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How to add a primary key to a MySQL table?
... will fail.
To add a primary key constraint to an existing column use the form:
ALTER TABLE `goods`
MODIFY COLUMN `id` INT(10) UNSIGNED PRIMARY KEY AUTO_INCREMENT;
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How to save picture to iPhone photo library?
... thing to remember: If you use a callback, make sure that your selector conforms to the following form:
- (void) image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo;
Otherwise, you'll crash with an error such as the following:
[NSInvocation setA...
Do I need Content-Type: application/octet-stream for file download?
...will not open a "file save" window for you if this is your response from a form, regardless of including "Content-Disposition: attachment", even with "application/octet-stream" as the content-type. And then they print a message saying you may be under attack... There is just no way of it letting me ...
How to get NSDate day, month and year in integer format?
I want to get the day, month and year components of NSDate in integer form i.e. if the date is 1/2/1988 then I should get 1, 2 and 1988 separately as an integer. How can I do this in iOS? I found the similar question but the method descriptionWithCalendarFormat : gives a warning and seems to be d...
开源邮件传输代理软件 -- Postfix 介绍 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...道工序
它对新邮件进行以下的处理：添加信头中丢失的Form信息；为将地址重写成标准的user@fully.qualified.domain格式进行排列；重信头中抽出收件人的地址；将邮件投入incoming队列中，并请求邮件队列管理进程处理该邮件；请求tri...
How to list only top level directories in Python?
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os.walk is a generator and calling next will get the first result in the form of a 3-tuple (dirpath, dirnames, filenames). Thus the [1] index returns only the dirnames from that tuple.
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How to send a PUT/DELETE request in jQuery?
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Also, you can't pass in form data. It has to go through the URI.
– xavier
Jun 29 '15 at 19:59
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“inconsistent use of tabs and spaces in indentation”
...dentation is incredibly bad. Never do that ever (except for languages/file formats that require it). The end.
– Lennart Regebro
Jul 26 '11 at 9:28
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Change One Cell's Data in mysql
...because the previous answers were a little bit cryptic to me.
The general form of the command you need to use to update a single row's column:
UPDATE my_table SET my_column='new value' WHERE something='some value';
And here's an example.
BEFORE
mysql> select aet,port from ae;
+------------+...
Understanding REST: Verbs, error codes, and authentication
...retrying this request. For example, "Resource not found" (HTTP 404) or "Malformed Request" (HTTP 400) errors would fall in this category.
Point 4: How to do authentication
As pointed out in point 1, instead of authenticating a user, you may want to think about creating a session. You will be ret...