You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mysql.go
    path of file: ./repos/goldfish/vendor/github.com/hashicorp/vault/physical/mysql
    
    the code of the file until where you have to start completion: package mysql

import (
	"crypto/tls"
	"crypto/x509"
	"database/sql"
	"fmt"
	"io/ioutil"
	"net/url"
	"sort"
	"strconv"
	"strings"
	"time"

	log "github.com/mgutz/logxi/v1"

	"github.com/armon/go-metrics"
	mysql "github.com/go-sql-driver/mysql"
	"github.com/hashicorp/errwrap"
	"github.com/hashicorp/vault/helper
    
func (m *MySQLBackend) Get(key string) (*physical.Entry, error) {
	defer metrics.MeasureSince([]string{"mysql", "get"}, time.Now())

	m.permitPool.Acquire()
	defer m.permitPool.Release()

	var result []byte
	err := m.statements["get"].QueryRow(key).Scan(&result)
	if err == sql.ErrNoRows {
		return nil, nil
	}
	if err != nil {
		return nil, err
	}

	ent := &physical.Entry{
		Key:   key,
		Value: result,
	}
	return ent, nil
}