mongodb update
update:update的对象和一些更新的操作符(如$,$inc...)等,也可以理解为sqlupdate查询内set后面的 ...,更新的选择标准。提供与方法中相同的查询选择器find()。当执行update()with且查询不匹配任何现有文档时,如果查询使用点表示法在字段上指定条件,则MongoDB将 ....
Update Documents — MongoDB Shell
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TheMongoDBshellprovidesthefollowingmethodstoupdatedocumentsinacollection:Toupdateasingledocument,usedb.collection.updateOne().
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