Re: [PHP-DB] Re: Unified DB Query function
Hello, On 07/25/2002 04:35 PM, Andrew Hill wrote: Manual, Certainly - please help us pinpoint any issues. Dan Kalowsky has done some great work in resolving lingering ODBC issues in PHP, and I help in my way with testing and iODBC support. I respect the work you have done with Metabase, but it's a fallacy to suggest that ODBC is weak - some ODBC drivers are indeed week, but a proper driver provides more complete functionality than even native drivers, and is often faster. Andrew you ought to try developing really portable Web applications with PHP using ODBC so you can understand better what I am talking. The real problem is that ODBC was not meant for addressing specifically the actual needs of Web development. The ODBC driver was the most frustrating driver that I developed for Metabase. The problem is that ODBC API does not expose enough information from the underlying database so Metabase could figure how to implement some abstracted features. For instance, Metabase abstracts sequences. If the underlying database supports auto_increment fields, Metabase creates a separate table with a single auto_increment field to emulate a sequence. So far, so good. But how do I retrieve the last inserted number in a database independent way? Is it possible at all with ODBC API? Even if it is possible, I can't see support for the in ODBC API PHP functions. Another issue is selecting specific ranges of result rows. Doing this efficiently depends a lot on the underlying database. In MySQL we use LIMIT. On MS-SQL I use server side cursors. Other database have special keywords that prevent hogging the server or the database connecting sending unnecessary query result data. I know ODBC has several cursor models. Client side cursors are what Metabase ODBC uses already, but that is not as efficient as using specific database keywords. Even if I can use a server side cursor, how can I know with the current ODBC API PHP functions tell if the ODBC driver is capable of using such cursors? There doesn't seem to be a way to do it. Another thing are transactions. How do I tell if the underlying ODBC driver supports transactions? I know you can know it in C calling the ODBC API but there is no support to tell that from PHP. A major flop of ODBC PHP API are NULLs. How do I tell if a result set column has a NULL? It returns an empty string. How do I distinguish result set column empty string values from real NULLs? This needs to be fixed. Other than that, there were problems with odbc_gettypeinfo() more than once in the same script. Depending when you would free the result set it was either crashing PHP or returning an empty result set. I don't know if this was fixed since PHP 4.0.6 but the problem existed and prevented Metabase ODBC driver to figure how to correctly create tables and using correctly certain types of fields like blobs. There are probably other types of problems, but these are those that I remember immediately. Anyway, so far, it seems that using ODBC with PHP is pretty useless especially to write portable database independent applications until these problems are addressed. Because of this I will need to develop ODBC sub-drivers for Metabase that are aware of database specific details that PHP ODBC support is uncapable of providing. Regards, Manuel Lemos -Original Message- From: Manuel Lemos [mailto:[EMAIL PROTECTED]] Sent: Thursday, July 25, 2002 1:39 PM To: [EMAIL PROTECTED] Subject: Re: [PHP-DB] Re: Unified DB Query function Hello, On 07/25/2002 02:34 PM, Andrew Hill wrote: Pierre, Why not use ODBC functions everywhere? I already told you before. ODBC is very weak API for real database abstraction. To make it worse, PHP ODBC API is buggy and not as complete as it could be. As the maintainer of PHP ODBC support, if you are willing to do anything about it, I can help you to pin point the problems that need to be addressed. Otherwise it is quite pointless to even consider using ODBC in PHP unless it is your really alternative. Regards, Manuel Lemos Best regards, Andrew Hill Director of Technology Evangelism OpenLink Software http://www.openlinksw.com Universal Data Access Virtuoso Universal Server -Original Message- From: Pierre-Alain Joye [mailto:[EMAIL PROTECTED]] Sent: Monday, July 01, 2002 1:01 PM To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Subject: Re: [PHP-DB] Re: Unified DB Query function On Mon, 01 Jul 2002 14:55:01 -0300 Manuel Lemos [EMAIL PROTECTED] wrote: Hello, On 07/01/2002 06:46 AM, Casey Allen Shobe wrote: I'm trying to write a unified database query function for an application I have which currently accesses data from both DB2 and Microsoft SQL from a Linux server. I'm using ODBC functions for DB2, and Sybase functions for Microsoft SQL. Why do you re-invent the wheeel and don't you use
Re: [PHP-DB] Re: Unified DB Query function
