大约有 43,000 项符合查询结果（耗时：0.0479秒） [XML]
Java synchronized method lock on object, or method?
...s, you have synchronize on them separately in synchronized () blocks. If a and b were object references you would use:
public void addA() {
synchronized( a ) {
a++;
}
}
public void addB() {
synchronized( b ) {
b++;
}
}
But since they're primitives you can't do thi...
How do I include inline JavaScript in Haml?
.../tr>
{% } %}
</script>
At first I used the :cdata to convert (from html2haml), it doesn't work properly (Delete button can't remove relevant component in callback).
<script id='template-download' type='text/x-tmpl'>
<![CDATA[
{% for (var i=0, fil...
Why there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT clause?
... table could be
automatically initialized or updated to the current date and time.
This restriction has been lifted. Any TIMESTAMP column definition can
have any combination of DEFAULT CURRENT_TIMESTAMP and ON UPDATE
CURRENT_TIMESTAMP clauses. In addition, these clauses now can be used
wit...
How to call Stored Procedure in Entity Framework 6 (Code-First)?
I am very new to Entity Framework 6 and I want to implement stored procedures in my project. I have a stored procedure as follows:
...
Pass a data.frame column name to a function
...want to save the user from typing all those quotes, one option might be to convert bare, unquoted column names to strings using deparse(substitute()):
new_column2 <- function(df,col_name,col1,col2){
col_name <- deparse(substitute(col_name))
col1 <- deparse(substitute(col1))
col...
iPhone: Detecting user inactivity/idle time since last screen touch
...dleTimerExceeded {
NSLog(@"idle time exceeded");
}
where maxIdleTime and idleTimer are instance variables.
In order for this to work, you also need to modify your main.m to tell UIApplicationMain to use your delegate class (in this example, AppDelegate) as the principal class:
int retVal = U...
Is it possible to iterate through JSONArray? [duplicate]
... arr.length() on each iteration? So maybe better to put that into vairable and use that in the loop.
– husayt
Mar 7 '12 at 12:05
...
Declare a block method parameter without using a typedef
... (void)smartBlocks:(NSString *)yo youSmart:(void (^) (NSString *response))handler {
if ([yo compare:@"Pen"] == NSOrderedSame) {
handler(@"Ink");
}
if ([yo compare:@"Pencil"] == NSOrderedSame) {
handler(@"led");
}
}
...
MySQL和MongoDB设计实例进行对比 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...signed NOT NULL AUTO_INCREMENT,
`name` VARCHAR(100) NOT NULL,
`brand` VARCHAR(100) NOT NULL,
PRIMARY KEY (`id`)
);
CREATE TABLE IF NOT EXISTS `mobile_params` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`mobile_id` int(10) unsigned NOT NULL,
`name` varchar(100) ...
Clicking the back button twice to exit an activity
I've noticed this pattern in a lot of Android apps and games recently: when clicking the back button to "exit" the application, a Toast comes up with a message similar to "Please click BACK again to exit".
...