Tom Bolton
tom.bolton at donnslaw.co.uk
Mon Jan 31 04:14:24 CST 2005
Hi Mark
What does your SQL query look like?
Cheers,
Tom
-----Original Message-----
From: Mark A Matte [mailto:markamatte at hotmail.com]
Sent: 28 January 2005 17:41
To: accessd at databaseadvisors.com
Subject: RE: [AccessD] Data from Informix to Access - dirty reads?
Ok...I think I'm almost there. With a little tweaking I've made it to:
Debug.Print rsRecordset("myField1") 'etc...
Then I get this error:"Multiple-step OLE DB operation generated errors.
Check eash OLE DB status value, if available. No work was done."
Any suggestions?
Thanks,
Mark
>From: Tom Bolton <tom.bolton at donnslaw.co.uk>
>Reply-To: Access Developers discussion and problem
>solving<accessd at databaseadvisors.com>
>To: "'Access Developers discussion and problem
>solving'"<accessd at databaseadvisors.com>
>Subject: RE: [AccessD] Data from Informix to Access - dirty reads?
>Date: Fri, 28 Jan 2005 09:38:07 -0000
>
>Mark
>
>No probs, the following will retrieve data into an ADO recordset. Check
>the
>syntax first mind, as I'm just freestyling this into my email editor...
>
> Dim rsRecordset as ADODB.Recordset
> Dim cnConnection as ADODB.Connection
>
> Dim strConnectionString as String
> Dim strSQL as String
>
> ' instantiate data objects
> set rsRecordset = New ADODB.Recordset
> Set cnConnection = New ADODB.Connection
>
> ' connection string
> strConnectionString =
>"DSN=mydsn;UID=myUID;PWD=myPWD;DATABASE=myDB;HOST=myHost;SRVR=myServer;SERV
=
>myPortNumber;PRO=onsoctcp;"
>
> ' opne connection
> cnConnection.Open strConnectionString
>
> ' query
> strSQL = "SELECT blah blah FROM yadda yadda WHERE some things"
>
> ' pull records
> ' keyset cursor type is compatible with DAO
> rsRecordset.open strSQL, cnConnection, adOpenKeyset, adLockReadOnly
>
>
> ' loop through recordset
> Do While Not rsRecordset.EOF
>
> Debug.Print rsRecordset("myField1") 'etc...
>
> rsRecordset.MoveNext
>
> Loop
>
>
>This should get you started - remember, http://www.connectionstrings.com if
>you get stuck on the connection string. You'll need a reference set to MS
>ActiveX Data Objects.
>
>HTH
>Tom
>
>
>
>-----Original Message-----
>From: Mark A Matte [mailto:markamatte at hotmail.com]
>Sent: 27 January 2005 19:56
>To: accessd at databaseadvisors.com
>Subject: RE: [AccessD] Data from Informix to Access - dirty reads?
>
>Tom,
>
>">Mark - instead of using APPEND queries, would it not be any faster to
>pull
> >the data from Informix in an ADO recordset - I'm doing this via ODBC as
> >this
> >is how our Terminal Servers are set up >:¬( - then open a DAO recordset
>on
> >your Access table, and loop round in a do...while copying the records
>from
> >one to the other"
>
>I've never used ADO...can you send a sample of code?
>
>Thanks,
>
>Mark
>
>
> >From: Tom Bolton <tom.bolton at donnslaw.co.uk>
> >Reply-To: Access Developers discussion and problem
> >solving<accessd at databaseadvisors.com>
> >To: "'Access Developers discussion and problem
> >solving'"<accessd at databaseadvisors.com>
> >Subject: RE: [AccessD] Data from Informix to Access - dirty reads?
> >Date: Thu, 27 Jan 2005 10:57:05 -0000
> >
> >Mark (and Jim)
> >
> >Sorry for the delay, had a bit on yesterday. There are indeed ADO/OLEDB
> >drivers for Informix, a colleague has installed one but is having a
>little
> >difficulty with the connection string. Try
> >http://www.connectionstrings.com
> >
> >
> >Mark - instead of using APPEND queries, would it not be any faster to
>pull
> >the data from Informix in an ADO recordset - I'm doing this via ODBC as
> >this
> >is how our Terminal Servers are set up >:¬( - then open a DAO recordset
>on
> >your Access table, and loop round in a do...while copying the records
>from
> >one to the other? Jim has an excellent link explicitly explaining how to
> >do
> >just this. However, I've a sneaking suspicion that he's right, and ODBC
>is
> >at the bottom of your woes - definitely worth exploring OLEDB, as
>methinks
> >ODBC is a little old-hat these days.
> >
> >It might just be me (ASP/Oracle/SQL Server background) but I like to try
> >and
> >avoid letting Jet anywhere near anything that's not solely concerned with
> >Access FE tables (for which, of course, it's excellent).
> >
> >Cheers
> >Tom
> >
> >
> >-----Original Message-----
> >From: Jim Lawrence [mailto:accessd at shaw.ca]
> >Sent: 27 January 2005 04:48
> >To: 'Access Developers discussion and problem solving'
> >Subject: RE: [AccessD] Data from Informix to Access - dirty reads?
> >
> >Hi Mark:
> >
> >Your bottle-neck is ODBC. The only way around that is if there is a
>direct
> >ADO-OLE equivalent. I am sure there are ADO drivers for every version of
> >Informix...check these out:
> >
>
>http://www.gold-software.com/LuxenadbExpressdriverforInformixPro-review9342
>.
