Golang bolt 获取值

Question

var value_variable
        // Access data from within a read-only transactional block.
    db.View(func(tx *bolt.Tx) error {
        v := tx.Bucket([]byte("people")).Get([]byte("john"))
        fmt.Printf("John's last name is %s.\n", v)
        return nil
    })

如何给 value_variable 赋值？

Answer 1

因为 Go 是 lexically scoped ，您可以在传递给 View 的函数中分配 value_variable:

var value_variable []byte

// Access data from within a read-only transactional block.
db.View(func(tx *bolt.Tx) error {
    v := tx.Bucket([]byte("people")).Get([]byte("john"))
    value_variable = v // <----- ASSIGN IT HERE
    fmt.Printf("John's last name is %s.\n", v)
    return nil
})