What is the method to obtain a value from LevelDb in Go based on the ending key?

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To obtain a value from LevelDB in Go based on the ending key, you can use the "NewIterator" function to create an iterator object and then use the "Seek" and "Prev" methods to navigate the database and retrieve the appropriate key-value pair.

Here's an example code snippet:

import (
    "fmt"
    "github.com/syndtr/goleveldb/leveldb"
)

func main() {
    db, err := leveldb.OpenFile("./my-db", nil)
    if err != nil {
        panic(err)
    }
    defer db.Close()

    startKey := []byte("my-start-key")
    endKey := []byte("my-end-key")

    iter := db.NewIterator(nil, nil)
    defer iter.Release()

    for iter.Seek(endKey); iter.Prev(); {
        key := iter.Key()
        value := iter.Value()

        if bytes.Compare(key, startKey) >= 0 {
            fmt.Printf("Key: %s, Value: %s\n", key, value)
        } else {
            // We have gone past the start key, exit loop
            break
        }
    }
}

In this example, we first define the start and end keys that we want to search between. We then create an iterator object using the "NewIterator" function on our database. We set the iterator to start at our end key using the "Seek" method, and then we use the "Prev" method to iterate backwards through the database.

For each key-value pair we encounter, we check if the key is greater than or equal to the start key using the "bytes.Compare" function. If it is, we print out the key-value pair. If it is not, we have gone past the start key, so we exit the loop.

Note that we must call "iter.Release()" at the end of the loop to ensure that we release the iterator and free up any resources it was using.