{"id":206064,"date":"2025-06-12T10:29:54","date_gmt":"2025-06-12T02:29:54","guid":{"rendered":"https:\/\/server.hk\/cnblog\/206064\/"},"modified":"2025-06-12T10:29:54","modified_gmt":"2025-06-12T02:29:54","slug":"%e5%bc%ba%e5%88%b6%e7%b1%bb%e5%9e%8b%e8%bd%ac%e6%8d%a2%ef%bc%9a%e5%a6%82%e4%bd%95%e5%88%a9%e7%94%a8-var-_-error-_errornil-%e6%a3%80%e6%9f%a5%e7%bb%93%e6%9e%84%e4%bd%93%e6%98%af%e5%90%a6","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/206064\/","title":{"rendered":"\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff1a\u5982\u4f55\u5229\u7528 `var _ Error = (*_Error)(nil)` \u68c0\u67e5\u7ed3\u6784\u4f53\u662f\u5426\u5b9e\u73b0\u4e86\u63a5\u53e3\uff1f"},"content":{"rendered":"<p>\u54c8\u55bd\uff01\u5927\u5bb6\u597d\uff0c\u5f88\u9ad8\u5174\u53c8\u89c1\u9762\u4e86\uff0c\u6211\u662fGOLANG\u7684\u4e00\u540d\u4f5c\u8005\uff0c\u4eca\u5929\u7531\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff1a\u5982\u4f55\u5229\u7528 `var _ Error = (*_Error)(nil)` \u68c0\u67e5\u7ed3\u6784\u4f53\u662f\u5426\u5b9e\u73b0\u4e86\u63a5\u53e3\uff1f\u300b<\/span>\uff0c\u672c\u6587\u4e3b\u8981\u4f1a\u8bb2\u5230<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u5927\u5bb6\u4e00\u8d77\u5b66\u4e60\u8fdb\u6b65\uff0c\u4e5f\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u3001\u70b9\u8d5e\u3001\u6536\u85cf\u3001\u8f6c\u53d1! \u4e0b\u9762\u5c31\u4e00\u8d77\u6765\u770b\u770b\u5427\uff01,<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241102\/17305261696725bbd938513.jpg\" class=\"aligncenter\">,<br \/>\n<strong>\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u4e0e\u63a5\u53e3\u5b9e\u73b0\u68c0\u67e5<\/strong>,\u5728\u4ee3\u7801\u4e2d\uff0c\u51fa\u73b0\u7684\u8bed\u6cd5\u7ed3\u6784\uff1a,\u8fd9\u662f\u4e00\u4e2a\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u8bed\u6cd5\uff0c\u5176\u76ee\u7684\u662f\u68c0\u67e5\u7ed3\u6784\u4f53 _error \u662f\u5426\u5b9e\u73b0\u4e86\u63a5\u53e3 error\u3002,\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u53ef\u4ee5\u901a\u8fc7\u5c06\u53d8\u91cf\u6216\u8868\u8fbe\u5f0f\u7684\u7c7b\u578b\u5f3a\u5236\u8f6c\u6362\u6210\u53e6\u4e00\u79cd\u7c7b\u578b\u6765\u4fee\u6539\u8be5\u53d8\u91cf\u6216\u8868\u8fbe\u5f0f\u7684\u7c7b\u578b\u3002\u7136\u800c\uff0c\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u4e0d\u6d89\u53ca\u5206\u914d\u65b0\u5185\u5b58\u6216\u590d\u5236\u503c\u3002\u4f8b\u5982\uff0c\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0cnil \u662f\u4e00\u4e2a\u7a7a\u6307\u9488\uff0c\u5373\u5176\u5730\u5740\u503c\u4e3a 0\uff0c\u5c06 nil \u5f3a\u5236\u8f6c\u6362\u6210 *_error \u4e0d\u4f1a\u6539\u53d8\u5176\u5730\u5740\u503c\u3002,\u8be5\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u8bed\u6cd5\u5e38\u7528\u4e8e\u7f16\u8bd1\u671f\u95f4\u68c0\u67e5\u63a5\u53e3\u662f\u5426\u5b9e\u73b0\u3002\u5f53\u5c06\u7ed3\u6784\u4f53\u5f3a\u5236\u8f6c\u6362\u6210\u63a5\u53e3\u65f6\uff0c\u5982\u679c\u8be5\u7ed3\u6784\u4f53\u6ca1\u6709\u5b9e\u73b0\u8be5\u63a5\u53e3\uff0c\u5219\u7f16\u8bd1\u5668\u4f1a\u5728\u7f16\u8bd1\u671f\u95f4\u62a5\u9519\u3002\u4f8b\u5982\uff1a,\u5982\u679c