大约有 6,887 项符合查询结果（耗时：0.0182秒） [XML]
SQL how to increase or decrease one for a int column in one command
...need to worry about being stateless.
If you make it stateless, With good indexes, you will not see a diff with the following SQL vs 1 statement.
IF (select top 1 * form x where PK=@ID)
Insert
else
update
share
...
delete_all vs destroy_all?
...he model class.
So instead of :
u = User.find_by_name('JohnBoy')
u.usage_indexes.destroy_all
You can do :
u = User.find_by_name('JohnBoy')
UsageIndex.destroy_all "user_id = #{u.id}"
The result is one query to destroy all the associated records
...
Custom sort function in ng-repeat
...n conjunction with custom filters (since the keys for arrays are numerical indexes), so the template should be updated to reference the injected key names.
<ul ng-repeat="card in cards | orderByValue">
<li>{{card.name}} {{value(card)}}</li>
</ul>
Here is a working fidd...
drag drop files into standard html file input
...solution but figured out for myself. Pretty simple change, just fileInputs[index] = ... to pass the file data to a particular input and then call a function showNext to add a new input stackoverflow.com/a/43397640/6392779
– nick
Apr 13 '17 at 16:46
...
Node.js: How to send headers with form data using request module?
...d uri or options object. at request (C:\Users\pjt\node_modules\request\index.js:44:11) at Request._callback (C:\Users\pjt\routes\payment.js:170:11) at Request.self.callback (C:\Users\pjt\node_modules\request\request.js:186:22) at emitTwo (events.js:106:13) at Request.emit (events...
In Python, how does one catch warnings as if they were exceptions?
...y list (i.e. []), then running the code will give you the following error: IndexError: list index out of range. If you're just looking to format or check properties of the captured warnings, then it's better to use a for-loop: for x in w: print(f'{x.category.__name__}: {str(x.message)}')
...
Truncating floats in Python
...
try:
cut_point = token_string.index('.') + n + 1
except ValueError: # no decimal in string
return token_string + '.' + '0' * n
else:
if len(token_string) < cut_poin...
Can I set null as the default value for a @Value in Spring?
...lue default - use SPEL (spring expression language) as follows:
@Value("${index.suffix:#{''}}")
private String indexSuffix;
#{''} just gets you an empty string as injected @Value's default.
by yl
share
|
...
Get nodes where child node contains an attribute
... while((i=ap.evalXPath())!=-1){
System.out.println("index ==>"+i);
}
/*if (vn.endsWith(i, "< test")){
System.out.println(" good ");
}else
System.out.println(" bad ");*/
}
}
}
...
How to add to an existing hash in Ruby
...vert freely between Symbol and String methods of addressing.
You can also index on nearly anything, including classes, numbers, or other Hashes.
hash = { Object => true, Hash => false }
hash[Object]
# => true
hash[Hash]
# => false
hash[Array]
# => nil
Hashes can be converted to...