On Wed, 21 Feb 2007 [EMAIL PROTECTED] wrote:
Albert Y. C. Lai wrote:
[EMAIL PROTECTED] wrote:
Albert Y. C. Lai wrote:
If and only if the database is a purely functional immutable data
structure, this can be done. [...]
Many interesting databases are not purely functional immutable;
Henning Thielemann wrote:
In other words, 'Query a' just assembles a valid SQL-string,
it does not query or execute anything.
Of course, instead of the DSEL approach don't execute anything, only
construct a program in a foreign language which does that it would be
nice to have a database
On Feb 22, 2007, at 14:56 , Henning Thielemann wrote:
On Wed, 21 Feb 2007 [EMAIL PROTECTED] wrote:
Albert Y. C. Lai wrote:
[EMAIL PROTECTED] wrote:
Albert Y. C. Lai wrote:
If and only if the database is a purely functional immutable data
structure, this can be done. [...]
Many
Henning Thielemann wrote:
At
http://www.haskell.org/hawiki/HaskellDbTutorial
it is described, how database queries can be modelled with a monad.
However, I wonder if this is also possible without monads. Say, writing
DB.map col1 $ DB.filter (\row - col2 row == 10+2) myTable
for
SELECT
[EMAIL PROTECTED] wrote:
Albert Y. C. Lai wrote:
If and only if the database is a purely functional immutable data
structure, this can be done. [...]
Many interesting databases are not purely functional immutable; most
reside in the external world and can spontaneously change behind your
Albert Y. C. Lai wrote:
[EMAIL PROTECTED] wrote:
Albert Y. C. Lai wrote:
If and only if the database is a purely functional immutable data
structure, this can be done. [...]
Many interesting databases are not purely functional immutable; most
reside in the external world and can
On Feb 21, 2007, at 20:47 , [EMAIL PROTECTED] wrote:
Albert Y. C. Lai wrote:
[EMAIL PROTECTED] wrote:
Albert Y. C. Lai wrote:
If and only if the database is a purely functional immutable data
structure, this can be done. [...]
Many interesting databases are not purely functional immutable;
