什么是跨平台?
DELPHI跨平台已经不是停留在理论,而是可以实用了。
同一套中间件既能在WINDOWS服务器上面部署,又可以在LINUX服务器上面部署。
而做到这一切,只需要一套源代码,这完全得益于DELPHI 10.2全新的跨平台编译器。
想想,你的同一个中间件同时可以在WINDOWS和LINUX服务器上部署运行,这是一件多么激动人心的事情啊!
笔者不免心情澎湃!同时支持TCP/IP、HTTP通信协议。
LINUX 支持:
- Ubuntu Server (Ubuntu 16.04 LTS)
- RedHat Enterprise Linux (版本 7)
CENTOS 7 服务器上运行中间件:
中间件详情日志:
WINDOWS客户端访问CENTOS7上的中间件并返回查询数据:
同一份源代码只需要编译成不同的目标平台即可:
WINDOWS服务器上部署运行中间件:
支持REST调用
测试客户端代码:
// cxg 2017-9-16 跨平台中间件的客户端
unit Unit1;
interface
uses Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Data.DB, Data.SqlExpr, Data.DBXDataSnap, Data.DBXCommon, IPPeerClient, Unit2, Vcl.Grids, Vcl.DBGrids, Vcl.StdCtrls, FireDAC.Stan.Def, FireDAC.Stan.StorageJSON, FireDAC.Stan.StorageBin, FireDAC.Stan.Intf, FireDAC.Stan.Option, FireDAC.Stan.Param, FireDAC.Stan.Error, FireDAC.DatS, FireDAC.Phys.Intf, FireDAC.DApt.Intf, FireDAC.Comp.DataSet, FireDAC.Comp.Client, Vcl.ExtCtrls, Data.DbxHTTPLayer;
type TForm1 = class(TForm) SQLConnection1: TSQLConnection; DBGrid1: TDBGrid; DataSource1: TDataSource; FDMemTable1: TFDMemTable; btnsave: TButton; btnappend: TButton; btndel: TButton; btnquery: TButton; btnsp: TButton; procedure FormCreate(Sender: TObject); procedure btnsaveClick(Sender: TObject); procedure btnappendClick(Sender: TObject); procedure btndelClick(Sender: TObject); procedure btnqueryClick(Sender: TObject); procedure btnspClick(Sender: TObject); private { Private declarations } public { Public declarations } end;
var Form1: TForm1;
implementation
{$R *.dfm}
uses ujson;
procedure TForm1.btnsaveClick(Sender: TObject); // 保存数据 var c: TServerMethods1Client; sResult: string; begin if FDMemTable1.State in [dsInsert, dsEdit] then FDMemTable1.Post; if FDMemTable1.ChangeCount = 0 then Exit; SQLConnection1.Close; SQLConnection1.Open; c := TServerMethods1Client.Create(SQLConnection1.DBXConnection); try sResult := c.ExecuteSQL(ujson.deltaToJSON(FDMemTable1, 't1', 'c1', '')); if Pos('true', sResult) > 0 then begin FDMemTable1.MergeChangeLog; ShowMessage('save ok'); end else begin FDMemTable1.Cancel; ShowMessage('save fail'); end; finally c.Free; SQLConnection1.Close; end;
end;
procedure TForm1.btnspClick(Sender: TObject); // 执行存储过程 //CREATE PROCEDURE sp2(in a varchar(5)) //BEGIN //SELECT * FROM t1 where c1=a; //END; var c: TServerMethods1Client; begin SQLConnection1.Close; SQLConnection1.Open; c := TServerMethods1Client.Create(SQLConnection1.DBXConnection); try ujson.jsonToDB(c.SPOpen('sp2', '{"a":"1"}'), FDMemTable1); finally c.Free; SQLConnection1.Close; end; end;
procedure TForm1.btnqueryClick(Sender: TObject); // 查询数据 var c: TServerMethods1Client; begin SQLConnection1.Close; SQLConnection1.Open;
c := TServerMethods1Client.Create(SQLConnection1.DBXConnection); try ujson.jsonToDB(c.QuerySQL('select * from t1'), FDMemTable1); FDMemTable1.MergeChangeLog; finally c.Free; SQLConnection1.Close; end; end;
procedure TForm1.btnappendClick(Sender: TObject); // 新增 begin FDMemTable1.Append; end;
procedure TForm1.btndelClick(Sender: TObject); // 删除数据 var c: TServerMethods1Client; sResult: string; begin if not FDMemTable1.IsEmpty then begin FDMemTable1.Delete; // del SQLConnection1.Close; SQLConnection1.Open; c := TServerMethods1Client.Create(SQLConnection1.DBXConnection); try sResult := c.ExecuteSQL(ujson.deltaToJSON(FDMemTable1, 't1', 'c1', '')); if Pos('true', sResult) > 0 then begin FDMemTable1.MergeChangeLog; ShowMessage('del ok'); end else begin FDMemTable1.Cancel; ShowMessage('del fail'); end; finally c.Free; SQLConnection1.Close; end; end; end;
procedure TForm1.FormCreate(Sender: TObject); begin FDMemTable1.CachedUpdates := True; // 否则不能保存 end;
end.
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