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MySQL SELECT only not null values
...SELECT DISTINCT (
SELECT title
FROM test
WHERE title IS NOT NULL
ORDER BY id DESC
LIMIT 1
) title, (
SELECT body
FROM test
WHERE body IS NOT NULL
ORDER BY id DESC
LIMIT 1
) body
FROM test
I hope help you.
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Java Timer vs ExecutorService?
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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What is the difference between ApplicationContext and WebApplicationContext in Spring MVC?
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Why is Everyone Choosing JSON Over XML for jQuery? [closed]
...cord, struct, dictionary, hash table, keyed list, or associative array.
An ordered list of values. In most languages, this is realized as an array, vector, list, or sequence.
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Styling twitter bootstrap buttons
...@include button-variant($btn-primary-color, $btn-primary-bg, $btn-primary-border);
@include button-variant(red, white, blue);
}
Bootstrap 4 Alpha SASS Example
Bootstrap 3 LESS
.my-btn {
//.button-variant(@btn-primary-color; @btn-primary-bg; @btn-primary-border);
.button-variant(red; white;...
How to model type-safe enum types?
...s of limited utility in practice (you might as well use case objects).
In order to get something most closely resembling a Java Enum (i.e. with sensible toString and valueOf methods -- perhaps you are persisting the enum values to a database) you need to modify it a bit. If you had used skaffman's...
Check if a string has white space
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passport.js passport.initialize() middleware not in use
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Follow the example to avoid the out-of-order middleware hell that express makes it so easy to enter. Straight from the docs. Note how yours does not match this exactly.
var app = express();
app.use(require('serve-static')(__dirname + '/../../public'));
app.use(re...
What are the security risks of setting Access-Control-Allow-Origin?
I recently had to set Access-Control-Allow-Origin to * in order to be able to make cross-subdomain ajax calls.
Now I can't help but feel that I'm putting my environment to security risks.
Please help me if I'm doing it wrong.
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What are OLTP and OLAP. What is the difference between them?
...storical data) use OLAP
if you are doing transactions (ex. adding/removing orders on an e-commerce cart) use OLTP
Short answer:
Let's consider two example scenarios:
Scenario 1:
You are building an online store/website, and you want to be able to:
store user data, passwords, previous transact...