英文:
Java MongoDB driver: How to update all Documents in Collection?
问题
以下代码允许我们更新customerDetail集合中customer_user_id为1的所有文档：
db.getCollection("customerDetail")
.updateMany(Filters.eq("customer_user_id", 1),
Updates.combine(
Updates.set("birth_year", "birth_year"),
Updates.set("country", "country")
));
但是我需要更新所有集合中的文档，因此我需要找到一种方法来告诉Java驱动程序不要对更新查询应用任何过滤器，但我可以看到updateMany方法中Filter是一个必需的属性，我不能只传递null。
那么我如何更新所有文档呢？
英文:
The following code allows us to update all documents in customerDetail collection where customer_user_id is 1:
db.getCollection("customerDetail")
.updateMany(Filters.eq("customer_user_id", 1),
Updates.combine(
Updates.set("birth_year", "birth_year"),
Updates.set("country", "country")
));
but I need to update ALL documents in the collection, so I need to find a way how to ask Java Driver do not apply any filters to update query, but as I can see for updateMany method Filter is a mandatory attribute and I can't just pass null.
So how can I update all documents?
答案1
得分: 4
一个我经常使用的选项：
mongoCollectionObject
.updateMany(new Document(), //
new Document("$set",
new Document("birth_year", "birth_year")
.append("country", "country")
));
第一个是条件 - 因为空白等同于 {} - 意味着所有文档。
第二个是要设置给所有匹配文档的文档。
英文:
One option which I use frequently
mongoCollectionObject
.updateMany(new Document(), //
new Document("$set"
new Document("birth_year", "birth_year")
.append("country", "country")
));
First one is the condition - as it is empty - equivalent to {} - means all documents
second one is the document to be set for all matching documents
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