mongodb更新器
时间：2021-07-01 10:21:17
帮助过：25人阅读
if an update results
in an insert of a document. Has no effect on update operations that modify existing documents.
$set Sets the value of a field in a document.
$unset Removes the specified field from a document.
$min Only updates the field if the specified value is
less than the existing field value.
$max Only updates the field if the specified value is greater than the existing field value.
$currentDate Sets the value of a field to current date, either as a Date or a Timestamp.
https://docs.mongodb.com/manual/reference/operator/update-field/
mongodb更新器
标签：tip ref pre des manual modify log mongo name