contextbase \u6ca1\u6709\u5b9e\u73b0 context \u63a5\u53e3\uff0c\u5219\u7f16\u8bd1\u5668\u5c06\u5728\u7f16\u8bd1\u671f\u95f4\u62a5\u544a\u9519\u8bef\u3002\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdd\u5728\u8fd0\u884c\u65f6\u4e0d\u4f1a\u53d1\u751f\u63a5\u53e3\u5b9e\u73b0\u7684\u9519\u8bef\uff0c\u4ece\u800c\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u5065\u58ee\u6027\u3002,\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff1a\u5982\u4f55\u5229\u7528 `var _ Error = (*_Error)(nil)` \u68c0\u67e5\u7ed3\u6784\u4f53\u662f\u5426\u5b9e\u73b0\u4e86\u63a5\u53e3\uff1f\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u77e5\u8bc6\u70b9\uff01,\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u4e0e\u63a5\u53e3\u5b9e\u73b0\u68c0\u67e5,\u54c8\u55bd\uff01\u5927\u5bb6\u597d\uff0c\u5f88\u9ad8\u5174\u53c8\u89c1\u9762\u4e86\uff0c\u6211\u662fGOLANG\u7684\u4e00\u540d\u4f5c\u8005\uff0c\u4eca\u5929\u7531\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff1a\u5982\u4f55\u5229\u7528 `var _ Error = (*_Error)(nil)` \u68c0\u67e5\u7ed3\u6784\u4f53\u662f\u5426\u5b9e\u73b0\u4e86\u63a5\u53e3\uff1f\u300b<\/span>\uff0c\u672c\u6587\u4e3b\u8981\u4f1a\u8bb2\u5230<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u5927\u5bb6\u4e00\u8d77\u5b66\u4e60\u8fdb\u6b65\uff0c\u4e5f\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u3001\u70b9\u8d5e\u3001\u6536\u85cf\u3001\u8f6c\u53d1! \u4e0b\u9762\u5c31\u4e00\u8d77\u6765\u770b\u770b\u5427\uff01,<br \/>\n<b><\/b> <\/p>\n<p>\u5f53\u524d\u4f4d\u7f6e\uff1a <span>&gt;<\/span>  <span>&gt;<\/span>  <span>&gt;<\/span>  <span>&gt;<\/span> <span>\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff1a\u5982\u4f55\u5229\u7528 `var _ Error = (*_Error)(nil)` \u68c0\u67e5\u7ed3\u6784\u4f53\u662f\u5426\u5b9e\u73b0\u4e86\u63a5\u53e3\uff1f<\/span><\/p>\n<h1>\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff1a\u5982\u4f55\u5229\u7528 `var _ Error = (*_Error)(nil)` \u68c0\u67e5\u7ed3\u6784\u4f53\u662f\u5426\u5b9e\u73b0\u4e86\u63a5\u53e3\uff1f<\/h1>\n<p><span>2024-11-02 13:43:04<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u54c8\u55bd\uff01\u5927\u5bb6\u597d\uff0c\u5f88\u9ad8\u5174\u53c8\u89c1\u9762\u4e86\uff0c\u6211\u662fGOLANG\u7684\u4e00\u540d\u4f5c\u8005\uff0c\u4eca\u5929\u7531\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff1a\u5982\u4f55\u5229\u7528 `var _ Error = (*_Error)(nil)` \u68c0\u67e5\u7ed3\u6784\u4f53\u662f\u5426\u5b9e\u73b0\u4e86\u63a5\u53e3\uff1f\u300b<\/span>\uff0c\u672c\u6587\u4e3b\u8981\u4f1a\u8bb2\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u5927\u5bb6\u4e00\u8d77\u5b66\u4e60\u8fdb\u6b65\uff0c\u4e5f\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u3001\u70b9\u8d5e\u3001\u6536\u85cf\u3001\u8f6c\u53d1! \u4e0b\u9762\u5c31\u4e00\u8d77\u6765\u770b\u770b\u5427\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241102\/17305261696725bbd938513.