mongos> var it = db.test.find({'i': 1, "old_id": {$exists: 1}}) 遍历计数1:mongos> var count = 0;while(it.hasNext()){if (it.next()["X"].length==32)++count}print(count) 遍历计数2:mongos> var count = 0;while(it.hasNext()){var item = it.next(); if (item['X']...
(3)在返回的数据中,“acknowledged”为“true”表示删除成功,“deletedCount”表示一共删除了1条数据 (4)再次查询example_data_1,发现已经找不到被删除的数据了 提示:慎用删除功能。一般工程上会使用“假删除”,即:在文档里面增加一个字段“deleted”,如果值为0则表示没有删除,如果值为1则表示已经被删除了。默认...
Use deleteOne, deleteMany, findOneAndDelete, or bulkWrite. { acknowledged: true, deletedCount: 1 } 这样我们就把20岁的沙僧给删掉了 这个remove默认就是删除一个对象,看官方文档中: 现在数据库中有两个金角大王,然后,我们需要同时删除这两个 test> db.stus.remove({name:"金角大王"}, false) { ...
以看到数据分到3个分片,各自分片数量为: shard1 “count” : 33273,shard2 “count” : 33377,shard3 “count” : 33350 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35....
$cmd command: createIndexes { createIndexes: "system.sessions", indexes: [ { key: { lastUse: 1 }, name: "lsidTTLIndex", expireAfterSeconds: 1800 } ], $db: "config" } numYields:0 reslen:114 locks:{ Global: { acquireCount: { r: 2, w: 2 } }, Database: { acquireCount: { ...
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NamePathTypeDescription deletedCount deletedCount integer deletedCount Find DocumentOperation ID: FindDocument Using the findOne endpoint will let you retrieve a single document from a collection. Use the filter property in the request body to specify the search criteria. If more than one document mat...
How do you create a database in MongoDB using Python? We use PyMongo driver to create a MongoDB database using Python code. Example: ~~~ import pymongo # Get the mongoclient client = pymongo.MongoClient(CONNECTION_STRING) # Get/Create database dbname = client['user_shopping_list']import...
v1.0.1 修复菜单无法排序问题,数据库插件添加count查询数量方法,并修复插件让数据库插件查询到的数据支持修改。mongoose插件修改之后校验中间件也做了调整。后台添加了数据库的备份与还原功能,以及后台重置密码可用明文输入。保存之后自动进行加密。 Apache License Version 2.0, January 2004 http://www.apache.org/...
To query for documents where a key’s value is not equal to a certain value, you must use another conditional operator, "$ne", which stands for “not equal.” If you want to find all users who do not have the username “joe,” you can query for them using this: > db.users.find...