Delphi2010 DataSnap架构的特性和功能_架构_delphi_其他

<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/6247721c62b5053d3caf8dc3/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6247721c62b5053d3caf8dc3/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0"><span class="fc4 sc0"> </span></div><div class="t m0 x2 h3 y2 ff1 fs1 fc1 sc0 ls0 ws1">Delphi 2010 Dat<span class="_ _0"></span>aSnap<span class="_ _1"> </span><span class="ff2 ls1 ws2">白页</span><span class="ws3"> <span class="ff2 ws0">逆水寒翻译</span> <span class="ws0">QQ:893444516 </span></span></div><div class="t m0 x3 h4 y3 ff1 fs2 fc0 sc0 ls2 ws4">2010<span class="ls0 ws0">-</span>03<span class="ls0 ws0">-</span>31<span class="ls0 ws0"> </span>15:45<span class="_ _0"></span><span class="ls0 ws0"> </span></div><div class="t m0 x4 h5 y4 ff3 fs3 fc0 sc0 ls0 ws0"> <span class="_ _2"> </span> </div><div class="t m0 x5 h6 y5 ff4 fs4 fc0 sc0 ls0 ws0">白页<span class="ff3"> <span class="_ _1"> </span> </span></div><div class="t m0 x5 h7 y6 ff5 fs5 fc2 sc0 ls0 ws5">Delphi 2010 DataSnap:<span class="_ _3"></span> <span class="_ _4"> </span><span class="ff4 sc1 ls3 ws6">何时<span class="ls0 ws0">需要数据</span></span><span class="ws0">,<span class="ff4 sc1">如何</span></span></div><div class="t m0 x5 h7 y7 ff4 fs5 fc2 sc1 ls3 ws6">获取数据<span class="ff5 sc0 ls0 ws0">. </span></div><div class="t m0 x5 h8 y8 ff6 fs6 fc0 sc0 ls4 ws7">Bob Swart<span class="ls0 ws0">—<span class="ls4">Swart T<span class="_ _3"></span>raining&Consultanc<span class="_ _3"></span>y(eBob42)</span> </span></div><div class="t m0 x5 h8 y9 ff3 fs7 fc0 sc0 ls5 ws8">2009 <span class="_ _5"> </span><span class="ff4 ls0 ws0">年</span>10<span class="ff4 ls0 ws0">月<span class="ff6 fs6"> </span></span></div><div class="t m0 x5 h5 ya ff3 fs3 fc0 sc0 ls0 ws0"> </div><div class="t m0 x5 h9 yb ff7 fs7 fc0 sc0 ls5 ws0">Corporate Headquarters<span class="ls0 ws9"> <span class="ws0"> <span class="_ _5"> </span></span></span>EM<span class="_ _0"></span>EA Headquarters <span class="_ _5"> </span><span class="ls0 ws9"> <span class="ws0">Asia-</span></span>Pacific Headquarters<span class="ls0"> </span></div><div class="t m0 x5 h9 yc ff7 fs7 fc0 sc0 ls5 ws8">100 <span class="ws0">California Street, 12th Floor<span class="ls0"> <span class="_ _5"> </span><span class="wsa"> </span></span>York House<span class="ls0 ws9"> </span>L7. 313 La <span class="_ _0"></span>Trobe Street<span class="ls0"> </span></span></div><div class="t m0 x5 h9 yd ff7 fs7 fc0 sc0 ls5 ws0">San Francisco, California 94111<span class="ls0 ws9"> </span>18 York Road<span class="ls0 ws9"> <span class="_ _0"></span> <span class="ls5 ws0">Melbourne VIC 3000<span class="ls0"> </span></span></span></div><div class="t m0 x6 h9 ye ff7 fs7 fc0 sc0 ls5 ws0">Maidenhead, Berkshire<span class="ls0 wsa"> </span><span class="ws8">Australia</span><span class="ls0"> </span></div><div class="t m0 x6 h9 yf ff7 fs7 fc0 sc0 ls5 ws0">SL6 1SF, United Kingdom<span class="ls0"> </span></div><div class="t m0 x5 h9 y10 ff7 fs7 fc0 sc0 ls0 ws0"> </div><div class="t m0 x5 h9 y11 ff7 fs7 fc0 sc0 ls5 ws0">Copyright © 2009 Bob Swart (aka Dr.Bob <span class="ls0">- </span><span class="fc3 ws8">www.drbob42.com</span>). All Rights Reserved.</div><div class="t m0 x7 h5 y12 ff3 fs3 fc0 sc0 ls0 ws0"> </div><div class="t m0 x5 ha y13 ff3 fs7 fc0 sc0 ls0 ws0"> </div></div><div class="pi" data-data='{"ctm":[1.565817,0.000000,0.000000,1.565817,0.000000,0.000000]}'></div></div> </body> </html>

