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<?php
/**
* Class which implement a simple Iterator over a PDO connexion
*
* PHP version 5
*
* Copyright © 2010 Remi Collet
*
* This file is part of rpmphp.
*
* rpmphp is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* rpmphp is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with rpmphp. If not, see <http://www.gnu.org/licenses/>.
*
* @category Main
* @package RPMPHP
*
* @author Remi Collet <unknown@unknwown.com>
* @author Johan Cwiklinski <johan@x-tnd.be>
* @copyright 2010 Remi Collet
* @license http://www.gnu.org/licenses/agpl-3.0-standalone.html AGPL License 3.0 or (at your option) any later version
* @link http://github.com/remicollet/rpmphp/
* @since The begining of times.
*/
/**
* Helper for simple query => use directly or through CommonTable::request()
*
* Freely inspired from DBmysqlIterator class from GLPI
* (already written by Remi, and ported to PDO)
* See http://www.glpi-project.org/
*/
class TableIterator implements Iterator
{
private $con;
private $sql;
private $res = false;
private $row;
private $pos;
/**
* Constructor
*
* @param CommonDBTM $dbconnexion Database Connnexion
* (must be a CommonDBTM object)
* @param string $table table name
* @param string|array $crit string or array of filed/values,
* ex array("id"=>1), if empty => all rows
*/
function __construct (PDO $dbconnexion, $table, $crit='')
{
$this->conn = $dbconnexion;
if (is_string($table) && strpos($table, " ")) {
$this->sql = $table;
} else {
// check field, orderby, limit, start in criterias
$field="";
$orderby="";
$limit=0;
$start=0;
if (is_array($crit) && count($crit)) {
foreach ($crit as $key => $val) {
if ($key==="FIELDS") {
$field = $val;
unset($crit[$key]);
} else if ($key==="ORDER") {
$orderby = $val;
unset($crit[$key]);
} else if ($key==="LIMIT") {
$limit = $val;
unset($crit[$key]);
} else if ($key==="START") {
$start = $val;
unset($crit[$key]);
}
}
}
// SELECT field list
if (is_array($field)) {
$this->sql = "";
foreach ($field as $t => $f) {
if (is_numeric($t)) {
$this->sql .= (empty($this->sql)
? "SELECT " : ",") . $f;
} else if (is_array($f)) {
$this->sql .= (empty($this->sql)
? "SELECT $t." : ",$t.") . implode(",$t.", $f);
} else {
$this->sql .= (empty($this->sql)
? "SELECT " : ",") . "$t.$f";
}
}
} else if (empty($field)) {
$this->sql = "SELECT *";
} else {
$this->sql = "SELECT `$field`";
}
// FROM table list
if (is_array($table)) {
$this->sql .= " FROM `".implode("`, `", $table)."`";
} else {
$this->sql .= " FROM `$table`";
}
// WHERE criteria list
if (!empty($crit)) {
print_r($crit);
$this->sql .= " WHERE ".$this->_analyseCrit($crit);
}
// ORDER BY
if (is_array($orderby)) {
$this->sql .= " ORDER BY `".implode("`, `", $orderby)."`";
} else if (!empty($orderby)) {
$this->sql .= " ORDER BY `$orderby`";
}
if (is_numeric($limit) && $limit>0) {
$this->sql .= " LIMIT $limit";
if (is_numeric($start) && $start>0) {
$this->sql .= " OFFSET $start";
}
}
}
//echo "SQL: ".$this->sql."\n";
$this->res = $this->conn->prepare($this->sql);
if ($this->res===false) {
$err = $this->db->errorInfo();
throw new Exception($err[2]);
}
$this->pos = -1;
}
/**
* Class destructor
*/
function __destruct ()
{
if ($this->res) {
$this->res->closeCursor();
}
}
/**
* Build WHERE clause
*
* @param TODO $crit To document
* @param TODO $bool To document
*
* @return To document
*/
private function _analyseCrit ($crit, $bool="AND")
{
if (!is_array($crit)) {
return $crit;
}
$ret = "";
foreach ($crit as $name => $value) {
if (!empty($ret)) {
$ret .= " $bool ";
}
if (is_numeric($name)) {
// No Key case => recurse.
$ret .= "(" . $this->_analyseCrit($value, $bool) . ")";
} else if ($name==="OR" || $name==="AND") {
// Binary logical operator
$ret .= "(" . $this->_analyseCrit($value, $name) . ")";
} else if ($name==="NOT") {
// Uninary logicial operator
$ret .= " NOT (" . $this->_analyseCrit($value, "AND") . ")";
} else if ($name==="FKEY") {
// Foreign Key condition
if (is_array($value) && count($value)==2) {
reset($value);
list($t1,$f1)=each($value);
list($t2,$f2)=each($value);
$ret .= (is_numeric($t1) ? "$f1" : "$t1.$f1") . "=" .
(is_numeric($t2) ? "$f2" : "$t2.$f2");
} else {
trigger_error("BAD FOREIGN KEY", E_USER_ERROR);
}
} else if (is_array($value)) {
// Array of Value
$ret .= "$name IN ('". implode("','", $value)."')";
} else if (is_null($value)) {
// NULL condition
$ret .= "$name IS NULL";
} else if (is_numeric($value)) {
// Integer
$ret .= "$name=$value";
} else {
// String
$ret .= "$name='$value'";
}
}
return $ret;
}
/**
* To document
*
* @return To document
*/
public function rewind ()
{
if ($this->res && $this->pos>=0) {
$this->res->closeCursor();
$this->pos = -1;
}
if ($this->res && $this->pos<0) {
if (!$this->res->execute()) {
$err = $this->res->errorInfo();
throw new Exception($err[2]);
}
}
return $this->next();
}
/**
* To document
*
* @return To document
*/
public function current()
{
return $this->row;
}
/**
* To document
*
* @return To document
*/
public function key()
{
return (isset($this->row["id"]) ? $this->row["id"] : $this->pos);
}
/**
* To document
*
* @return To document
*/
public function next()
{
if (!$this->res) {
return false;
}
$this->row = $this->res->fetch(PDO::FETCH_ASSOC);
$this->pos++;
return $this->row;
}
/**
* To document
*
* @return To document
*/
public function valid()
{
return $this->res && $this->row;
}
/**
* To document
*
* @return To document
*/
public function numrows()
{
return ($this->res ? $this->res->rowCount() : 0);
}
}
?>
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