{"id":2178,"date":"2015-03-21T16:34:54","date_gmt":"2015-03-21T08:34:54","guid":{"rendered":"http:\/\/blog.qdac.cc\/?p=2178"},"modified":"2015-03-21T16:37:19","modified_gmt":"2015-03-21T08:37:19","slug":"qdataset-%e5%af%bc%e5%85%a5%e4%b8%8e%e5%af%bc%e5%87%ba%e6%95%b0%e6%8d%ae","status":"publish","type":"post","link":"https:\/\/blog.qdac.cc\/?p=2178","title":{"rendered":"QDataSet &#8211; \u5bfc\u5165\u4e0e\u5bfc\u51fa\u6570\u636e"},"content":{"rendered":"<p>QDataSet \u7684\u5bfc\u5165\u4e0e\u5bfc\u51fa\u6570\u636e\u529f\u80fd\u7ec8\u4e8e\u5f00\u5de5\u4e86\uff01\u901a\u8fc7\u5b83\uff0c\u4f60\u53ef\u4ee5\u5c06\u6570\u636e\u4fdd\u5b58\u5230\u6d41\u6216\u8005\u6587\u4ef6\u4e2d\uff0c\u4e5f\u53ef\u4ee5\u4ece\u6587\u4ef6\u6216\u6d41\u4e2d\u52a0\u8f7d\u6570\u636e\u3002<\/p>\n<p>QDataSet \u5c06\u6570\u636e\u4fdd\u5b58\u5230\u6d41\u7684\u51fd\u6570 SaveToStream \uff0c\u4fdd\u5b58\u5230\u6587\u4ef6\u7684\u51fd\u6570\u4e3a SaveToFile\uff0c\u6211\u4eec\u770b\u4e00\u4e0b\u5b83\u4eec\u58f0\u660e\uff1a<\/p>\n<pre class=\"lang:delphi decode:true\">procedure SaveToStream(AStream: TStream; AConverter: TQConverter); overload;\r\nprocedure SaveToStream(AStream: TStream; AConverterClass: TQConverterClass;AExports: TQExportRanges); overload;\r\nprocedure SaveToFile(const AFileName: QStringW;AConverter: TQConverter); overload;\r\nprocedure SaveToFile(const AFileName: QStringW;AConverterClass: TQConverterClass; AExports: TQExportRanges); overload;<\/pre>\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0cSaveToStream \u51fd\u6570\u8981\u6c42\u63d0\u4f9b\u4e00\u4e2aTQConverter \u7684\u8f6c\u6362\u5668\u5b9e\u4f8b AConverter \u6216\u8005 TQConverterClass \u7c7b\u578b\u7684\u53c2\u6570\uff0c\u5b83\u51b3\u5b9a\u4e86QDataSet \u4ee5\u4ec0\u4e48\u683c\u5f0f\u6765\u5b58\u8d2e\u6570\u636e\u3002\u53e6\u5916\u4e00\u4e2a\u53c2\u6570 AExports \u53c2\u6570\u7528\u4e8e\u51b3\u5b9a\u4f60\u8981\u4fdd\u5b58\u5230\u6d41\u4e2d\u7684\u6570\u636e\u8303\u56f4\uff0c\u5b83\u662f\u4ee5\u4e0b\u503c\u7684\u4e00\u4e2a\u96c6\u5408\uff1a<\/p>\n<ul>\n<li>merMeta<\/li>\n<\/ul>\n<p>\u5bfc\u51fa\u65f6\u5305\u542b\u5143\u6570\u636e\u4fe1\u606f\uff0c\u5982\u5b57\u6bb5\u7684\u5b9a\u4e49\u7b49\u5185\u5bb9\u3002\u4e0d\u540c\u7684\u8f6c\u6362\u5668\u5bf9\u5143\u6570\u636e\u7684\u652f\u6301\u7ea7\u522b\u4e0d\u4e00\u6837\uff0c\u8fd9\u4e2a\u9700\u8981\u5bf9\u76f8\u5e94\u7684\u8f6c\u6362\u5668\u683c\u5f0f\u8fdb\u884c\u76f8\u5e94\u7684\u4e86\u89e3\u3002<\/p>\n<ul>\n<li>merUnmodified<\/li>\n<\/ul>\n<p>\u5bfc\u51fa\u65f6\u5305\u542b\u672a\u4fee\u6539\u7684\u6570\u636e\u5185\u5bb9\u3002<\/p>\n<ul>\n<li>merInserted<\/li>\n<\/ul>\n<p>\u5bfc\u51fa\u65f6\u5305\u542b\u65b0\u63d2\u5165\u7684\u6570\u636e\u5185\u5bb9\u3002<\/p>\n<ul>\n<li>merModified<\/li>\n<\/ul>\n<p>\u5bfc\u51fa\u65f6\u5305\u542b\u4fee\u6539\u7684\u8bb0\u5f55\u5185\u5bb9<\/p>\n<ul>\n<li>merDeleted<\/li>\n<\/ul>\n<p>QDB \u9884\u5b9a\u4e49\u4e86\u51e0\u4e2a\u7ec4\u5408\uff0c\u65b9\u4fbf\u5927\u5bb6\u4f7f\u7528\uff0c\u5b83\u4eec\u662f\uff1a<\/p>\n<pre class=\"lang:delphi decode:true\">merChanges=[merMeta, merInserted, merModified,merDeleted];\r\nmerChangesData=[merInserted, merModified,merDeleted];\r\nmerAll=[merMeta, merUnmodified, merInserted, merModified,merDeleted];<\/pre>\n<ul>\n<li>merChanges \u5bf9\u5e94\u4e8e\u53d8\u66f4\u5185\u5bb9\u7684\u5143\u6570\u636e\u53ca\u53d8\u66f4\uff08\u589e\u5220\u6539\uff09\u7684\u6570\u636e\u5185\u5bb9<\/li>\n<li>merChangesData \u53ea\u5305\u542b\u53d8\u66f4\u7684\u6570\u636e\uff0c\u800c\u4e0d\u5305\u542b\u5143\u6570\u636e\u4fe1\u606f<\/li>\n<li>merAll \u5219\u5bf9\u5e94\u4e8e\u5168\u90e8\u6570\u636e\u53ca\u5143\u6570\u636e\u4fe1\u606f<\/li>\n<\/ul>\n<p>\u4e0b\u9762\u7684\u4ee3\u7801\u662f\u4e00\u4e2a\u8bbe\u7f6e\u5bfc\u51fa\u6570\u636e\u5185\u5bb9\u8303\u56f4\u7684\u4f8b\u5b50\uff08AConverter \u4e3a\u4e00\u4e2a TQConverter \u7c7b\u578b\u7684\u5b9e\u4f8b\uff09\uff1a<\/p>\n<pre class=\"lang:delphi decode:true \">AConverter.ExportRanges := merAll;\r\nFDataSet.SaveToFile(AFileName, AConverter);<\/pre>\n<p>\u5173\u4e8e\u8f6c\u6362\u5668\uff0cqconverter_stds \u63d0\u4f9b\u9ed8\u8ba4\u7684\u6807\u51c6\u8f6c\u6362\u5668\uff0c\u5305\u62ec MessagePack \u548c Json \u683c\u5f0f\u7684\u6253\u5305\u5c01\u88c5\uff0c\u5206\u522b\u5bf9\u5e94\u4e8e TQMsgPackConverter \u548c TQJsonConverter\u3002\u5173\u4e8e\u5982\u4f55\u4ece TQConverter \u7ee7\u627f\u4e0b\u6765\u65b0\u7684\u8f6c\u6362\u5668\uff0c\u6211\u4f1a\u5728\u5355\u72ec\u7684\u6587\u7ae0\u91cc\u4e88\u4ee5\u8bf4\u660e\uff0c\u8fd9\u91cc\u6211\u4eec\u8bf4\u8bf4\u5176\u7528\u6cd5\u3002<\/p>\n<p>\u6211\u4eec\u5728\u5c06\u6570\u636e\u4fdd\u5b58\u5230\u6d41\u91cc\u65f6\uff0c\u5404\u79cd\u8f6c\u6362\u5668\u90fd\u662f\u660e\u7801\u4fdd\u5b58\u7684\uff0c\u8fd9\u5728\u4f20\u8f93\u65f6\u53ef\u80fd\u4e0d\u5b89\u5168\uff0c\u6240\u4ee5 TQConverter \u9700\u8981\u548c TQStreamProcessor \u914d\u5408\uff0c\u5bf9\u7f16\u7801\u540e\u7684\u6570\u636e\u6d41\u8fdb\u884c\u4e8c\u6b21\u5904\u7406\u3002\u800c\u8fd9\u4e9b\u5904\u7406\u8fc7\u7a0b\u662f\u5982\u6b64\u7684\u7b80\u5355\uff0c\u53ea\u9700\u8981\u5c06 TQConverter \u7684\u4e3aProcessors \u6dfb\u52a0\u76f8\u5e94\u7684\u5904\u7406\u5668\u5c31\u53ef\u4ee5\u3002QDB \u9ed8\u8ba4\u4e3a\u60a8\u63d0\u4f9b\u4e86 