<div id="pf2" class="pf w0 h0" data-page-no="2"><div class="pc pc2 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6247721c62b5053d3caf8dc3/bg2.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0"><span class="fc4 sc0"> </span></div><div class="t m0 x2 h3 y2 ff1 fs1 fc1 sc0 ls0 ws1">Delphi 2010 Dat<span class="_ _0"></span>aSnap<span class="_ _1"> </span><span class="ff2 ls1 ws2">白页</span><span class="ws3"> <span class="ff2 ws0">逆水寒翻译</span> <span class="ws0">QQ:893444516 </span></span></div><div class="t m0 x3 h4 y3 ff1 fs2 fc0 sc0 ls2 ws4">2010<span class="ls0 ws0">-</span>03<span class="ls0 ws0">-</span>31<span class="ls0 ws0"> </span>15:45<span class="_ _0"></span><span class="ls0 ws0"> </span></div><div class="t m0 x5 hb y14 ff4 fs7 fc0 sc0 ls0 ws0">在这个白页中我们将讲解<span class="ff3 ls5">Delphi2010 DataSnap</span>架构新的特<span class="_ _3"></span>性和功能<span class="ff3 ls5 ws8">. <span class="_ _5"> </span></span><span class="ff3"> </span></div><div class="t m0 x5 hc y15 ff6 fs4 fc5 sc2 ls6 ws0">1. DATASNAP <span class="ff2 wsb">历史</span><span class="ls0"> <span class="sc0"> </span></span></div><div class="t m0 x8 hd y16 ff2 fs7 fc0 sc0 ls7 wsc">作为<span class="ff6 ls8 wsd">MIDAS</span><span class="ls9 wse">起始于<span class="ff6 ls8 wsd">Delphi3<span class="_ _3"></span></span><span class="ls0 ws0">，<span class="ff6 ls8 wsd">Delphi4<span class="_ _3"></span></span>是<span class="ff6 ls8 wsf">MIDAS II</span>，<span class="_ _3"></span><span class="ff6 ls8 wsd">Delphi5</span></span></span>中是<span class="ff6 ls8 wsd">MIDASIII</span>，而后基于<span class="ff6 ls8 wsd">COM<span class="_ _3"></span></span>远程数据模块方式使</div><div class="t m0 x5 hd y17 ff2 fs7 fc0 sc0 ls0 ws0">用<span class="_ _3"></span><span class="ff6 ls8 wsd">TCP/IP,HTTP,(D)C<span class="_ _0"></span>OM<span class="_ _3"></span><span class="ff2 lsa ws10">构建出强大的通讯能力</span><span class="ls0 ws0">.<span class="_ _3"></span><span class="ff2">从<span class="_ _3"></span></span></span>Delphi6<span class="_ _3"></span><span class="ff2 lsa ws10">开始改名为</span>DataSnap,<span class="ff2 lsb ws11">直到<span class="_ _3"></span></span>D2007<span class="_ _3"></span><span class="ff2 lsa ws10">这个框架一直在使</span></span></div><div class="t m0 x5 hd y18 ff2 fs7 fc0 sc0 ls0 ws0">用<span class="_ _3"></span><span class="ff6 ls8 wsd">.D2009</span><span class="lsb ws11">重新架构了<span class="ff6 ls8 wsd">DataSnap</span></span><span class="ff6">—<span class="_ _3"></span></span><span class="lsc ws12">移除<span class="ff6 ls8 wsd">COM<span class="_ _3"></span></span><span class="lsb ws11">依赖</span></span><span class="ff6">,<span class="_ _3"></span></span><span class="lsb ws11">使用<span class="ff6 ls8 wsd">TCP/IP</span>以更轻量级的方式生成远程服务对象和客户端连接</span></div><div class="t m0 x5 hd y19 ff2 fs7 fc0 sc0 ls0 ws0">能力<span class="ff6">.