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How do I automatically update a timestamp in PostgreSQL
...values changed
Based on E.J's link and add a if statement from this link (https://stackoverflow.com/a/3084254/1526023)
CREATE OR REPLACE FUNCTION update_modified_column()
RETURNS TRIGGER AS $$
BEGIN
IF row(NEW.*) IS DISTINCT FROM row(OLD.*) THEN
NEW.modified = now();
RETURN NEW;
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Turn off Chrome/Safari spell checking by HTML/css
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What is the usefulness of PUT and DELETE HTTP request methods?
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How to retrieve Request Payload
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ruby on rails f.select options with custom attributes
...sted about finding this not in the docs, but by reading the rails source. https://web.archive.org/web/20130128223827/http://www.pogodan.com/blog/2011/02/24/custom-html-attributes-in-options-for-select
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CSS selector with period in ID
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How to remove spaces from a string using JavaScript?
...Firefox 26.41, Safari 23.10, Chrome 7.98,
You can run it on your machine: https://jsperf.com/remove-string-spaces/1
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Disable sorting for a particular column in jQuery DataTables
... <td>Tiger Nixon</td>
<td><img src="https://www.gravatar.com/avatar/8edcff60cdcca2ad650758fa524d4990?s=64&amp;d=identicon&amp;r=PG" alt="" style="width: 64px; height: 64px; visibility: visible;"></td>
<td>2011/04/25</td>...
How can I tell PyCharm what type a parameter is expected to be?
...ire.
"""
replicant.knock_over() # Shows a warning.
See: https://www.jetbrains.com/help/pycharm/2016.1/type-hinting-in-pycharm.html#legacy
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MQTT相关知识研究笔记 - 创客硬件开发 - 清泛IT社区，为创新赋能！
1、开源技术选型：
EMQX：https://github.com/emqx/emqx
Mosquitto：https://github.com/eclipse/mosquitto
Mosquitto 不支持分布式集群，但C/C++写的更高效，200KB内存占用，几乎可以运行在一切平台之上，包括树莓派，可以作为小型的消息网关，...