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What exactly does the enable-background attribute do?
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2 Answers
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Active
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Open an IO stream from a local file or url
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226
open-uri is part of the standard Ruby library, and it will redefine the behavior of open so th...
How do you use Mongoose without defining a schema?
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answered Sep 12 '12 at 13:21
Jonathan P. DiazJonathan P. Diaz
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How to create multiple levels of indentation in Javadoc?
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129
<ul>
<li>Element</li>
<ul>
<li>Subelement...</li>
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Show just the current branch in Git
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edited Sep 13 '09 at 23:48
answered Sep 13 '09 at 15:39
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Using IQueryable with Linq
...Products table, and you want to get all of the products whose cost is >$25.
If you do:
IEnumerable<Product> products = myORM.GetProducts();
var productsOver25 = products.Where(p => p.Cost >= 25.00);
What happens here, is the database loads all of the products, and passes them ac...
Getting a 'source: not found' error when using source in a bash script
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232
If you're writing a bash script, call it by name:
#!/bin/bash
/bin/sh is not guaranteed to ...
Logger slf4j advantages of formatting with {} instead of string concatenation
...meters are possible
Because the vast majority of logging statements have 2 or fewer parameters, so SLF4J API up to version 1.6 covers (only) the majority of use cases. The API designers have provided overloaded methods with varargs parameters since API version 1.7.
For those cases where you need...
Create unique constraint with null columns
..., menu_id, recipe_id)
WHERE menu_id IS NOT NULL;
CREATE UNIQUE INDEX favo_2col_uni_idx ON favorites (user_id, recipe_id)
WHERE menu_id IS NULL;
This way, there can only be one combination of (user_id, recipe_id) where menu_id IS NULL, effectively implementing the desired constraint.
Possible dra...
Does MySQL ignore null values on unique constraints?
... be unique. But I also want it to accept null values. Can my database have 2 null emails that way?
4 Answers
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