获取MongoDB查询中所有文档的大小？
要获取查询中所有文档的大小，您需要遍历文档。首先让我们创建一个包含文档的集合-
> db.sizeOfAllDocumentsDemo.insertOne({"StudentFirstName":"John","StudentSubject":["MongoDB","Java"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd3c0c1edc6604c74817cd7")
}
> db.sizeOfAllDocumentsDemo.insertOne({"StudentFirstName":"Larry","StudentSubject":["MySQL","PHP"],"StudentAge":21});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd3c0d9edc6604c74817cd8")
}
> db.sizeOfAllDocumentsDemo.insertOne({"StudentFirstName":"Chris","StudentSubject":["SQL Server","C#"],"StudentAge":23,"StudentCountryName":"US"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd3c0fbedc6604c74817cd9")
}以下是在find()方法的帮助下显示集合中所有文档的查询-
> db.sizeOfAllDocumentsDemo.find().pretty();
这将产生以下输出-
{
"_id" : ObjectId("5cd3c0c1edc6604c74817cd7"),
"StudentFirstName" : "John",
"StudentSubject" : [
"MongoDB",
"Java"
]
}
{
"_id" : ObjectId("5cd3c0d9edc6604c74817cd8"),
"StudentFirstName" : "Larry",
"StudentSubject" : [
"MySQL",
"PHP"
],
"StudentAge" : 21
}
{
"_id" : ObjectId("5cd3c0fbedc6604c74817cd9"),
"StudentFirstName" : "Chris",
"StudentSubject" : [
"SQL Server",
"C#"
],
"StudentAge" : 23,
"StudentCountryName" : "US"
}以下是查询以获取查询中所有文档的大小-
> var allDocument = db.sizeOfAllDocumentsDemo.find();
> var counter = 0;
> allDocument.forEach(
... function(myDocument) {
... counter = counter+Object.bsonsize(myDocument)
... }
... );
> print(counter);这将产生以下输出-
358
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