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u4e0e\u63a5\u53e3\u5b9e\u73b0\u68c0\u67e5<\/strong><\/p>\n<p>\u5728\u4ee3\u7801\u4e2d\uff0c\u51fa\u73b0\u7684\u8bed\u6cd5\u7ed3\u6784\uff1a<\/p>\n<pre>var _ error = (*_error)(nil)<\/pre>\n<p>\u8fd9\u662f\u4e00\u4e2a\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u8bed\u6cd5\uff0c\u5176\u76ee\u7684\u662f\u68c0\u67e5\u7ed3\u6784\u4f53 _error \u662f\u5426\u5b9e\u73b0\u4e86\u63a5\u53e3 error\u3002<\/p>\n<p>\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u53ef\u4ee5\u901a\u8fc7\u5c06\u53d8\u91cf\u6216\u8868\u8fbe\u5f0f\u7684\u7c7b\u578b\u5f3a\u5236\u8f6c\u6362\u6210\u53e6\u4e00\u79cd\u7c7b\u578b\u6765\u4fee\u6539\u8be5\u53d8\u91cf\u6216\u8868\u8fbe\u5f0f\u7684\u7c7b\u578b\u3002\u7136\u800c\uff0c\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u4e0d\u6d89\u53ca\u5206\u914d\u65b0\u5185\u5b58\u6216\u590d\u5236\u503c\u3002\u4f8b\u5982\uff0c\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0cnil \u662f\u4e00\u4e2a\u7a7a\u6307\u9488\uff0c\u5373\u5176\u5730\u5740\u503c\u4e3a 0\uff0c\u5c06 nil \u5f3a\u5236\u8f6c\u6362\u6210 *_error \u4e0d\u4f1a\u6539\u53d8\u5176\u5730\u5740\u503c\u3002<\/p>\n<p>\u8be5\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u8bed\u6cd5\u5e38\u7528\u4e8e\u7f16\u8bd1\u671f\u95f4\u68c0\u67e5\u63a5\u53e3\u662f\u5426\u5b9e\u73b0\u3002\u5f53\u5c06\u7ed3\u6784\u4f53\u5f3a\u5236\u8f6c\u6362\u6210\u63a5\u53e3\u65f6\uff0c\u5982\u679c\u8be5\u7ed3\u6784\u4f53\u6ca1\u6709\u5b9e\u73b0\u8be5\u63a5\u53e3\uff0c\u5219\u7f16\u8bd1\u5668\u4f1a\u5728\u7f16\u8bd1\u671f\u95f4\u62a5\u9519\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>var _ Context = (*ContextBase)(nil)<\/pre>\n<p>\u5982\u679c contextbase \u6ca1\u6709\u5b9e\u73b0 context \u63a5\u53e3\uff0c\u5219\u7f16\u8bd1\u5668\u5c06\u5728\u7f16\u8bd1\u671f\u95f4\u62a5\u544a\u9519\u8bef\u3002\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdd\u5728\u8fd0\u884c\u65f6\u4e0d\u4f1a\u53d1\u751f\u63a5\u53e3\u5b9e\u73b0\u7684\u9519\u8bef\uff0c\u4ece\u800c\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u5065\u58ee\u6027\u3002<\/p>\n<p>\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff1a\u5982\u4f55\u5229\u7528 `var _ Error = (*_Error)(nil)` \u68c0\u67e5\u7ed3\u6784\u4f53\u662f\u5426\u5b9e\u73b0\u4e86\u63a5\u53e3\uff1f\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<dd>\n   \u5982\u4f55\u4f7f\u7528 SQL \u67e5\u8be2\u6307\u5b9a\u65e5\u671f\u8303\u56f4\u5185\u7684\u8bc4\u8bba\u6570\u636e\uff1f\n <\/dd>\n<\/dl>\n<dl>\n<dt>\n <\/dt>\n<dd>\n   \u4e3a\u4ec0\u4e48\u6211\u7684\u5192\u6ce1\u6392\u5e8f\u4ee3\u7801\u63d0\u793a\u6ca1\u6709 concat \u65b9\u6cd5\uff1f\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u54c8\u55bd\uff01\u5927\u5bb6\u597d\uff0c\u5f88\u9ad8\u5174\u53c8\u89c1\u9762\u4e86\uff0c\u6211&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-206064","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206064","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=206064"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206064\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=206064"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=206064"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=206064"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}