Go语言中如何处理并发数据库连接的连接池优化问题？

package main

import (
    "database/sql"
    "fmt"
    "sync"

    _ "github.com/go-sql-driver/mysql"
)

var dbPool *sync.Pool

func main() {
    dbPool = &sync.Pool{
        New: func() interface{} {
            db, err := sql.Open("mysql", "username:password@tcp(127.0.0.1:3306)/database")
            if err != nil {
                panic(err)
            }
            return db
        },
    }

    for i := 0; i < 10; i++ {
        go func() {
            db := dbPool.Get().(*sql.DB)
            defer dbPool.Put(db)

            // 对数据库进行操作，例如执行查询操作
            rows, err := db.Query("SELECT * FROM users")
            if err != nil {
                fmt.Println(err)
                return
            }
            defer rows.Close()

            for rows.Next() {
                var id int
                var name string
                err := rows.Scan(&id, &name)
                if err != nil {
                    fmt.Println(err)
                    return
                }
                fmt.Println(id, name)
            }
        }()
    }

    // 等待所有goroutine执行完毕
    wg := sync.WaitGroup{}
    wg.Add(10)
    wg.Wait()
}