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Checking for an empty field with MySQL
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I have same comment as Quassnoi's. I issue "select orig_id,hotline from normal_1952 where !(hotline > '')" and there's one record with null hotline but it doesn't match.I'm using MySQL 5.6
– Scott Chu
Apr 15 '16 at 10:16
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Set the maximum character length of a UITextField
..., newValue, .OBJC_ASSOCIATION_RETAIN)
addTarget(self, action: #selector(checkMaxLength), for: .editingChanged)
}
}
@objc func checkMaxLength(textField: UITextField) {
guard let prospectiveText = self.text,
prospectiveText.count > maxLength
...
jQuery find events handlers registered with an object
...lem, "events" );
elem should be an HTML Element, not a jQuery object, or selector.
Please note, that this is an internal, 'private' structure, and shouldn't be modified. Use this for debugging purposes only.
In older versions of jQuery, you might have to use the old method which is:
jQuery( el...
Context switches much slower in new linux kernels
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One of the roles of BIOS feature selection is to enable/disable devices. In some cases these selections are forced on the OS (e.g., on-motherboard USB, eSATA and NICs). In others the OS is expected to respect your wishes (e.g., EIST, C states, Hyperthreading...
How to get the last character of a string in a shell?
I have written the following lines to get the last character of a string:
8 Answers
8
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Import PEM into Java Key Store
...s in the original example I found on internet:
ks.load( null, keypass.toCharArray());
ks.store( new FileOutputStream ( "mykeystore" ), keypass.toCharArray());
ks.load( new FileInputStream ( "mykeystore" ), keypass.toCharArray());
// end of section..
// read the key file from disk and create...
Redefine tab as 4 spaces
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It depends on what you mean. Do you want actual tab characters in your file to appear 4 spaces wide, or by "tab" do you actually mean an indent, generated by pressing the tab key, which would result in the file literally containing (up to) 4 space characters for each "tab" you...
How to convert QString to std::string?
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That's true - I was thinking about const char *x = qs.ToUtf8().constData(). Still, isn't it easier to just call qs.toStdString()?
– Vitali
Dec 6 '11 at 14:36
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Print current call stack from a method in Python code
... @RichieHindle's excellent answer which implements a decorator that can be selectively applied to functions as desired. Works with Python 2.7.14 and 3.6.4.
from __future__ import print_function
import functools
import traceback
import sys
INDENT = 4*' '
def stacktrace(func):
@functools.wraps(...
Changing the default header comment license in Xcode
...o change the organization name in Xcode click on the project file so it is selected (left sidebar of Xcode in the Project navigator) > In the File Inspector (right sidebar of Xcode) change the Organization text box.
sha...