大约有 49,000 项符合查询结果（耗时：0.1149秒） [XML]
Why use multiple columns as primary keys (composite primary key)
...
Your understanding is correct.
You would do this in many cases. One example is in a relationship like OrderHeader and OrderDetail. The PK in OrderHeader might be OrderNumber. The PK in OrderDetail might be OrderNumber AND LineNumber. ...
Select element by exact match of its content
... "bold");
It's not a selector, but it does the job. :-)
If you want to handle whitespace before or after the "hello", you might throw a $.trim in there:
return $.trim($(this).text()) === "hello";
For the premature optimizers out there, if you don't care that it doesn't match <p><span&...
How can I create a simple message box in Python?
...
You could use an import and single line code like this:
import ctypes # An included library with Python install.
ctypes.windll.user32.MessageBoxW(0, "Your text", "Your title", 1)
Or define a function (Mbox) like so:
import ctypes # An inclu...
Recent file history in Vim?
I would like to access recent files that I had opened and then closed in GVim. I open and close GVim frequently. I would like to access recent files from previous sessions as well.
...
Should a “static final Logger” be declared in UPPER-CASE?
In Java, static final variables are constants and the convention is that they should be in upper-case. However, I have seen that most people declare loggers in lower-case which comes up as a violation in PMD .
...
Automatic exit from bash shell script on error [duplicate]
I've been writing some shell script and I would find it useful if there was the ability to halt the execution of said shell script if any of the commands failed. See below for an example:
...
Backbone.js: `extend` undefined?
...
Thank you so much, was puzzled what I am doing wrong, and why I can't even load the backbone!
– Victor Farazdagi
Sep 23 '11 at 8:37
22
...
How to create a file in memory for user to download, but not through server?
Is there any way I can create a text file on the client side and prompt the user to download it, without any interaction with the server?
I know I can't write directly to their machine (security and all), but can I create and prompt them to save it?
...
How to change the type of a field?
...
So simply load the document from the DB, perform the cast (new String(x)) and then save the document again.
If you need to do this programmatically and entirely from the shell, you can use the find(...).forEach(function(x) {}) syntax.
In response to the second comment below. Change the field ba...
Quick easy way to migrate SQLite3 to MySQL? [closed]
...
Everyone seems to starts off with a few greps and perl expressions and you sorta kinda get something that works for your particular dataset but you have no idea if it's imported the data correctly or not. I'm seriously surprised nobody's built a solid library that can co...