MongoDB\u306efindOne()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u5165\u529b\u3057\u305f\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u30921\u3064\u3060\u3051\u8fd4\u3057\u307e\u3059\u3002\u3082\u3057\u5165\u529b\u3057\u305f\u6761\u4ef6\u304c\u8907\u6570\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3068\u4e00\u81f4\u3059\u308b\u5834\u5408\u3001\u30e1\u30bd\u30c3\u30c9\u306f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u9806\u5e8f\u3092\u53cd\u6620\u3057\u305f\u81ea\u7136\u306a\u9806\u5e8f\u306b\u5f93\u3063\u30661\u3064\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u307f\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
MongoDB\u306efindOne()\u306e\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059: db.collection.findOne(, ) criteria – \u5165\u529b\u3055\u308c\u305f\u9078\u629e\u6761\u4ef6\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002projection – \u8fd4\u3055\u308c\u308b\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u8868\u793a\u3055\u308c\u308b\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u30ea\u30b9\u30c8\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002MongoDB\u306efindOne\u306b\u3064\u3044\u3066\u306e\u3044\u304f\u3064\u304b\u306e\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
<\/p>\n
<\/p>\n
\u6307\u5b9a\u3055\u308c\u305f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304b\u3089\u30011\u3064\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u8fd4\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001db.car.findOne()\u306e\u51fa\u529b:<\/p>\n
{\r\n\"_id\" : 2,\r\n\"name\" : \"Polo\", \"color\" : \"White\",\r\n\"cno\" : \"H411\", \"speed\" : 45, \"mfdcountry\" : \"Japan\"\r\n}\r\n<\/code><\/pre>\n\u8eca\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304b\u3089\u30ec\u30b3\u30fc\u30c9\u306f1\u4ef6\u3060\u3051\u53d6\u5f97\u3055\u308c\u307e\u3059\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u306f\u6700\u521d\u306b\u300c\u30dd\u30ed\u300d\u304c\u633f\u5165\u3055\u308c\u305f\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
MongoDB\u306efindOne – \u30af\u30a8\u30ea\u4ed5\u69d8<\/h3>\n
\u6307\u5b9a\u3055\u308c\u305f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304b\u3089\u6700\u521d\u306b\u4e00\u81f4\u3059\u308b\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u8fd4\u3059MongoDB\u306efindOne\u64cd\u4f5c\u306f\u3001\u5165\u529b\u3055\u308c\u305f\u9078\u629e\u57fa\u6e96\u3068\u3068\u3082\u306b\u8fd4\u3055\u308c\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001<\/p>\n
>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\"_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\u300cZen\u300d\u3068\u3044\u3046\u540d\u524d\u306e\u8eca\u304b\u3001\u307e\u305f\u306f\u901f\u5ea6\u304c60\u4ee5\u4e0a\u306e\u8eca\u3092\u691c\u7d22\u3057\u3001\u6761\u4ef6\u3092\u6e80\u305f\u3059\u6700\u521d\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u8eca\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304b\u3089\u53d6\u5f97\u3059\u308b\u3001\u3053\u306e\u64cd\u4f5c\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n
MongoDB\u306efindOne()\u3067\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30b7\u30e7\u30f3<\/h3>\n
\u30d7\u30ed\u30b8\u30a7\u30af\u30b7\u30e7\u30f3\u30d1\u30e9\u30e1\u30fc\u30bf\u306f\u3001MongoDB\u306efindOne\u30e1\u30bd\u30c3\u30c9\u306b\u3082\u9069\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002findOne\u306b\u304a\u3044\u3066\u30d7\u30ed\u30b8\u30a7\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3067\u304d\u308b\u30b7\u30ca\u30ea\u30aa\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
MongoDB\u306efindOne\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u8fd4\u3055\u308c\u308b\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u6307\u5b9a\u3059\u308b\u3002<\/h3>\n
