在Firestore交易中更新同一文档的多个字段时的定价 [英] Pricing when updating more than one field of the same document within a Firestore transaction
问题描述
我使用Firestore进行以下交易:
I have the following transaction using Firestore:
mDb.runTransaction(new Transaction.Function<Void>() {
@Override
public Void apply(final Transaction transaction) throws FirebaseFirestoreException {
DocumentReference documentReference = mDb.collection("collectionOne").document("documentOne");
/*
some code
*/
transaction.update(documentReference, App.getResourses().getString(R.string.field_one), FieldValue.increment(1));
transaction.update(documentReference, App.getResourses().getString(R.string.field_two), FieldValue.increment(1));
return null;
}
}).addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
Log.d("Debugging", "Transaction correctly executed.");
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Log.w("Debugging", "Transaction failure.", e);
}
});
我的问题是:例如,在同一笔交易中更新同一文档的两个字段时,这样的交易会产生一个或两个文档吗?
My question is: when updating, for example, two fields of the same document within the same transaction, will such a transaction yield to one or two documents reads?
推荐答案
例如,在同一笔交易中更新同一文档的两个字段时,这样的交易会产生一个或两个文档读取吗?
when updating, for example, two fields of the same document within the same transaction, will such a transaction yield to one or two documents reads?
在一个操作中更改一个文档中的多少字段都无关紧要,您始终要承担一个写入操作的费用.如果您一次又一次地进行写操作,则将承担两次写操作的费用.
Doesn't matter how many fields you change in a document in one operation, you'll always be charged with one write operation. If you make the writes, one after the other, you'll be charged with two write operations.
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