{"id":586,"date":"2020-09-23T17:59:31","date_gmt":"2020-09-23T09:59:31","guid":{"rendered":"https:\/\/blog.espnlol.com\/?p=586"},"modified":"2022-04-20T18:21:05","modified_gmt":"2022-04-20T10:21:05","slug":"586","status":"publish","type":"post","link":"https:\/\/blog.espnlol.com\/?p=586","title":{"rendered":"MongoDB\u57fa\u672c\u4f7f\u7528\uff08\u8f6c\u8f7d\uff09"},"content":{"rendered":"\n

\u6210\u529f\u542f\u52a8MongoDB\u540e\uff0c\u518d\u6253\u5f00\u4e00\u4e2a\u547d\u4ee4\u884c\u7a97\u53e3\u8f93\u5165mongo\uff0c\u5c31\u53ef\u4ee5\u8fdb\u884c\u6570\u636e\u5e93\u7684\u4e00\u4e9b\u64cd\u4f5c\u3002\u8f93\u5165help\u53ef\u4ee5\u770b\u5230\u57fa\u672c\u64cd\u4f5c\u547d\u4ee4\uff1a<\/p>\n\n\n\n

show dbs:\u663e\u793a\u6570\u636e\u5e93\u5217\u8868
show collections\uff1a\u663e\u793a\u5f53\u524d\u6570\u636e\u5e93\u4e2d\u7684\u96c6\u5408\uff08\u7c7b\u4f3c\u5173\u7cfb\u6570\u636e\u5e93\u4e2d\u7684\u8868\uff09
show users\uff1a\u663e\u793a\u7528\u6237<\/p>\n\n\n\n

use <db name>\uff1a\u5207\u6362\u5f53\u524d\u6570\u636e\u5e93\uff0c\u8fd9\u548cMS-SQL\u91cc\u9762\u7684\u610f\u601d\u4e00\u6837
db.help()\uff1a\u663e\u793a\u6570\u636e\u5e93\u64cd\u4f5c\u547d\u4ee4\uff0c\u91cc\u9762\u6709\u5f88\u591a\u7684\u547d\u4ee4
db.foo.help()\uff1a\u663e\u793a\u96c6\u5408\u64cd\u4f5c\u547d\u4ee4\uff0c\u540c\u6837\u6709\u5f88\u591a\u7684\u547d\u4ee4\uff0cfoo\u6307\u7684\u662f\u5f53\u524d\u6570\u636e\u5e93\u4e0b\uff0c\u4e00\u4e2a\u53ebfoo\u7684\u96c6\u5408\uff0c\u5e76\u975e\u771f\u6b63\u610f\u4e49\u4e0a\u7684\u547d\u4ee4
db.foo.find()\uff1a\u5bf9\u4e8e\u5f53\u524d\u6570\u636e\u5e93\u4e2d\u7684foo\u96c6\u5408\u8fdb\u884c\u6570\u636e\u67e5\u627e\uff08\u7531\u4e8e\u6ca1\u6709\u6761\u4ef6\uff0c\u4f1a\u5217\u51fa\u6240\u6709\u6570\u636e\uff09
db.foo.find( { a : 1 } )\uff1a\u5bf9\u4e8e\u5f53\u524d\u6570\u636e\u5e93\u4e2d\u7684foo\u96c6\u5408\u8fdb\u884c\u67e5\u627e\uff0c\u6761\u4ef6\u662f\u6570\u636e\u4e2d\u6709\u4e00\u4e2a\u5c5e\u6027\u53eba\uff0c\u4e14a\u7684\u503c\u4e3a1<\/p>\n\n\n\n

MongoDB\u6ca1\u6709\u521b\u5efa\u6570\u636e\u5e93\u7684\u547d\u4ee4\uff0c\u4f46\u6709\u7c7b\u4f3c\u7684\u547d\u4ee4\u3002<\/p>\n\n\n\n

\u5982\uff1a\u5982\u679c\u4f60\u60f3\u521b\u5efa\u4e00\u4e2a\u201cmyTest\u201d\u7684\u6570\u636e\u5e93\uff0c\u5148\u8fd0\u884cuse myTest\u547d\u4ee4\uff0c\u4e4b\u540e\u5c31\u505a\u4e00\u4e9b\u64cd\u4f5c\uff08\u5982\uff1adb.createCollection(‘user’)\uff09,\u8fd9\u6837\u5c31\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u540d\u53eb\u201cmyTest\u201d\u7684\u6570\u636e\u5e93\u3002<\/p>\n\n\n\n