\u3053\u306e\u64cd\u4f5c\u306f\u3001\u30af\u30a8\u30ea\u3067\u6307\u5b9a\u3055\u308c\u305f\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u307f\u3092\u8868\u793a\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\uff1a<\/p>\n
>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>\nID\u3001\u540d\u524d\u3001\u8272\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u6301\u3064\u30ab\u30fc\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u6700\u521d\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n
MongoDB\u306efindOne\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u9664\u5916\u3055\u308c\u305f\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u542b\u3081\u305a\u306b\u3059\u3079\u3066\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u8fd4\u3057\u307e\u3059\u3002<\/h3>\n
\u9078\u629e\u57fa\u6e96\u306b\u6307\u5b9a\u3055\u308c\u305f\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u9664\u5916\u3057\u305f\u6700\u521d\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u53d6\u5f97\u3059\u308b\u3053\u306e\u64cd\u4f5c\u3002\u4f8b\u3048\u3070\uff1b<\/p>\n
>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>\nVolkswagen\u3068\u3044\u3046\u8eca\u306e\u540d\u79f0\u3092\u53d6\u5f97\u3057\u307e\u3059\u304c\u3001id\u3001mfdcountry\u3001cno\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u9664\u5916\u3055\u308c\u307e\u3059\u3002<\/p>\n
MongoDB\u306efindOne\u306e\u7d50\u679c\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/h3>\n
\u3053\u306e\u64cd\u4f5c\u3067\u306f\u3001\u30ab\u30fc\u30bd\u30eb\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u6a5f\u80fd\u3057\u307e\u305b\u3093\u3002\u306a\u305c\u306a\u3089\u305d\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u5358\u4e00\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3057\u304b\u8fd4\u3055\u306a\u3044\u304b\u3089\u3067\u3059\u3002\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304b\u3089\u5404\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5024\u3092\u5370\u5237\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
>var car = db.car.findOne(); \r\n> if (car) {\r\n... \u00a0var carName = car.name;\r\n... \u00a0print (tojson(carName));\r\n... }\r\n\r\n\"Polo\"\r\n<\/code><\/pre>\n\u3053\u306e\u64cd\u4f5c\u306f\u3001\u8eca\u306e\u300c\u30dd\u30ed\u300d\u3068\u3044\u3046\u540d\u524d\u306e\u307f\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/p>\n
\u30cd\u30a4\u30c6\u30a3\u30d6\u306a\u65e5\u672c\u8a9e\u3067\u4ee5\u4e0b\u3092\u8a00\u3044\u63db\u3048\u3066\u304f\u3060\u3055\u3044\u3002\u30aa\u30d7\u30b7\u30e7\u30f3\u306f1\u3064\u3060\u3051\u5fc5\u8981\u3067\u3059\u3002<\/h3>\n
Java\u306eMongoDB\u306efindOne\u306e\u4f8b<\/p>\n
\u4ee5\u4e0b\u306f\u3001MongoDB\u306efindOne()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u305f\u3081\u306e\u3055\u307e\u3056\u307e\u306a\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u793a\u3059Java\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3059\u3002MongoDBFindOne.java<\/p>\n
package com.scdev.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\t\/\/ method retrieves the first document without any criteria\r\n\tpublic static void emptyFindOne() throws UnknownHostException {\r\n\r\n\t\t\/\/ Get a new connection to the db assuming that it is running\r\n\t\tMongoClient mongoClient = new MongoClient(\"localhost\");\r\n\r\n\t\t\/\/ use test as a datbase,use your database here\r\n\t\tDB db = mongoClient.getDB(\"test\");\r\n\r\n\t\t\/\/ fetch the collection object ,car is used here,use your own\r\n\t\tDBCollection coll = db.getCollection(\"car\");\r\n\r\n\t\t\/\/ invoking findOne() method\r\n\t\tDBObject doc = coll.findOne();\r\n\r\n\t\t\/\/ prints the resultant document\r\n\t\tSystem.out.println(doc);\r\n\t}\r\n\r\n\t\/\/ method that retrieves the document based on the selection criteria\r\n\tpublic static void querySpecification() throws UnknownHostException {\r\n\t\t\/\/ getting a connection everytime is not needed (could be done once\r\n\t\t\/\/ globally).