{"id":30122,"date":"2024-03-11T14:26:51","date_gmt":"2024-03-06T21:03:17","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8golang%e7%9a%84mongodriver%e5%92%8creflect%e5%8c%85%e6%9d%a5%e8%8e%b7%e5%8f%96%e6%95%b0%e6%8d%ae%e7%9a%84%e6%96%b9%e6%b3%95%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f\/"},"modified":"2025-08-12T17:40:50","modified_gmt":"2025-08-12T09:40:50","slug":"%e4%bd%bf%e7%94%a8golang%e7%9a%84mongodriver%e5%92%8creflect%e5%8c%85%e6%9d%a5%e8%8e%b7%e5%8f%96%e6%95%b0%e6%8d%ae%e7%9a%84%e6%96%b9%e6%b3%95%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8golang%e7%9a%84mongodriver%e5%92%8creflect%e5%8c%85%e6%9d%a5%e8%8e%b7%e5%8f%96%e6%95%b0%e6%8d%ae%e7%9a%84%e6%96%b9%e6%b3%95%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f\/","title":{"rendered":"\u4f7f\u7528Golang\u7684MongoDriver\u548creflect\u5305\u6765\u83b7\u53d6\u6570\u636e\u7684\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"s\">\"context\"<\/span>\r\n    <span class=\"s\">\"fmt\"<\/span>\r\n    <span class=\"s\">\"log\"<\/span>\r\n    <span class=\"s\">\"reflect\"<\/span>\r\n    <span class=\"s\">\"time\"<\/span>\r\n\r\n    <span class=\"s\">\"go.mongodb.org\/mongo-driver\/bson\"<\/span>\r\n    <span class=\"s\">\"go.mongodb.org\/mongo-driver\/bson\/primitive\"<\/span>\r\n    <span class=\"s\">\"go.mongodb.org\/mongo-driver\/mongo\"<\/span>\r\n    <span class=\"s\">\"go.mongodb.org\/mongo-driver\/mongo\/options\"<\/span>\r\n    <span class=\"s\">\"go.mongodb.org\/mongo-driver\/mongo\/readpref\"<\/span>\r\n<span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"n\">Foo<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">ID<\/span>   <span class=\"o\">*<\/span><span class=\"n\">primitive<\/span><span class=\"o\">.<\/span><span class=\"n\">ObjectID<\/span> <span class=\"s\">`json:\"_id\" bson:\"_id,omitempty\"`<\/span>\r\n    <span class=\"n\">Name<\/span> <span class=\"kt\">string<\/span>              <span class=\"s\">`json:\"name\" bson:\"name\"`<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">ctx<\/span><span class=\"p\">,<\/span> <span class=\"n\">_<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">context<\/span><span class=\"o\">.<\/span><span class=\"n\">WithTimeout<\/span><span class=\"p\">(<\/span><span class=\"n\">context<\/span><span class=\"o\">.<\/span><span class=\"n\">Background<\/span><span class=\"p\">(),<\/span> <span class=\"m\">10<\/span><span class=\"o\">*<\/span><span class=\"n\">time<\/span><span class=\"o\">.<\/span><span class=\"n\">Second<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"n\">client<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">mongo<\/span><span class=\"o\">.<\/span><span class=\"n\">Connect<\/span><span class=\"p\">(<\/span><span class=\"n\">ctx<\/span><span class=\"p\">,<\/span> <span class=\"n\">options<\/span><span class=\"o\">.<\/span><span class=\"n\">Client<\/span><span class=\"p\">()<\/span><span class=\"o\">.<\/span><span class=\"n\">ApplyURI<\/span><span class=\"p\">(<\/span><span class=\"s\">\"mongodb:\/\/localhost:27017\"<\/span><span class=\"p\">))<\/span>\r\n    <span class=\"n\">ctx<\/span><span class=\"p\">,<\/span> <span class=\"n\">_<\/span> <span class=\"o\">=<\/span> <span class=\"n\">context<\/span><span class=\"o\">.<\/span><span class=\"n\">WithTimeout<\/span><span class=\"p\">(<\/span><span class=\"n\">context<\/span><span class=\"o\">.<\/span><span class=\"n\">Background<\/span><span class=\"p\">(),<\/span> <span class=\"m\">2<\/span><span class=\"o\">*<\/span><span class=\"n\">time<\/span><span class=\"o\">.<\/span><span class=\"n\">Second<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">=<\/span> <span class=\"n\">client<\/span><span class=\"o\">.