Re: merge multiple databases

From: DIOS (sindizzy.pak_at_softhome.net)
Date: 05/10/04 

Date: Mon, 10 May 2004 23:59:14 GMT

Jim,

Thanks for all the info. i appreciate it. i have a very good understanding
of how
Acess databases are structured. In the end what i need is just an algorithm
to
dump each table from each database into another new database. the
autu-increment
on the primary keys is what the problem is. I can make links but in the end
i still
have to iterate through each record like Ken halter stated. I dont see any
way around
this and thats why i was asking for suggestions. Since this will be done not
very often i
may just stick to my original plan of looping through records and processing
the merging
that way.

Also like i said, all this has to be done through code and I have yet to do
any linking
through code so i may just INSERT each tabel into my new database, do the
processing
on that table, and then DROP it.

Again thanks for the info.

AGP 

-- 
**********************************************************************
Unpak my email address before sending me personal email
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"Jim Carlock" <anonymous@127.0.0.1> wrote in message
news:OPLKncsNEHA.1400@TK2MSFTNGP10.phx.gbl...
> Okay, first some comments on the process I'm describing below.
> You need to create a new Access datafile (mdb) to store all in.
> This file can be installed into the folder that other access files are
> located in. This will work not only with Access databases, but
> with just about any type of data system in the world.
>
> With that in mind:
>
> (1) Create the new mdb file.
> (2) Open the newly created Access database. Create the links
> inside the new Access mdb. Keep in mind that having all the
> mdb's in the same folder will help greatly. Name the links:
>
> lnkDrive
> lnkFiles
> lnkSubFiles
>
> If there are any other files, continue creating these links.
> The goal is to gather all the information into one file.
>
> (3) Once all the links are created, you are ready to start
> creating the Make tables. Do this inside Access. It's very
> easy to do. Click on the Queries icon. Click on
> "Create new query", then select lnkDrive as the table to
> work with. Click on the (*) asterisk inside the field list.
> Right click inside the query and click on Query Type...,
> then click on Make Table. You'll be prompted for a file
> name. Type in tDrive. Save the query and exit it.
>
> (4) Test it out inside of Access, but NOTE: when working with
> queries inside Access, make sure you have back ups of the files
> you are going to play around with. When playing with these queries,
> it's way to easy to delete a whole table, or modify and totally
> obliterate a whole table. I can't emphasize it enough. Make sure you
> have a valid backup before you start playing. :-)
>
> The power of the Internal Access queries should be classified as
> the 8th wonder of the world.
>
> (5) Once you have your set of Make Table queries created, it's
> time to start setting up the code inside of VB to run the action
> queries.
>
> (6) Once all the tables are localized into the new access file,
> you can start messing with the queries there to present the data
> to yourself. Once you have a proper query in Access, DAO
> works extremily efficiently and fast handling the internal Access
> queries.
>
> I don't know what your full understanding is of Access, so
> pardon me if I am oversimplifying things.
>
> Take it one step at a time, and break it up into the proper
> steps, it's really amazing.
> ---------------------------------------
> Some important concepts to think about and understand
> when working with Access:
> ---------------------------------------
> When you work with Access, think of tables as tables of
> information, and think of queries as one of two types. They
> are either Action queries or Select queries. Action queries
> perform some operation (modification) on the data, and the
> Select queries just present the data (including sorting and
> sorting is not considered an action). It's important to keep
> the concepts of Action vs (I think it might be called Passive)
> as separate notions in your head.
>
> One other thing I'll mention is that I've used such methods in
> extracting data from ODBC sources, and they were very very
> large tables of data, which covered accounts receivables
> where one particular Home Depot account had thousands
> of Items that were sold, and amounted to millions of dollars.
> I learned some great things about Access when I was doing
> such things:
>
> (1) Access is probably the best file extraction organism in the
> universe and I would classify it as the 8th wonder of the world.
> (2) Internal Access queries, rather than using SQL syntax
> through VB is much much faster.
> (3) I've set and configured 30 or so internal access queries to
> be called in sequence and they all start with the initial make
> table query to copy data from an original database to a local
> access mdb.
>
> I'll wait for a reply from you before I continue with this. Let me
> know if this helps at all.
>
> -- 
> Jim Carlock
> http://www.microcosmotalk.com/
> Post replies to the newsgroup.
>
>
> "DIOS" wrote:
> The database merge is going to be done completely through code.
> The end user does not even know that that databases are Access97
> databases. I will keep the same table structure in the new database.
> I just want to dump all database records into the new database but because
> some IDs may be the same then i just want to account for that. Again,
> i have a plan but its based on iterating through each record. There should
> be
> an easier way to do this.
>
> AGP
>
>
> -- 
>
> **********************************************************************
> Unpak my email address before sending me personal email
> **********************************************************************
>
> "Jim Carlock" <anonymous@127.0.0.1> wrote in message
> news:uVoycxkNEHA.1004@TK2MSFTNGP10.phx.gbl...
> > Create links to the tables. If you need to move data, then via
> > Access create a make table query that uses the link to create
> > a new table.
> >
> > I typically name the links, lnkNames and then create the new
> > table and give it name, tNames. You'll have to be careful with
> > the links inside of Access. Make sure you're working with
> > backups while you're playing around. You don't want to delete
> > a whole table on accident.
> >
> > I tend to use DAO to do everything, but it can be done in ADO
> > as well.
> >
> > If you plan on reusing the tables over and over, say, you're
> > going to delete everything in the table, and recreate it, you'll
> > need to set up a loop to go through the tabledefs to delete
> > a specific table, before executing the make table query.
> >
> > The make table queries are ran with a DAO.Execute statement,
> > as it's an action query. Select queries can be run opened as
> > recordsets. Action queries need to be executed.
> >
> > Let me know if you need any other help.
> >
> > -- 
> > Jim Carlock
> > http://www.microcosmotalk.com/
> > Post replies to the newsgroup.
> >
> >
> > "DIOS" wrote:
> > I have multiple Access97 databases that i want to merge into one single
> big
> > database. I have some ideas on how to do it but would like any
suggestions
> > on doing the mrege more efficiently. Currently i am using a VB app to
> > connect to
> > the various databases via DAO. The tables look like so:
> >
> > tblDrive
> > --------
> > DriveID (primary key)
> > fldTitle
> > fldDesc
> >
> > tblFiles
> > --------
> > FileID (primary key)
> > DriveID
> > fldFTitle
> > fldFSize
> >
> > tblSubFiles
> > -----------
> > SubFileID (primary key)
> > FileID
> > DriveID
> >
> > Basically each drive has many files and each file has many subfiles.
> > I was going to iterate through each record in tblDrive and then do
> > a query with the DriveID and get all proper records from tblFiles
> > and add those to the new database with a new DriveID. Then for
> > my tblFiles recordset I was going to perform a query with the
> > same DriveID and the same FileID and take those records and
> > add them to the new database. This seems like rather inefficient
> > to me but i cant see how to do it in a more elegant manner.
> >
> > tia
> > AGP
>
>

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