</span>同时提供了与<span class="ff6 ls8">Delphi Prism2009<span class="_ _0"></span><span class="ff2 ls0">开发的<span class="ff6 ls8 wsd">.NET</span>程序通讯的功能<span class="ff6">. </span></span></span></div><div class="t m0 x8 he y1a ff6 fs3 fc0 sc0 ls0 ws0">Delphi2010<span class="ff2">中构建于</span>D2009<span class="ff2">架构之上</span>,<span class="ff2">并对此架构做了进一步的扩展</span>,<span class="ff2">包括使用两个向导来创建新的</span></div><div class="t m0 x5 he y1b ff2 fs3 fc0 sc0 ls0 ws0">部署目标<span class="ff6">(VCL</span>窗体<span class="ff6">,Window</span>服务<span class="ff6">,</span>控制台及面向<span class="ff6">Web</span>的<span class="ff6">ISAPI,CGI</span>或<span class="ff6">Web App Debugger).HTTP(S)</span>传输协</div><div class="t m0 x5 he y1c ff2 fs3 fc0 sc0 ls0 ws0">议<span class="ff6">,HTTP</span>验证<span class="ff6">,</span>客户端回调函数<span class="ff6">,REST</span>和<span class="ff6">JSON</span>的支持<span class="ff6">,</span>及使用过滤器来支持压缩和解压缩<span class="ff6">. </span></div><div class="t m0 x8 h3 y1d ff6 fs1 fc0 sc3 lsd ws0">1.1 DATASNA<span class="ls0">P<span class="ff2 ls1 ws2">范例数据位置</span> </span></div><div class="t m0 x8 he y1e ff2 fs3 fc0 sc0 ls0 ws0">本白页中我建议您使用<span class="ff6">Demo</span>和范例来学习<span class="ff6">.</span>虽然<span class="ff6">Delphi</span>支持很多数据库系统<span class="ff6">,</span>使用<span class="ff6">DBX4,ADO dbGo,</span>或</div><div class="t m0 x5 he y1f ff2 fs3 fc0 sc0 ls0 ws0">其他数据存取技术，为了演示方便我这里使用<span class="ff6">DBX4</span>来操作<span class="ff6">BlackfishSQL</span>的<span class="ff6">employee.jds</span>数据库<span class="ff6">.</span>见</div><div class="t m0 x5 hf y20 ff6 fs3 fc0 sc0 ls0 ws0">[<span class="ff3"> </span>C:\Documents and Settings\All Users\Documents\RAD </div><div class="t m0 x5 he y21 ff6 fs3 fc0 sc0 ls0 ws0">Studio\7.0\Demos\database\databases\BlackfishSQL\employee.jds].<span class="ff2">在截图中可以看到我使用的</span></div><div class="t m0 x5 he y22 ff2 fs3 fc0 sc0 ls0 ws0">是<span class="ff6">Windows Vista</span>或<span class="ff6">Win7</span>操作系统<span class="ff6">,</span>使用<span class="ff6 wsb">Windows Server 2008 Web</span>编辑器来部署<span class="ff6 wsb">DataSnap ISAPI</span>服务<span class="ff6">. </span></div><div class="t m0 x5 hc y23 ff6 fs4 fc5 sc2 ls6 ws0">2. DATASNAP<span class="ff2 wsb">目标</span><span class="ls0">:</span><span class="ff2 wsb">如何获取数据</span><span class="ls0"> </span></div><div class="t m0 x9 he y24 ff6 fs3 fc0 sc0 ls0 ws0">DataSnap2010<span class="ff2">支持三种不同的</span>Windows<span class="ff2">方式</span>:VCL<span class="ff2">窗体</span>,Windows<span class="ff2">服务和控制台应用程序</span>.<span class="ff2">本节中我们</span></div><div class="t m0 x5 he y25 ff2 fs3 fc0 sc0 ls0 ws0">将讨论他们的好处<span class="ff6">,</span>不同和每种方式最适合在什么情况下使用<span class="ff6">. </span></div><div class="t m0 x5 he y26 ff6 fs3 fc0 sc0 ls0 ws0"> <span class="ff2">下面会创建一个</span>DataSnap<span class="ff2">服务端和客户端</span>,<span class="ff2">我们将讲解</span></div><div class="t m0 x5 he y27 ff6 fs3 fc0 sc0 ls0 ws0">TDSServer,TDSServerClass,TDSTCPServerTransport,TDSHTTPService,TDSHTTPWebDispatcher<span class="ff2">和</span></div><div class="t m0 x5 he y28 ff6 fs3 fc0 sc0 ls0 ws0">TDSHTTPServiceAuthenticationManager<span class="ff2">组件，以及自定义的服务方法和</span>TDSServerModule<span class="ff2">类</span>. </div><div class="t m0 x5 he y29 ff6 fs3 fc0 sc0 ls0 ws0"> <span class="ff2">将讨论不同的传输协议</span>(TCP,HTTP)<span class="ff2">的好处及传输效率</span>.