Best match query Post: 302981364

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Top Forums Programming Best match query Post 302981364 by stomp on Sunday 11th of September 2016 11:11:45 AM

09-11-2016

Registered User

Some comments:

If you try to write MySQL-Functions, I suggest starting from a very minimal function and extend bit by bit and checking if the results are as expected at every step. So you can catch up for single syntax/programming errors which is easier than to be faced with all of them at once
The mysql function syntax seems to me a bit limited in comparison with every real programming language, so I myself would never write anything but really needed snippets(if at all) as mysql functions.
In did not review your code in whole. But as you saw from my small 20 Line MySQL-Function: It already used 6 Seconds to complete, saying which huge amount of computing resources it needed. E. g. it was a very inefficient way to get it done. When I look at your code, you perform a lot of queries which should be all be very fast though. But I just wanted to note that some queries with big data sets can very quickly create huge loads of computing resources needed to get it done.
In Backup MySQL-Functions are not saved by default with the mysqldump command. You need to keep that in mind and
1. change your backup procedure, to have them included -or-
2. tell your system administrator to have that done in case you are not responsible for backup -or-
3. save your functions as textfiles outside the mysql database to be sure to have them backupped up

...and since my previous snippets where a whole lot more than you wanted, this search can be done very quick here.

UPDATE

Mmh. I detected that my solutions were not exactly what you wanted. But it should help nevertheless.

Last edited by stomp; 09-11-2016 at 12:54 PM..

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mysql_tzinfo_to_sql

MYSQL_TZINFO_TO_S(1)					       MySQL Database System					      MYSQL_TZINFO_TO_S(1)

NAME

       mysql_tzinfo_to_sql - load the time zone tables

SYNOPSIS

       mysql_tzinfo_to_sql arguments

DESCRIPTION

       The mysql_tzinfo_to_sql program loads the time zone tables in the mysql database. It is used on systems that have a zoneinfo database (the
       set of files describing time zones). Examples of such systems are Linux, FreeBSD, Solaris, and Mac OS X. One likely location for these
       files is the /usr/share/zoneinfo directory (/usr/share/lib/zoneinfo on Solaris). If your system does not have a zoneinfo database, you can
       use the downloadable package described in Section 10.6, "MySQL Server Time Zone Support".

       mysql_tzinfo_to_sql can be invoked several ways:

	   shell> mysql_tzinfo_to_sql tz_dir
	   shell> mysql_tzinfo_to_sql tz_file tz_name
	   shell> mysql_tzinfo_to_sql --leap tz_file

       For the first invocation syntax, pass the zoneinfo directory path name to mysql_tzinfo_to_sql and send the output into the mysql program.
       For example:

	   shell> mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root mysql

       mysql_tzinfo_to_sql reads your system's time zone files and generates SQL statements from them.	mysql processes those statements to load
       the time zone tables.

       The second syntax causes mysql_tzinfo_to_sql to load a single time zone file tz_file that corresponds to a time zone name tz_name:

	   shell> mysql_tzinfo_to_sql tz_file tz_name | mysql -u root mysql

       If your time zone needs to account for leap seconds, invoke mysql_tzinfo_to_sql using the third syntax, which initializes the leap second
       information.  tz_file is the name of your time zone file:

	   shell> mysql_tzinfo_to_sql --leap tz_file | mysql -u root mysql

       After running mysql_tzinfo_to_sql, it is best to restart the server so that it does not continue to use any previously cached time zone
       data.

COPYRIGHT

       Copyright (C) 1997, 2014, Oracle and/or its affiliates. All rights reserved.

       This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as
       published by the Free Software Foundation; version 2 of the License.

       This documentation is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation,
       Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.

SEE ALSO

       For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online
       at http://dev.mysql.com/doc/.

AUTHOR

       Oracle Corporation (http://dev.mysql.com/).

MySQL 5.5							    01/30/2014						      MYSQL_TZINFO_TO_S(1)