大约有 15,000 项符合查询结果（耗时：0.0260秒） [XML]
SQL NVARCHAR and VARCHAR Limits
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Newer syntax elements.
1. The CONCAT function doesn't help here
DECLARE @A5000 VARCHAR(5000) = REPLICATE('A',5000);
SELECT DATALENGTH(@A5000 + @A5000),
DATALENGTH(CONCAT(@A5000,@A5000));
The above returns 8000 for both methods of concatenation.
2. Be careful with +=
DECLARE @A VARCHAR(MAX...
Build Eclipse Java Project from Command Line
...se
BUT all that involves ant, which is not what Keith is after.
For a batch compilation, please refer to Compiling Java code, especially the section "Using the batch compiler"
The batch compiler class is located in the JDT Core plug-in. The name of the class is org.eclipse.jdt.compiler.batc...
Implement Stack using Two Queues
...ked earlier there , but the question here is the reverse of it, using two queues as a stack. The question...
23 Answers
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Alternatives to dispatch_get_current_queue() for completion blocks in iOS 6?
...d run in the background, while the completion block should run in whatever queue the method was called.
7 Answers
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presentViewController:animated:YES view will not appear until user taps again
...ES completion:nil];
CFRunLoopWakeUp(CFRunLoopGetCurrent());
Or you can enqueue an empty block to the main queue:
[self presentViewController:vc animated:YES completion:nil];
dispatch_async(dispatch_get_main_queue(), ^{});
It's funny, but if you shake the device, it'll also trigger the main loop...
Delete all the queues from RabbitMQ?
I installed rabbitmqadmin and was able to list all the exchanges and queues. How can I use rabbitmqadmin or rabbitmqctl to delete all the queues.
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ios Upload Image and Text using HTTP POST
...t will be something like: [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {}];
– eric
Aug 6 '15 at 22:32
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Get the data received in a Flask request
...son" -X POST -d '{"userId":"1", "username": "fizz bizz"}' http://localhost:5000/foo
Or to use Postman:
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How to set limits for axes in ggplot2 R plots?
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Basically you have two options
scale_x_continuous(limits = c(-5000, 5000))
or
coord_cartesian(xlim = c(-5000, 5000))
Where the first removes all data points outside the given range and the second only adjusts the visible area. In most cases you would not see the difference, but if...
javac is not recognized as an internal or external command, operable program or batch file [closed]
... is not recognized as an internal or external command, operable program or batch file.
You must add the Java executables directory to PATH.
JDK vs. JRE
(If you already understand this, feel free to skip this section.)
When downloading Java, you are offered a choice between:
The Java Runtime En...