{*********************************************************}
{ }
{ Zeos Database Objects }
{ DBC Layer Proxy Connectivity Classes }
{ }
{ Originally written by Jan Baumgarten }
{ }
{*********************************************************}
{@********************************************************}
{ Copyright (c) 1999-2020 Zeos Development Group }
{ }
{ License Agreement: }
{ }
{ This library 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. See the GNU Lesser General }
{ Public License for more details. }
{ }
{ The source code of the ZEOS Libraries and packages are }
{ distributed under the Library GNU General Public }
{ License (see the file COPYING / COPYING.ZEOS) }
{ with the following modification: }
{ As a special exception, the copyright holders of this }
{ library give you permission to link this library with }
{ independent modules to produce an executable, }
{ regardless of the license terms of these independent }
{ modules, and to copy and distribute the resulting }
{ executable under terms of your choice, provided that }
{ you also meet, for each linked independent module, }
{ the terms and conditions of the license of that module. }
{ An independent module is a module which is not derived }
{ from or based on this library. If you modify this }
{ library, you may extend this exception to your version }
{ of the library, but you are not obligated to do so. }
{ If you do not wish to do so, delete this exception }
{ statement from your version. }
{ }
{ }
{ The project web site is located on: }
{ http://zeoslib.sourceforge.net (FORUM) }
{ http://sourceforge.net/p/zeoslib/tickets/ (BUGTRACKER) }
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{ }
{ http://www.sourceforge.net/projects/zeoslib. }
{ }
{ }
{ Zeos Development Group. }
{********************************************************@}
unit ZPlainProxyDriver;
interface
{$I ZPlain.inc}
{$IFDEF ENABLE_PROXY}
uses SysUtils, Classes, {$IFDEF MSEgui}mclasses,{$ENDIF}
ZCompatibility, ZPlainDriver,
{$IFDEF ENABLE_INTERNAL_PROXY}ZPlainProxyDriverInternalProxy, {$ENDIF}
ZPlainProxyDriverIntf;
{$IFNDEF ENABLE_INTERNAL_PROXY}
const
WINDOWS_DLL_LOCATION = 'libzdbcproxy.dll';
LINUX_DLL_LOCATION = 'libzdbcproxy.'+SharedSuffix;
{$ENDIF ENABLE_INTERNAL_PROXY}
{$IFNDEF ENABLE_INTERNAL_PROXY}
type
TZDbcProxy_GetInterface = function(): IZDbcProxy; stdcall;
TZDbcProxy_GetLastErrorStr = function(): WideString; stdcall;
{$ENDIF ENABLE_INTERNAL_PROXY}
{ ************* Plain API Function variables definition ************ }
type
{** Represents a generic interface to DBC Proxy native API. }
IZProxyPlainDriver = interface (IZPlainDriver)
['{89102437-9555-449C-922A-5734581AC569}']
function GetLibraryInterface(): IZDbcProxy;
function GetLastErrorStr(): WideString;
end;
{** Implements a base driver for DBC Proxy}
TZProxyBaseDriver = class (TZAbstractPlainDriver, IZPlainDriver, IZProxyPlainDriver)
private
protected
{$IFNDEF ENABLE_INTERNAL_PROXY}
FGetInterface: TZDbcProxy_GetInterface;
FGetLastErrorStr: TZDbcProxy_GetLastErrorStr;
{$ENDIF ENABLE_INTERNAL_PROXY}
function GetUnicodeCodePageName: String; override;
procedure LoadCodePages; override;
function Clone: IZPlainDriver; override;
procedure LoadApi; override;
public
constructor Create;
function GetProtocol: string; override;
function GetDescription: string; override;
function GetLibraryInterface(): IZDbcProxy;
function GetLastErrorStr(): WideString;
end;
{$ENDIF ENABLE_PROXY}
implementation
{$IFDEF ENABLE_PROXY}
uses ZPlainLoader, ZEncoding{$IFDEF WITH_UNITANSISTRINGS}, AnsiStrings{$ENDIF};
{ TZSQLiteBaseDriver }
function TZProxyBaseDriver.GetUnicodeCodePageName: String;
begin
Result := 'UTF-16'
end;
procedure TZProxyBaseDriver.LoadCodePages; //Egonhugeist
begin
{ MultiByte }
AddCodePage('UTF-16', 4, ceUTF16, zCP_UTF16); //Setting this will be ignored by actual Excute of Plaindriver
end;
constructor TZProxyBaseDriver.Create;
begin
inherited create;
{$IFNDEF ENABLE_INTERNAL_PROXY}
FLoader := TZNativeLibraryLoader.Create([]);
{$IFDEF MSWINDOWS}
FLoader.AddLocation(WINDOWS_DLL_LOCATION);
{$ELSE}
FLoader.AddLocation(LINUX_DLL_LOCATION);
FLoader.AddLocation(LINUX_DLL_LOCATION+'.0');
{$ENDIF}
{$ENDIF ENABLE_INTERNAL_PROXY}
end;
procedure TZProxyBaseDriver.LoadApi;
begin
{ ************** Load adresses of API Functions ************* }
{$IFNDEF ENABLE_INTERNAL_PROXY}
with Loader do
begin
{@}FGetInterface := GetAddress('GetInterface');
{@}FGetLastErrorStr := GetAddress('GetLastErrorStr');
end;
{$ENDIF ENABLE_INTERNAL_PROXY}
end;
function TZProxyBaseDriver.GetProtocol: string;
begin
Result := 'WebServiceProxy';
end;
function TZProxyBaseDriver.GetDescription: string;
begin
Result := 'Native driver for Web Service based Proxy driver';
end;
function TZProxyBaseDriver.Clone: IZPlainDriver;
begin
Result := TZProxyBaseDriver.Create;
end;
function TZProxyBaseDriver.GetLibraryInterface(): IZDbcProxy;
begin
{$IFNDEF ENABLE_INTERNAL_PROXY}
Result := FGetInterface();
{$ELSE}
Result := ZPlainProxyDriverInternalProxy.GetInterface;
{$ENDIF ZEOS_PROXY_USE_INTERNAL_PROXY}
end;
function TZProxyBaseDriver.GetLastErrorStr(): WideString;
begin
{$IFNDEF ENABLE_INTERNAL_PROXY}
Result := FGetLastErrorStr();
{$ELSE}
Result := ZPlainProxyDriverInternalProxy.GetLastErrorStr;
{$ENDIF ZEOS_PROXY_USE_INTERNAL_PROXY}
end;
{$ENDIF ENABLE_PROXY}
end.
