[BASH] Gawk + MYSQL script Post: 302837573

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Top Forums Shell Programming and Scripting [BASH] Gawk + MYSQL script Post 302837573 by Zimny on Friday 26th of July 2013 05:39:57 AM

07-26-2013

Registered User

[BASH] Gawk + MYSQL script

Hello!

I've got script to write. It should read databases (names, volumes) from table testdatabase and compares it to actually existing databases in /var/lib/mysql/. If there is no informations about database in table - we should see information "There is no declared informations about database in table testdatabase." And if volume of database is too big - we should see information "Database database has too big actual size volume, it exceeds declared size in table testdatabase."

My problem is that even if there is existing database in /var/lib/mysql/ and I put informations about it in table testdatabase - I see statement - "There is no declared...".

Do you have any idea what am I doing wrong?

Code:

cd /var/lib/mysql/ || exit 1

gawk '
BEGIN {
   cmd = "mysql -u root -ppassword knowdatabases \"SELECT name, volume, date, description FROM testdatabase\""
   while ( cmd | getline ) {
      DATABASE[$1,1] = $2;
      DATABASE[$1,2] = $1;
   }
   close(cmd)
   
   cmd = "find /var/lib/mysql/ -maxdepth 1 -mindepth 1 -type d | xargs du -sm"
   while ( cmd | getline ) {
      VOL = $1;
      NAM = $2;
      if ( ! DATABASE[NAM,1] ) {
         print "There is no declared informations about " NAM " in table testdatabase."
      continue
      }
      if ( VOL > DATABASE[NAM,1] ) {
         print "Database " NAM " has too big actual size (" VOL "), it exceeds declared size in table testdatabase."
      continue
      }
   }
   close(cmd)
}
' /dev/null

Zimny

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drop_database

DROP 
DATABASE(7)					  PostgreSQL 9.2.7 Documentation					  DROP DATABASE(7)

NAME

       DROP_DATABASE - remove a database

SYNOPSIS

       DROP DATABASE [ IF EXISTS ] name

DESCRIPTION

       DROP DATABASE drops a database. It removes the catalog entries for the database and deletes the directory containing the data. It can only
       be executed by the database owner. Also, it cannot be executed while you or anyone else are connected to the target database. (Connect to
       postgres or any other database to issue this command.)

       DROP DATABASE cannot be undone. Use it with care!

PARAMETERS

       IF EXISTS
	   Do not throw an error if the database does not exist. A notice is issued in this case.

       name
	   The name of the database to remove.

NOTES

       DROP DATABASE cannot be executed inside a transaction block.

       This command cannot be executed while connected to the target database. Thus, it might be more convenient to use the program dropdb(1)
       instead, which is a wrapper around this command.

COMPATIBILITY

       There is no DROP DATABASE statement in the SQL standard.

SEE ALSO

       CREATE DATABASE (CREATE_DATABASE(7))

PostgreSQL 9.2.7						    2014-02-17							  DROP DATABASE(7)