You are looking at historical revision 26660 of this page. It may differ significantly from its current revision.
A small MySQL client library for chicken-scheme. This egg makes it possible to execute an SQL query on a MySQL database.
A. Carl Douglas
Requires MySQL database system development components, libmysqlclient and mysql_config.
The mysql_config program needs to be in the $PATH so the linker can find the native MySQL libraries.
On a Linux machine, consider trying:
apt-get install libmysqlclient-dev
The mysql-client egg also has a runtime dependency on the regex egg.
API[procedure] (make-mysql-connection hostname username password schema)
This procedure will return a procedure that contains a closed off MySQL connection and can execute a query when called.
Here is a trivial example:
(use mysql-client) (define mysql (make-mysql-connection "localhost" "root" #f "information_schema")) (define fetch (mysql "SELECT * FROM schemata")) (display (fetch)) (newline)
Here is an example that will use the mysql_real_escape_string MySQL function to safely escape parameters in the query string using a placeholder syntax. In this case, the first argument is a string containing an SQL query, and the second argument will be an association list where the key represents the placeholder symbol in the query.
(use mysql-client) (define mysql (make-mysql-connection "localhost" "username" "secret" "database")) (define fetch (mysql "SELECT * FROM t1 WHERE c1 = '$1' OR c2 = '$2'" '(($1 . "value 1';' ;")($2 . "value 2'; drop database; ")))) (display (fetch)) (newline)
For power users, to access directly the MySQL connection object pointer, pass a procedure to the MySQL client closure.
(use mysql-client) (define mysql (make-mysql-connection "localhost" "username" "secret" "database")) (define fetch (mysql (lambda(c)(printf "~S ~%" c)))) (display (fetch)) (newline)
Copyright (C) 2012, A. Carl Douglas All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither the name of the author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- 0.4 Initial publication