在https://github.com/go-sql-driver/mysql 可以看到关于go的连接池和超时相关的信息如下： Connection pool and timeouts The connection pool is managed by Go's database/sql package. For details on how to configure the size of the pool and how long connections stay in the pool see DB.SetMaxOpenConns,DB.SetMaxIdleConns, and *DB.SetConnMaxLifetime in the database/sql documentation. The read, write, and dial timeouts for each individual connection are configured with the DSN parameters readTimeout, writeTimeout, and timeout, respectively

对上述上述三个方法测试验证有效
测试代码如下（部分）：
片段一：

var err error
My, err = sql.Open("mysql", "root:@tcp(127.0.0.1:3306)/test?parseTime=true")
if err != nil {
    log.Fatal(err.Error())
}
err = My.Ping()
if err != nil {
    log.Fatal(err.Error())
}
// Connection pool and timeouts
// 连接池 和 超时
My.SetMaxOpenConns(20)                  // 最大打开连接数
My.SetMaxIdleConns(10)                  // 最大空闲连接数
//My.SetConnMaxLifetime(time.Second * 10) // 连接过期时间; 如果不设置 连接会一直不释放

片段二：

func (p *Person) GetAll() (persons []Person, err error) {
    persons = make([]Person, 0)
    rows, err := db.My.Query("SELECT id, firstname, lastname FROM person")
    defer rows.Close()
    if err != nil {
        return
    }
    time.Sleep(time.Second * 5) //**测试连接池效果 保持db连接不释放**
    for rows.Next() {
        var person Person
        rows.Scan(&person.Id, &person.FirstName, &person.LastName)
        persons = append(persons, person)
    }
    if err = rows.Err(); err != nil {
        return
    }
    return
}

开始测试：
for ((i=0;i<1000;i++)) do curl http://127.0.0.1:10086/person/all & done
netstat -anp | findstr 3306 > 1.txt // windows
测试结果：

go