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Mongo DB Document Update - Coggle Diagram
Mongo DB Document Update
updateOne({<filter>},{<update>})
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<update>
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2) "$inc" can be used only on values of type integer, long, double, or decimal. If it is used on any other type of value, it will fail.
1) The "$inc" operator can be used to change the value for an existing key or to create a new key if it does not already exist.
{ $currentDate: { <field1>: <typeSpecification1>, ... } }
<typeSpecification> can be either:
1) a boolean true to set the field value to the current date as a Date
2) a document { $type: "timestamp" } or { $type: "date" } which explicitly specifies the type. The operator is case-sensitive and accepts only the lowercase "timestamp" or the lowercase "date".
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When renaming a field and the existing field name refers to a field that does not exist, the $rename operator does nothing.
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replaceOne({<filter>},{<replacement>})
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A common mistake is matching more than one document with the criteria and then creating a duplicate "_id" value with the second parameter.
updateMany({<filter>},{<update>})
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Atomic
If two updates happen at the same time, whichever
one reaches the server first will be applied, and then the next one will be applied.
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