his error occurs when fetching data from a specific bucket about bolthold HOT 8 CLOSED

var bucket is only valid inside your Bolt().Update func.

https://godoc.org/github.com/etcd-io/bbolt#Tx.Bucket

You can't reference it outside of that transaction.

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but,i want get data,What i need to do

from bolthold.

You don't need to create the buckets manually.

Just insert your model:

store, err := bolthold.Open(filename, 0666, nil)
if err != nil {
	//handle error
}
err = store.Insert("king", &modeluserModel{
	UserName:    "king",
	Password: "2959802013_",
})

dwedw := &model.UserModel{}
_ = store.Get("king", dwedw)
fmt.Println(dwedw)

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When I have a default bucket, when I want to have a second bucket, should I innovate to create a store instance?

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I'm not exactly following what you mean, but if you want to manually create and manage buckets, then I wouldn't suggest using Bolthold. Bolthold creates and manages it's own buckets based on the name of the type.

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I have two types of data with different data structures, how to put them in the default bucket of Bolthold

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Bolthold automatically creates a bucket for each type you put in. Use a new type and you get a new bucket.

If you really need to store two different types in the same bucket you can use an anonymous struct and combine the two.

struct {
  Type1
  Type2
}

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This seems to be a good solution

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