I recently changed some of my code to use the Open nethod on the recordset rather than the Execute method on the connection.
I noticed that when I used the adOpenStatic cursor type, the result returned is incorrect as opposed to using adForwardOnly or adOpenDynamic.
Below is the code that I use.


Code:

sSQL = "SELECT Ord_Committed_Qty, Ord_Unit_Price "
sSQL = sSQL & "FROM Orders5 WHERE "
sSQL = sSQL & "Ord_Order_No = '" & p_OrderNo & "' "
sSQL = sSQL & "AND Ord_Rec_No BETWEEN '01' AND '99' "

Dim rs As New ADODB.Recordset

' Set rs = m_Connection.Execute(sSQL, , 1)

rs.Open sSQL, m_Connection, adOpenDynamic, adLockOptimistic


'dangerous cursor types --result is incorrect most of the time.
' rs.Open sSQL, m_Connection, adOpenStatic, adLockOptimistic
' rs.Open sSQL, m_Connection, adOpenKeyset, adLockOptimistic

Dim cItem As clsOrderItem

Do Until rs.EOF
Set cItem = New clsOrderItem
cItem.QtyCommitted = rs("Ord_Committed_Qty")
cItem.UnitPrice = IIf(rs("Ord_Unit_Price") <> 0, rs("Ord_Unit_Price"), 0.01)

gdTotalInvoiceAmount = gdTotalInvoiceAmount + IIf(rs("Ord_Unit_Price") <> 0, (cItem.UnitPrice * cItem.QtyCommitted), 0)
rs.MoveNext
Loop


In my example, record count is 9, during debugging record count shows 9 all the way through the loop, and it explodes to 272 on the last pass.
Does anyone know why?
It works well when using adOpenForwardOnly or adOpenDynamic, so I am not too worried. Should I though, sometimes speed is critical.

Can You Use AdOpenDynamic For A Client-side ADO Recordset
Hi all

I'm developing a multiuser application where users need to see everyone else's changes using ADO. Can you open a recordset as adOpenDynamic for a client-side recordset? I've tried to but as soon as I run the code and check the .CursorType property it says it's opened it as adOpenStatic, thus other users can't see additions/updates. I haven't actually found any documentation that says you cannot open them as client-side cursors so just want to check.

Cheers

Copyright 2005-08 www.BigResource.com, All rights reserved