The update and delete methods provided by mongoDB include operations on a document in the collection (similar to limit 1), as well as operations on multiple doucuments in the collection, and also support blukUpdate (this is a bit like the blukUpdate provided by hibernateTemplate or jdbcTemplate)
UPDATE OPERATION:
1.updateOne
db.class.updateOne({
filterProp:{$lt:filterVal}
},{
$set : {setProp:setVal}
})
equal
update class set setProp=setVal
where filterProp < filterVal
limit 1
Just modify the update information of a hit data
Well, I was wrong, my version does not support updateOne, only update
2.updateMany
db.class.updateMany({
filterProp:{$lt:filterVal}
},{
$set : {setProp:setVal}
})
equal
update class set setProp=setVal
where filterProp < filterVal
3.replaceOne (I am experimenting with a lower version of mongoDB)
replaceOne is actually the same as the update in my texture, and the difference from updateOne is:
updateOne is to replace the value of a prop in the document
replaceOne is to replace the satisfied document with the following collection
DELETE OPERATION:
1.deleteOne
Below is an excerpt from API
The following diagram highlights the components of the MongoDB deleteOne() operation:
The following diagram shows the same query in SQL:
2.deleteMany
The following diagram highlights the components of the MongoDB deleteMany() operation:
The following diagram shows the same query in SQL:
3.remove
The difference between remove and deleteOne:
No difference has been found so far. . . . //TODO to be added
bulkWrite: (new function in version 3.2)
It is to combine the corresponding update behavior into a jsonArray to take effect at one time.
db.collection.bulkWrite(
[
{ insertOne : { "document" : { name : "sue", age : 26 } } },
{ insertOne : { "document" : { name : "joe", age : 24 } } },
{ insertOne : { "document" : { name : "ann", age : 25 } } },
{ insertOne : { "document" : { name : "bob", age : 27 } } },
{ updateMany: {
"filter" : { age : { $gt : 25} },
"update" : { $set : { "status" : "enrolled" } }
}
},
{ deleteMany : { "filter" : { "status" : { $exists : true } } } }
]
)