09-10-2008
passing regular expressions to mysql via $1
hi, unix and mysql gurus.
i'm trying to create a simple ksh script that accesses the mysql system database table, user. the idea is that the user can call the script with a regular expression to see some users, or call it without any options to see all users. this is what i have so far:
*****************************************************
mysql -BCNnqs --disable-pager -u system -pmanager << EOJ
use mysql;
set @regex = '$1';
select user from user where user REGEXP @regex;
quit
EOJ
*****************************************************
the problem, of course, is that if $1 is null, i get this error:
==> ERROR 1139 (42000) at line 8: Got error 'empty (sub)expression' from regexp
i changed my set statement to this, but it didn't work:
*****************************************************
set @regex = if(@regex is null, '^[a-z]','$1');
*****************************************************
does anyone know what i'm doing wrong? i'd appreciate your input. thanks.
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LEARN ABOUT OPENSOLARIS
perror
perror(1) MySQL database perror(1)
NAME
perror - describes a system or MySQL error code.
SYNOPSIS
perror [OPTIONS] [ERRORCODE [ERRORCODE...]]
DESCRIPTION
Can be used to display a description for a system error code, or an MyISAM/ISAM table handler error code. The error messages are mostly
system dependent.
OPTIONS
-?|--help
Displays this help and exits.
-I|--info
Synonym for the above.
-s|--silent
Only print the error message
-v|--verbose
Print error code and message (default).
-V|--version
Displays version information and exits.
EXAMPLE
shell> perror 64 79 Error code 64: Machine is not on the network Error code 79: Can not access a needed shared library
SEE ALSO
isamchk(1), isamlog(1), mysql(1), mysqlaccess(1), mysqladmin(1), mysqld(1), mysqld_multi(1), mysqld_safe(1), mysqldump(1), mysql_fix_privi-
lege_tables(1), mysqlshow(1), mysql_zap(1), replace(1)
For more information please refer to the MySQL reference manual, which may already be installed locally and which is also available online
at http://www.mysql.com/doc/en/
BUGS
Please refer to http://bugs.mysql.com/ to report bugs.
AUTHOR
Ver 1.0, distribution 4.0.24 Michael (Monty) Widenius (monty@mysql.com), MySQL AB (http://www.mysql.com/). This software comes with no
warranty. Manual page by L. (Kill-9) Pedersen (kill-9@kill-9.dk), Mercurmedia Data Model Architect / system developer (http://www.mercur-
media.com)
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+--------------------+------------------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+------------------------------------+
|Availability | SUNWmysqlr, SUNWmysqlu, SUNWmysqlt |
+--------------------+------------------------------------+
|Interface Stability | External |
+--------------------+------------------------------------+
NOTES
Source for mysql is available on http://opensolaris.org.
MySQL 4.0 19 December 2000 perror(1)