mongodb
MongoDB's NumberLong only 54 bit signed?
Is a MongoDB\'s NumberLong really 64 bit signed integer really 64 bit? MongoDB\'s NumberLong is said to be a 64 bit signed integer, which should mean we can play with -2^开发者_运维问答63 <= x <[详细]
2023-04-13 09:54 分类：问答How does MongoEngine handle Indexes (creation, update, removal)?
Best practice question about setting Mongo indexes.Mongoengine, the Python ORM wrapper, allows you to set indexes in the Document meta class.[详细]
2023-04-13 09:03 分类：问答-
关于MongoDB数据库核心概念
目录MongoDB数据库核心概念1.NoSQL数据库介绍2.MongoDB数据库介绍3.MongoDB支持的数据格式3.1.jsON格式的数据类型3.2.BSON格式4.MongoDB数据库的特性5.MongoDB程序6.MongoDB应用场景MongoDB数据库核心概念[详细]
2023-04-13 09:01 分类：数据库 How do I update/set/unset a key in embedded document/array in MongoDB?
I am trying to unset all values in a document that\'s embedded in an array. Let\'s say I have a collection coll with array things,开发者_开发技巧 containing a value myval. I want to unset myval.This l[详细]
2023-04-13 09:00 分类：问答Indexing of Object keys in MongoDB
I have this structure { \"_id\": \"willwill\", \"rental\": { \"hitchhikergalaxy\": {[...]}, \"animalfarm\": {[..]}[详细]
2023-04-13 08:36 分类：问答MongoDB incremental mapReduce, select only new documents, added after last mapReduce
Let\'s say I have a collection with documents that looks like this (just simplified example, but it should show the scheme):[详细]
2023-04-13 08:12 分类：问答not able to insert with safe turned on in pymongo
The following code runs w/o problems. collection.insert(file_cont) The following code runs w problems as follows:[详细]
2023-04-13 06:53 分类：问答Running both MongoDB and Mysql on Rails 2.3.6
In Rails 2.3.6 I\'m trying to use both MongoDb via MongoMapper and Mysql on the same application. I\'ve seen several others question about this but I cannot find how to configure rails to use bo开发者[详细]
2023-04-13 06:41 分类：问答Adviced on how to array a mongodb document
I am building an API using Codeigniter and MongoDB. I got some questions about how to \"model\" the mongoDB.[详细]
2023-04-13 06:30 分类：问答Updating attributes on several indexes in array. Using mongoid in Rails 3
Inside my test database, I would like to trigger a \"new_item\" flag for testing.The method already works in my tests.So now I am setting the created_at and published_at fields of all records to 1 mon[详细]
2023-04-13 06:02 分类：问答
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