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Full Discussion: ? parameter in mysql query
Top Forums Shell Programming and Scripting ? parameter in mysql query Post 302309022 by cbkihong on Tuesday 21st of April 2009 02:13:47 AM
Old 04-21-2009
? is a parameter placeholder. That way you don't have to directly compose the SQL with parameters given (failure to escape the parameters properly is the major reason for SQL injection attacks).

Typically, the ? is not valid at the database layer. Normally the database library will dynamically replace them with the parameters (converting where necessary) in the SQL and pass the resulting the query to the database. In other cases, the database engine may accept placeholders itself, especially true if the db supports prepared statements so that an SQL can be prepared once, thus allowing it to be instantiated multiple times to perform the same query with different set of parameters.
 

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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)
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