Java Operations mongodb--Update data

In Java, you can update a document in a collection by using the Updateone,updatemany,replaceone method. But _id can't be updated.

Updateone only updates a single piece of data, even if multiple data is filtered through filters.lt ("age", 20), and only one is removed for update

Update operator

　　name Description　　　　　　　　

$inc Add a specified value

$mul multiplied by a specified value

$rename renaming

$setOnInsert the update operation has no effect on the existing document, but instead inserts a new document, add the specified field to the newly inserted document

$set Modifying values

$unset Delete a specified field in a document

$min update A field in the document that is less than the specified value

$max update A field in the document that is greater than the specified value

$currentDate set the current time, date, or timestamp

$set

Modifies only the specified field value, and when the field does not exist, adds a new field to the document and assigns a value

Doc.updateone ("Age", "Filters.eq", New Document ("$set", New Document ("Sex", 2222));
finditerable<document> iter1 = Doc.find ();
Iter1.foreach (New block<document> () {
public void Apply (Document _doc) {
System.out.println (_doc.tojson ());
}
});

$inc

Increments the specified field and, when the field does not exist, adds a field to the document and assigns a value

Doc.updateone (Filters.eq ("name", "Zhang San"), New Document ("$inc", New Document ("Age", 10));
Finditerable<document> iter = Doc.find ();
Iter.foreach (New block<document> () {
public void Apply (Document _doc) {
System.out.println (_doc.tojson ());
}
});

$mul

The usage of $mul is similar to that of $inc, the difference is that $mul is multiplied, $inc is added, and if the field does not exist, add a field and assign a value of 0

$rename

Modify the field name of the document

Doc.updateone (Filters.eq ("name", "Zhang San"), New Document ("$rename", New document ("Phone", "Telphone")));
Finditerable<document> iter = Doc.find ();
Iter.foreach (New block<document> () {
public void Apply (Document _doc) {
System.out.println (_doc.tojson ());
}
});

Additional actions to view official documents:

https://docs.mongodb.com/manual/reference/operator/update/

Java Operations mongodb--Update data