<span class="ff2">并讨论</span>DataSnap<span class="ff2">服务对象的不同生命期选项</span></div><div class="t m0 x5 he y2a ff6 fs3 fc0 sc0 ls0 ws0">(Server,Session,Invocation),<span class="ff2">及他们的效率和使用的建议</span>.<span class="ff2">最后</span>,<span class="ff2">讨论部署</span>. </div><div class="t m0 x5 h3 y2b ff6 fs1 fc0 sc3 lsd ws2">2.1. DATASNAP <span class="ff2 ls1">服务端范例</span><span class="ls0 ws0"> </span></div><div class="t m0 x5 he y2c ff6 fs3 fc0 sc0 ls0 ws0"> <span class="ff2">在</span>Object Repository<span class="ff2">中有两个不同的</span>DataSnap<span class="ff2">服务向导</span>:<span class="ff2">一个是生成基于</span>Windows<span class="ff2">的</span>Datasnap<span class="ff2">服务</span></div><div class="t m0 x5 he y2d ff2 fs3 fc0 sc0 ls0 ws0">项目<span class="ff6">,</span>一个是生成基于<span class="ff6">WebBroker</span>的<span class="ff6">DataSnap</span>服务项目<span class="ff6">(</span>需要部署到<span class="ff6">IIS</span>或<span class="ff6">Apache).</span>我们将会演示<span class="ff6">. </span></div><div class="t m0 x5 he y2e ff6 fs3 fc0 sc0 ls0 ws0"> <span class="ff2">启动了</span>Delphi2010,<span class="ff2">点击</span>File<span class="ff8"></span>New<span class="ff8"></span>Other,<span class="ff2">你会在</span>Object Repository<span class="ff2">中看到</span>DataSnap<span class="ff2">服务向导中</span></div><div class="t m0 x5 he y2f ff2 fs3 fc0 sc0 ls0 ws0">显示的三个图标<span class="ff6">:DataSnap Server,DataSnap WebBroker Server,</span>和<span class="ff6">Server Module. </span></div></div><div class="pi" data-data='{"ctm":[1.565817,0.000000,0.000000,1.565817,0.000000,0.000000]}'></div></div>

<div id="pf3" class="pf w0 h0" data-page-no="3"><div class="pc pc3 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6247721c62b5053d3caf8dc3/bg3.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0"><span class="fc4 sc0"> </span></div><div class="t m0 x2 h3 y2 ff1 fs1 fc1 sc0 ls0 ws1">Delphi 2010 Dat<span class="_ _0"></span>aSnap<span class="_ _1"> </span><span class="ff2 ls1 ws2">白页</span><span class="ws3"> <span class="ff2 ws0">逆水寒翻译</span> <span class="ws0">QQ:893444516 </span></span></div><div class="t m0 x3 h4 y3 ff1 fs2 fc0 sc0 ls2 ws4">2010<span class="ls0 ws0">-</span>03<span class="ls0 ws0">-</span>31<span class="ls0 ws0"> </span>15:45<span class="_ _0"></span><span class="ls0 ws0"> </span></div><div class="t m0 xa hf y30 ff6 fs3 fc0 sc0 ls0 ws0"> </div><div class="t m0 x5 he y31 ff2 fs3 fc0 sc0 ls0 ws0">双击第一个<span class="ff6">(</span>后面的两个在下面的小结中讲解<span class="ff6">),</span>弹出如下对话框<span class="ff6">: </span></div><div class="t m0 xb hf y32 ff6 fs3 fc0 sc0 ls0 ws0"> </div><div class="t m0 x9 he y33 ff2 fs3 fc0 sc0 ls0 ws0">界面中第一部分是控制项目类型的<span class="ff6">.</span>默认可以生成可视化的带有主窗体的<span class="ff6">VCL</span>窗体应用程序<span class="ff6">.</span>第二个</div><div class="t m0 x5 he y34 ff2 fs3 fc0 sc0 ls0 ws0">选项是创建控制台应用程序<span class="ff6">,</span>生成一个控制台窗口<span class="ff6">—</span>可以用来输出请求应答信息<span class="ff6">(</span>用<span class="ff6">Writeln</span>语句输出</div><div class="t m0 x5 he y35 ff2 fs3 fc0 sc0 ls0 ws0">服务应用程序正在做什么<span class="ff6">).