<\/span><span class=\"n\">Ping<\/span><span class=\"p\">(<\/span><span class=\"n\">ctx<\/span><span class=\"p\">,<\/span> <span class=\"n\">readpref<\/span><span class=\"o\">.<\/span><span class=\"n\">Primary<\/span><span class=\"p\">());<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">log<\/span><span class=\"o\">.<\/span><span class=\"n\">Fatalf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"%+v<\/span><span class=\"se\">\\n<\/span><span class=\"s\">\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"n\">collection<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">client<\/span><span class=\"o\">.<\/span><span class=\"n\">Database<\/span><span class=\"p\">(<\/span><span class=\"s\">\"testing\"<\/span><span class=\"p\">)<\/span><span class=\"o\">.<\/span><span class=\"n\">Collection<\/span><span class=\"p\">(<\/span><span class=\"s\">\"foo\"<\/span><span class=\"p\">)<\/span>\r\n\r\n    <span class=\"c\">\/\/ \u3053\u3053\u307e\u3067\u30b5\u30f3\u30d7\u30eb\u3069\u304a\u308a ---------------------------------<\/span>\r\n\r\n    <span class=\"n\">fooType<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">reflect<\/span><span class=\"o\">.<\/span><span class=\"n\">TypeOf<\/span><span class=\"p\">(<\/span><span class=\"n\">Foo<\/span><span class=\"p\">{})<\/span>\r\n    <span class=\"n\">fooSlice<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">createSlice<\/span><span class=\"p\">(<\/span><span class=\"n\">reflect<\/span><span class=\"o\">.<\/span><span class=\"n\">SliceOf<\/span><span class=\"p\">(<\/span><span class=\"n\">fooType<\/span><span class=\"p\">))<\/span>\r\n\r\n    <span class=\"c\">\/\/ \u3053\u306e\u884c\u304c\u30e1\u30a4\u30f3<\/span>\r\n    <span class=\"n\">d<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">find<\/span><span class=\"p\">(<\/span><span class=\"n\">collection<\/span><span class=\"p\">,<\/span> <span class=\"n\">fooSlice<\/span><span class=\"p\">,<\/span> <span class=\"n\">fooType<\/span><span class=\"p\">)<\/span><span class=\"o\">.<\/span><span class=\"p\">([]<\/span><span class=\"n\">Foo<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">d<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c\">\/\/ \u9ed2\u9b54\u8853\u611f\u3042\u308b<\/span>\r\n<span class=\"c\">\/\/ \u5358\u7d14\u306bMakeSlice\u3060\u3051\u3060\u3068\u5230\u9054\u53ef\u80fd\u306a\u30a2\u30c9\u30ec\u30b9\u3092\u8fd4\u305b\u306a\u3044\u306e\u3067\u3001makedSlice.CanSet() == false<\/span>\r\n<span class=\"c\">\/\/ \u306a\u306e\u3067\u3001\u65b0\u3057\u304freflect.value\u3092New\u3057\u3066\u3001\u4f5c\u3063\u305fmakedSlice\u3092\u30bb\u30c3\u30c8\u3059\u308b\u5f62\u3092\u53d6\u3063\u3066\u3044\u308b\u3002<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"n\">createSlice<\/span><span class=\"p\">(<\/span><span class=\"n\">sliceType<\/span> <span class=\"n\">reflect<\/span><span class=\"o\">.<\/span><span class=\"n\">Type<\/span><span class=\"p\">)<\/span> <span class=\"n\">reflect<\/span><span class=\"o\">.<\/span><span class=\"n\">Value<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">makedSlice<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">reflect<\/span><span class=\"o\">.<\/span><span class=\"n\">MakeSlice<\/span><span class=\"p\">(<\/span><span class=\"n\">sliceType<\/span><span class=\"p\">,<\/span> <span class=\"m\">0<\/span><span class=\"p\">,<\/span> <span class=\"m\">16<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"n\">reflectionValue<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">reflect<\/span><span class=\"o\">.