猫鼬游标batchSize [英] mongoose cursor batchSize

问题描述

在定义batchSize的情况下，如何迭代游标批处理文档? 例如，当batchSize定义为等于50时，有什么方法可以迭代50个子文档?

how to iterate the cursor batch documents in case that the batchSize is defined ? example, when the batchSize defined to be equal to 50 , is there any way to iterate that 50 sub documents ?

var myCursor = collection.find().cursor({batchSize:50});
mycursor('on',function(doc){

})

推荐答案

尝试一下:

var myCursor = collection.find({}).cursor({batchSize:50});
myCursor.eachAsync((doc) => {
   ...
});

批处理大小仅用于性能优化，不会为您提供50个对象的批处理.

Batch sizes are just for performance optimisation and will not give you a 50 object chunk.

您仍然必须分别处理每个文档.

You will still have to process each doc individually.

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