mongodbCRUD操作-INSERT
# ./mongod
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2018-04-15T18:52:36.352+0800 I CONTROL [initandlisten] MongoDB starting : pid=36578 port=27017 dbpath=/data/db 64-bit host=IBG-opensource-DB-cwT13 2018-04-15T18:52:36.352+0800 I CONTROL [initandlisten] db version v3.6.2 2018-04-15T18:52:36.352+0800 I CONTROL [initandlisten] git version: 489d177dbd0f0420a8ca04d39fd78d0a2c539420 2018-04-15T18:52:36.352+0800 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.1e-fips 11 Feb 2013 2018-04-15T18:52:36.352+0800 I CONTROL [initandlisten] allocator: tcmalloc 2018-04-15T18:52:36.352+0800 I CONTROL [initandlisten] modules: none 2018-04-15T18:52:36.352+0800 I CONTROL [initandlisten] build environment: 2018-04-15T18:52:36.352+0800 I CONTROL [initandlisten] distmod: rhel70 2018-04-15T18:52:36.352+0800 I CONTROL [initandlisten] distarch: x86_64 2018-04-15T18:52:36.352+0800 I CONTROL [initandlisten] target_arch: x86_64 2018-04-15T18:52:36.352+0800 I CONTROL [initandlisten] options: {} 2018-04-15T18:52:36.354+0800 I - [initandlisten] Detected data files in /data/db created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'. 2018-04-15T18:52:36.354+0800 I STORAGE [initandlisten] wiredtiger_open config: create,cache_size=7423M,session_max=20000,eviction=(threads_min=4,threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),statistics_log=(wait=0),verbose=(recovery_progress), 2018-04-15T18:52:36.512+0800 I STORAGE [initandlisten] WiredTiger message [1523789556:512963][36578:0x7f6aac8c2b00], txn-recover: Main recovery loop: starting at 2/35072 2018-04-15T18:52:36.615+0800 I STORAGE [initandlisten] WiredTiger message [1523789556:615462][36578:0x7f6aac8c2b00], txn-recover: Recovering log 2 through 3 2018-04-15T18:52:36.676+0800 I STORAGE [initandlisten] WiredTiger message [1523789556:676715][36578:0x7f6aac8c2b00], txn-recover: Recovering log 3 through 3 2018-04-15T18:52:36.740+0800 I CONTROL [initandlisten] 2018-04-15T18:52:36.740+0800 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database. 2018-04-15T18:52:36.740+0800 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted. 2018-04-15T18:52:36.740+0800 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended. 2018-04-15T18:52:36.740+0800 I CONTROL [initandlisten] 2018-04-15T18:52:36.740+0800 I CONTROL [initandlisten] ** WARNING: This server is bound to localhost. 2018-04-15T18:52:36.740+0800 I CONTROL [initandlisten] ** Remote systems will be unable to connect to this server. 2018-04-15T18:52:36.740+0800 I CONTROL [initandlisten] ** Start the server with --bind_ip to specify which IP 2018-04-15T18:52:36.740+0800 I CONTROL [initandlisten] ** addresses it should serve responses from, or with --bind_ip_all to 2018-04-15T18:52:36.740+0800 I CONTROL [initandlisten] ** bind to all interfaces. If this behavior is desired, start the 2018-04-15T18:52:36.740+0800 I CONTROL [initandlisten] ** server with --bind_ip 127.0.0.1 to disable this warning. 2018-04-15T18:52:36.740+0800 I CONTROL [initandlisten] 2018-04-15T18:52:36.741+0800 I CONTROL [initandlisten] 2018-04-15T18:52:36.741+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'. 2018-04-15T18:52:36.741+0800 I CONTROL [initandlisten] ** We suggest setting it to 'never' 2018-04-15T18:52:36.741+0800 I CONTROL [initandlisten] 2018-04-15T18:52:36.741+0800 I CONTROL [initandlisten] ** WARNING: soft rlimits too low. rlimits set to 65535 processes, 655350 files. Number of processes should be at least 327675 : 0.5 times number of files. 2018-04-15T18:52:36.741+0800 I CONTROL [initandlisten] 2018-04-15T18:52:36.755+0800 I FTDC [initandlisten] Initializing full-time diagnostic data capture with directory '/data/db/diagnostic.data' 2018-04-15T18:52:36.756+0800 I NETWORK [initandlisten] waiting for connections on port 27017