\r\n\t\tMongoClient mongoClient = new MongoClient(\"localhost\");\r\n\t\tDB db = mongoClient.getDB(\"test\");\r\n\t\tDBCollection coll = db.getCollection(\"car\");\r\n\r\n\t\t\/\/ query to filter the document based on name and speed values by\r\n\t\t\/\/ creating new object\r\n\t\tDBObject query = new BasicDBObject(\"name\", \"Zen\").append(\"speed\",\r\n\t\t\t\tnew BasicDBObject(\"$gt\", 30));\r\n\r\n\t\t\/\/ resultant document fetched by satisfying the criteria\r\n\t\tDBObject d1 = coll.findOne(query);\r\n\r\n\t\t\/\/ prints the document on console\r\n\t\tSystem.out.println(d1);\r\n\t}\r\n\r\n\tpublic static void projectionFields() throws UnknownHostException {\r\n\r\n\t\tMongoClient mongoClient = new MongoClient(\"localhost\");\r\n\t\tDB db = mongoClient.getDB(\"test\");\r\n\t\tDBCollection coll = db.getCollection(\"car\");\r\n\r\n\t\t\/\/ creates new db object\r\n\t\tBasicDBObject b1 = new BasicDBObject();\r\n\r\n\t\t\/\/ criteria to display only name and color fields in the resultant\r\n\t\t\/\/ document\r\n\t\tBasicDBObject fields = new BasicDBObject(\"name\", 1).append(\"color\", 1);\r\n\r\n\t\t\/\/ method that retrieves the documents by accepting fields and object\r\n\t\t\/\/ criteria\r\n\t\tDBObject d1 = coll.findOne(b1, fields);\r\n\r\n\t\tSystem.out.println(d1);\r\n\r\n\t}\r\n\r\n\tpublic static void excludeByfields() throws UnknownHostException {\r\n\t\tMongoClient m1 = new MongoClient(\"localhost\");\r\n\r\n\t\tDB db = m1.getDB(\"test\");\r\n\t\tDBCollection col = db.getCollection(\"car\");\r\n\r\n\t\t\/\/ filter criteria for car name volkswagen\r\n\t\tDBObject query = new BasicDBObject(\"name\", \"Volkswagen\");\r\n\r\n\t\t\/\/ excluding the fields mfdcountry,cno and id fields\r\n\t\tBasicDBObject fields = new BasicDBObject(\"mfdcountry\", 0).append(\"cno\",\r\n\t\t\t\t0).append(\"_id\", 0);\r\n\r\n\t\tDBObject d1 = col.findOne(query, fields);\r\n\t\tSystem.out.println(d1);\r\n\t}\r\n\r\n\tpublic static void printDoc() throws UnknownHostException {\r\n\t\tMongoClient m1 = new MongoClient(\"localhost\");\r\n\t\tDB db = m1.getDB(\"test\");\r\n\t\tDBCollection col = db.getCollection(\"car\");\r\n\t\t\r\n\t\tDBObject d1 = col.findOne();\r\n\t\t\r\n\t\t\/\/ prints only the name of the car\r\n\t\tSystem.out.println((d1.get(\"name\")));\r\n\t}\r\n\t\r\n\tpublic static void main(String[] args) throws UnknownHostException {\r\n\t\t\/\/ invoking all the methods from main\r\n\t\temptyFindOne();\r\n\t\tquerySpecification();\r\n\t\tprojectionFields();\r\n\t\texcludeByfields();\r\n\t\tprintDoc();\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
{ \"_id\" : 2.0 , \"name\" : \"Polo\" , \"color\" : \"White\" , \"cno\" : \"H411\" , \"speed\" : 45.0 , \"mfdcountry\" : \"Japan\"} \u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\u00ad\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>\nMongoDB\u306efindOne()\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0a\u3067\u3059\u3002\u4eca\u5f8c\u306e\u8a18\u4e8b\u3067\u4ed6\u306eMongoDB\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3082\u898b\u3066\u3044\u304d\u307e\u3059\u3002\u53c2\u8003\uff1a\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/p>\n","protected":false},"excerpt":{"rendered":"
MongoDB\u306efindOne()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u5165\u529b\u3057\u305f\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u30921\u3064\u3060\u3051\u8fd4\u3057\u307e\u3059\u3002\u3082\u3057\u5165\u529b\u3057\u305f\u6761\u4ef6\u304c\u8907\u6570\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3068\u4e00\u81f4\u3059\u308b\u5834\u5408\u3001\u30e1\u30bd\u30c3\u30c9\u306f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u9806\u5e8f\u3092\u53cd\u6620\u3057\u305f\u81ea\u7136\u306a\u9806\u5e8f\u306b\u5f93\u3063 […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-639","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\n
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