Yes, that's true, but then you're doubling the amount of data. And everytime you change the table in one database, you've to copy the table in the other database. What if this has to be done daily? So, I need to find a way from which we'll benefit the most. Tom. ----- Original Message ----- From: "Phil Harris" <phil.harris@zope.co.uk> To: "Chris Gray" <cpgray@library.uwaterloo.ca>; "Tom Deprez" <tom.deprez@uz.kuleuven.ac.be> Cc: <zope@zope.org> Sent: Monday, December 04, 2000 5:06 PM Subject: Re: [Zope] ZSQLMethods
Depending on the number of records in the tables this could get *very* slow *very* quickly.
Surely the ideal would be to move/copy the tables into the same DB.
Phil
----- Original Message ----- From: "Chris Gray" <cpgray@library.uwaterloo.ca> To: "Tom Deprez" <tom.deprez@uz.kuleuven.ac.be> Cc: <zope@zope.org> Sent: Monday, December 04, 2000 3:21 PM Subject: Re: [Zope] ZSQLMethods
Try something like:
<dtml-in selectFromTable1> <dtml-in selectFromTable2> <dtml-if idFromTable1 = idFromTable2> ....display parts of the two records.... </dtml-if> </dtml-in> </dtml-in>
This keeps it to two db queries and the join work is done by Zope.
Chris
On Mon, 4 Dec 2000, Tom Deprez wrote:
Hi Chris,
Thanks, is this code still efficient if the tables relate to 1:1 and you need to show a list of all records in a tabulare table?
eg key, NAME, ALIAS, ....
where NAME is from database1 and ALIAS is from database2
The code below would impact that for every record in database1, I've to query database2 Is there another way to do this? (more efficient?, ie less database query)
Tom.
----- Original Message ----- From: "Chris Gray" <cpgray@library.uwaterloo.ca> To: "Tom Deprez" <tom.deprez@uz.kuleuven.ac.be> Cc: <zope@zope.org> Sent: Monday, December 04, 2000 3:45 PM Subject: Re: [Zope] ZSQLMethods
You want something along these lines:
<dtml-in selectFromTable1> <dtml-in expr="selectFromTable2(id=_['id'])"> ....display record.... </dtml-in> </dtml-in>
This would be more efficient than pulling out the whole of two tables.
Chris
On Mon, 4 Dec 2000, Tom Deprez wrote:
Hi,
I'm wondering how the following can be done.
I've 2 databases. I want to do a 'join' with 2 tables, both in a different database. Is it possible to retrieve data of both tables with a ZSQLMethod and then do a programatically join? What's the easiest python way?
Thanks, Tom.
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