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mysql create user if not exists
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I use
SELECT EXISTS (SELECT DISTINCT user FROM mysql.user WHERE user = "username") as is_user
should return 1 if exists or 0 if it does not
share
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How to delete multiple files at once in Bash on Linux?
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Just use multiline selection in sublime to combine all of the files into a single line and add a space between each file name and then add rm at the beginning of the list. This is mostly useful when there isn't a pattern in the filenames you wa...
Open Cygwin at a specific folder
...nload it again and start setup again to run an update), make sure that you select the chere package under the "Shells" category.
After Cygwin is launched, open up a Cygwin terminal (as an administrator) and type the command: chere -i -t mintty -s bash.
Now you should have "Bash Prompt Here" in the...
How to get the pure text without HTML element using JavaScript?
...n many ways. innerText tries to approximate what would happen if you would select what you see (rendered html) and copy it to the clipboard, while textContent sort of just strips the html tags and gives you what's left.
innerText also has compatability with old IE browsers (came from there).
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Is it possible to download an old APK for my app from Google Play?
... releases => Production (Manage Production) => Release history => Select the version that you want => Click on Download button.
Your account should be granted with full permissions, otherwise the download button will be hidden.
Original Answer
Go to
Developer Console => Ma...
How to execute a raw update sql with dynamic binding in rails
...ch less efficient, isn't it. Doesn't this trade one update statement for a select, bring the records into rails memory, update each record and send an update statement back for each record. 1 update vs 1 per record and much bandwidth, etc.? Does AR optimize this or not? I don't think it does.
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Using the last-child selector
...t can't be added dynamically through other code, but first-child is a CSS2 selector, whereas last-child was added in the CSS3 specification)
Note: This only works the way you intended if you only have 2 items in the list like your example. Any 3rd item and on will have borders applied to them.
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How to debug Angular JavaScript Code
...ference in console from a visual element
In many non-IE browsers, you can select an element by right clicking an element and clicking "Inspect Element". Alternatively you can also click on any element in Elements tab in Chrome, for example. The latest selected element will be stored in variable $0 ...
Query a parameter (postgresql.conf setting) like “max_connections”
... SHOW, such as minimum
and maximum values.
For your original request:
SELECT *
FROM pg_settings
WHERE name = 'max_connections';
Finally, there is current_setting(), which can be nested in DML statements:
SELECT current_setting('max_connections');
Related:
How to test my ad-hoc SQL wit...
Android emulator shows nothing except black screen and adb devices shows “device offline”
...Verify Configuration dialog. It forces turn off gpu mode whatever you have selected in the Emulated Performance. So change config.ini directly. hw.gpu.enabled=yes and hw.gpu.mode=on. The config files is normally in /user folder/.android/avd/emulator name.avd/.
– Sungsuh Park
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