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App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
...wVersion)
This event fires when the database is downgraded. The previous and new version numbers are provided. Use this event to modify the database as required by the version change.
DatabaseOpened()
当数据库打开时，会触发此事件。
DatabaseUpgrade(oldVersion,newVersion)
This...
Why does the JavaScript need to start with “;”?
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I would say since scripts are often concatenated and minified/compressed/sent together there's a chance the last guy had something like:
return {
'var':'value'
}
at the end of the last script without a ; on the end. If you have a ; at the start on yours, it's safe, e...
How to remove a field completely from a MongoDB document?
...y the question has a bounty (I thought that the question has a nice answer and there is nothing to add), but then I noticed that the answer which was accepted and upvoted 15 times was actually wrong!
Yes, you have to use $unset operator, but this unset is going to remove the words key which does no...
How to select first parent DIV using jQuery?
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parents("div") is traversing and returns all the parent div's you should use .eq(0) after it to make sure it returns just the one you want
– meo
Aug 17 '11 at 7:44
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How do I test for an empty string in a Bash case statement?
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The case statement uses globs, not regexes, and insists on exact matches.
So the empty string is written, as usual, as "" or '':
case "$command" in
"") do_empty ;;
something) do_something ;;
prefix*) do_prefix ;;
*) do_other ;;
esac
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Populating a razor dropdownlist from a List in MVC
...ttribute
Inside the controller create a method to get your UserRole list and transform it into the form that will be presented in the view.
Controller:
private IEnumerable<SelectListItem> GetRoles()
{
var dbUserRoles = new DbUserRoles();
var roles = dbUserRoles
.Get...
How to `go test` all tests in my project?
The go test command covers *_test.go files in only one dir.
3 Answers
3
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Rails - Validate Presence Of Association?
...ccepts_nested_attributes_for with :allow_destroy => true: Nested models and parent validation. In this topic you can find solution.
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Showing a Spring transaction in log
...work.orm.jpa=INFO
(this is the package of the your transaction manager), and also
log4j.logger.org.springframework.transaction=INFO
If INFO isn't enough, use DEBUG
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Listview Scroll to the end of the list after updating the list
...ing post(Runnable) on the view, you ensure the Runnable code is run on the android UI thread. Generally do it this way unless you know you're already on the UI thread, or are ensuring that by some other means.
– Mason Lee
Feb 19 '14 at 0:14
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