{"id":341,"date":"2024-01-02T06:10:28","date_gmt":"2023-10-31T06:37:57","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/mongodb-findone-%e7%a4%ba%e4%be%8b\/"},"modified":"2025-08-02T00:03:39","modified_gmt":"2025-08-01T16:03:39","slug":"mongodb-findone-%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/mongodb-findone-%e7%a4%ba%e4%be%8b\/","title":{"rendered":"MongoDB findOne\u65b9\u6cd5\u8be6\u89e3\uff1a\u5b9e\u7528\u793a\u4f8b\u4e0e\u6700\u4f73\u5b9e\u8df5"},"content":{"rendered":"<p>\u8fd9\u662f\u6587\u7ae0\u300aMongoDB findOne \u793a\u4f8b\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51711\u90e8\u5206\uff09\u3002<\/p>\n<p>\u5185\u5bb9\u7247\u6bb5: MongoDB\u7684findOne()\u65b9\u6cd5\u8fd4\u56de\u53ea\u6ee1\u8db3\u8f93\u5165\u6761\u4ef6\u7684\u4e00\u4e2a\u6587\u6863\u3002\u5982\u679c\u8f93\u5165\u6761\u4ef6\u5339\u914d\u591a\u4e2a\u6587\u6863\uff0c\u8be5\u65b9\u6cd5\u4f1a\u6309\u7167\u81ea\u7136\u6392\u5e8f\u53ea\u8fd4\u56de\u4e00\u4e2a\u6587\u6863\uff0c\u8fd9\u4e2a\u81ea\u7136\u6392\u5e8f\u53cd\u6620\u4e86\u6587\u6863\u5728\u6570\u636e\u5e93\u4e2d\u7684\u5b58\u50a8\u987a\u5e8f\u3002<\/p>\n<h2>MongoDB\u7684findOne\u65b9\u6cd5<\/h2>\n<p>MongoDB\u7684findOne()\u8bed\u6cd5\u662f\uff1a<code>db.collection.findOne(&lt;criteria&gt;, &lt;projection&gt;)<\/code>\u3002<\/p>\n<ul>\n<li><strong>criteria<\/strong> &#8211; \u6307\u5b9a\u67e5\u8be2\u7684\u9009\u62e9\u6761\u4ef6\u3002<\/li>\n<li><strong>projection<\/strong> &#8211; \u6307\u5b9a\u8fd4\u56de\u6587\u6863\u4e2d\u8981\u663e\u793a\u7684\u5b57\u6bb5\u5217\u8868\u3002<\/li>\n<\/ul>\n<p>\u6709\u5173MongoDB findOne\u7684\u51e0\u4e2a\u91cd\u8981\u70b9\uff1a<\/p>\n<ul>\n<li>\u6295\u5f71\u53c2\u6570\u63a5\u53d7\u5e03\u5c14\u503c1\u6216true\uff08\u8868\u793a\u5305\u542b\uff09\uff0c0\u6216false\uff08\u8868\u793a\u6392\u9664\uff09\u3002\u5982\u679c\u672a\u6307\u5b9a\u6295\u5f71\u5b57\u6bb5\uff0c\u5c06\u68c0\u7d22\u6240\u6709\u5b57\u6bb5\u3002<\/li>\n<li>MongoDB\u7684findOne()\u51fd\u6570\u59cb\u7ec8\u5305\u542b_id\u5b57\u6bb5\uff0c\u5373\u4f7f\u5728\u6295\u5f71\u53c2\u6570\u4e2d\u6ca1\u6709\u660e\u786e\u6307\u5b9a\uff0c\u9664\u975e\u8be5\u5b57\u6bb5\u88ab\u660e\u786e\u6392\u9664\u3002<\/li>\n<li>MongoDB\u7684findOne()\u51fd\u6570\u53ea\u8fd4\u56de\u4e00\u4e2a\u6587\u6863\u800c\u4e0d\u662f\u6307\u9488\u3002<\/li>\n<\/ul>\n<h3>MongoDB\u7684findOne\u65b9\u6cd5 &#8211; \u7a7a\u7684\u67e5\u8be2\u89c4\u8303<\/h3>\n<p>\u8fd9\u4e2a\u64cd\u4f5c\u4ece\u6307\u5b9a\u7684\u96c6\u5408\u4e2d\u8fd4\u56de\u4e00\u4e2a\u6587\u6863\u3002\u4f8b\u5982\uff0c\u6267\u884c<code>db.car.findOne()<\/code>\u547d\u4ee4\u4f1a\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>{\r\n    \"_id\" : 2,\r\n    \"name\" : \"Polo\", \r\n    \"color\" : \"White\",\r\n    \"cno\" : \"H411\", \r\n    \"speed\" : 45, \r\n    \"mfdcountry\" : \"Japan\"\r\n}\r\n<\/code><\/pre>\n<p>\u4ece\u6c7d\u8f66\u96c6\u5408\u4e2d\u4ec5\u68c0\u7d22\u5230\u4e00\u6761\u8bb0\u5f55\u3002\u8bf7\u6ce8\u610f\uff0c&#8221;Polo&#8221; \u662f\u9996\u5148\u63d2\u5165\u5230\u6570\u636e\u5e93\u4e2d\u7684\u6587\u6863\u3002<\/p>\n<h3>MongoDB\u7684findOne\u65b9\u6cd5 &#8211; \u67e5\u8be2\u89c4\u8303<\/h3>\n<p>\u8be5MongoDB\u7684findOne\u64cd\u4f5c\u4ece\u6307\u5b9a\u7684\u96c6\u5408\u4e2d\u8fd4\u56de\u7b2c\u4e00\u4e2a\u4e0e\u8f93\u5165\u7684\u9009\u62e9\u6761\u4ef6\u5339\u914d\u7684\u6587\u6863\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code>&gt; db.car.findOne(\r\n... {\r\n...     $or: [\r\n...         {name: \"Zen\"},\r\n...         {speed: {$gt: 60}}\r\n...     ]\r\n... }\r\n... )\r\n\r\n{\r\n    \"_id\" : ObjectId(\"546cb92393f464ed49d620db\"), \r\n    \"name\" : \"Zen\",\r\n    \"color\" : \"JetRed\",\r\n    \"cno\" : \"H671\",\r\n    \"speed\" : 67, \r\n    \"mfdcountry\" : \"Rome\"\r\n}\r\n<\/code><\/pre>\n<p>\u8fd9\u4e2a\u64cd\u4f5c\u5728\u6c7d\u8f66\u96c6\u5408\u4e2d\u641c\u7d22\u540d\u4e3a&#8221;Zen&#8221;\u7684\u6c7d\u8f66\u6216\u901f\u5ea6\u5927\u4e8e60\u7684\u6c7d\u8f66\uff0c\u5e76\u68c0\u7d22\u6ee1\u8db3\u6240\u8f93\u5165\u6761\u4ef6\u7684\u7b2c\u4e00\u4e2a\u6587\u6863\u3002<\/p>\n<h3>\u5728MongoDB\u7684findOne()\u65b9\u6cd5\u4e2d\u4f7f\u7528\u6295\u5f71\u529f\u80fd<\/h3>\n<p>\u6295\u5f71\u53c2\u6570\u4e5f\u9002\u7528\u4e8eMongoDB\u7684findOne\u65b9\u6cd5\u3002\u8ba9\u6211\u4eec\u770b\u4e00\u4e9b\u4f7f\u7528\u6295\u5f71\u7684\u60c5\u51b5\u3002<\/p>\n<h4>\u4f7f\u7528MongoDB\u7684findOne\u51fd\u6570\u6307\u5b9a\u8981\u8fd4\u56de\u7684\u5b57\u6bb5<\/h4>\n<p>\u6b64\u64cd\u4f5c\u5c06\u4ec5\u663e\u793a\u67e5\u8be2\u4e2d\u6307\u5b9a\u7684\u5b57\u6bb5\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code>&gt; db.car.findOne(\r\n... { },\r\n... {name: 1, color: 1}\r\n... )\r\n\r\n{ \"_id\" : 2, \"name\" : \"Polo\", \"color\" : \"White\" }\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u4ee3\u7801\u5c55\u793a\u4e86\u6765\u81ea\u6c7d\u8f66\u96c6\u5408\u7684\u7b2c\u4e00\u4e2a\u6587\u6863\uff0c\u5176\u4e2d\u5305\u542b_id\u3001name\u548ccolor\u5b57\u6bb5\u3002<\/p>\n<h3>MongoDB\u7684findOne &#8211; \u8fd4\u56de\u9664\u4e86\u88ab\u6392\u9664\u7684\u5b57\u6bb5\u4e4b\u5916\u7684\u6240\u6709\u5b57\u6bb5<\/h3>\n<p>\u672c\u64cd\u4f5c\u6839\u636e\u9009\u62e9\u6761\u4ef6\u6392\u9664\u6307\u5b9a\u5b57\u6bb5\uff0c\u4ee5\u68c0\u7d22\u7b2c\u4e00\u4e2a\u6587\u6863\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code>&gt; db.car.findOne(\r\n... { name: \"Volkswagen\" },\r\n... {_id: 0, mfdcountry: 0, cno: 0 }\r\n... )\r\n\r\n{ \"name\" : \"Volkswagen\", \"color\" : \"JetBlue\", \"speed\" : 62 }\r\n<\/code><\/pre>\n<p>\u5728Volkswagen\u8f66\u578b\u4e2d\uff0c\u6392\u9664\u4e86_id\u3001mfdcountry\u548ccno\u5b57\u6bb5\uff0c\u5e76\u8fd4\u56de\u5305\u542bname\u3001color\u548cspeed\u5b57\u6bb5\u7684\u6587\u6863\u3002<\/p>\n<h3>MongoDB\u7684findOne\u67e5\u8be2\u7ed3\u679c\u6587\u6863<\/h3>\n<p>\u7531\u4e8e\u8be5\u65b9\u6cd5\u4ec5\u8fd4\u56de\u5355\u4e2a\u6587\u6863\uff0c\u5149\u6807\u65b9\u6cd5\u5728\u6b64\u64cd\u4f5c\u4e2d\u65e0\u6cd5\u4f7f\u7528\u3002\u4e3a\u4e86\u6253\u5370\u6587\u6863\u4e2d\u7684\u5404\u4e2a\u5b57\u6bb5\u503c\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n<pre class=\"post-pre\"><code>&gt; var car = db.car.findOne(); \r\n&gt; if (car) {\r\n...     var carName = car.name;\r\n...     print(tojson(carName));\r\n... }\r\n\r\n\"Polo\"\r\n<\/code><\/pre>\n<p>\u8fd9\u6bb5\u4ee3\u7801\u53ea\u68c0\u7d22\u5e76\u6253\u5370\u4e86\u6c7d\u8f66\u7684\u540d\u5b57&#8221;Polo&#8221;\u3002<\/p>\n<h3>MongoDB\u7684findOne Java\u793a\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u5c55\u793a\u4e86\u53ef\u4ee5\u4f7f\u7528MongoDB findOne()\u7684\u4e0d\u540c\u9009\u9879\u7684Java\u7a0b\u5e8f\u3002\u6587\u4ef6\u540d\uff1aMongoDBFindOne.java<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.mongodb;\r\n\r\nimport com.mongodb.BasicDBObject;\r\nimport com.mongodb.DB;\r\nimport com.mongodb.DBCollection;\r\nimport com.mongodb.DBObject;\r\nimport com.mongodb.MongoClient;\r\n\r\nimport java.net.UnknownHostException;\r\n\r\npublic class MongoDBFindOne {\r\n\r\n    \/\/ \u65e0\u6761\u4ef6\u68c0\u7d22\u7b2c\u4e00\u4e2a\u6587\u6863\u7684\u65b9\u6cd5\r\n    public static void emptyFindOne() throws UnknownHostException {\r\n\r\n        \/\/ \u83b7\u53d6\u6570\u636e\u5e93\u7684\u65b0\u8fde\u63a5\uff0c\u5047\u8bbe\u6570\u636e\u5e93\u6b63\u5728\u8fd0\u884c\r\n        MongoClient mongoClient = new MongoClient(\"localhost\");\r\n\r\n        \/\/ \u4f7f\u7528test\u4f5c\u4e3a\u6570\u636e\u5e93\uff0c\u8fd9\u91cc\u8bf7\u4f7f\u7528\u60a8\u81ea\u5df1\u7684\u6570\u636e\u5e93\r\n        DB db = mongoClient.getDB(\"test\");\r\n\r\n        \/\/ \u83b7\u53d6\u96c6\u5408\u5bf9\u8c61\uff0c\u8fd9\u91cc\u4f7f\u7528car\u96c6\u5408\uff0c\u8bf7\u4f7f\u7528\u60a8\u81ea\u5df1\u7684\u96c6\u5408\r\n        DBCollection coll = db.getCollection(\"car\");\r\n\r\n        \/\/ \u8c03\u7528findOne()\u65b9\u6cd5\r\n        DBObject doc = coll.findOne();\r\n\r\n        \/\/ \u6253\u5370\u7ed3\u679c\u6587\u6863\r\n        System.out.println(doc);\r\n    }\r\n\r\n    \/\/ \u6839\u636e\u9009\u62e9\u6761\u4ef6\u68c0\u7d22\u6587\u6863\u7684\u65b9\u6cd5\r\n    public static void querySpecification() throws UnknownHostException {\r\n        \/\/ \u6bcf\u6b21\u83b7\u53d6\u8fde\u63a5\u4e0d\u662f\u5fc5\u9700\u7684\uff08\u53ef\u4ee5\u5168\u5c40\u53ea\u505a\u4e00\u6b21\uff09\r\n        MongoClient mongoClient = new MongoClient(\"localhost\");\r\n        DB db = mongoClient.getDB(\"test\");\r\n        DBCollection coll = db.getCollection(\"car\");\r\n\r\n        \/\/ \u901a\u8fc7\u521b\u5efa\u65b0\u5bf9\u8c61\u6765\u57fa\u4e8e\u540d\u79f0\u548c\u901f\u5ea6\u503c\u7b5b\u9009\u6587\u6863\u7684\u67e5\u8be2\r\n        DBObject query = new BasicDBObject(\"name\", \"Zen\").append(\"speed\",\r\n                new BasicDBObject(\"$gt\", 30));\r\n\r\n        \/\/ \u901a\u8fc7\u6ee1\u8db3\u6761\u4ef6\u83b7\u53d6\u7684\u7ed3\u679c\u6587\u6863\r\n        DBObject d1 = coll.findOne(query);\r\n\r\n        \/\/ \u5728\u63a7\u5236\u53f0\u6253\u5370\u6587\u6863\r\n        System.out.println(d1);\r\n    }\r\n\r\n    public static void projectionFields() throws UnknownHostException {\r\n\r\n        MongoClient mongoClient = new MongoClient(\"localhost\");\r\n        DB db = mongoClient.getDB(\"test\");\r\n        DBCollection coll = db.getCollection(\"car\");\r\n\r\n        \/\/ \u521b\u5efa\u65b0\u7684\u6570\u636e\u5e93\u5bf9\u8c61\r\n        BasicDBObject b1 = new BasicDBObject();\r\n\r\n        \/\/ \u5728\u7ed3\u679c\u6587\u6863\u4e2d\u53ea\u663e\u793a\u540d\u79f0\u548c\u989c\u8272\u5b57\u6bb5\u7684\u6761\u4ef6\r\n        BasicDBObject fields = new BasicDBObject(\"name\", 1).append(\"color\", 1);\r\n\r\n        \/\/ \u901a\u8fc7\u63a5\u53d7\u5b57\u6bb5\u548c\u5bf9\u8c61\u6761\u4ef6\u6765\u68c0\u7d22\u6587\u6863\u7684\u65b9\u6cd5\r\n        DBObject d1 = coll.findOne(b1, fields);\r\n\r\n        System.out.println(d1);\r\n\r\n    }\r\n\r\n    public static void excludeByfields() throws UnknownHostException {\r\n        MongoClient m1 = new MongoClient(\"localhost\");\r\n\r\n        DB db = m1.getDB(\"test\");\r\n        DBCollection col = db.getCollection(\"car\");\r\n\r\n        \/\/ \u6c7d\u8f66\u540d\u79f0\u4e3avolkswagen\u7684\u7b5b\u9009\u6761\u4ef6\r\n        DBObject query = new BasicDBObject(\"name\", \"Volkswagen\");\r\n\r\n        \/\/ \u6392\u9664mfdcountry\u3001cno\u548cid\u5b57\u6bb5\r\n        