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mongodb: insert if not exists
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Sounds like you want to do an "upsert". MongoDB has built-in support for this. Pass an extra...
How to delete last character in a string in C#?
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Mathematical functions in Swift
... easily discover your playground platform by opening File Inspector (⌥⌘1).
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JavaScript - get the first day of the week from current date
...he fastest way to get the first day of the week. For example: today is the 11th of November, and a Thursday; and I want the first day of this week, which is the 8th of November, and a Monday. I need the fastest method for MongoDB map function, any ideas?
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Can I make 'git diff' only the line numbers AND changed file names?
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ZeroMQ的学习和研究（PHP代码实例） - C/C++ - 清泛网 - 专注C/C++及内核技术
...息通信。几年的竞争下来，Apache 基金会旗下的符合 AMQP/1.0标准的 RabbitMQ 已经得到了广泛的认可，成为领先的 MQ 项目。
与 RabbitMQ 相比，ZMQ 并不像是一个传统意义上的消息队列服务器，事实上，它也根本不是一个服务器，它更...
How to pause a YouTube player when hiding the iframe?
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Add a column to a table, if it does not already exist
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edited May 2 '18 at 9:22
Jitendra Pancholi
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