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Can table columns with a Foreign Key be NULL?
... INTO child (id, parent_id) VALUES (1, NULL);
-- Query OK, 1 row affected (0.01 sec)
INSERT INTO child (id, parent_id) VALUES (2, 1);
-- ERROR 1452 (23000): Cannot add or update a child row: a foreign key
-- constraint fails (`t/child`, CONSTRAINT `child_ibfk_1` FOREIGN KEY
-- (`parent_id`) REFE...
invalid context 0x0 under iOS 7.0 and system degradation
...core graphics context, but I doubt that's the issue. These invalid context 0x0 error messages are common and easy to reproduce in iOS 7. In fact, I can reproduce the error using storyboard with zero code. I drag a UITextField onto the canvas in IB, run the app, and double tap inside the text field. ...
Find text string using jQuery?
... edited Oct 17 '19 at 4:38
user202729
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answered May 29 '09 at 15:34
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How do I center align horizontal menu?
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130
From http://pmob.co.uk/pob/centred-float.htm:
The premise is simple and basically just involves...
When should we use mutex and when should we use semaphore
... edited Aug 22 '12 at 7:29
j0k
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answered Aug 22 '12 at 3:12
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How do I do a bulk insert in mySQL using node.js
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edited Apr 27 at 19:04
Agnel Vishal
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answered Jan 10 '13 at 1...
Is it possible to view RabbitMQ message contents directly from the command line?
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107
You should enable the management plugin.
rabbitmq-plugins enable rabbitmq_management
See her...
Create a string of variable length, filled with a repeated character
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10 Answers
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Find if variable is divisible by 2
.../ Will evaluate to true if the variable is divisible by 2
variable % 2 === 0
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Working with Enums in android
...u can add values to them like this.
public enum Gender {
MALE("Male", 0),
FEMALE("Female", 1);
private String stringValue;
private int intValue;
private Gender(String toString, int value) {
stringValue = toString;
intValue = value;
}
@Override
publi...