\u6570\u636e\u5e93\u5e38\u7528\u547d\u4ee4<\/p>\n\n\n\n

1\u3001Help\u67e5\u770b\u547d\u4ee4\u63d0\u793a<\/p>\n\n\n\n

 help<\/p>\n\n\n\n

  db.help();<\/p>\n\n\n\n

  db.yourColl.help();<\/p>\n\n\n\n

  db.youColl.find().help();<\/p>\n\n\n\n

  rs.help();<\/p>\n\n\n\n

2\u3001\u5207\u6362\/\u521b\u5efa\u6570\u636e\u5e93<\/p>\n\n\n\n

 use yourDB;  \u5f53\u521b\u5efa\u4e00\u4e2a\u96c6\u5408(table)\u7684\u65f6\u5019\u4f1a\u81ea\u52a8\u521b\u5efa\u5f53\u524d\u6570\u636e\u5e93<\/p>\n\n\n\n

3\u3001\u67e5\u8be2\u6240\u6709\u6570\u636e\u5e93<\/p>\n\n\n\n

 show dbs;<\/p>\n\n\n\n

4\u3001\u5220\u9664\u5f53\u524d\u4f7f\u7528\u6570\u636e\u5e93<\/p>\n\n\n\n

 db.dropDatabase();<\/p>\n\n\n\n

5\u3001\u4ece\u6307\u5b9a\u4e3b\u673a\u4e0a\u514b\u9686\u6570\u636e\u5e93<\/p>\n\n\n\n

 db.cloneDatabase(\u201c127.0.0.1\u201d); \u5c06\u6307\u5b9a\u673a\u5668\u4e0a\u7684\u6570\u636e\u5e93\u7684\u6570\u636e\u514b\u9686\u5230\u5f53\u524d\u6570\u636e\u5e93<\/p>\n\n\n\n

6\u3001\u4ece\u6307\u5b9a\u7684\u673a\u5668\u4e0a\u590d\u5236\u6307\u5b9a\u6570\u636e\u5e93\u6570\u636e\u5230\u67d0\u4e2a\u6570\u636e\u5e93<\/p>\n\n\n\n

 db.copyDatabase(“mydb”, “temp”, “127.0.0.1”);\u5c06\u672c\u673a\u7684mydb\u7684\u6570\u636e\u590d\u5236\u5230temp\u6570\u636e\u5e93\u4e2d<\/p>\n\n\n\n

7\u3001\u4fee\u590d\u5f53\u524d\u6570\u636e\u5e93<\/p>\n\n\n\n

 db.repairDatabase();<\/p>\n\n\n\n

8\u3001\u67e5\u770b\u5f53\u524d\u4f7f\u7528\u7684\u6570\u636e\u5e93<\/p>\n\n\n\n

 db.getName();<\/p>\n\n\n\n

 db; db\u548cgetName\u65b9\u6cd5\u662f\u4e00\u6837\u7684\u6548\u679c\uff0c\u90fd\u53ef\u4ee5\u67e5\u8be2\u5f53\u524d\u4f7f\u7528\u7684\u6570\u636e\u5e93<\/p>\n\n\n\n

9\u3001\u663e\u793a\u5f53\u524ddb\u72b6\u6001<\/p>\n\n\n\n

 db.stats();<\/p>\n\n\n\n

10\u3001\u5f53\u524ddb\u7248\u672c<\/p>\n\n\n\n

 db.version();<\/p>\n\n\n\n

11\u3001\u67e5\u770b\u5f53\u524ddb\u7684\u94fe\u63a5\u673a\u5668\u5730\u5740<\/p>\n\n\n\n

 db.getMongo();<\/p>\n\n\n\n

Collection\u805a\u96c6\u96c6\u5408<\/p>\n\n\n\n

1\u3001\u521b\u5efa\u4e00\u4e2a\u805a\u96c6\u96c6\u5408\uff08table\uff09<\/p>\n\n\n\n

 db.createCollection(\u201ccollName\u201d, {size: 20, capped: 5, max: 100});<\/p>\n\n\n\n

