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{
This file is part of the Free Pascal run time library.
Copyright (c) 2007 by Michael Van Canneyt, member of the
Free Pascal development team
Standard Data Dictionary Engines registration.
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
{
This unit has a routine and a component to register standard distributed
Data dictionary engines in an application. The Component version is meant for
use in Lazarus: Drop it on a form, set the engines you want to see
registered, and set active to true. When the form is created a run-time,
the selected engines will be registered.
The simple call takes an optional single argument, a set which tells
the call which engines to register. If none is specified, all formats
are registered.
}
unit fpddregstd;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, fpdatadict;
Type
TDataDictEngine = (teDBF,teFirebird,teOracle,teMySQL40,teMySQL41,teMySQL50,
tePostgreSQL,teSQLite3,teODBC);
TDataDictEngines = set of TDataDictEngine;
Const
AllStdDDEngines = [teDBF,teFirebird,teOracle,teMySQL40,teMySQL41,teMySQL50,
tePostgreSQL,teSQLite3,teODBC];
Type
{ TStandardDDEngines }
TStandardDDEngines = Class(TComponent)
Private
FActive: Boolean;
FRegistered,
FEngines: TDataDictEngines;
procedure SetActive(const AValue: Boolean);
Procedure DoRegister;
Procedure DoUnregister;
Public
Constructor Create(AOwner : TComponent); override;
Procedure Loaded; override;
Published
Property Active : Boolean Read FActive Write SetActive;
Property Engines : TDataDictEngines Read FEngines Write FEngines Default AllStdDDEngines;
end;
Function RegisterStdDDEngines(Engines : TDataDictEngines) : TDataDictEngines; overload;
Function RegisterStdDDEngines : TDataDictEngines; overload;
Function UnRegisterStdDDEngines(Engines : TDataDictEngines) : TDataDictEngines;
implementation
uses
fpdddbf,
fpddfb,
fpddpq,
fpddOracle,
fpddsqlite3,
fpddmysql40,
fpddmysql41,
fpddmysql50,
fpddodbc;
Const
StdEngineClasses : Array [TDataDictEngine] of TFPDDEngineClass
= (TDBFDDEngine, TSQLDBFBDDEngine, TSQLDBOracleDDEngine,
TSQLDBMySql40DDEngine, TSQLDBMySql41DDEngine ,
TSQLDBMySql5DDEngine, TSQLDBPostGreSQLDDEngine,
TSQLDBSQLite3DDEngine,TSQLDBODBCDDEngine);
StdEngineRegs : Array [TDataDictEngine] of procedure
= (@InitDBFImporter, @RegisterFBDDEngine, @RegisterOracleDDEngine,
@RegisterMySQL40DDEngine, @RegisterMySQL41DDEngine,
@RegisterMySQL50DDEngine, @RegisterPostgreSQLDDengine,
@RegisterSQLite3DDEngine, @RegisterODBCDDengine);
StdEngineUnRegs : Array [TDataDictEngine] of procedure
= (@DoneDBFImporter, @UnRegisterFBDDEngine, @UnRegisterOracleDDEngine,
@UnRegisterMySQL40DDEngine, @UnRegisterMySQL41DDEngine,
@UnRegisterMySQL50DDEngine, @UnRegisterPostgreSQLDDengine,
@UnRegisterSQLite3DDEngine, @UnRegisterODBCDDengine);
function RegisterStdDDEngines(Engines: TDataDictEngines): TDataDictEngines;
Var
E : TDataDictEngine;
begin
Result:=[];
For E:=Low(TDataDictEngine) to High(TDataDictEngine) do
If (E in Engines) and (Not IsDictionaryEngineRegistered(StdEngineClasses[E])) then
begin
StdEngineRegs[E];
Include(Result,E);
end;
end;
function RegisterStdDDEngines: TDataDictEngines;
begin
Result:=RegisterStdDDEngines(AllStdDDEngines);
end;
function UnRegisterStdDDEngines(Engines: TDataDictEngines): TDataDictEngines;
Var
E : TDataDictEngine;
begin
Result:=[];
For E:=Low(TDataDictEngine) to High(TDataDictEngine) do
If (E in Engines) and IsDictionaryEngineRegistered(StdEngineClasses[E]) then
begin
StdEngineUnRegs[E];
Include(Result,E);
end;
end;
{ TStandardDDEngines }
procedure TStandardDDEngines.SetActive(const AValue: Boolean);
begin
if FActive=AValue then
exit;
FActive:=AValue;
If Not (csLoading in ComponentState) then
If Active then
DoRegister
else
DoUnregister;
end;
procedure TStandardDDEngines.Loaded;
begin
If FActive then
DoRegister;
end;
procedure TStandardDDEngines.DoRegister;
begin
FRegistered:=RegisterSTDDDengines(FEngines);
end;
procedure TStandardDDEngines.DoUnregister;
begin
UnRegisterSTDDDengines(FRegistered);
end;
constructor TStandardDDEngines.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
end;
end.
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