大约有 47,000 项符合查询结果（耗时：0.0465秒） [XML]
Recommended SQL database design for tags or tagging [closed]
...ries which you will do: Output all Tags for one Item, draw a Tag-Cloud and select all items for one Tag Title.
All Tags for one Item:
3-Table:
SELECT Tag.Title
FROM Tag
JOIN ItemTag ON Tag.TagID = ItemTag.TagID
WHERE ItemTag.ItemID = :id
2-Table:
SELECT Tag.Title
FROM Tag
WHERE Tag.Item...
How do I import a specific version of a package using go get?
coming from a Node environment I used to install a specific version of a vendor lib into the project folder ( node_modules ) by telling npm to install that version of that lib from the package.json or even directly from the console, like so:
...
Is Tomcat running?
...
To learn what the value of $CATALINA_PID is from your OS-installed Tomcat, try: ps aewwx | grep CATALINA_PID and you will find it in the output for the running process, amongst the other environment variables. In Debian 8 this value is: CATALINA_PID=/var/run/tomcat...
Pycharm: run only part of my Python file
... easier way.
go to File -> Settings -> Keymap
Search for Execute Selection in Console and reassign it to a new shortcut, like Crl + Enter.
This is the same shortcut to the same action in Spyder and R-Studio.
sha...
Windows can't find the file on subprocess.call()
...uld type:
import subprocess
subprocess.call('dir', shell=True)
To quote from the documentation:
The only time you need to specify shell=True on Windows is when the command you wish to execute is built into the shell (e.g. dir or copy). You do not need shell=True to run a batch file or console...
What's the difference between a temp table and table variable in SQL Server?
...-unique indexes too.
Table variables don't participate in transactions and SELECTs are implicitly with NOLOCK. The transaction behaviour can be very helpful, for instance if you want to ROLLBACK midway through a procedure then table variables populated during that transaction will still be populated...
XPath to select Element by attribute value
...he parts in [ ]) shouldn't have slashes immediately before them. Also, to select the Employee element itself, you should leave off the /text() at the end or otherwise you'd just be selecting the whitespace text values immediately under the Employee element.
//Employee[@id='4']
Edit: As Jens poin...
What is LINQ and what does it do? [closed]
...;string> result =
from c in myCustomers
where c.Name.StartsWith("B")
select c.Name;
Lambda Expressions - This is a shorthand for specifying a method. The C# compiler will translate each into either an anonymous method or a true System.Linq.Expressions.Expression. You really need to understand...
How do I check if a Sql server string is null or empty
...
I think this:
SELECT
ISNULL(NULLIF(listing.Offer_Text, ''), company.Offer_Text) AS Offer_Text
FROM ...
is the most elegant solution.
And to break it down a bit in pseudo code:
// a) NULLIF:
if (listing.Offer_Text == '')
temp := nu...
Generate JSON string from NSDictionary in iOS
...5.0 and Mac OS X 10.7. See NSJSONSerialization.
To generate a JSON string from a NSDictionary or NSArray, you do not need to import any third party framework anymore.
Here is how to do it:
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dictionaryOrArrayToOutput
...