2\u3001\u5f97\u5230\u6307\u5b9a\u540d\u79f0\u7684\u805a\u96c6\u96c6\u5408\uff08table\uff09<\/p>\n\n\n\n

 db.getCollection(“account”);<\/p>\n\n\n\n

3\u3001\u5f97\u5230\u5f53\u524ddb\u7684\u6240\u6709\u805a\u96c6\u96c6\u5408<\/p>\n\n\n\n

 db.getCollectionNames();<\/p>\n\n\n\n

4\u3001\u663e\u793a\u5f53\u524ddb\u6240\u6709\u805a\u96c6\u7d22\u5f15\u7684\u72b6\u6001<\/p>\n\n\n\n

 db.printCollectionStats();<\/p>\n\n\n\n

 \u7528\u6237\u76f8\u5173<\/p>\n\n\n\n

1\u3001\u6dfb\u52a0\u4e00\u4e2a\u7528\u6237<\/p>\n\n\n\n

 db.addUser(“name”);<\/p>\n\n\n\n

 db.addUser(“userName”, “pwd123”, true); \u6dfb\u52a0\u7528\u6237\u3001\u8bbe\u7f6e\u5bc6\u7801\u3001\u662f\u5426\u53ea\u8bfb<\/p>\n\n\n\n

2\u3001\u6570\u636e\u5e93\u8ba4\u8bc1\u3001\u5b89\u5168\u6a21\u5f0f<\/p>\n\n\n\n

 db.auth(“userName”, “123123”);<\/p>\n\n\n\n

3\u3001\u663e\u793a\u5f53\u524d\u6240\u6709\u7528\u6237<\/p>\n\n\n\n

 show users;<\/p>\n\n\n\n

4\u3001\u5220\u9664\u7528\u6237<\/p>\n\n\n\n

 db.removeUser(“userName”);\u5176\u4ed61\u3001\u67e5\u8be2\u4e4b\u524d\u7684\u9519\u8bef\u4fe1\u606f db.getPrevError();2\u3001\u6e05\u9664\u9519\u8bef\u8bb0\u5f55 db.resetError(); \u67e5\u770b\u805a\u96c6\u96c6\u5408\u57fa\u672c\u4fe1\u606f<\/p>\n\n\n\n

