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ZMQ: 基本原理 - 开源 & Github - 清泛网移动版 - 专注C/C++及内核技术
...输地址协同工作，比如IP地址，而后者仅仅使用处理器（文件描述符）去定位具体的拓扑：
/* Topology establishment */
int s = zmq_socket (...);
zmq_connect (s, "tcp://192.168.0.111:5555");
/* Message routing */
const char data [] = "ABC";
zmq_send (s, data, ...
Writing to an Excel spreadsheet
...ges available (xlwt, XlsXcessive, openpyxl). Others suggest to write to a .csv file (never used CSV and don't really understand what it is).
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How to store a dataframe using Pandas
Right now I'm importing a fairly large CSV as a dataframe every time I run the script. Is there a good solution for keeping that dataframe constantly available in between runs so I don't have to spend all that time waiting for the script to run?
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cannot download, $GOPATH not set
I want to install json2csv using go get github.com/jehiah/json2csv but I receive this error:
15 Answers
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MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...条消息就发送上千条采集的数据，或者比较大的设备阴影文件。技术挑战TCP需要解决的问题是在IP包传输过程中，处理异构网络环境下的网络拥塞、丢包、乱序、重复包等多种问题。MQTT解决的问题是，在低带宽高延迟不可靠的网...
How to create CSV Excel file C#? [closed]
I'm looking for a class for creating CSV Excel files.
13 Answers
13
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invalid byte sequence for encoding “UTF8”
... to help others and the search engines: this works for converting a Stripe CSV export with unreadable characters back into UTF-8: ` iconv -f ISO-8859-15 -t utf-8 customers.csv > customers-utf8.csv`
– sscarduzio
Nov 27 '17 at 21:49
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Import and Export Excel - What is the best library? [closed]
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I'm going to throw my hand in for flat csv files, if only because you've got the greatest control over the code. Just make sure that you read in the rows and process them one at a time (reading the document to the end and splitting will eat up all of your memory -...
plsql 存储过程 事务 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...滚时，oracle会确认事务变化或回滚事务、结束事务、删除保存点、释放锁。
4、提交事务（COMMIT）确认事务变化，结束当前事务、删除保存点，释放锁，使得当前事务中所有未决的数据永久改变。
5、保存点（SAVEPOINT）在当前事...
How to use the CSV MIME-type?
In a web application I am working on, the user can click on a link to a CSV file. There is no header set for the mime-type, so the browser just renders it as text. I would like for this file to be sent as a .csv file, so the user can directly open it with calc, excel, gnumeric, etc.
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