How to execute Interbase SQL commands with Delphi code

Last week, I bought Delhi 3 Professional, which comes with a local InterBase database server, but sadly without any manuals concerning how to use Interbase databases from within Delphi.

Until now, I succesfully created some tables, one named documents, and one named objects.  The documents table was created using the folowing SQL statement :
 
 CREATE TABLE DOCUMENTS (
   DOC_ID INTEGER NOT NULL,
   DOC_TYPE CHAR(25),
   DOC_NBR_OBJ INTEGER NOT NULL,
   DOC_ROOT_OBJ INTEGER,
   DOC_INFO_OBJ INTEGER,
   DOC_CRE_DATE DATE DEFAULT "NOW" NOTNULL,
   DOC_MOD_DATE DATE
 )
 
I also created a generator, which gives a unice incremental number to each document record :
 
 CREATE GENERATOR DOC_ID_GEN;
 SET GENERATOR DOC_ID_GEN TO 14
 
 The trigger :
 
 CREATE TRIGGER SET_DOC_ID FOR DOCUMENTS BEFORE INSERT POSITION 0 AS
 BEGIN
      NEW.DOC_ID = Gen_ID (DOC_ID_GEN, 1);
 END
 
 Now I used an SQL command from withing the Database explorer to test if this trigger works correctly :

 INSERT INTO DOCUMENTS (DOC_TYPE, DOC_NBR_OBJ)
 VALUES ('Cre w SQL in DB Explorer', 3);
 
 Until here everything works correctly.  The record is added, and it is given a unique number which increments for each added record.
 
 Now comes my question : How can I code such commands into Delphi ? Is there some way I can execute SQL commands from withing the code of a Delphi program, which components should I use, and how do I code it.

If anybody can help me with this problem, I would really appreciate it.
 
 Any comments or help can be sent to :
 
 --
 
 Stefaan Lesage
 Fotek nv; Belgium
 Stefaan@fotek.com