1\u3001\u67e5\u770b\u5e2e\u52a9  db.yourColl.help();<\/pre>\n\n\n\n
2\u3001\u67e5\u8be2\u5f53\u524d\u96c6\u5408\u7684\u6570\u636e\u6761\u6570  db.yourColl.count();<\/pre>\n\n\n\n
3\u3001\u67e5\u770b\u6570\u636e\u7a7a\u95f4\u5927\u5c0f db.userInfo.dataSize();<\/pre>\n\n\n\n
4\u3001\u5f97\u5230\u5f53\u524d\u805a\u96c6\u96c6\u5408\u6240\u5728\u7684db db.userInfo.getDB();<\/pre>\n\n\n\n
5\u3001\u5f97\u5230\u5f53\u524d\u805a\u96c6\u7684\u72b6\u6001 db.userInfo.stats();<\/pre>\n\n\n\n
6\u3001\u5f97\u5230\u805a\u96c6\u96c6\u5408\u603b\u5927\u5c0f db.userInfo.totalSize();<\/pre>\n\n\n\n
7\u3001\u805a\u96c6\u96c6\u5408\u50a8\u5b58\u7a7a\u95f4\u5927\u5c0f db.userInfo.storageSize();<\/pre>\n\n\n\n
8\u3001Shard\u7248\u672c\u4fe1\u606f  db.userInfo.getShardVersion()<\/pre>\n\n\n\n
9\u3001\u805a\u96c6\u96c6\u5408\u91cd\u547d\u540d db.userInfo.renameCollection(\"users\"); \u5c06userInfo\u91cd\u547d\u540d\u4e3ausers<\/pre>\n\n\n\n
10\u3001\u5220\u9664\u5f53\u524d\u805a\u96c6\u96c6\u5408 db.userInfo.drop();<\/pre>\n\n\n\n
\u805a\u96c6\u96c6\u5408\u67e5\u8be2<\/p>\n\n\n\n
1\u3001\u67e5\u8be2\u6240\u6709\u8bb0\u5f55<\/pre>\n\n\n\n
db.userInfo.find();<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aselect* from userInfo;<\/pre>\n\n\n\n
\u9ed8\u8ba4\u6bcf\u9875\u663e\u793a20\u6761\u8bb0\u5f55\uff0c\u5f53\u663e\u793a\u4e0d\u4e0b\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u7528it\u8fed\u4ee3\u547d\u4ee4\u67e5\u8be2\u4e0b\u4e00\u9875\u6570\u636e\u3002\u6ce8\u610f\uff1a\u952e\u5165it\u547d\u4ee4\u4e0d\u80fd\u5e26\u201c\uff1b\u201d<\/pre>\n\n\n\n
\u4f46\u662f\u4f60\u53ef\u4ee5\u8bbe\u7f6e\u6bcf\u9875\u663e\u793a\u6570\u636e\u7684\u5927\u5c0f\uff0c\u7528DBQuery.shellBatchSize= 50;\u8fd9\u6837\u6bcf\u9875\u5c31\u663e\u793a50\u6761\u8bb0\u5f55\u4e86\u3002<\/pre>\n\n\n\n
2\u3001\u67e5\u8be2\u53bb\u6389\u540e\u7684\u5f53\u524d\u805a\u96c6\u96c6\u5408\u4e2d\u7684\u67d0\u5217\u7684\u91cd\u590d\u6570\u636e<\/pre>\n\n\n\n
db.userInfo.distinct(\"name\");<\/pre>\n\n\n\n
\u4f1a\u8fc7\u6ee4\u6389name\u4e2d\u7684\u76f8\u540c\u6570\u636e<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aselect distict name from userInfo;<\/pre>\n\n\n\n
3\u3001\u67e5\u8be2age = 22\u7684\u8bb0\u5f55<\/pre>\n\n\n\n
db.userInfo.find({\"age\": 22});<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1a select * from userInfo where age = 22;<\/pre>\n\n\n\n
4\u3001\u67e5\u8be2age > 22\u7684\u8bb0\u5f55<\/pre>\n\n\n\n
db.userInfo.find({age: {$gt: 22}});<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aselect * from userInfo where age >22;<\/pre>\n\n\n\n
5\u3001\u67e5\u8be2age < 22\u7684\u8bb0\u5f55<\/pre>\n\n\n\n
db.userInfo.find({age: {$lt: 22}});<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aselect * from userInfo where age <22;<\/pre>\n\n\n\n
6\u3001\u67e5\u8be2age >= 25\u7684\u8bb0\u5f55<\/pre>\n\n\n\n