> >htm (ADO type driver... shareware.
> >
> >You can download the driver from IBM at:
> >http://www.ibm.com/products/finder/us/en/finders?pg=ddfinder
> >
> >To then use it the code is something like this:
> >
> >Dim objConn As ADODB.Connection
> >Dim gsConnectionString as String
> >
> >gsConnectionString = "Provider=Ifxoledbc;Password=pass; Persist Security
> >Info=True;User ID=user;Data Source=market_report;"
> >
> >objConn.connectionstring = gsConnectionString
> >objConn.Open
> >
> >HTH
> >Jim
> >
> >
> >-----Original Message-----
> >From: accessd-bounces at databaseadvisors.com
> >[mailto:accessd-bounces at databaseadvisors.com] On Behalf Of Mark A Matte
> >Sent: Tuesday, January 25, 2005 6:49 AM
> >To: accessd at databaseadvisors.com
> >Subject: RE: [AccessD] Data from Informix to Access - dirty reads?
> >
> >Hello All,
> >
> >Every week I do pulls from Informix to A97 using ODBC. 1 of my pulls now
> >is
> >
> >around 1 million records. I use temp tables and append queries. This
>can
> >take a few hours. Some of the replies in this thread imply there is a
>much
> >'better/faster' way. Without changing versions of Access...is there a
>way
> >to 'tweak'/'speed up' this data pull?
> >
> >Thanks,
> >
> >Mark
> >
> > >From: Roz Clarke <roz.clarke at donnslaw.co.uk>
> > >Reply-To: Access Developers discussion and problem
> > >solving<accessd at databaseadvisors.com>
> > >To: "'Access Developers discussion and problem
> > >solving'"<accessd at databaseadvisors.com>
> > >Subject: RE: [AccessD] Data from Informix to Access - dirty reads?
> > >Date: Tue, 25 Jan 2005 09:52:19 -0000
> > >
> > >Informix doesn't support XML afaik ><
> > >
> > >We did think about this as a way around connection issues for SQL
>Server
> > >when we thought that we would have our main db replicating to SQL
>Server
> > >rather than Informix - our recordsets are going to be up to about 50k
> >rows
> > >I
> > >think. I don't know how XML would perform with that volume of data but
> >it's
> > >academic for now.
> > >
> > >Roz
> > >
> > >-----Original Message-----
> > >From: John W. Colby [mailto:jwcolby at colbyconsulting.com]
> > >Sent: 24 January 2005 20:58
> > >To: 'Access Developers discussion and problem solving'
> > >Subject: RE: [AccessD] Data from Informix to Access - dirty reads?
> > >
> > >
> > >How much data? Can it export it to an XML file in a location where
>your
> >fe
> > >can use it? XML has a high overhead but can be useful in cases like
> >this.
> > >
> > >John W. Colby
> > >www.ColbyConsulting.com
> > >
> > >Contribute your unused CPU cycles to a good cause:
> > >http://folding.stanford.edu/
> > >
> > >-----Original Message-----
> > >From: accessd-bounces at databaseadvisors.com
> > >[mailto:accessd-bounces at databaseadvisors.com] On Behalf Of Roz Clarke
> > >Sent: Monday, January 24, 2005 10:23 AM
> > >To: 'Access Developers discussion and problem solving'
> > >Subject: [AccessD] Data from Informix to Access - dirty reads?
> > >
> > >
> > >Hi all
> > >
> > >
> > >We have a bit of a problem with getting data out of our Informix server
> > >since we recently turned on transaction logging for replication. When
> > >extracting data with an Access XP MDE using pass-through queries,
>Access
> > >locks entire tables in the Informix database, which causes transaction
> > >errors and makes the Informix database scarily unstable.
> > >
> > >Our Informix suppliers told us that the way to avoid these locking
>issues
> > >was to set the connection to 'dirty read' before running the SQL.
> >However,
> > >Access cannot execute 2 statements in a pass-through query and it does
> >not
> > >hold the connection open between the execution of 1 statement and the
> >next.
> > >Thus when the query is processed the 'dirty read' setting is no longer
>in
> > >effect.
> > >
> > >We have been racking our brains trying to come up with a workaround.
>Some
> > >further options that we have considered are:
> > >
> > >* Stick the data in a temp table in Informix. This is no good because
> > >the temp table is destroyed automatically when the connection is closed
> >and
> > >there's no way to make it persist long enough to bind it to a report.
> > >* Use a view in Informix. This is no good because views in Informix
> > >cannot be set read-only.
> > >* Create a permanent table in Informix and destroy it when finished
> > >with it. This is far from ideal because Informix does not support
>SELECT
> > >INTO and therefore a table would have to be explicitly constructed with
> > >names columns etc. We really need the system to be flexible so that the
> > >queries can be easily changed.
> > >* Use an ADO recordset. This is a PITA because you cannot bind a
> > >report to a recordset in an MDE and we cannot build the report on the
>fly
>
> >-
> > >we are a Terminal Services site so we will have up to 20 users in one
>FE.
> > >* Create a table in Access and destroy it when finished with it. Can't
> > >think of a better way to induce bloating...
> > >
> > >Has anyone faced this kind of problem before? Any bright ideas? Our
> > >foreheads are starting to bleed...
> > >
> > >TIA
> > >
> > >Roz (and Tom)
> > >
> > >
> > >--
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