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Change One Cell's Data in mysql
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My answer is repeating what others have said before, but I thought I'd add an example, using MySQL, only because the previous answers were a little bit cryptic to me.
The general form of the command you need to use to update a single row's column:
UPDATE my_table S...
Storing a Map using JPA
...ns.
Something like this should work:
@Entity
public class Example {
@Id long id;
// ....
@ElementCollection
@MapKeyColumn(name="name")
@Column(name="value")
@CollectionTable(name="example_attributes", joinColumns=@JoinColumn(name="example_id"))
Map<String, String>...
How to force use of overflow menu on devices with menu button
...y prevented by design. According to the Compatibility Section of the Android Design Guide,
"...the action overflow is available from the menu hardware key. The resulting actions popup... is displayed at the bottom of the screen."
You'll note in the screenshots, phones with a physical menu button...
Problems with contenttypes when loading a fixture in Django
... keys". For example:
Permission.codename is used in favour of Permission.id
User.username is used in favour of User.id
Read more: natural keys section in "serializing django objects"
Some other useful arguments for dumpdata:
--indent=4 make it human readable.
-e sessions exclude session data
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How can I return an empty IEnumerable?
...n the following code and the suggestions given in this question , I've decided to modify this original method and ask if there are any values in the IEnumarable return it, if not return an IEnumerable with no values.
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Programmatically change the src of an img tag
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Give your img tag an id, then you can
document.getElementById("imageid").src="../template/save.png";
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Nesting await in Parallel.ForEach
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The whole idea behind Parallel.ForEach() is that you have a set of threads and each thread processes part of the collection. As you noticed, this doesn't work with async-await, where you want to release the thread for the duration of t...
How can I stop a running MySQL query?
...but mysql is printing... I can't see the prompt
– David B
Sep 24 '10 at 13:42
37
I agree with thi...
Data Modeling with Kafka? Topics and Partitions
...o in the example above, I would just have a single topic and if you´ll decide to push some other kind of data through Kafka, you can add a new topic for that later.
Topics are registered in ZooKeeper which means that you might run into issues if trying to add too many of them, e.g. the case where ...
Using the HTML5 “required” attribute for a group of checkboxes?
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Unfortunately HTML5 does not provide an out-of-the-box way to do that.
However, using jQuery, you can easily control if a checkbox group has at least one checked element.
Consider the following DOM snippet:
<div class="checkbox-group required">
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