<?php
# PHP dbx extensions -- a safer interface to dbx_query()
# http://www.dlitz.net/software/php-db-ext/
# Version 1.0
# ---------------------------------------- 
# Copyright (c) 2003 Dwayne C. Litzenberger <dlitz@dlitz.net>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
# 
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
# ---------------------------------------- 
#
# Usage:
#   object dbx_execute ( object link_identifier, string query, array args [, long flags])
#   string dbx_make_query ( object link_identifier, string query, array args)
#   string dbx_quote_arg ( object link_identifier, string arg)
#
# Examples:
#   $link = dbx_connect(...);
#   $results = dbx_execute($link,
#       "DELETE FROM foo WHERE a = ? AND b = ? AND c = ? AND d = ?",
#       array("foo", $b, 5, '5'));
#   $real_query = dbx_make_query($link,
#       "DELETE FROM foo WHERE a = ? AND b = ? AND c = ? AND d = ?",
#       array("foo", "foo\"'\\\x00bar", 5, '5'));

class _dbx_execute_wrapper {
    var $link;
    var $_args;
    var $_argnum;
    function _dbx_execute_wrapper($link) {
        $this->link = $link;
    }
    function execute($query, $args=null, $flags=null) {
        $q = $this->make_query($query, $args);
        if (is_null($flags)) {
            return dbx_query($this->link, $q);
        } else {
            return dbx_query($this->link, $q, $flags);
        }
    }
    function make_query($query, $args) {
        $this->_argnum = 0;
        $this->_args = $args;
        return preg_replace_callback("|(\\?)|", array($this, '_cb'), $query);
    }
    function quote_arg($arg) {
        if (is_int($arg)) {
            return strval(intval($arg));
        } else if (is_null($arg)) {
            return "NULL";
        }
        return "'" . dbx_escape_string($this->link, $arg) . "'";
    }
    function _cb($matches) {
        $arg = $this->_args[$this->_argnum];
        $this->_argnum++;
        return $this->quote_arg($arg);
    }
}

function dbx_execute($link, $query, $args=null, $flags=null) {
    $w = new _dbx_execute_wrapper($link);
    return $w->execute($query, $args, $flags);
}

function dbx_make_query($link, $query, $args=null) {
    $w = new _dbx_execute_wrapper($link);
    return $w->make_query($query, $args);
}

function dbx_quote_arg($link, $arg) {
    $w = new _dbx_execute_wrapper($link);
    return $w->quote_arg($arg);
}

# vim:set ts=4 sw=4 expandtab: