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Provide an image for WhatsApp link sharing
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2020 standards
It takes a few steps to get the perfect preview for WhatsApp, Twitter, Facebook and bookmark icons for pc's and mobile devices. If you like reading go to ogp.me - but make sure to read steps 1 - 6 in this answer to get the best WhatsApp preview.
Please note: some apps or w...
Django - How to rename a model field using South?
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You can use the db.rename_column function.
class Migration:
def forwards(self, orm):
# Rename 'name' field to 'full_name'
db.rename_column('app_foo', 'name', 'full_name')
def backwards(self, orm):
# Rename 'full_name' field to 'name'
db.rename_colum...
How to debug Lock wait timeout exceeded on MySQL?
...es.
Since you know the query, all the tables being accessed are candidates for being the culprit.
From there, you should be able to run SHOW ENGINE INNODB STATUS\G
You should be able to see the affected table(s)
You get all kinds of additional Locking and Mutex Information.
Here is a sample from one...
Change R default library path using .libPaths in Rprofile.site fails to work
...n split apart but .libPaths can either report or alter its target.
The information about the R startup process can be read at ?Startup help page and there is RStudio material at: https://support.rstudio.com/hc/en-us/articles/200549016-Customizing-RStudio
In your case it appears that RStudio is no...
Why does Python code run faster in a function?
...r assign to a variable inside a scope, the compiler will issue STORE_FASTs for its access unless you tell it not to.
By the way, global lookups are still pretty optimised. Attribute lookups foo.bar are the really slow ones!
Here is small illustration on local variable efficiency.
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How do I load an org.w3c.dom.Document from XML in a string?
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This works for me in Java 1.5 - I stripped out specific exceptions for readability.
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import java.io.ByteArrayInputSt...
What's invokedynamic and how do I use it?
...sible -- if you know what "duck typing" is, invokedynamic basically allows for duck typing. There's not too much you as a Java programmer can do with it; if you're a tool creator, though, you can use it to build more flexible, more efficient JVM-based languages. Here is a really sweet blog post that...
What is the difference between buffer and cache memory in Linux?
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quote from:
https://web.archive.org/web/20110207101856/http://www.linuxforums.org/articles/using-top-more-efficiently_89.html
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Cannot highlight all occurrences of a selected word in Eclipse
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This solution is used only to toggle Mark Occurrences. Before to this Mark Occurrences have to enabled.You can enable it by going to Preferences --> Java --> Editor --> Mark Occurrences
– Vins
Mar 13 '14 at 8:59
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How to get root access on Android emulator?
...have All Android SDK versions(from 1.5 to 2.3.3), and I tried many methods for getting root in Android emulator. I don't use any Android device and test everything on emulator(AVD).
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