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How to avoid mysql 'Deadlock found when trying to get lock; try restarting transaction'
I have a innoDB table which records online users. It gets updated on every page refresh by a user to keep track of which pages they are on and their last access date to the site. I then have a cron that runs every 15 minutes to DELETE old records.
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How do I keep two side-by-side divs the same height?
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Flexbox
With flexbox it's a single declaration:
.row {
display: flex; /* equal height of the children */
}
.col {
flex: 1; /* additionally, equal width */
padding: 1em;
border: solid;
}
<div class="row">
<d...
Using Phonegap for Native Application development [closed]
I recently came across Phonegap . Have anyone of you tried it. Its an incredible tool which claims that developers can use HTML 5 based framework like Sencha touch and Jquery at the same time
having access to native features on phone. Also the code is portable from Android to Iphone with some effo...
How do I add an existing directory tree to a project in Visual Studio?
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edited Apr 8 '16 at 17:04
Maria Ines Parnisari
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What is the basic difference between the Factory and Abstract Factory Design Patterns? [closed]
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With the Factory pattern, you produce instances of implementations (Apple, Banana, Cherry, etc.) of a particular interface -- say, IFruit.
With the Abstract Factory pattern, you provide a way for anyone to provide their own f...
How to design a database for User Defined Fields?
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If performance is the primary concern, I would go with #6... a table per UDF (really, this is a variant of #2). This answer is specifically tailored to this situation and the description of the data distribution and access patterns described.
Pros:
Because you indicate tha...
how to check if object already exists in a list
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It depends on the needs of the specific situation. For example, the dictionary approach would be quite good assuming:
The list is relatively stable (not a lot of inserts/deletions, which dictionaries are not optimized for)
T...
Why is 1/1/1970 the “epoch time”?
...ns of unix measured system time in 1/60 s intervals. This meant that a 32-bit unsigned integer could only represent a span of time less than 829 days. For this reason, the time represented by the number 0 (called the epoch) had to be set in the very recent past. As this was in the early 1970s, the e...
What is a Maven artifact?
What is an artifact and why does Maven need it?
9 Answers
9
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Is there an eval() function in Java? [duplicate]
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You can use the ScriptEngine class and evaluate it as a Javascript string.
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("js");
Object result = engine.eval("4*5");
There may be a better way, but this one works.
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