<\/span><span class=\"n\">New<\/span><span class=\"p\">(<\/span><span class=\"n\">makedSlice<\/span><span class=\"o\">.<\/span><span class=\"n\">Type<\/span><span class=\"p\">())<\/span>\r\n    <span class=\"n\">reflectionValue<\/span><span class=\"o\">.<\/span><span class=\"n\">Elem<\/span><span class=\"p\">()<\/span><span class=\"o\">.<\/span><span class=\"n\">Set<\/span><span class=\"p\">(<\/span><span class=\"n\">makedSlice<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"n\">slicePtr<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">reflect<\/span><span class=\"o\">.<\/span><span class=\"n\">ValueOf<\/span><span class=\"p\">(<\/span><span class=\"n\">reflectionValue<\/span><span class=\"o\">.<\/span><span class=\"n\">Interface<\/span><span class=\"p\">())<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">slicePtr<\/span><span class=\"o\">.<\/span><span class=\"n\">Elem<\/span><span class=\"p\">()<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">find<\/span><span class=\"p\">(<\/span><span class=\"n\">col<\/span> <span class=\"o\">*<\/span><span class=\"n\">mongo<\/span><span class=\"o\">.<\/span><span class=\"n\">Collection<\/span><span class=\"p\">,<\/span> <span class=\"n\">reflectSlice<\/span> <span class=\"n\">reflect<\/span><span class=\"o\">.<\/span><span class=\"n\">Value<\/span><span class=\"p\">,<\/span> <span class=\"n\">reflectType<\/span> <span class=\"n\">reflect<\/span><span class=\"o\">.<\/span><span class=\"n\">Type<\/span><span class=\"p\">)<\/span> <span class=\"k\">interface<\/span><span class=\"p\">{}<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">ctx<\/span><span class=\"p\">,<\/span> <span class=\"n\">cancel<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">context<\/span><span class=\"o\">.<\/span><span class=\"n\">WithTimeout<\/span><span class=\"p\">(<\/span><span class=\"n\">context<\/span><span class=\"o\">.<\/span><span class=\"n\">Background<\/span><span class=\"p\">(),<\/span> <span class=\"m\">2<\/span><span class=\"o\">*<\/span><span class=\"n\">time<\/span><span class=\"o\">.<\/span><span class=\"n\">Second<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">defer<\/span> <span class=\"n\">cancel<\/span><span class=\"p\">()<\/span>\r\n    <span class=\"n\">cur<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">col<\/span><span class=\"o\">.<\/span><span class=\"n\">Find<\/span><span class=\"p\">(<\/span><span class=\"n\">ctx<\/span><span class=\"p\">,<\/span> <span class=\"n\">bson<\/span><span class=\"o\">.<\/span><span class=\"n\">M<\/span><span class=\"p\">{})<\/span>\r\n    <span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">log<\/span><span class=\"o\">.<\/span><span class=\"n\">Fatalf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"%+v<\/span><span class=\"se\">\\n<\/span><span class=\"s\">\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"k\">defer<\/span> <span class=\"n\">cur<\/span><span class=\"o\">.<\/span><span class=\"n\">Close<\/span><span class=\"p\">(<\/span><span class=\"n\">ctx<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">for<\/span> <span class=\"n\">cur<\/span><span class=\"o\">.<\/span><span class=\"n\">Next<\/span><span class=\"p\">(<\/span><span class=\"n\">ctx<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">v<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">reflect<\/span><span class=\"o\">.<\/span><span class=\"n\">New<\/span><span class=\"p\">(<\/span><span class=\"n\">reflectType<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">cur<\/span><span class=\"o\">.<\/span><span class=\"n\">Decode<\/span><span class=\"p\">(<\/span><span class=\"n\">v<\/span><span class=\"o\">.