Обсуждение: pg & Delphi
Good day. I want to enter Postges into project, which has so rectriction, that client should be written on Delphi (CBuilder). Please, prompt me how to adjust Delphi to usePostgres. Dmitry Turin SQL4 (4.2.0) http://sql40.chat.ru HTML6 (6.4.0) http://html60.chat.ru Unicode2 (2.0.1) http://unicode2.chat.ru Computer2 (2.0.3) http://computer20.chat.ru
On Tue, 28 Aug 2007, Kitter Georgiy wrote: > which has so rectriction, that client should be written on Delphi (CBuilder). > Please, prompt me how to adjust Delphi to use Postgres. We use pgExpress driver from http://vitavoom.com It is commercial, but cheep and works well. You can try ODBC as well, but it is too slow. Daniel
Kitter Georgiy wrote: > Good day. > > I want to enter Postges into project, > which has so rectriction, that client should be written on Delphi (CBuilder). > Please, prompt me how to adjust Delphi to use Postgres. You should be able to connect via ODBC. Googling "PostgreSQL Delphi" seems to give some useful links. -- Richard Huxton Archonet Ltd
--- Kitter Georgiy <sql4-en@narod.ru> escribió: > Good day. > > I want to enter Postges into project, > which has so rectriction, that client should be > written on Delphi (CBuilder). > Please, prompt me how to adjust Delphi to use > Postgres. > You can to use: ZeoslibDBO (free, but it hasn´t ssl soport). I test it and work fine. http://downloads.sourceforge.net/zeoslib/ZEOSDBO-6.6.1_beta.zip?modtime=1172471217&big_mirror=0 PostgresDAC (free trial, it has ssl soport). I use it and work very fine-fast. http://www.microolap.com/downloads/postgresdac/pg.zip They are use as the BDE component. Good luck ! SACL ____________________________________________________________________________________ ¡Sé un mejor besador! Compartí todo lo que sabés sobre besos en http://ar.yahoo.com/promos/mejorbesador.html
On 8/28/07, Richard Huxton <dev@archonet.com> wrote: > Kitter Georgiy wrote: > > Good day. > > > > I want to enter Postges into project, > > which has so rectriction, that client should be written on Delphi (CBuilder). > > Please, prompt me how to adjust Delphi to use Postgres. > > You should be able to connect via ODBC. Googling "PostgreSQL Delphi" > seems to give some useful links. > Delphi should let you use dlls written in other languages (it did when I used Delphi last, which has been years). So I'd just use libpq.dll. -Josh
Very thanks to all. Some questions: RH> You should be able to connect via ODBC. I don't know Delphi well (i used only BDE). What Delphi's object should be used to connect via ODBS (instead of BDE-components TTable, TDatabase) ? JT> Delphi should let you use dlls written in other languages. JT> So I'd just use libpq.dll. Similarly, What Delphi's object should be used to connect via libpq.dll (instead of BDE-components TTable, TDatabase - i'd like to know all ways to connect Postgres and Delphi)? Dmitry Turin SQL4 (4.3.0) http://sql40.chat.ru HTML6 (6.4.0) http://html60.chat.ru Unicode2 (2.0.1) http://unicode2.chat.ru Computer2 (2.0.3) http://computer20.chat.ru
On 9/1/07, Dmitry Turin <sql4-en@narod.ru> wrote: > Very thanks to all. > Some questions: > > RH> You should be able to connect via ODBC. > I don't know Delphi well (i used only BDE). > What Delphi's object should be used to connect via ODBS > (instead of BDE-components TTable, TDatabase) ? > > JT> Delphi should let you use dlls written in other languages. > JT> So I'd just use libpq.dll. > Similarly, What Delphi's object should be used to connect via libpq.dll > (instead of BDE-components TTable, TDatabase - > i'd like to know all ways to connect Postgres and Delphi)? If I remember correctly, when I was doing MySQL and Delphi (again, it's been years), we didn't use components to talk to the database -- instead, we simply called functions out of libmysql.dll. Were I doing the same thing with PostgreSQL today, I'd call functions directly from libpq.dll. -Josh/eggyknap
I have a question that I've thought in my head about using triggers, but
I figure to ask people that do SQL more than I. So, I have a table that
I want two columns.
(1) A featured column which is for only 1 row, once it switched to
another row than all other rows must be false
title | author_id | categories | featured
--------------------------------+-----------+------+-----Thierry Beta Release | 3 | 11 |
TrueDifferentApproach | 3 | 11 |Ottawa Does Not Heart Hip-Hop | 3 | 11 |
(2) A featured column by category and only allow category_feature equal
to the number of categories.
Is SQL the way to go (and how - ideas), or should I use python for the
heavy lifting?
Thanks for any input,
J
--- PostgreSQL Admin <postgres@productivitymedia.com> wrote: > I have a question that I've thought in my head about using triggers, but > I figure to ask people that do SQL more than I. So, I have a table that > I want two columns. > > (1) A featured column which is for only 1 row, once it switched to > another row than all other rows must be false > > title | author_id | categories | featured > --------------------------------+-----------+------+----- > Thierry Beta Release | 3 | 11 | True > Different Approach | 3 | 11 | > Ottawa Does Not Heart Hip-Hop | 3 | 11 | > > (2) A featured column by category and only allow category_feature equal > to the number of categories. > > Is SQL the way to go (and how - ideas), or should I use python for the > heavy lifting? Are you saying that you have two featured columns? One column for category features and the other for article feature? If I understand you correctly, Item 1 can be achieved nicely with partial indexes. for example, if you only want to allow one row in the entire table to have "feature"= true: CREATE INDEX Only_one_row_true ON Your_table ( featured ) WHERE featured = true; Or if you want to only allow 1 featured article per catagory then: CREATE INDEX Only_one_row_true_per_catagory ON Your_table ( catigories, featured ) WHERE featured = true; This will ensure that the sum( featured = true ) <= sum( unique( catagories )). Regards, Richard Broersma Jr.
OOPS! --- Richard Broersma Jr <rabroersma@yahoo.com> wrote: > CREATE UNIQUE INDEX Only_one_row_true > ON Your_table ( featured ) > WHERE featured = true; > > Or if you want to only allow 1 featured article per catagory then: > > CREATE UNIQUE INDEX Only_one_row_true_per_catagory > ON Your_table ( catigories, featured ) > WHERE featured = true; I forgot the unique part of the DDL. Regards, Richard Broersma Jr.
> --- Richard Broersma Jr <rabroersma@yahoo.com> wrote: > >> CREATE UNIQUE INDEX Only_one_row_true >> ON Your_table ( featured ) >> WHERE featured = true; >> >> Or if you want to only allow 1 featured article per catagory then: >> >> CREATE UNIQUE INDEX Only_one_row_true_per_catagory >> ON Your_table ( catigories, featured ) >> WHERE featured = true; >> > > I forgot the unique part of the DDL. > > Regards, > Richard Broersma Jr. > > Thanks for the information. I will check it out and get back to you. Thanks again, J