BasicDBObject fields = new BasicDBObject(\"mfdcountry\", 0).append(\"cno\",\r\n                0).append(\"_id\", 0);\r\n\r\n        DBObject d1 = col.findOne(query, fields);\r\n        System.out.println(d1);\r\n    }\r\n\r\n    public static void printDoc() throws UnknownHostException {\r\n        MongoClient m1 = new MongoClient(\"localhost\");\r\n        DB db = m1.getDB(\"test\");\r\n        DBCollection col = db.getCollection(\"car\");\r\n        \r\n        DBObject d1 = col.findOne();\r\n        \r\n        \/\/ \u53ea\u6253\u5370\u6c7d\u8f66\u7684\u540d\u79f0\r\n        System.out.println((d1.get(\"name\")));\r\n    }\r\n    \r\n    public static void main(String[] args) throws UnknownHostException {\r\n        \/\/ \u4ecemain\u65b9\u6cd5\u8c03\u7528\u6240\u6709\u65b9\u6cd5\r\n        emptyFindOne();\r\n        querySpecification();\r\n        projectionFields();\r\n        excludeByfields();\r\n        printDoc();\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u7684\u8f93\u51fa\u662f\uff1a<\/p>\n<pre class=\"post-pre\"><code>{ \"_id\" : 2.0 , \"name\" : \"Polo\" , \"color\" : \"White\" , \"cno\" : \"H411\" , \"speed\" : 45.0 , \"mfdcountry\" : \"Japan\"}\r\n{ \"_id\" : { \"$oid\" : \"546cb92393f464ed49d620db\"} , \"name\" : \"Zen\" , \"color\" : \"JetRed\" , \"cno\" : \"H671\" , \"speed\" : 67 , \"mfdcountry\" : \"Rome\"}\r\n{ \"_id\" : 2.0 , \"name\" : \"Polo\" , \"color\" : \"White\"}\r\n{ \"name\" : \"Volkswagen\" , \"color\" : \"JetBlue\" , \"speed\" : 62}\r\nPolo\r\n<\/code><\/pre>\n<p>\u8fd9\u5c31\u662f\u5173\u4e8eMongoDB\u7684findOne()\u65b9\u6cd5\u7684\u5168\u90e8\u5185\u5bb9\uff0c\u6211\u4eec\u5c06\u5728\u540e\u7eed\u7684\u6587\u7ae0\u4e2d\u4ecb\u7ecd\u66f4\u591a\u5173\u4e8eMongoDB\u7684\u9009\u9879\u3002\u53c2\u8003\u8d44\u6599\uff1a\u5b98\u65b9\u6587\u6863\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u662f\u6587\u7ae0\u300aMongoDB findOne \u793a\u4f8b\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51711\u90e8\u5206\uff09\u3002 \u5185\u5bb9\u7247\u6bb5: MongoDB\u7684find [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1144,907,706,1138,1145],"class_list":["post-341","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-findone","tag-mongodb","tag-nosql","tag-1138","tag-1145"],"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>MongoDB findOne\u65b9\u6cd5\u8be6\u89e3\uff1a\u5b9e\u7528\u793a\u4f8b\u4e0e\u6700\u4f73\u5b9e\u8df5 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u6df1\u5165\u4e86\u89e3MongoDB 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