db.userInfo.find({age: {$gte: 25}});<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aselect * from userInfo where age >= 25;<\/pre>\n\n\n\n
7\u3001\u67e5\u8be2age <= 25\u7684\u8bb0\u5f55<\/pre>\n\n\n\n
db.userInfo.find({age: {$lte: 25}});<\/pre>\n\n\n\n
8\u3001\u67e5\u8be2age >= 23 \u5e76\u4e14 age <= 26<\/pre>\n\n\n\n
db.userInfo.find({age: {$gte: 23, $lte: 26}});<\/pre>\n\n\n\n
9\u3001\u67e5\u8be2name\u4e2d\u5305\u542b mongo\u7684\u6570\u636e<\/pre>\n\n\n\n
db.userInfo.find({name: \/mongo\/});<\/pre>\n\n\n\n
\/\/\u76f8\u5f53\u4e8e%%<\/pre>\n\n\n\n
select * from userInfo where name like \u2018%mongo%\u2019;<\/pre>\n\n\n\n
10\u3001\u67e5\u8be2name\u4e2d\u4ee5mongo\u5f00\u5934\u7684<\/pre>\n\n\n\n
db.userInfo.find({name: \/^mongo\/});<\/pre>\n\n\n\n
select * from userInfo where name like \u2018mongo%\u2019;<\/pre>\n\n\n\n
11\u3001\u67e5\u8be2\u6307\u5b9a\u5217name\u3001age\u6570\u636e<\/pre>\n\n\n\n
db.userInfo.find({}, {name: 1, age: 1});<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aselect name, age from userInfo;<\/pre>\n\n\n\n
\u5f53\u7136name\u4e5f\u53ef\u4ee5\u7528true\u6216false,\u5f53\u7528ture\u7684\u60c5\u51b5\u4e0b\u6cb3name:1\u6548\u679c\u4e00\u6837\uff0c\u5982\u679c\u7528false\u5c31\u662f\u6392\u9664name\uff0c\u663e\u793aname\u4ee5\u5916\u7684\u5217\u4fe1\u606f\u3002<\/pre>\n\n\n\n
12\u3001\u67e5\u8be2\u6307\u5b9a\u5217name\u3001age\u6570\u636e, age > 25<\/pre>\n\n\n\n
db.userInfo.find({age: {$gt: 25}}, {name: 1, age: 1});<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aselect name, age from userInfo where age >25;<\/pre>\n\n\n\n
13\u3001\u6309\u7167\u5e74\u9f84\u6392\u5e8f<\/pre>\n\n\n\n
\u5347\u5e8f\uff1adb.userInfo.find().sort({age: 1});<\/pre>\n\n\n\n
\u964d\u5e8f\uff1adb.userInfo.find().sort({age: -1});<\/pre>\n\n\n\n
14\u3001\u67e5\u8be2name = zhangsan, age = 22\u7684\u6570\u636e<\/pre>\n\n\n\n
db.userInfo.find({name: 'zhangsan', age: 22});<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aselect * from userInfo where name = \u2018zhangsan\u2019 and age = \u201822\u2019;<\/pre>\n\n\n\n
15\u3001\u67e5\u8be2\u524d5\u6761\u6570\u636e<\/pre>\n\n\n\n
db.userInfo.find().limit(5);<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aselecttop 5 * from userInfo;<\/pre>\n\n\n\n
16\u3001\u67e5\u8be210\u6761\u4ee5\u540e\u7684\u6570\u636e<\/pre>\n\n\n\n
db.userInfo.find().skip(10);<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aselect * from userInfo where id not in (<\/pre>\n\n\n\n
selecttop 10 * from userInfo<\/pre>\n\n\n\n
);<\/pre>\n\n\n\n
17\u3001\u67e5\u8be2\u57285-10\u4e4b\u95f4\u7684\u6570\u636e<\/pre>\n\n\n\n
db.userInfo.find().limit(10).skip(5);<\/pre>\n\n\n\n
\u53ef\u7528\u4e8e\u5206\u9875\uff0climit\u662fpageSize\uff0cskip\u662f\u7b2c\u51e0\u9875*pageSize<\/pre>\n\n\n\n
18\u3001or\u4e0e \u67e5\u8be2<\/pre>\n\n\n\n
db.userInfo.find({$or: [{age: 22}, {age: 25}]});<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aselect * from userInfo where age = 22 or age = 25;<\/pre>\n\n\n\n
