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字符串拼接

1.使用 strings.Builder 做拼接，推荐​

    var dataSource strings.Builder

    var dataSource strings.Builder
    dataSource.WriteString(username)
    dataSource.WriteString(":")
    dataSource.WriteString(password)
    dataSource.WriteString("@(")
    dataSource.WriteString(host)
    dataSource.WriteString(":")
    dataSource.WriteString(strconv.FormatInt(port, 10))
    dataSource.WriteString(")/")
    dataSource.WriteString(database)

    return dataSource.String()