<\/span><span class=\"n\">Interface<\/span><span class=\"p\">());<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"n\">log<\/span><span class=\"o\">.<\/span><span class=\"n\">Fatalf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"%+v<\/span><span class=\"se\">\\n<\/span><span class=\"s\">\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"p\">}<\/span>\r\n        <span class=\"n\">reflectSlice<\/span><span class=\"o\">.<\/span><span class=\"n\">Set<\/span><span class=\"p\">(<\/span><span class=\"n\">reflect<\/span><span class=\"o\">.<\/span><span class=\"n\">Append<\/span><span class=\"p\">(<\/span><span class=\"n\">reflectSlice<\/span><span class=\"p\">,<\/span> <span class=\"n\">v<\/span><span class=\"o\">.<\/span><span class=\"n\">Elem<\/span><span class=\"p\">()))<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">cur<\/span><span class=\"o\">.<\/span><span class=\"n\">Err<\/span><span class=\"p\">();<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">log<\/span><span class=\"o\">.<\/span><span class=\"n\">Fatalf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"%+v<\/span><span class=\"se\">\\n<\/span><span class=\"s\">\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">reflectSlice<\/span><span class=\"o\">.<\/span><span class=\"n\">Interface<\/span><span class=\"p\">()<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u4f7f\u7528Mongo\u6570\u636e\u5e93\u6216\u8005\u8fdb\u884c\u6570\u636e\u51c6\u5907\uff0c\u867d\u7136\u9700\u8981\u4e00\u4e9b\u6b65\u9aa4\uff0c\u4f46\u5982\u679c\u4f7f\u7528Golang 1.12\u4ee5\u4e0a\u7248\u672c\uff0c\u53ea\u9700\u590d\u5236\u9ecf\u8d34\u5373\u53ef\u8fd0\u884c\u3002<\/p>\n<p>\u4e0d\u8fc7\u8bdd\u8bf4\u56de\u6765\uff0cGolang\u7684\u53cd\u5c04\u771f\u7684\u5f88\u96be\u7406\u89e3\u548c\u4f7f\u7528\u3002<\/p>\n<p>\u542c\u8bf4\u6709\u5f15\u5165\u8303\u578b\u7684\u8ba1\u5212\uff0c\u5982\u679c\u5b9e\u73b0\u4e86\uff0c\u5c31\u4e0d\u7528\u5199\u8fd9\u79cd\u4ee3\u7801\u4e86\uff0c\u611f\u89c9\u771f\u4e0d\u9519\u5462\u3002<\/p>\n<p>\u5728\u6027\u80fd\u65b9\u9762\uff0c-\u8bd5\u4e86\u4f7f\u75281\u4e07\u6761\u6570\u636e\u8fdb\u884c\u67e5\u627e\u7684\u60c5\u51b5\u4e0b\uff0c<\/p>\n<ul class=\"post-ul\">\n\u578b\u6307\u5b9a\uff1a55ms<br \/>\n\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\uff1a58ms\n<\/ul>\n<p>\u56e0\u4e3a\u5dee\u522b\u53ea\u6709\u5927\u7ea63\u6beb\u79d2\u5de6\u53f3\uff0c\u6240\u4ee5\u5e94\u8be5\u53ef\u4ee5\u4f7f\u7528\uff0c\u4e0d\u662f\u5417\uff1f<\/p>\n<p>\u6b64\u5916\uff0c\u5173\u4e8ecreateSlice\u51fd\u6570\u7684\u5177\u4f53\u5185\u5bb9\uff0c\u4e3a\u4ec0\u4e48\u5fc5\u987b\u8fd9\u6837\u505a\u624d\u80fd\u4f7f\u5176\u6b63\u5e38\u5de5\u4f5c\uff1f\u6211\u8fd8\u6ca1\u6709\u5b8c\u5168\u7406\u89e3\u3002\u3002\u3002<\/p>\n<p>\u203b2019\u5e7406\u670817\u65e5\u8ffd\u8a18\uff1a\u6211\u5199\u4e86\u4e00\u7bc7\u6587\u7ae0\uff0c\u65e8\u5728\u6df1\u5165\u7406\u89e3\u9ed1\u9b54\u6cd5\u4ee3\u7801\u3002<br \/>\nhttps:\/\/qiita.com\/daijinload\/items\/f822e4a208d17e432599<\/p>\n","protected":false},"excerpt":{"rendered":"<p>package main import ( &#8220;context&#8221; &#8220;fmt&#8221; &#8220;log&#8221; &#8220;reflect&#8221; &#8221; [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-30122","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u4f7f\u7528Golang\u7684MongoDriver\u548creflect\u5305\u6765\u83b7\u53d6\u6570\u636e\u7684\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e\u4f7f\u7528Golang\u7684MongoDriver\u548creflect\u5305\u6765\u83b7\u53d6\u6570\u636e\u7684\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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