Hello, On 07/25/2002 02:34 PM, Andrew Hill wrote: Pierre, Why not use ODBC functions everywhere? I already told you before. ODBC is very weak API for real database abstraction. To make it worse, PHP ODBC API is buggy and not as complete as it could be. As the maintainer of PHP ODBC support, if you are willing to do anything about it, I can help you to pin point the problems that need to be addressed. Otherwise it is quite pointless to even consider using ODBC in PHP unless it is your really alternative. Regards, Manuel Lemos Best regards, Andrew Hill Director of Technology Evangelism OpenLink Software http://www.openlinksw.com Universal Data Access Virtuoso Universal Server -Original Message- From: Pierre-Alain Joye [mailto:[EMAIL PROTECTED]] Sent: Monday, July 01, 2002 1:01 PM To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Subject: Re: [PHP-DB] Re: Unified DB Query function On Mon, 01 Jul 2002 14:55:01 -0300 Manuel Lemos [EMAIL PROTECTED] wrote: Hello, On 07/01/2002 06:46 AM, Casey Allen Shobe wrote: I'm trying to write a unified database query function for an application I have which currently accesses data from both DB2 and Microsoft SQL from a Linux server. I'm using ODBC functions for DB2, and Sybase functions for Microsoft SQL. Why do you re-invent the wheeel and don't you use a database abstraction package that handles the database differences of you, like for instance Metabase: http://www.phpclasses.org/metabase Just because diversity rules in our world :). btw, do you have samples codes using the xDefinition methods in metabase ? pa -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP-DB] Re: Unified DB Query function
Manual, Certainly - please help us pinpoint any issues. Dan Kalowsky has done some great work in resolving lingering ODBC issues in PHP, and I help in my way with testing and iODBC support. I respect the work you have done with Metabase, but it's a fallacy to suggest that ODBC is weak - some ODBC drivers are indeed week, but a proper driver provides more complete functionality than even native drivers, and is often faster. Best regards, Andrew Hill Director of Technology Evangelism OpenLink Software http://www.openlinksw.com Universal Data Access Virtuoso Universal Server -Original Message- From: Manuel Lemos [mailto:[EMAIL PROTECTED]] Sent: Thursday, July 25, 2002 1:39 PM To: [EMAIL PROTECTED] Subject: Re: [PHP-DB] Re: Unified DB Query function Hello, On 07/25/2002 02:34 PM, Andrew Hill wrote: Pierre, Why not use ODBC functions everywhere? I already told you before. ODBC is very weak API for real database abstraction. To make it worse, PHP ODBC API is buggy and not as complete as it could be. As the maintainer of PHP ODBC support, if you are willing to do anything about it, I can help you to pin point the problems that need to be addressed. Otherwise it is quite pointless to even consider using ODBC in PHP unless it is your really alternative. Regards, Manuel Lemos Best regards, Andrew Hill Director of Technology Evangelism OpenLink Software http://www.openlinksw.com Universal Data Access Virtuoso Universal Server -Original Message- From: Pierre-Alain Joye [mailto:[EMAIL PROTECTED]] Sent: Monday, July 01, 2002 1:01 PM RE: [PHP-DB] Re: Unified DB Query function, Andrew Hill Re: [PHP-DB] Re: Unified DB Query function, Manuel Lemos RE: [PHP-DB] Re: Unified DB Query function, Andrew Hill [PHP-DB] Pulling the Enum Values from MySQL, Mark Middleton Re: [PHP-DB] Pulling the Enum Values from MySQL, Paul DuBois Re: [PHP-DB] Re: Unified DB Query function, Manuel Lemos -- Chronological -- -- Thread -- 02db01c23412$69095470$[EMAIL PROTECTED]"> Reply via email to RE: [PHP-DB] Re: Unified DB Query function, Andrew Hill [PHP-DB] Pulling the Enum Values from MySQL, Mark Middleton Re: [PHP-DB] Pulling the Enum Values from MySQL, Paul DuBois Re: [PHP-DB] Re: Unified DB Query function, Manuel Lemos -- Chronological -- -- Thread -- 02db01c23412$69095470$[EMAIL PROTECTED]"> Reply via email to <!-- google_ad_client = "pub-7266757337600734"; google_alternate_ad_url = "http://www.mail-archive.com/blank.png"; google_ad_width = 160; google_ad_height = 600; google_ad_format = "160x600_as"; google_ad_channel = "3243237953"; google_color_border = "CE9689"; google_color_bg = ["FF","ECE5DF"]; google_color_link = "006792"; google_color_url = "006792"; google_color_text = "00"; //--> [PHP-DB] Unified DB Query function Casey Allen Shobe Re: [PHP-DB] Unified DB Query function Casey Allen Shobe Re: [PHP-DB] Unified DB Query function Alexander Re: [PHP-DB] Unified DB Query function Casey Allen Shobe [PHP-DB] Re: Unified DB Query function Manuel Lemos Re: [PHP-DB] Re: Unified DB Query function Pierre-Alain Joye Re: [PHP-DB] Re: Unified DB Query function Manuel Lemos RE: [PHP-DB] Re: Unified DB Query function Andrew Hill Re: [PHP-DB] Re: Unified DB Query function Manuel Lemos RE: [PHP-DB] Re: Unified DB Query function Andrew Hill [PHP-DB] Pulling the Enum Values from MySQL Mark Middleton Re: [PHP-DB] Pulling the Enum Values from MySQL Paul DuBois Re: [PHP-DB] Re: Unified DB Query function Manuel Lemos Re: [PHP-DB] Re: Unified DB Query function Casey Allen Shobe RE: [PHP-DB] Re: Unified DB Query function Cal Evans Re: [PHP-DB] Re: Unified DB Query function Manuel Lemos Reply via email to
[PHP-DB] Re: Unified DB Query function