19\u3001\u67e5\u8be2\u7b2c\u4e00\u6761\u6570\u636e<\/pre>\n\n\n\n
db.userInfo.findOne();<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aselecttop 1 * from userInfo;<\/pre>\n\n\n\n
db.userInfo.find().limit(1);<\/pre>\n\n\n\n
20\u3001\u67e5\u8be2\u67d0\u4e2a\u7ed3\u679c\u96c6\u7684\u8bb0\u5f55\u6761\u6570<\/pre>\n\n\n\n
db.userInfo.find({age: {$gte: 25}}).count();<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aselect count(*) from userInfo where age >= 20;<\/pre>\n\n\n\n
21\u3001\u6309\u7167\u67d0\u5217\u8fdb\u884c\u6392\u5e8f<\/pre>\n\n\n\n
db.userInfo.find({sex: {$exists: true}}).count();<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aselect count(sex) from userInfo;<\/pre>\n\n\n\n
\u7d22\u5f15<\/p>\n\n\n\n
1\u3001\u521b\u5efa\u7d22\u5f15<\/pre>\n\n\n\n
db.userInfo.ensureIndex({name: 1});<\/pre>\n\n\n\n
db.userInfo.ensureIndex({name: 1, ts: -1});<\/pre>\n\n\n\n
2\u3001\u67e5\u8be2\u5f53\u524d\u805a\u96c6\u96c6\u5408\u6240\u6709\u7d22\u5f15<\/pre>\n\n\n\n
db.userInfo.getIndexes();<\/pre>\n\n\n\n
3\u3001\u67e5\u770b\u603b\u7d22\u5f15\u8bb0\u5f55\u5927\u5c0f<\/pre>\n\n\n\n
db.userInfo.totalIndexSize();<\/pre>\n\n\n\n
4\u3001\u8bfb\u53d6\u5f53\u524d\u96c6\u5408\u7684\u6240\u6709index\u4fe1\u606f<\/pre>\n\n\n\n
db.users.reIndex();<\/pre>\n\n\n\n
5\u3001\u5220\u9664\u6307\u5b9a\u7d22\u5f15<\/pre>\n\n\n\n
db.users.dropIndex(\"name_1\");<\/pre>\n\n\n\n
6\u3001\u5220\u9664\u6240\u6709\u7d22\u5f15\u7d22\u5f15<\/pre>\n\n\n\n
db.users.dropIndexes();<\/pre>\n\n\n\n
 \u4fee\u6539\u3001\u6dfb\u52a0\u3001\u5220\u9664\u96c6\u5408\u6570\u636e<\/p>\n\n\n\n
1\u3001\u6dfb\u52a0<\/pre>\n\n\n\n
db.users.save({name: \u2018zhangsan\u2019, age: 25, sex: true});<\/pre>\n\n\n\n
\u6dfb\u52a0\u7684\u6570\u636e\u7684\u6570\u636e\u5217\uff0c\u6ca1\u6709\u56fa\u5b9a\uff0c\u6839\u636e\u6dfb\u52a0\u7684\u6570\u636e\u4e3a\u51c6<\/pre>\n\n\n\n
2\u3001\u4fee\u6539<\/pre>\n\n\n\n
db.users.update({age: 25}, {$set: {name: 'changeName'}}, false, true);<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aupdate users set name = \u2018changeName\u2019 where age = 25;<\/pre>\n\n\n\n
db.users.update({name: 'Lisi'}, {$inc: {age: 50}}, false, true);<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aupdate users set age = age + 50 where name = \u2018Lisi\u2019;<\/pre>\n\n\n\n
db.users.update({name: 'Lisi'}, {$inc: {age: 50}, $set: {name: 'hoho'}}, false, true);<\/pre>\n\n\n\n
\u76f8\u5f53\u4e8e\uff1aupdate users set age = age + 50, name = \u2018hoho\u2019 where name = \u2018Lisi\u2019;<\/pre>\n\n\n\n
3\u3001\u5220\u9664<\/pre>\n\n\n\n
db.users.remove({age: 132});<\/pre>\n\n\n\n
4\u3001\u67e5\u8be2\u4fee\u6539\u5220\u9664<\/pre>\n\n\n\n
db.users.findAndModify({<\/pre>\n\n\n\n
    query: {age: {$gte: 25}}, <\/pre>\n\n\n\n
    sort: {age: -1}, <\/pre>\n\n\n\n
    update: {$set: {name: 'a2'}, $inc: {age: 2}},<\/pre>\n\n\n\n
    remove: true<\/pre>\n\n\n\n
