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MySql Table Insert if not exist otherwise update
... It might be needed to create UNIQUE constraint for Timestamp by using ALTER TABLE AggregatedData ADD UNIQUE (Timestamp)
– Avyakt
Jan 19 '15 at 19:13
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Unix shell script find out which directory the script file resides?
...e responses, they don't add anything useful). The interesting work is done by the mentioned unix command readlink with option -f. Works when the script is called by an absolute as well as by a relative path.
For bash, sh, ksh:
#!/bin/bash
# Absolute path to this script, e.g. /home/user/bin/foo.sh...
How to read values from properties file?
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Edited as suggested by @Ethan. Thanks for update, could not accept original edit, it was too late already.
– mrembisz
Mar 26 '13 at 16:15
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How to force a html5 form validation without submitting it via jQuery
...e browsers have (such as Chrome), unfortunately the only way to do that is by submitting the form, like this:
var $myForm = $('#myForm');
if(! $myForm[0].checkValidity()) {
// If the form is invalid, submit it. The form won't actually submit;
// this will just cause the browser to display the ...
Two-dimensional array in Swift
I get so confused about 2D arrays in Swift. Let me describe step by step. And would you please correct me if I am wrong.
8 ...
GraphViz - How to connect subgraphs?
...ge labels appear to be floating over a cluster instead of being positioned by the edge itself.
– Winston Smith
Jan 8 '10 at 11:12
62
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setting multiple column using one update
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Just add parameters, split by comma:
UPDATE tablename SET column1 = "value1", column2 = "value2" ....
See also: mySQL manual on UPDATE
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GROUP_CONCAT comma separator - MySQL
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SELECT id,GROUP_CONCAT(text SEPARATOR ' ') AS text FROM table_name group by id;
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Difference between await and ContinueWith
...slightly complex, await leads to much simpler code. Additionally, as noted by Servy in comments, awaiting a task will "unwrap" aggregate exceptions which usually leads to simpler error handling. Also using await will implicitly schedule the continuation in the calling context (unless you use Configu...
how to log in to mysql and query the database from linux terminal
...rd: prompt, well, enter root's password :)
You can find further reference by typing mysql --help or at the online manual.
2. How I stop the mysql server from linux terminal?
It depends. Red Hat based distros have the service command:
service mysqld stop
Other distros require to call the init s...