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1、文档的数据存储格式为BSON，类似于JSON。MongoDB插入数据时会检验数据中是否有“_id”域，如果没有会自动生成。
shell操作有insert和save两种方法。当插入一条数据有“_id”值，并且现在集合中已经有相同的值，使用insert插入时插入不进去，使用save时，会更新数据。
1 > db.student.drop() 2 true 3 > db.student.insert({"_id": 1, "name":"zhangsan", "age": 28}) 4 WriteResult({ "nInserted" : 1 }) 5 > db.student.find() 6 { "_id" : 1, "name" : "zhangsan", "age" : 28 } 7 > db.student.insert({"_id": 1, "name":"zhangsan", "age": 27}) 8 WriteResult({ 9 "nInserted" : 0, 10 "writeError" : { 11 "code" : 11000, 12 "errmsg" : "E11000 duplicate key error collection: zyhdb.student index: _id_ dup key: { : 1.0 }" 13 } 14 }) 15 > db.student.find() 16 { "_id" : 1, "name" : "zhangsan", "age" : 28 } 17 > db.student.save({"_id": 1, "name":"zhangsan", "age": 27}) 18 WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 }) 19 > db.student.find() 20 { "_id" : 1, "name" : "zhangsan", "age" : 27 }
2、批量插入，网上的文档都说不能MongoDB不支持批量插入，现在试过可以，应该是目前的版本支持批量插入了。
1 > db.student.insert([{"_id": 2, "name": "lisi"},{"_id": 3, "name": "wangwu"}, {"_id": 4, "name": "zhaoliu", "age": 28}]) 2 BulkWriteResult({ 3 "writeErrors" : [ ], 4 "writeConcernErrors" : [ ], 5 "nInserted" : 3, 6 "nUpserted" : 0, 7 "nMatched" : 0, 8 "nModified" : 0, 9 "nRemoved" : 0, 10 "upserted" : [ ] 11 }) 12 > db.student.find() 13 { "_id" : 1, "name" : "zhangsan", "age" : 27 } 14 { "_id" : 2, "name" : "lisi" } 15 { "_id" : 3, "name" : "wangwu" } 16 { "_id" : 4, "name" : "zhaoliu", "age" : 28 }
3、循环插入：
1 > for(var i=0; i<10; i++){db.fortest.insert({num: i})} 2 WriteResult({ "nInserted" : 1 }) 3 > db.fortest.find() 4 { "_id" : ObjectId("57469e80142cea1d9aeabab5"), "num" : 0 } 5 { "_id" : ObjectId("57469e80142cea1d9aeabab6"), "num" : 1 } 6 { "_id" : ObjectId("57469e80142cea1d9aeabab7"), "num" : 2 } 7 { "_id" : ObjectId("57469e80142cea1d9aeabab8"), "num" : 3 } 8 { "_id" : ObjectId("57469e80142cea1d9aeabab9"), "num" : 4 } 9 { "_id" : ObjectId("57469e80142cea1d9aeababa"), "num" : 5 } 10 { "_id" : ObjectId("57469e80142cea1d9aeababb"), "num" : 6 } 11 { "_id" : ObjectId("57469e80142cea1d9aeababc"), "num" : 7 } 12 { "_id" : ObjectId("57469e80142cea1d9aeababd"), "num" : 8 } 13 { "_id" : ObjectId("57469e80142cea1d9aeababe"), "num" : 9 }
MongoDB快速入门学习笔记3 MongoDB的文档插入操作
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原文地址：http://www.cnblogs.com/zhangyanhu/p/5532688.html