</span>这两种方式都是为了做范例或最初部署<span class="ff6">,</span>很少用于最终部署<span class="ff6">.</span>由于</div><div class="t m0 x5 he y36 ff6 fs3 fc0 sc0 ls0 ws0">DataSnap<span class="ff2">架构不再基于</span>COM,<span class="ff2">客户端将不能使服务端启动</span>.<span class="ff2">因此为了响应客户端的请求</span>,DataSnap<span class="ff2">服务</span></div><div class="t m0 x5 he y37 ff2 fs3 fc0 sc0 ls0 ws0">端应该一直在运行<span class="ff6">.</span>如果你希望应用<span class="ff6">7X24</span>小时全天候运行<span class="ff6">,DataSnap</span>服务端必须同时也在运行中<span class="ff6">.</span>对应</div><div class="t m0 x5 he y38 ff6 fs3 fc0 sc0 ls0 ws0">VCL<span class="ff2">窗体或控制台应用程序</span>,<span class="ff2">需要一个账户登录到</span>Windows<span class="ff2">中后才能启动</span>DataSnap<span class="ff2">服务</span>,<span class="ff2">背离了这种要</span></div></div><div class="pi" data-data='{"ctm":[1.565817,0.000000,0.000000,1.565817,0.000000,0.000000]}'></div></div>

<div id="pf4" class="pf w0 h0" data-page-no="4"><div class="pc pc4 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6247721c62b5053d3caf8dc3/bg4.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0"><span class="fc4 sc0"> </span></div><div class="t m0 x2 h3 y2 ff1 fs1 fc1 sc0 ls0 ws1">Delphi 2010 Dat<span class="_ _0"></span>aSnap<span class="_ _1"> </span><span class="ff2 ls1 ws2">白页</span><span class="ws3"> <span class="ff2 ws0">逆水寒翻译</span> <span class="ws0">QQ:893444516 </span></span></div><div class="t m0 x3 h4 y3 ff1 fs2 fc0 sc0 ls2 ws4">2010<span class="ls0 ws0">-</span>03<span class="ls0 ws0">-</span>31<span class="ls0 ws0"> </span>15:45<span class="_ _0"></span><span class="ls0 ws0"> </span></div><div class="t m0 x5 he y39 ff2 fs3 fc0 sc0 ls0 ws0">求<span class="ff6">.</span>第三者选择在这时最适合<span class="ff6">:</span>一个<span class="ff6">Windows</span>服务应用程序<span class="ff6">,</span>安装后配置成为自动启动<span class="ff6">,</span>当计算机启动后</div><div class="t m0 x5 he y3a ff2 fs3 fc0 sc0 ls0 ws0">将自动运行<span class="ff6">(</span>不需要账户登录<span class="ff6">).</span>服务应用程序不会弹出界面<span class="ff6">,</span>很难调试<span class="ff6">Bug.</span>然而<span class="ff6">,</span>为了整合这三种的优</div><div class="t m0 x5 he y3b ff2 fs3 fc0 sc0 ls0 ws0">势<span class="ff6">,</span>我将用几分钟创建一个项目组<span class="ff6">,</span>包括<span class="ff6">VCL</span>窗体应用程序的<span class="ff6">DataSnap</span>服务<span class="ff6">,</span>控制台<span class="ff6">DataSnap</span>服务<span class="ff6">,</span>及</div><div class="t m0 x5 he y3c ff6 fs3 fc0 sc0 ls0 ws0">Windows<span class="ff2">服务</span>Datasnap<span class="ff2">服务</span>,<span class="ff2">都共享同一个自定义的服务方法</span>,<span class="ff2">这样就可以开发一个</span>Datasnap<span class="ff2">服务应用</span></div><div class="t m0 x5 he y3d ff2 fs3 fc0 sc0 ls0 ws0">程序<span class="ff6">,</span>在需要的时候编译出三个不同类型的部署方式<span class="ff6">. </span></div><div class="t m0 x5 he y3e ff6 fs3 fc0 sc0 ls0 ws0"> <span class="ff2">第二部分是选择使用的</span>Datasnap<span class="ff2">服务的通讯协议</span>.<span class="ff2">和</span>DanaSnap2009<span class="ff2">相比</span>,<span class="ff2">我们可以看到多了一个</span></div><div class="t m0 x5 he y3f ff6 fs3 fc0 sc0 ls0 ws0">HTTP<span class="ff2">通讯</span>,<span class="ff2">及</span>HTTP<span class="ff2">验证</span>.