});<\/pre>\n\n\n\n
db.runCommand({ findandmodify : \"users\", <\/pre>\n\n\n\n
    query: {age: {$gte: 25}}, <\/pre>\n\n\n\n
    sort: {age: -1}, <\/pre>\n\n\n\n
    update: {$set: {name: 'a2'}, $inc: {age: 2}},<\/pre>\n\n\n\n
    remove: true<\/pre>\n\n\n\n
});<\/pre>\n\n\n\n
update<\/em> \u6216 remove<\/em> \u5176\u4e2d\u4e00\u4e2a\u662f\u5fc5\u987b\u7684\u53c2\u6570; \u5176\u4ed6\u53c2\u6570\u53ef\u9009\u3002<\/pre>\n\n\n\n
\u53c2\u6570<\/strong><\/td>\u8be6\u89e3<\/td>\u9ed8\u8ba4\u503c<\/td><\/tr>
query<\/td>\u67e5\u8be2\u8fc7\u6ee4\u6761\u4ef6<\/td>{}<\/td><\/tr>
sort<\/td>\u7b26\u5408\u67e5\u8be2\u6392\u5e8f<\/td>{}<\/td><\/tr>
remove<\/td>\u82e5\u4e3atrue\uff0c\u88ab\u9009\u4e2d\u5bf9\u8c61\u5c06\u5728\u8fd4\u56de\u524d\u88ab\u5220\u9664<\/td>N\/A<\/td><\/tr>
update<\/td>\u4e00\u4e2a \u4fee\u6539\u5668\u5bf9\u8c61<\/a><\/td>N\/A<\/td><\/tr>
new<\/td>\u82e5\u4e3atrue,\u5c06\u8fd4\u56de\u4fee\u6539\u540e\u7684\u5bf9\u8c61\u800c\u4e0d\u662f\u539f\u59cb\u5bf9\u8c61<\/td>false<\/td><\/tr>
fields<\/td>\u53c2\u89c1Retrieving a Subset of Fields<\/a> (1.5.0+) <\/td>All fields<\/td><\/tr>
upsert<\/td>\u521b\u5efa\u65b0\u5bf9\u8c61\u82e5\u67e5\u8be2\u7ed3\u679c\u4e3a\u7a7a\u3002 \u793a\u4f8b<\/a> (1.5.4+) <\/td>false<\/td><\/tr><\/tbody><\/table>\n\n\n\n
\u8bed\u53e5\u5757\u64cd\u4f5c<\/p>\n\n\n\n
1\u3001\u7b80\u5355Hello World<\/pre>\n\n\n\n
print(\"Hello World!\");<\/pre>\n\n\n\n
\u8fd9\u79cd\u5199\u6cd5\u8c03\u7528\u4e86print\u51fd\u6570\uff0c\u548c\u76f4\u63a5\u5199\u5165\"Hello World!\"\u7684\u6548\u679c\u662f\u4e00\u6837\u7684\uff1b<\/pre>\n\n\n\n
2\u3001\u5c06\u4e00\u4e2a\u5bf9\u8c61\u8f6c\u6362\u6210json<\/pre>\n\n\n\n
tojson(new Object());<\/pre>\n\n\n\n
tojson(new Object('a'));<\/pre>\n\n\n\n
3\u3001\u5faa\u73af\u6dfb\u52a0\u6570\u636e<\/pre>\n\n\n\n
> for (var i = 0; i < 30; i++) {<\/pre>\n\n\n\n
... db.users.save({name: \"u_\" + i, age: 22 + i, sex: i % 2});<\/pre>\n\n\n\n
... };<\/pre>\n\n\n\n
\u8fd9\u6837\u5c31\u5faa\u73af\u6dfb\u52a0\u4e8630\u6761\u6570\u636e\uff0c\u540c\u6837\u4e5f\u53ef\u4ee5\u7701\u7565\u62ec\u53f7\u7684\u5199\u6cd5<\/pre>\n\n\n\n
> for (var i = 0; i < 30; i++) db.users.save({name: \"u_\" + i, age: 22 + i, sex: i % 2});<\/pre>\n\n\n\n
\u4e5f\u662f\u53ef\u4ee5\u7684\uff0c\u5f53\u4f60\u7528db.users.find()\u67e5\u8be2\u7684\u65f6\u5019\uff0c\u663e\u793a\u591a\u6761\u6570\u636e\u800c\u65e0\u6cd5\u4e00\u9875\u663e\u793a\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u7528it\u67e5\u770b\u4e0b\u4e00\u9875\u7684\u4fe1\u606f\uff1b<\/pre>\n\n\n\n
4\u3001find \u6e38\u6807\u67e5\u8be2<\/pre>\n\n\n\n
>var cursor = db.users.find();<\/pre>\n\n\n\n
> while (cursor.hasNext()) { <\/pre>\n\n\n\n
    printjson(cursor.next()); <\/pre>\n\n\n\n
}<\/pre>\n\n\n\n
\u8fd9\u6837\u5c31\u67e5\u8be2\u6240\u6709\u7684users\u4fe1\u606f\uff0c\u540c\u6837\u53ef\u4ee5\u8fd9\u6837\u5199<\/pre>\n\n\n\n
var cursor = db.users.find();<\/pre>\n\n\n\n
