Question: I have problems with paths to the database when I use Firebird Embedded at run-time and Firebird at design-time. Can you give me some advice?
Answer: We have consulted with Dmitry Emanov about Firebird Embedded and now we can tell you about possible problems with it.
1. You can not use Firebird or Yaffil Embedded in the debug-mode. The debug-mode allows a single connection to a database; when you try to navigate through your application step-by-step using Delphi debugger it tries to create two connections.
2. If you use related paths to a database (without absolute paths) at design-time you can not be sure that Delphi IDE considers a directory with your current project as default. That's why Firebird (and Yaffil) Embedded sometimes can not find your database file.
Dmitry Emanov recommends to use Firebird SS for development and Firebird Embeddded for distribution. Since the embedded server exclusively locks the database file, it's impossible to access a database from different applications using fbembed.dll. That's exactly the case with Delphi, if your datasets are open in the design-mode and you're running your application under debugger. Just small correction - the embedded server does support multiple connections if they're being established from the single parent process (in different threads).

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