大约有 45,000 项符合查询结果（耗时：0.0789秒） [XML]
Check if null Boolean is true results in exception
...s any other object.
In your particular case, your Boolean is null and the if statement triggers an implicit conversion to boolean that produces the NullPointerException. You may need instead:
if(bool != null && bool) { ... }
...
How to quickly and conveniently disable all console.log statements in my code?
...tion enableLogger()
{
if(oldConsoleLog == null)
return;
window['console']['log'] = oldConsoleLog;
};
pub.disableLogger = function disableLogger()
...
Cleaning `Inf` values from an R dataframe
...ame]])), j = .name,value =NA)))
Or using column numbers (possibly faster if there are a lot of columns):
for (j in 1:ncol(DT)) set(DT, which(is.infinite(DT[[j]])), j, NA)
Timings
# some `big(ish)` data
dat <- data.frame(a = rep(c(1,Inf), 1e6), b = rep(c(Inf,2), 1e6),
c = ...
How to dismiss a Twitter Bootstrap popover by clicking outside?
...click', function (e) {
//did not click a popover toggle or popover
if ($(e.target).data('toggle') !== 'popover'
&& $(e.target).parents('.popover.in').length === 0) {
$('[data-toggle="popover"]').popover('hide');
}
});
For buttons containing icons use (this code...
The necessity of hiding the salt for a hash
...ser name or phone number to salt the hash. Essentially something that is different for each user but is readily available to us. The other product randomly generates a salt for each user and changes each time the user changes the password. The salt is then encrypted in the database.
...
Java, Simplified check if int array contains int
...ally my mate has been saying that I could make my code shorter by using a different way of checking if an int array contains an int, although he won't tell me what it is :P.
...
How to check if a float value is a whole number
...
To check if a float value is a whole number, use the float.is_integer() method:
>>> (1.0).is_integer()
True
>>> (1.555).is_integer()
False
The method was added to the float type in Python 2.6.
Take into account t...
How to check if variable's type matches Type stored in a variable
How do I test if some variable is of some type in this way?
4 Answers
4
...
JPA getSingleResult() or null
...pdate method which inserts an Entity when it doesn't exist or update it if it does. To enable this, I have to findByIdAndForeignKey , if it returned null insert if not then update. The problem is how do I check if it exists? So I tried getSingleResult . But it throws an exception if the
...
Javascript: How to detect if browser window is scrolled to bottom?
I need to detect if a user is scrolled to the bottom of a page. If they are at the bottom of the page, when I add new content to the bottom, I will automatically scroll them to the new bottom. If they are not at the bottom, they are reading previous content higher on the page, so I don't want to aut...