TQZLibStreamProcessor \u7528\u4e8e\u538b\u7f29\u6570\u636e\uff08 qsp_zlib.pas \u5355\u5143\uff09\uff0c\u4ee5\u53caTQAESStreamProcessor \u7528\u4e8e\u52a0\u5bc6\u6570\u636e\uff08 qsp_aes.pas \u5355\u5143\uff09\u3002\u5982\u679c\u540c\u65f6\u52a0\u5bc6\u5e76\u538b\u7f29\u6570\u636e\uff0c\u8fd9\u91cc\u6709\u4e00\u4e2a\u63d0\u793a\u7ed9\u5927\u5bb6\uff1a<strong>\u5e94\u5148\u6dfb\u52a0\u538b\u7f29\u5904\u7406\u5668\uff0c\u7136\u540e\u518d\u6dfb\u52a0\u52a0\u5bc6\u5904\u7406\u5668\u3002<\/strong>\u7406\u7531\u5f88\u7b80\u5355\uff0c\u52a0\u5bc6\u540e\u7684\u6570\u636e\u4e00\u822c\u662f\u4e71\u7801\uff0c\u6b64\u65f6\u53ef\u80fd\u6570\u636e\u7684\u53ef\u538b\u7f29\u6027\u4f1a\u660e\u663e\u964d\u4f4e\uff0c\u4ece\u800c\u4f7f\u5f97\u538b\u7f29\u65e0\u6cd5\u8fbe\u5230\u6ee1\u610f\u7684\u6548\u679c\u3002\u800c\u5148\u6dfb\u52a0\u538b\u7f29\u5904\u7406\u5668\uff0c\u5219\u5148\u538b\u7f29\u6570\u636e\u518d\u52a0\u5bc6\uff0c\u7531\u4e8e\u539f\u59cb\u6570\u636e\u662f\u660e\u6587\uff0c\u89c4\u5f8b\u6027\u8f83\u5f3a\uff0c\u5c31\u53ef\u4ee5\u5927\u5e45\u538b\u7f29\u4ee5\u51cf\u5c11\u751f\u6210\u7684\u7ed3\u679c\u4f53\u79ef\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre class=\"lang:delphi decode:true\">FZLibProcessor := TQZlibStreamProcssor.Create(Self);\r\nFZlibProcessor.CompressionLevel:=TZCompressionLevel(cbxCompressLevel.ItemIndex);\r\nAConverter.StreamProcessors.Add.Processor := FZLibProcessor;\r\nFAESProcessor:=TQAESStreamProcessor.Create(Self);\r\nFAESProcessor.InitVector:=edtInitVector.Text;\r\nFAESProcessor.KeyType:=TQAESKeyType(cbxKeyType.ItemIndex);\r\nFAESProcessor.Password:=edtKey.Text;\r\nFAESProcessor.EncryptMode:=emCBC;\r\nAConverter.StreamProcessors.Add.Processor:=FAESProcessor;<\/pre>\n<p>\u76ee\u524d\uff0c\u7a0b\u5e8f\u6682\u65f6\u672a\u652f\u6301\u5b89\u88c5\u7ec4\u4ef6\u5230 IDE \u7684\u7ec4\u4ef6\u9762\u677f\uff0c\u5c06\u6765\u52a0\u5165\u5b89\u88c5\u652f\u6301\u540e\uff0c\u5c31\u53ef\u4ee5\u76f4\u63a5\u62d6\u653e\u63a7\u4ef6\uff0c\u8bbe\u7f6e\u76f8\u5173\u5c5e\u6027\u4e86\uff0c\u4e5f\u5c31\u53ef\u4ee5\u4e0d\u7528\u5199\u4e00\u53e5\u4ee3\u7801\u76f4\u63a5\u8bbe\u7f6e\u597d Converter \u7684\u76f8\u5173\u5c5e\u6027\u3002<\/p>\n<p>\u8fd9\u91cc\u6709\u4e00\u70b9\u9700\u8981\u6ce8\u610f\uff0c\u6d41\u5904\u7406\u5668\u7684\u987a\u5e8f\u5728\u4fdd\u5b58\u548c\u6253\u5f00\u65f6\uff0c\u76f8\u5e94\u7684\u8f6c\u6362\u5668\u8bbe\u7f6e\u8981\u4fdd\u6301\u4e00\u81f4\u3002\u5728\u4f7f\u7528 LoadFromStream \u548c LoadFromFile \u4ece\u6d41\u4e2d\u52a0\u8f7d\u6570\u636e\u5185\u5bb9\u65f6\uff0c\u4f1a\u81ea\u52a8\u4ece\u6700\u540e\u4e00\u4e2a\u6d41\u5904\u7406\u5668\u8c03\u7528\u5230\u7b2c\u4e00\u4e2a\u5904\u7406\u5668\uff0c\u5b9e\u73b0\u4fdd\u5b58\u7684\u53cd\u8fc7\u7a0b\u3002\u6211\u4eec\u770b\u4e00\u4e0b\u51fd\u6570\u58f0\u660e\uff1a<\/p>\n<pre class=\"lang:delphi decode:true\">procedure LoadFromStream(AStream: TStream;AConverter: TQConverter); overload;\r\nprocedure LoadFromStream(AStream: TStream;AConverterClass: TQConverterClass); overload;\r\nprocedure LoadFromFile(const AFileName: QStringW;AConverter: TQConverter); overload;\r\nprocedure LoadFromFile(const AFileName: QStringW;AConverterClass: TQConverterClass); overload;<\/pre>\n<p>\u770b\u5230\u4e86\u4ec0\u4e48\uff1f\u6bd4 SaveToXXX \u5c11\u4e86\u4e00\u4e2aAExports \u53c2\u6570\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u52a0\u8f7d\u662f\u4ece\u6d41\u6216\u6587\u4ef6\u4e2d\u52a0\u8f7d\u6240\u6709\u7684\u6570\u636e\uff0c\u4e0d\u7ba1\u5b83\u5904\u4e8e\u4f55\u79cd\u72b6\u6001\u3002\u81f3\u4e8e\u8f6c\u6362\u5668\u7684\u89c4\u5219\u548c\u4e0a\u9762\u4fdd\u5b58\u65f6\u5b8c\u5168\u4e00\u6837\uff0c\u6211\u5c31\u4e0d\u518d\u8fd9\u91cc\u7f00\u8ff0\u3002<\/p>\n<pre class=\"lang:delphi decode:true \">FDataSet.LoadFromFile(AFileName, AConverter);<\/pre>\n<p>\u5982\u679c\u8981\u5c06\u6570\u636e\u63d0\u4ea4\u5230\u6570\u636e\u5e93\uff0c\u6211\u4eec\u5c06\u6765\u4f1a\u8ba8\u8bba TQDataSet \u4e0e TQProvider \uff0cTQConverter \u548c TQProvider \u4e4b\u95f4\u7684\u6570\u636e\u4ea4\u6362\uff0c\u4f46\u76ee\u524d\u8fd9\u5757\u5e76\u6ca1\u6709\u5b8c\u6210\uff0c\u6240\u4ee5\u4e5f\u5c31\u4e0d\u5728\u8ba8\u8bba\u8303\u56f4\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>QDataSet \u7684\u5bfc\u5165\u4e0e\u5bfc\u51fa\u6570\u636e\u529f\u80fd\u7ec8 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[69,8,9,66],"tags":[366,60,364,365,198],"class_list":["post-2178","post","type-post","status-publish","format-standard","hentry","category-c-builder","category-delphi","category-qdac","category-qdb","tag-delta","tag-60","tag-364","tag-365","tag-198"],"views":3886,"_links":{"self":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/2178","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2178"}],"version-history":[{"count":2,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/2178\/revisions"}],"predecessor-version":[{"id":2180,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/2178\/revisions\/2180"}],"wp:attachment":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2178"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2178"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2178"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}