访问mysql数据库，产生大量连接，不信你试试

package main

import (
    "database/sql"
    "fmt"
    _ "github.com/go-sql-driver/mysql"
    "time"
)

func main() {

    db, err := sql.Open("mysql", "root:xxxx@tcp(localhost:3306)/xxxx?charset=utf8")
    checkErr(err)
    defer db.Close()

    err = db.Ping()
    checkErr(err)

    for {
        _, err = db.Query("SELECT 1")
        checkErr(err)

        time.Sleep(1000 * time.Millisecond)
    }

    fmt.Println("over")
}

func checkErr(err error) {
    if err != nil {
        panic(err)
    }
}