<span class="ff2">为了更加灵活</span>,<span class="ff2">这里建议选择全部选项</span>,<span class="ff2">我们可以同时使用</span>TCP/IP,HTTP,<span class="ff2">及使</span></div><div class="t m0 x5 he y40 ff2 fs3 fc0 sc0 ls0 ws0">用<span class="ff6">HTTP</span>引入的<span class="ff6">HTTP</span>验证<span class="ff6">. </span></div><div class="t m0 x5 he y41 ff6 fs3 fc0 sc0 ls0 ws0"> <span class="ff2">第三部分已经为我们配置好了</span>,<span class="ff2">如果我们要提供一个服务方法类</span>,<span class="ff2">我们可以选择它的基</span></div><div class="t m0 x5 he y42 ff2 fs3 fc0 sc0 ls0 ws0">类<span class="ff6">:TPersistent,TDataModule</span>或<span class="ff6">TDSServerModule.</span>推荐使用最后的一个选项<span class="ff6">,</span>可使用<span class="ff6">RTTI</span>来启动执行</div><div class="t m0 x5 he y43 ff2 fs3 fc0 sc0 ls0 ws0">函数<span class="ff6"> (</span>也可能你觉得使用<span class="ff6">TDataModule</span>更合适<span class="ff6">—</span>不操作数据库<span class="ff6">,</span>或不使用其他非可视控件<span class="ff6">,</span>这时使用</div><div class="t m0 x5 he y44 ff6 fs3 fc0 sc0 ls0 ws0">TPersitent<span class="ff2">也够用了</span>). </div><div class="t m0 x5 he y45 ff6 fs3 fc0 sc0 ls0 ws0"> <span class="ff2">现在是从</span>DSServer.pas<span class="ff2">中贴出来的一小段代码</span>,<span class="ff2">来说明</span>TDSServerModule<span class="ff2">和</span></div><div class="t m0 x5 he y46 ff6 fs3 fc0 sc0 ls0 ws0">TProviderDataModule(<span class="ff2">也是继承于</span>TDataModule)<span class="ff2">之间的关系</span>. </div><div class="t m0 x8 hf y47 ff6 fs3 fc0 sc0 ls0 ws0">TDSServerModuleBase = class(TProviderDataModule) </div><div class="t m0 x8 hf y48 ff6 fs3 fc0 sc0 ls0 ws0">public </div><div class="t m0 x8 hf y49 ff6 fs3 fc0 sc0 ls0 ws0">procedure BeforeDestruction; override; </div><div class="t m0 x8 hf y4a ff6 fs3 fc0 sc0 ls0 ws0">destructor Destroy; override; </div><div class="t m0 x8 hf y4b ff6 fs3 fc0 sc0 ls0 ws0">end; </div><div class="t m0 x8 hf y4c ff6 fs3 fc0 sc0 ls0 ws0">{$MethodInfo ON} </div><div class="t m0 x8 hf y31 ff6 fs3 fc0 sc0 ls0 ws0">TDSServerModule = class(TDSServerModuleBase) </div><div class="t m0 x8 hf y4d ff6 fs3 fc0 sc0 ls0 ws0">end; </div><div class="t m0 x8 hf y4e ff6 fs3 fc0 sc0 ls0 ws0">{$MethodInfo OFF} </div><div class="t m0 x5 he y4f ff2 fs3 fc0 sc0 ls0 ws0">当无法确定时就使用<span class="ff6">TDSServerModule</span>选项作为基类<span class="ff6">. </span></div><div class="t m0 x5 h10 y50 ff5 fs8 fc0 sc0 lse ws13">2.1.1. <span class="_ _6"> </span><span class="ff4 sc3 ls0 ws0">创建多目标项目组</span>--<span class="fs3 ls0 ws0"> </span><span class="lsf ws14">VCL <span class="_ _6"> </span><span class="ff4 sc3 ls0 ws0">窗体项目<span class="ff5 fs3 sc0"> </span></span></span></div><div class="t m0 x5 he y51 ff6 fs3 fc0 sc0 ls0 ws0"> <span class="ff2">如上面所说</span>,<span class="ff2">这里创建多目标的</span>Datasnap<span class="ff2">服务项目组</span>.<span class="ff2">首先创建一个</span>VCL<span class="ff2">窗体应用程序作为</span>Datasnap</div><div class="t m0 x5 he y52 ff2 fs3 fc0 sc0 ls0 ws0">服务<span class="ff6">,</span>选择所有的通讯协议<span class="ff6">. </span></div><div class="t m0 xb hf y53 ff6 fs3 fc0 sc0 ls0 ws0"> </div></div><div class="pi" data-data='{"ctm":[1.565817,0.000000,0.000000,1.565817,0.000000,0.000000]}'></div></div>

