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Add a column to existing table and uniquely number them on MS SQL Server
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It would help if you posted what SQL database you're using. For MySQL you probably want auto_increment:
ALTER TABLE tableName ADD id MEDIUMINT NOT NULL AUTO_INCREMENT KEY
Not sure if this applies the values retroactively though. If it doesn't you should just be able to iterate over you...
How to create a self-signed certificate with OpenSSL
...e a CA)", then said, "5. Install the CA certificate on the client". If the root key became compromised, a malicious person could sign a cert for any domain with that key, and if they trick you into going to their website, they can now do a man-in-the-middle attack. Is there a way to create the root ...
Best way to create custom config options for my Rails app?
...er in config/initializers:
# Rails 2
APP_CONFIG = YAML.load_file("#{RAILS_ROOT}/config/config.yml")[RAILS_ENV]
# Rails 3+
APP_CONFIG = YAML.load_file(Rails.root.join('config/config.yml'))[Rails.env]
If you're using Rails 3, ensure you don't accidentally add a leading slash to your relative confi...
Groovy Shell warning “Could not open/create prefs root node …”
...JDK source code for WindowsPreferences.java. In this class, both nodes userRoot and systemRoot were declared static as in:
/**
* User root node.
*/
static final Preferences userRoot =
new WindowsPreferences(USER_ROOT_NATIVE_HANDLE, WINDOWS_ROOT_PATH);
/**
* System root node.
*/
static fin...
请停下来重新想下 你究竟为何创业？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...扯？这里不应该是创业成功者的鸡汤分享区么？比如你是如何拿到几亿美元的风投，或者起码要秀一下融资的雄心壮志吧？毕竟哪个心智正常的人会花费十几年的时间经营公司，却连想要吞并别人的野心都没有。
唔，我之所以...
Django CharField vs TextField
...nce among these three types", but AFAIK there are some differences in e.g. MySQL, so this is something to keep in mind.
A good rule of thumb is that you use CharField when you need to limit the maximum length, TextField otherwise.
This is not really Django-specific, also.
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How can I create a self-signed cert for localhost?
...cking around, you can do: sudo security add-trusted-cert -p ssl -d -r trustRoot -k ~/Library/Keychains/login.keychain localhost.crt
– philfreo
Apr 8 '16 at 0:50
1
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Remove unnecessary svn:mergeinfo properties
...another way to delete all sub tree svn:mergeinfo properties but not at the root folder (this is needed for branching to work properly).
From the root of the project do:
svn propdel svn:mergeinfo -R
svn revert .
svn ci -m "Removed mergeinfo"
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分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...将是一个灾难性的失败。 这个思维实验就包括考虑他们如何去做这件事情。下面是我们的思考：
1）第一位将军先发送一段消息“让我们在上午9点开始进攻”。然而，一旦信使被派遣，他是否通过了山谷，第一位将军就不得而...
Batch file to delete files older than N days
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I used this syntax on Win Server 2008: forfiles /P "C:\Mysql_backup" /S /M *.sql /D -30 /C "cmd /c del @PATH"
– jman
Apr 18 '11 at 8:42
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