Hello, On 07/01/2002 06:46 AM, Casey Allen Shobe wrote: I'm trying to write a unified database query function for an application I have which currently accesses data from both DB2 and Microsoft SQL from a Linux server. I'm using ODBC functions for DB2, and Sybase functions for Microsoft SQL. Why do you re-invent the wheeel and don't you use a database abstraction package that handles the database differences of you, like for instance Metabase: http://www.phpclasses.org/metabase -- Regards, Manuel Lemos -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] Re: Unified DB Query function
On Mon, 01 Jul 2002 14:55:01 -0300 Manuel Lemos [EMAIL PROTECTED] wrote: Hello, On 07/01/2002 06:46 AM, Casey Allen Shobe wrote: I'm trying to write a unified database query function for an application I have which currently accesses data from both DB2 and Microsoft SQL from a Linux server. I'm using ODBC functions for DB2, and Sybase functions for Microsoft SQL. Why do you re-invent the wheeel and don't you use a database abstraction package that handles the database differences of you, like for instance Metabase: http://www.phpclasses.org/metabase Just because diversity rules in our world :). btw, do you have samples codes using the xDefinition methods in metabase ? pa -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] Re: Unified DB Query function
Hello, On 07/01/2002 03:01 PM, Pierre-Alain Joye wrote: I'm trying to write a unified database query function for an application I have which currently accesses data from both DB2 and Microsoft SQL from a Linux server. I'm using ODBC functions for DB2, and Sybase functions for Microsoft SQL. Why do you re-invent the wheeel and don't you use a database abstraction package that handles the database differences of you, like for instance Metabase: http://www.phpclasses.org/metabase Just because diversity rules in our world :). btw, do you have samples codes using the xDefinition methods in metabase ? What do you mean by xDefinition methods? -- Regards, Manuel Lemos -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] Re: Unified DB Query function
On Monday 01 July 2002 01:55 pm, Manuel Lemos wrote: Why do you re-invent the wheeel and don't you use a database abstraction package that handles the database differences of you, like for instance Metabase. Because I had never heard of it. It doesn't appear to have a sybase module anyways, and they appear to be separate classes for each database, whereas I wanted one for all. Perhaps however I am misreading the site, but it won't let me very far without a username and password. -- Casey Allen Shobe / Network Security Analyst PHP Developer SecureWorks, Inc. / 404.327.6339 x169 / Fax: 404.728.0144 [EMAIL PROTECTED] / http://www.secureworks.net Content is my own and does not necessarily represent my company. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP-DB] Re: Unified DB Query function
Casy, try php.weblogs.com ADODB. It is a database abstraction layer that supports Sybase. (Among other db backends.) HTH, =C= * * Cal Evans * Journeyman Programmer * Techno-Mage * http://www.calevans.com * -Original Message- From: Casey Allen Shobe [mailto:[EMAIL PROTECTED]] Sent: Monday, July 01, 2002 3:04 PM To: [EMAIL PROTECTED] Subject: Re: [PHP-DB] Re: Unified DB Query function On Monday 01 July 2002 01:55 pm, Manuel Lemos wrote: Why do you re-invent the wheeel and don't you use a database abstraction package that handles the database differences of you, like for instance Metabase. Because I had never heard of it. It doesn't appear to have a sybase module anyways, and they appear to be separate classes for each database, whereas I wanted one for all. Perhaps however I am misreading the site, but it won't let me very far without a username and password. -- Casey Allen Shobe / Network Security Analyst PHP Developer SecureWorks, Inc. / 404.327.6339 x169 / Fax: 404.728.0144 [EMAIL PROTECTED] / http://www.secureworks.net Content is my own and does not necessarily represent my company. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] Re: Unified DB Query function
Hello, On 07/01/2002 05:03 PM, Casey Allen Shobe wrote: On Monday 01 July 2002 01:55 pm, Manuel Lemos wrote: Why do you re-invent the wheeel and don't you use a database abstraction package that handles the database differences of you, like for instance Metabase. Because I had never heard of it. It doesn't appear to have a sybase module Now you heard of it. There is a Sybase driver here awaiting to go through the driver conformance tests that verify if Metabase API features work as expected with this driver. You know, rigorous quality control so nobody gets surprises. http://groups.yahoo.com/group/metabase-dev/files/beta/ anyways, and they appear to be separate classes for each database, whereas I Actually separate classes for each database is a good idea because you only call each function fo one database at a time, so it is not bloated as it would be if there was a single class with code for all databases. wanted one for all. Perhaps however I am misreading the site, but it won't let me very far without a username and password. You just need to subscribe to the site, it is free. -- Regards, Manuel Lemos -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
