I need to create a Firebird Database programmatically using DBExpress. I have done this for SQL server, by first connecting to Master, then passing in the script for Create to a query, but with Firebird I have a little chicken and egg problem.
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2 Answers
I got a good tip from a collegue that created some code for the Freepascal project. It doesn't use DB express, but according to him it is the only way to create a database with code. This code is based on the InterBase manual, and uses a call from the gdslib / fbclient dll:
procedure TIBConnection.CreateDB;
var ASQLDatabaseHandle,
ASQLTransactionHandle : pointer;
CreateSQL : String;
pagesize : String;
begin
CheckDisConnected;
{$IfDef LinkDynamically}
InitialiseIBase60;
{$EndIf}
ASQLDatabaseHandle := nil;
ASQLTransactionHandle := nil;
CreateSQL := 'CREATE DATABASE ';
if HostName <> '' then
CreateSQL := CreateSQL + ''''+ HostName+':'+DatabaseName + ''''
else
CreateSQL := CreateSQL + '''' + DatabaseName + '''';
if UserName <> '' then
CreateSQL := CreateSQL + ' USER ''' + Username + '''';
if Password <> '' then
CreateSQL := CreateSQL + ' PASSWORD ''' + Password + '''';
pagesize := params.Values['PAGE_SIZE'];
if pagesize <> '' then
CreateSQL := CreateSQL + ' PAGE_SIZE '+pagesize;
if isc_dsql_execute_immediate(@FStatus[0],@ASQLDatabaseHandle,@ASQLTransactionHandle,length(CreateSQL),@CreateSQL[1],Dialect,nil) <> 0 then
CheckError('CreateDB', FStatus);
if isc_detach_database(@FStatus[0], @ASQLDatabaseHandle) <> 0 then
CheckError('CreateDB', FStatus);
{$IfDef LinkDynamically}
ReleaseIBase60;
{$EndIf}
end;
The trick is the isc_dsql_execute_immediate function. I hope this code helps you. Here are the links to the Freepascal source files where this code comes from:
1 Comment
truthseeker
Installation directory of Firebird contains some model examples. Check following directory on your computer: C:\Program Files\Firebird\Firebird_2_5\examples\api Method prototypes can be found in directory: C:\Program Files\Firebird\Firebird_2_5\include
Run a script in isql
isql -i createDB.sql
The file createDB.sql includes the command to create the database as shown below.
SET SQL DIALECT 3;
CREATE DATABASE 'C:\DATABASE\DB.FDB'
USER 'SYSDBA' PASSWORD 'masterkey'
PAGE_SIZE 4096
DEFAULT CHARACTER SET WIN1252;
QUIT;
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