<div id="pf5" class="pf w0 h0" data-page-no="5"><div class="pc pc5 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6247721c62b5053d3caf8dc3/bg5.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0"><span class="fc4 sc0"> </span></div><div class="t m0 x2 h3 y2 ff1 fs1 fc1 sc0 ls0 ws1">Delphi 2010 Dat<span class="_ _0"></span>aSnap<span class="_ _1"> </span><span class="ff2 ls1 ws2">白页</span><span class="ws3"> <span class="ff2 ws0">逆水寒翻译</span> <span class="ws0">QQ:893444516 </span></span></div><div class="t m0 x3 h4 y3 ff1 fs2 fc0 sc0 ls2 ws4">2010<span class="ls0 ws0">-</span>03<span class="ls0 ws0">-</span>31<span class="ls0 ws0"> </span>15:45<span class="_ _0"></span><span class="ls0 ws0"> </span></div><div class="t m0 x5 he y39 ff3 fs7 fc0 sc0 ls0 ws0"> <span class="_ _5"> </span> <span class="_ _5"> </span><span class="ff2 fs3">默认创建了一个叫做<span class="ff6">Project1.dproj</span>的项目<span class="ff6">,</span>并带有三个单元文</span></div><div class="t m0 x5 he y3a ff2 fs3 fc0 sc0 ls0 ws0">件<span class="ff6">,ServerContainerUnit1.pas,ServerMethodUnit1.pas</span>和<span class="ff6">Unit1.pas.</span>首先<span class="ff6">File<span class="ff8"></span>Save Project As</span>保</div><div class="t m0 x5 he y3b ff2 fs3 fc0 sc0 ls0 ws0">存项目<span class="ff6">,</span>并输入有实际意义的文件名称<span class="ff6">.</span>将<span class="ff6">Unit1.pas</span>保存为<span class="ff6">MainForm.pas,ServerMethodsUnit1.pas</span></div><div class="t m0 x5 he y3c ff2 fs3 fc0 sc0 ls0 ws0">保存为<span class="ff6">ServerMethodsUnitDemo.pas</span>文件<span class="ff6">,</span>保存<span class="ff6">Project1.dproj</span>为<span class="ff6">DataSnapServer.dproj. </span></div><div class="t m0 x5 he y3d ff6 fs3 fc0 sc0 ls0 ws0"> <span class="ff2">稍后我们将向项目组添加控制台应用程序和</span>Window<span class="ff2">服务应用程序</span>.<span class="ff2">首先我们来检查一下项目</span>,<span class="ff2">并编</span></div><div class="t m0 x5 he y3e ff2 fs3 fc0 sc0 ls0 ws0">译工程<span class="ff6">.</span>如果你编译<span class="ff6">DataSnapServer</span>项目<span class="ff6">,</span>将会出现一个错误信息<span class="ff6">(</span>由于我们将</div><div class="t m0 x5 he y3f ff6 fs3 fc0 sc0 ls0 ws0">ServerMethodsUnit1.pas<span class="ff2">改名所致</span>).<span class="ff2">错误原因是由于</span>ServerContainerUnitDemo.pas<span class="ff2">单元中的</span></div><div class="t m0 x5 he y40 ff6 fs3 fc0 sc0 ls0 ws0">Implementation<span class="ff2">部分引用了</span>ServerMethodsUnit1.pas<span class="ff2">单元</span>.<span class="ff2">为了修复这个冲突</span>,<span class="ff2">修改引用单元的文件</span></div><div class="t m0 x5 he y41 ff2 fs3 fc0 sc0 ls0 ws0">名称<span class="ff6">,</span>从新编译<span class="ff6">.</span>这是发现在第<span class="ff6">37</span>行出现错误<span class="ff6">,</span>使用了<span class="ff6">ServerMethodsUnit1</span>中的<span class="ff6">TServerMethods1</span>类型<span class="ff6">.</span></div><div class="t m0 x5 he y42 ff2 fs3 fc0 sc0 ls0 ws0">修改<span class="ff6">ServerMethodsUnit1</span>为<span class="ff6">ServerMethodsUnitDemo.