Difference between revisions of "Lazarus DB Faq"

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=== Which version of mySQL is supported? ===
 
=== Which version of mySQL is supported? ===
  
Currently MySQL 4.0, MySQL 4.1 and MySQL 5.0 are supported by de SQLdb components. Make sure you are using the correct connection component for your client library version. So if you have the client libraries installed for MySQL 4.1 then you have to use TMySQL41Connection component, even if the server is running version 4.0 or 5.0.
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Currently MySQL 4.0, 4.1, 5.0 and 5.1 are supported by de SQLdb components. Make sure you are using the correct connection component for your client library version. So if you have the client libraries installed for MySQL 4.1 then you have to use TMySQL41Connection component, even if the server is running version 4.0 or 5.0.
  
 
==== Pascal Data Objects ====
 
==== Pascal Data Objects ====

Revision as of 07:25, 9 August 2011

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General

This FAQ will be directed to database programming with Lazarus.

Where can I find more FAQ?

See the official website www.lazarus.freepascal.org. There is another FAQ as well. In Lazarus Faq you will find a page that once started as a copy of the FAQ from www.lazarus.freepascal.org .

Where can I find database components?

At the moment the SQLdb components are part of the Lazarus package, you only need to install them. If you look in the [$LazarusDir]/components you will see a subdirectory SQLdb. Install the sqldblaz.lpk and you will be able to connect to MySQL, Interbase / Firebird and Postgres servers. Look at Install Packages for help on installing packages.

Are there other components?

You have to download ZEOSDBO_Rework from ZEOS cvs. See also this tutorial for Zeos.

  • FIBL - FIBL is Sergey Smirnov's port of FreeIB by Greg Deatz. Works with Interbase and Firebird
  • Advantage - Advantage TDataSet Descendant. Supports Advantage Database Server version 10.1 or greater.

IB / FB

How do I connect from Linux to a Windows server

Entering the correct path to a database on a Windows server from a Linux client is not very clear.

Say you have installed firebird in F:\Program Files\firebird\. The employee.fdb example database will then be installed in the directory F:\Program Files\firebird\examples\ . The IP-adress of your computer is 192.168.2.100.

Then entering the following databasename

192.168.2.100:F:\Program Files\firebird\examples\employee.fdb

in your IBConnection will connect to the required database.

Note that you don't have to enter a value for the hostname property!

MySQL

Which version of mySQL is supported?

Currently MySQL 4.0, 4.1, 5.0 and 5.1 are supported by de SQLdb components. Make sure you are using the correct connection component for your client library version. So if you have the client libraries installed for MySQL 4.1 then you have to use TMySQL41Connection component, even if the server is running version 4.0 or 5.0.

Pascal Data Objects

There is now an alternative. The functions introduced with MySQL 4.1 and 5.0 like prepared statements, binding, and stored procedures are supported by database API called Pascal Data Objects, which is inspired by PHP Data Objects. All the code and documentation necessary to use this new API is available on sourceforge:

http://pdo.sourceforge.net

Jan 30, 2007: PDO has added drivers for Firebird 1.5 and 2.0

PostgreSQL

You can connect to PostgreSQL db by TPQConnection component. This component uses the PostgreSQL's libpq connection library [1], so you can easily connect almost every PostgreSQL db, but the component doesn't support the following connection options:

  • Port
  • ClientEncoding

Maybe there are other unsupported connection parameters.

The TPQConnection component does not directly support a Port property, but one can pass the port into the component via the Params parameter:

<delphi>PQConnection.Params.Add('port=' + VariableContainingPort);</delphi>

See also