大约有 19,000 项符合查询结果（耗时：0.0303秒） [XML]
XDocument or XmlDocument
...urprised none of the answers so far mentions the fact that XmlDocument provides no line information, while XDocument does (through the IXmlLineInfo interface).
This can be a critical feature in some cases (for example if you want to report errors in an XML, or keep track of where elements are defin...
Condition within JOIN or WHERE
...SELECT *
FROM Customers c
INNER JOIN CustomerAccounts ca
ON ca.CustomerID = c.CustomerID
AND c.State = 'NY'
INNER JOIN Accounts a
ON ca.AccountID = a.AccountID
AND a.Status = 1
Write:
SELECT *
FROM Customers c
INNER JOIN CustomerAccounts ca
ON ca.CustomerID = c.CustomerID
INNE...
MySQL Great Circle Distance (Haversine formula)
...o search by kilometers instead of miles, replace 3959 with 6371.
SELECT id, ( 3959 * acos( cos( radians(37) ) * cos( radians( lat ) )
* cos( radians( lng ) - radians(-122) ) + sin( radians(37) ) * sin(radians(lat)) ) ) AS distance
FROM markers
HAVING distance < 25
ORDER BY distance
LIMIT ...
I want to execute shell commands from Maven's pom.xml
...
Here's what's been working for me:
<plugin>
<artifactId>exec-maven-plugin</artifactId>
<groupId>org.codehaus.mojo</groupId>
<executions>
<execution><!-- Run our version calculation script -->
<id>Version Calculation<...
@Html.BeginForm Displaying “System.Web.Mvc.Html.MvcForm” on Page
I have a razor view that I added a delete button to inside of an 'if' statement and when the view is rendered in the browser it is displaying "System.Web.Mvc.Html.MvcForm" next to the delete button.
...
Separation of business logic and data access in django
...cation. Your users will appreciate this :-)
Expressing Commands
Django provides two easy ways of expressing commands; they are both valid options and it is not unusual to mix the two approaches.
The service layer
The service module has already been described by @Hedde. Here you define a separate mod...
How to get process ID of background process?
...
You need to save the PID of the background process at the time you start it:
foo &
FOO_PID=$!
# do other stuff
kill $FOO_PID
You cannot use job control, since that is an interactive feature and tied to a controlling terminal. A script will ...
Select2 doesn't work when embedded in a bootstrap modal
...in bootstrap modal, I can't type anything into it. It's like disabled? Outside the modal select2 works fine.
29 Answers
...
How to change menu item text dynamically in Android
I'm trying to change the title of a menu item from outside of the onOptionsItemSelected(MenuItem item) method.
11 Answers...
What are database normal forms and can you give examples? [closed]
.... Recall that a primary key can be made up of multiple columns. As Chris said in his response:
The data depends on the key [1NF], the whole key [2NF] and nothing but the key [3NF] (so help me Codd).
2NF
Say you have a table containing courses that are taken in a certain semester, and you have the...