</span>这时可以正确的编译项目了<span class="ff6">. </span></div><div class="t m0 x8 he y43 ff6 fs3 fc0 sc0 ls0 ws0">ServerContainerUnitDemo<span class="ff2">的引用部分应该向下面代码所示</span>: </div><div class="t m0 xc hf y44 ff6 fs3 fc0 sc0 ls0 ws0">implementation </div><div class="t m0 xc hf y45 ff6 fs3 fc0 sc0 ls0 ws0">uses </div><div class="t m0 x2 hf y46 ff6 fs3 fc0 sc0 ls0 ws0">Windows, ServerMethodsUnitDemo; </div><div class="t m0 xc hf y47 ff6 fs3 fc0 sc0 ls0 ws0">{$R *.dfm} </div><div class="t m0 xc hf y48 ff6 fs3 fc0 sc0 ls0 ws0">procedure TServerContainer1.DSServerClass1GetClass( </div><div class="t m0 x2 hf y49 ff6 fs3 fc0 sc0 ls0 ws0">DSServerClass: TDSServerClass; var PersistentClass: TPersistentClass); </div><div class="t m0 xc hf y4a ff6 fs3 fc0 sc0 ls0 ws0">begin </div><div class="t m0 x2 hf y4b ff6 fs3 fc0 sc0 ls0 ws0">PersistentClass := ServerMethodsUnitDemo.TServerMethods1; </div><div class="t m0 xc hf y4c ff6 fs3 fc0 sc0 ls0 ws0">end; </div><div class="t m0 xc hf y31 ff6 fs3 fc0 sc0 ls0 ws0">end. </div><div class="t m0 xc h10 y54 ff5 fs8 fc0 sc0 lse ws15">2.1.1.1. S<span class="fs3 ls10 ws16">ERVER</span><span class="ls0 ws0">C<span class="fs3 ls10 ws16">ONTAI<span class="_ _3"></span>NER</span>U<span class="fs3 ls10 ws16">NIT</span>D<span class="fs3 ls11 ws17">EMO<span class="_ _3"></span></span><span class="fs3"> </span></span></div><div class="t m0 xc he y55 ff6 fs3 fc0 sc0 ls0 ws0"> <span class="ff2">打开</span>ServerContainerUnitDemo<span class="ff2">单元</span>,<span class="ff2">将会看到不少于五个组件</span>:<span class="ff2">一个</span>TDSServer,<span class="ff2">一个</span></div><div class="t m0 xc he y56 ff6 fs3 fc0 sc0 ls0 ws0">TDSServerClass,<span class="ff2">一个</span>TDSTCPServerTransport(<span class="ff2">用于</span>TCP/IP<span class="ff2">通讯</span>),<span class="ff2">一个</span>TDSHTTPService(<span class="ff2">用于</span>HTTP</div><div class="t m0 xc he y57 ff2 fs3 fc0 sc0 ls0 ws0">通讯<span class="ff6">),</span>一个<span class="ff6">TDSHTTPServiceAuthenticationManager</span>组件<span class="ff6">(</span>用于<span class="ff6">HTTP</span>验证<span class="ff6">). </span></div><div class="t m0 xd hf y58 ff6 fs3 fc0 sc0 ls0 ws0"> </div><div class="t m0 xc he y59 ff2 fs3 fc0 sc0 ls0 ws0">前面两个一直会存在<span class="ff6">,</span>其他的三个则是根据选择的通讯协议生成的<span class="ff6">. </span></div><div class="t m0 xc h10 y5a ff5 fs8 fc0 sc0 ls12 ws18">2.1.1.1.<span class="_ _0"></span>1. TDSS<span class="fs2 ls2 ws4">ERV<span class="_ _0"></span>ER<span class="ls0 ws0"> </span></span></div><div class="t m0 x2 he y35 ff6 fs3 fc0 sc0 ls0 ws0">TDSServer<span class="ff2">组件只有四个属性</span>,AutoStart,HideDSAdmin,Name<span class="ff2">和</span>Tag.AutoStart<span class="ff2">属性默认设置为</span></div><div class="t m0 xc he y36 ff6 fs3 fc0 sc0 ls0 ws0">True,<span class="ff2">意味着在窗体创建后自动启动</span>DataSnap<span class="ff2">服务</span>.<span class="ff2">如果将</span>AutoStart<span class="ff2">设置为</span>False,<span class="ff2">需要手动调用</span></div><div class="t m0 xc he y37 ff6 fs3 fc0 sc0 ls0 ws0">Start<span class="ff2">方法启动服务</span>,<span class="ff2">并调用</span>Stop<span class="ff2">方法停止服务</span>.<span class="ff2">可以调用</span>Started<span class="ff2">方法验证</span>DataSnap<span class="ff2">服务是否已经</span></div><div class="t m0 xc he y38 ff2 fs3 fc0 sc0 ls0 ws0">启动<span class="ff6">. </span></div></div><div class="pi" data-data='{"ctm":[1.565817,0.000000,0.000000,1.565817,0.000000,0.000000]}'></div></div>