是否有另一种方法可以对属于多个 Collections 的多个文档执行一组写操作?
在多个 文档 中像官方文档一样对批处理写入进行排序。
Transactions and batched writes on FireStore Docs
对于实例;
WriteBatch batch = db.batch();
// Set the value of 'NYC' in 'cities' collection
DocumentReference nycRef = db.collection("cities").document("NYC");
batch.set(nycRef, map1);
// Set the value of 'ABC' in 'SomeOtherCollection' collection
DocumentReference otherRef = db.collection("SomeOtherCollection").document("ABC");
batch.set(otherRef,map2));
有可能在不同集合上执行批量写入吗?
答案 0 :(得分:1)
批处理操作可以跨集合进行。来自documentation on batched writes:
// Get a new write batch WriteBatch batch = db.batch(); // Set the value of 'NYC' DocumentReference nycRef = db.collection("cities").document("NYC"); batch.set(nycRef, new City()); // Update the population of 'SF' DocumentReference sfRef = db.collection("cities").document("SF"); batch.update(sfRef, "population", 1000000L); // Delete the city 'LA' DocumentReference laRef = db.collection("cities").document("LA"); batch.delete(laRef); // Commit the batch batch.commit().addOnCompleteListener(new OnCompleteListener<Void>() { @Override public void onComplete(@NonNull Task<Void> task) { // ... } });
由于您传递了要写入batch.set()
的文档,因此您也可以将文档从不同的集合传递给每个调用。