{"id":60249,"date":"2024-10-13T01:17:15","date_gmt":"2024-10-12T17:17:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60249\/"},"modified":"2024-10-13T01:17:15","modified_gmt":"2024-10-12T17:17:15","slug":"datareader%e9%80%a3%e6%8e%a5%e9%97%9c%e9%96%89%e8%a7%a3%e6%83%91%e7%af%87","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60249\/","title":{"rendered":"DataReader\u9023\u63a5\u95dc\u9589\u89e3\u60d1\u7bc7"},"content":{"rendered":"<h1 id=\"datareader%e9%80%a3%e6%8e%a5%e9%97%9c%e9%96%89%e8%a7%a3%e6%83%91%e7%af%87-nFjxtMTnnA\">DataReader\u9023\u63a5\u95dc\u9589\u89e3\u60d1\u7bc7<\/h1>\n<p>\u5728\u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\u6642\uff0c<code>DataReader<\/code> \u662f\u4e00\u500b\u975e\u5e38\u91cd\u8981\u7684\u5de5\u5177\u3002\u5b83\u63d0\u4f9b\u4e86\u4e00\u7a2e\u9ad8\u6548\u7684\u65b9\u5f0f\u4f86\u8b80\u53d6\u6578\u64da\uff0c\u4f46\u5728\u4f7f\u7528\u904e\u7a0b\u4e2d\uff0c\u8a31\u591a\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u9023\u63a5\u95dc\u9589\u7684\u554f\u984c\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u4e00\u554f\u984c\u7684\u6839\u6e90\u53ca\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afdatareader%ef%bc%9f-nFjxtMTnnA\">\u4ec0\u9ebc\u662fDataReader\uff1f<\/h2>\n<p><code>DataReader<\/code> \u662f .NET Framework \u4e2d\u7684\u4e00\u500b\u985e\uff0c\u7528\u65bc\u5f9e\u6578\u64da\u5eab\u4e2d\u4ee5\u6d41\u7684\u65b9\u5f0f\u8b80\u53d6\u6578\u64da\u3002\u5b83\u7684\u4e3b\u8981\u7279\u9ede\u662f\u9ad8\u6548\u548c\u8f15\u91cf\uff0c\u9069\u5408\u7528\u65bc\u9700\u8981\u5feb\u901f\u8b80\u53d6\u5927\u91cf\u6578\u64da\u7684\u5834\u666f\u3002<code>DataReader<\/code> \u53ea\u80fd\u5411\u524d\u8b80\u53d6\u6578\u64da\uff0c\u9019\u610f\u5473\u8457\u4e00\u65e6\u8b80\u53d6\u904e\u7684\u884c\u7121\u6cd5\u518d\u56de\u5230\u4e4b\u524d\u7684\u884c\u3002<\/p>\n<h2 id=\"datareader%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e5%bc%8f-nFjxtMTnnA\">DataReader\u7684\u4f7f\u7528\u65b9\u5f0f<\/h2>\n<p>\u4f7f\u7528 <code>DataReader<\/code> \u7684\u57fa\u672c\u6b65\u9a5f\u5982\u4e0b\uff1a<\/p>\n<pre><code>\nusing (SqlConnection connection = new SqlConnection(connectionString))\n{\n    connection.Open();\n    SqlCommand command = new SqlCommand(query, connection);\n    SqlDataReader reader = command.ExecuteReader();\n\n    while (reader.Read())\n    {\n        \/\/ \u8b80\u53d6\u6578\u64da\n        var value = reader[\"ColumnName\"];\n    }\n    reader.Close();\n}\n<\/code><\/pre>\n<p>\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c<code>SqlConnection<\/code> \u7528\u65bc\u5efa\u7acb\u8207\u6578\u64da\u5eab\u7684\u9023\u63a5\uff0c<code>SqlCommand<\/code> \u7528\u65bc\u57f7\u884c\u67e5\u8a62\uff0c\u800c <code>SqlDataReader<\/code> \u5247\u7528\u65bc\u8b80\u53d6\u67e5\u8a62\u7d50\u679c\u3002<\/p>\n<h2 id=\"%e9%80%a3%e6%8e%a5%e9%97%9c%e9%96%89%e7%9a%84%e5%8e%9f%e5%9b%a0-nFjxtMTnnA\">\u9023\u63a5\u95dc\u9589\u7684\u539f\u56e0<\/h2>\n<p>\u5728\u4f7f\u7528 <code>DataReader<\/code> \u6642\uff0c\u958b\u767c\u8005\u7d93\u5e38\u6703\u9047\u5230\u9023\u63a5\u95dc\u9589\u7684\u554f\u984c\u3002\u9019\u901a\u5e38\u662f\u7531\u4ee5\u4e0b\u5e7e\u500b\u539f\u56e0\u9020\u6210\u7684\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u7bc4\u570d\u554f\u984c\uff1a<\/strong>\u5982\u679c <code>DataReader<\/code> \u7684\u4f7f\u7528\u7bc4\u570d\u8d85\u51fa\u4e86\u5176\u6240\u5c6c\u7684 <code>SqlConnection<\/code>\uff0c\u5247\u6703\u5c0e\u81f4\u9023\u63a5\u95dc\u9589\u3002\u9019\u662f\u56e0\u70ba <code>DataReader<\/code> \u9700\u8981\u5728\u5176\u6240\u5c6c\u7684\u9023\u63a5\u958b\u555f\u72c0\u614b\u4e0b\u904b\u884c\u3002<\/li>\n<li><strong>\u9023\u63a5\u6c60\u554f\u984c\uff1a<\/strong>\u5728\u9ad8\u4e26\u767c\u7684\u74b0\u5883\u4e2d\uff0c\u9023\u63a5\u6c60\u53ef\u80fd\u6703\u8017\u76e1\uff0c\u5c0e\u81f4\u7121\u6cd5\u7372\u53d6\u65b0\u7684\u9023\u63a5\uff0c\u5f9e\u800c\u51fa\u73fe\u9023\u63a5\u95dc\u9589\u7684\u60c5\u6cc1\u3002<\/li>\n<li><strong>\u7570\u5e38\u8655\u7406\uff1a<\/strong>\u5982\u679c\u5728\u8b80\u53d6\u6578\u64da\u7684\u904e\u7a0b\u4e2d\u767c\u751f\u7570\u5e38\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u9023\u63a5\u88ab\u610f\u5916\u95dc\u9589\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-nFjxtMTnnA\">\u89e3\u6c7a\u65b9\u6848<\/h2>\n<p>\u70ba\u4e86\u89e3\u6c7a <code>DataReader<\/code> \u9023\u63a5\u95dc\u9589\u7684\u554f\u984c\uff0c\u53ef\u4ee5\u8003\u616e\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u6cd5\uff1a<\/p>\n<ul>\n<li><strong>\u78ba\u4fdd\u4f7f\u7528\u7bc4\u570d\u6b63\u78ba\uff1a<\/strong>\u5728\u4f7f\u7528 <code>DataReader<\/code> \u6642\uff0c\u61c9\u78ba\u4fdd\u5176\u5728 <code>SqlConnection<\/code> \u7684\u7bc4\u570d\u5167\u904b\u884c\u3002\u53ef\u4ee5\u4f7f\u7528 <code>using<\/code> \u8a9e\u53e5\u4f86\u81ea\u52d5\u7ba1\u7406\u8cc7\u6e90\u3002<\/li>\n<li><strong>\u6aa2\u67e5\u9023\u63a5\u6c60\u8a2d\u7f6e\uff1a<\/strong>\u78ba\u4fdd\u9023\u63a5\u6c60\u7684\u5927\u5c0f\u8db3\u5920\uff0c\u4e26\u6839\u64da\u9700\u8981\u9032\u884c\u8abf\u6574\u3002<\/li>\n<li><strong>\u52a0\u5f37\u7570\u5e38\u8655\u7406\uff1a<\/strong>\u5728\u8b80\u53d6\u6578\u64da\u6642\uff0c\u61c9\u52a0\u5f37\u7570\u5e38\u8655\u7406\uff0c\u78ba\u4fdd\u5728\u767c\u751f\u7570\u5e38\u6642\u80fd\u5920\u59a5\u5584\u8655\u7406\uff0c\u907f\u514d\u9023\u63a5\u88ab\u610f\u5916\u95dc\u9589\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-nFjxtMTnnA\">\u7d50\u8ad6<\/h2>\n<p>\u5728\u4f7f\u7528 <code>DataReader<\/code> \u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\u6642\uff0c\u4e86\u89e3\u9023\u63a5\u95dc\u9589\u7684\u539f\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u901a\u904e\u6b63\u78ba\u7684\u4f7f\u7528\u7bc4\u570d\u3001\u6aa2\u67e5\u9023\u63a5\u6c60\u8a2d\u7f6e\u4ee5\u53ca\u52a0\u5f37\u7570\u5e38\u8655\u7406\uff0c\u53ef\u4ee5\u6709\u6548\u907f\u514d\u9019\u4e00\u554f\u984c\u7684\u767c\u751f\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8b80\u53d6\u7684\u61c9\u7528\u4f86\u8aaa\uff0c<code>DataReader<\/code> \u662f\u4e00\u500b\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u53ca\u5176\u4ed6\u670d\u52d9\u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22DataReader\u9023\u63a5\u95dc\u9589\u7684\u5e38\u898b\u554f\u984c\u8207\u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u6709\u6548\u7ba1\u7406\u6578\u64da\u9023\u63a5\uff0c\u63d0\u5347\u61c9\u7528\u6027\u80fd\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-60249","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60249","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=60249"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60249\/revisions"}],"predecessor-version":[{"id":60250,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60249\/revisions\/60250"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=60249"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=60249"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=60249"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}