Joining the data from two databases

Posted on 2002-05-09
Medium Priority
Last Modified: 2010-04-04
Hi guys,

How would I join the data from two databases?  I have to connect to a FoxPro Database and an Access database, perform a query in each, and then display the results from both queries in a single DBGrid.  Any ideas on the best way to do this.  I am offering alot of points as this is an urgent problem that I need fixing.  I am using Delphi 6.

Question by:gtbikeuk
LVL 27

Expert Comment

ID: 6999243
with bde,
use two tdatabases or provide as databasename the two different aliases

with ado,
use two adoconnections

Accepted Solution

marcoszorrilla earned 1200 total points
ID: 6999258
With Access:
1º.- Create a Compatible table with both (Access and Fox Tables).

2º.- Create a query that delete all the records .

3º.- Create a query that Add all the rows from Access table to the New Access Table.

4º.- Create an other query tha do the same with the Fox Table, (the fox Table must be linked via Access).

Now you connect via ADO with Access and execute this StoreProcedures.

Link the resulting Table via AdoTable and a Dataset, and  link the Dbgrid with this Dataset.


Expert Comment

ID: 6999891
Link the Foxpro tables into the Access database, then run your query against the Access database.  The DAO provides the transparency layer that performs the join, and is reasonably fast about it.  I have used this technique with Access in a pinch to resolve cross database issues in multi-terabyte mainframe databases.

In Access
* use Insert | Table ... Link Table,
* select "FoxPro" in the "Files of Type" entry
* Select the tables you want to link

From this point on the Foxpro tables will be transparently available to any application in any platform that talks to the Access database.
LVL 47

Expert Comment

ID: 7000486
The Swift99 answer is the correct answer, barring any unforseen problems.  

Make sure your FoxPro table is properly indexed and your Access table has an index on the joined column(s).
LVL 47

Expert Comment

ID: 7088377

Why did you select the more complicated, slower, and troublesome solution?

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