Lazarus DB Faq
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?
- ZEOS components - have been ported to Lazarus as well.
- Pascal Data Objects - works equally with Delphi and FPC 2.0 (MySQL and Firebird)
- FIBL - FIBL is Sergey Smirnov's port of FreeIB by Greg Deatz. Works with Firebird
- Unified IB - UnifiedIB - Works with Firebird
- FIBL - FIBL - These components provide access to Interbase and Firebird databases.
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
in your IBConnection will connect to the required database.
Note that you don't have to enter a value for the hostname property!
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.
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:
Jan 30, 2007: PDO has added drivers for Firebird 1.5 and 2.0
You can connect to PostgreSQL db by TPQConnection component. This component uses the PostgreSQL's libpq connection library, so you can easily connect almost every PostgreSQL db, but the component doesn't support the following connection options:
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>