while (cursor.hasNext()) { printjson(cursor.next); }<\/pre>\n\n\n\n
\u540c\u6837\u53ef\u4ee5\u7701\u7565{}\u53f7<\/pre>\n\n\n\n
5\u3001forEach\u8fed\u4ee3\u5faa\u73af<\/pre>\n\n\n\n
db.users.find().forEach(printjson);<\/pre>\n\n\n\n
forEach\u4e2d\u5fc5\u987b\u4f20\u9012\u4e00\u4e2a\u51fd\u6570\u6765\u5904\u7406\u6bcf\u6761\u8fed\u4ee3\u7684\u6570\u636e\u4fe1\u606f<\/pre>\n\n\n\n
6\u3001\u5c06find\u6e38\u6807\u5f53\u6570\u7ec4\u5904\u7406<\/pre>\n\n\n\n
var cursor = db.users.find();<\/pre>\n\n\n\n
cursor[4];<\/pre>\n\n\n\n
\u53d6\u5f97\u4e0b\u6807\u7d22\u5f15\u4e3a4\u7684\u90a3\u6761\u6570\u636e<\/pre>\n\n\n\n
\u65e2\u7136\u53ef\u4ee5\u5f53\u505a\u6570\u7ec4\u5904\u7406\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u83b7\u5f97\u5b83\u7684\u957f\u5ea6\uff1acursor.length();\u6216\u8005cursor.count();<\/pre>\n\n\n\n
\u90a3\u6837\u6211\u4eec\u4e5f\u53ef\u4ee5\u7528\u5faa\u73af\u663e\u793a\u6570\u636e<\/pre>\n\n\n\n
for (var i = 0, len = c.length(); i < len; i++) printjson(c[i]);<\/pre>\n\n\n\n
7\u3001\u5c06find\u6e38\u6807\u8f6c\u6362\u6210\u6570\u7ec4<\/pre>\n\n\n\n
> var arr = db.users.find().toArray();<\/pre>\n\n\n\n
> printjson(arr[2]);<\/pre>\n\n\n\n
\u7528toArray\u65b9\u6cd5\u5c06\u5176\u8f6c\u6362\u4e3a\u6570\u7ec4<\/pre>\n\n\n\n
8\u3001\u5b9a\u5236\u6211\u4eec\u81ea\u5df1\u7684\u67e5\u8be2\u7ed3\u679c<\/pre>\n\n\n\n
\u53ea\u663e\u793aage <= 28\u7684\u5e76\u4e14\u53ea\u663e\u793aage\u8fd9\u5217\u6570\u636e<\/pre>\n\n\n\n
db.users.find({age: {$lte: 28}}, {age: 1}).forEach(printjson);<\/pre>\n\n\n\n
db.users.find({age: {$lte: 28}}, {age: true}).forEach(printjson);<\/pre>\n\n\n\n
\u6392\u9664age\u7684\u5217<\/pre>\n\n\n\n
db.users.find({age: {$lte: 28}}, {age: false}).forEach(printjson);<\/pre>\n\n\n\n
9\u3001forEach\u4f20\u9012\u51fd\u6570\u663e\u793a\u4fe1\u606f<\/pre>\n\n\n\n
db.things.find({x:4}).forEach(function(x) {print(tojson(x));});<\/pre>\n","protected":false},"excerpt":{"rendered":"
\u6210\u529f\u542f\u52a8MongoDB\u540e\uff0c\u518d\u6253\u5f00\u4e00\u4e2a\u547d\u4ee4\u884c\u7a97\u53e3\u8f93\u5165mongo\uff0c\u5c31\u53ef\u4ee5\u8fdb\u884c\u6570\u636e\u5e93\u7684 … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[],"class_list":["post-586","post","type-post","status-publish","format-standard","hentry","category-mongodb"],"_links":{"self":[{"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/posts\/586","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=586"}],"version-history":[{"count":3,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/posts\/586\/revisions"}],"predecessor-version":[{"id":590,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/posts\/586\/revisions\/590"}],"wp:attachment":[{"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=586"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=586"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=586"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}