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unit sqldblib;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, db, sqldb;
Type
{ TSQLDBLibraryLoader }
TSQLDBLibraryLoader = Class(TComponent)
private
FCType: String;
FEnabled: Boolean;
FLibraryName: String;
procedure CheckDisabled;
procedure SetCType(AValue: String);
procedure SetEnabled(AValue: Boolean);
procedure SetLibraryName(AValue: String);
Protected
Function GetConnectionDef : TConnectionDef;
Procedure Loaded; override;
Procedure SetDefaultLibraryName; virtual;
Public
Procedure LoadLibrary;
Procedure UnloadLibrary;
Published
Property Enabled : Boolean Read FEnabled Write SetEnabled;
Property ConnectionType : String Read FCType Write SetCType;
Property LibraryName : String Read FLibraryName Write SetLibraryName;
end;
implementation
Resourcestring
SErrConnnected = 'This operation is not allowed while the datatabase is loaded';
SErrInvalidConnectionType = 'Invalid connection type : "%s"';
{ TSQLDBLibraryLoader }
procedure TSQLDBLibraryLoader.CheckDisabled;
begin
If Enabled then
DatabaseError(SErrConnnected,Self);
end;
procedure TSQLDBLibraryLoader.SetCType(AValue: String);
begin
if FCType=AValue then Exit;
CheckDisabled;
FCType:=AValue;
if (FCType<>'') then
SetDefaultLibraryName;
end;
procedure TSQLDBLibraryLoader.SetEnabled(AValue: Boolean);
begin
if FEnabled=AValue then Exit;
if (csLoading in ComponentState) then
FEnabled:=AValue
else
If AValue then
LoadLibrary
else
UnloadLibrary;
end;
procedure TSQLDBLibraryLoader.SetLibraryName(AValue: String);
begin
if FLibraryName=AValue then Exit;
CheckDisabled;
FLibraryName:=AValue;
end;
function TSQLDBLibraryLoader.GetConnectionDef: TConnectionDef;
begin
Result:=sqldb.GetConnectionDef(ConnectionType);
if (Result=Nil) then
DatabaseErrorFmt(SErrInvalidConnectionType,[FCType],Self)
end;
procedure TSQLDBLibraryLoader.Loaded;
begin
inherited;
If FEnabled and (FCType<>'') and (FLibraryName<>'') then
LoadLibrary;
end;
procedure TSQLDBLibraryLoader.SetDefaultLibraryName;
Var
D : TConnectionDef;
begin
D:=GetConnectionDef;
LibraryName:=D.DefaultLibraryName;
end;
procedure TSQLDBLibraryLoader.LoadLibrary;
Var
D : TConnectionDef;
l : TLibraryLoadFunction;
begin
D:=GetConnectionDef;
L:=D.LoadFunction();
if (L<>Nil) then
L(LibraryName);
FEnabled:=True;
end;
procedure TSQLDBLibraryLoader.UnloadLibrary;
Var
D : TConnectionDef;
l : TLibraryUnLoadFunction;
begin
D:=GetConnectionDef;
L:=D.UnLoadFunction;
if L<>Nil then
L;
FEnabled:=False;
end;
end.
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