# ./mongo
MongoDB shell version v3.6.2 connecting to: mongodb://127.0.0.1:27017 MongoDB server version: 3.6.2 Server has startup warnings: 2018-04-15T11:01:19.795+0800 I CONTROL [initandlisten] 2018-04-15T11:01:19.795+0800 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database. 2018-04-15T11:01:19.795+0800 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted. 2018-04-15T11:01:19.795+0800 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended. 2018-04-15T11:01:19.795+0800 I CONTROL [initandlisten] 2018-04-15T11:01:19.795+0800 I CONTROL [initandlisten] ** WARNING: This server is bound to localhost. 2018-04-15T11:01:19.795+0800 I CONTROL [initandlisten] ** Remote systems will be unable to connect to this server. 2018-04-15T11:01:19.795+0800 I CONTROL [initandlisten] ** Start the server with --bind_ip to specify which IP 2018-04-15T11:01:19.795+0800 I CONTROL [initandlisten] ** addresses it should serve responses from, or with --bind_ip_all to 2018-04-15T11:01:19.795+0800 I CONTROL [initandlisten] ** bind to all interfaces. If this behavior is desired, start the 2018-04-15T11:01:19.795+0800 I CONTROL [initandlisten] ** server with --bind_ip 127.0.0.1 to disable this warning. 2018-04-15T11:01:19.795+0800 I CONTROL [initandlisten] 2018-04-15T11:01:19.796+0800 I CONTROL [initandlisten] 2018-04-15T11:01:19.796+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'. 2018-04-15T11:01:19.796+0800 I CONTROL [initandlisten] ** We suggest setting it to 'never' 2018-04-15T11:01:19.796+0800 I CONTROL [initandlisten] 2018-04-15T11:01:19.796+0800 I CONTROL [initandlisten] ** WARNING: soft rlimits too low. rlimits set to 65535 processes, 655350 files. Number of processes should be at least 327675 : 0.5 times number of files. 2018-04-15T11:01:19.796+0800 I CONTROL [initandlisten]
https://docs.mongodb.com/manual/reference/method/db.collection.insert/
一、插入文档
插入行为,,如果集合不存在,则创建
Collection Creation:
If the collection does not currently exist, insert operations will create the collection.
方法:
insertOne
db.collection.insertOne(, { writeConcern: //Optional. A document expressing the write concern. Omit to use the default write concern. } )
注意:
集合不存在该操作会创建集合。
该操作不支持 db.collection.explain() 查询计划 可以使用insert 代替。
_id Field:
If the document does not specify an _id field, MongoDB adds the _id field with an ObjectId value to the new document.
ObjectId值由12个字节组成,其中前四个字节是反映ObjectId创建的时间戳,具体为:
a 4-byte value representing the seconds since the Unix epoch,
a 3-byte machine identifier,
a 2-byte process id, and
a 3-byte counter, starting with a random value.
> db.products.insertOne( { item: "card", qty: 15 } );
{ "acknowledged" : true, 返回值 "insertedId" : ObjectId("5ad2c1572c23d0642cd35b48") } > db.products.find(); { "_id" : ObjectId("5ad2c1572c23d0642cd35b48"), "item" : "card", "qty" : 15 }
> db.products.insertOne(
{ "item": "envelopes", "qty": 100, type: "Self-Sealing" },
{ writeConcern: { w : "majority", wtimeout : 100 } } //w:majority,表示>1/2的节点有数据
)
{ "acknowledged" : true, "insertedId" : ObjectId("5ad2cecd2c23d0642cd35b4c") }
insertMany
db.collection.insertMany( { [, , ... ] },//An array of documents to insert into the collection. 注意是数组 { writeConcern: , ordered: //Optional. A boolean specifying whether the mongod instance should perform an ordered or unordered insert. Defaults to true. 默认式按照顺序添加的 顺序添加的速度要慢于不按顺序添加的 } )
注意:
每一组操作最大可以有1000个文档。
顺序添加的速度要慢于不按顺序添加的。
不存在的集合会自动创建。
insertMany() 也不支持db.collection.explain() 可以使用insert 代替。
如果添加出错会报出 BulkWriteError exception 异常,按照顺序添加的 操作遇到错误会直接停止,而不按照顺序的会继续执行在队列中的写操作。
> db.products.insertMany( [
{ item: "card", qty: 15 },
{ item: "envelope", qty: 20 },
{ item: "stamps" , qty: 30 }
] , { w: "majority", wtimeout: 100 }
);
{ "acknowledged" : true, "insertedIds" : [ ObjectId("5ad2c2332c23d0642cd35b49"), ObjectId("5ad2c2332c23d0642cd35b4a"), ObjectId("5ad2c2332c23d0642cd35b4b") ] }
insert
db.collection.insert( #同时又insertOne 和insertMany的功能, //数组或者文档都可以添加 { writeConcern: , ordered: //跟insertMany()操作作用一致 } )
db.products.insert( [
{ item: "card", qty: 15 },
{ item: "envelope", qty: 20 },
{ item: "stamps" , qty: 30 }
] , { w: "majority", wtimeout: 100 }
);
db.products.insert( { item: "card", qty: 40 } );
Additional Methods for Inserts
when used with the upsert: true option:以下方法当没有查询条件匹配时创建新文档,默认是false。
db.collection.update() db.collection.updateOne() db.collection.updateMany() db.collection.findAndModify() db.collection.findOneAndUpdate() db.collection.findOneAndReplace() db.collection.save() db.collection.bulkWrite()
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