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<?php
/**
* Class which implement a simple Iterator over a PDO connexion
*
* PHP version 5
*
* Copyright © 2010-2014 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 2010-2014 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 https://git.remirepo.net/cgit/web/rpmphp.git/
* @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/
*
* @category Main
* @package RPMPHP
*
* @author Remi Collet <unknown@unknwown.com>
* @author Johan Cwiklinski <johan@x-tnd.be>
* @license http://www.gnu.org/licenses/agpl-3.0-standalone.html AGPL License 3.0 or (at your option) any later version
* @link https://git.remirepo.net/cgit/web/rpmphp.git/
*/
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 or complete SQL request
* @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;
$distinct = '';
if (is_array($crit) && count($crit)) {
foreach ($crit as $key => $val) {
if ($key==="FIELDS") {
$field = $val;
unset($crit[$key]);
} else if ($key==="DISTINCT") {
if ($val) {
$distinct = $key;
}
unset($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 $distinct " : ",") . $f;
} else if (is_array($f)) {
$this->_sql .= (empty($this->_sql)
? "SELECT $distinct $t." : ",$t.") . implode(",$t.", $f);
} else {
$this->_sql .= (empty($this->_sql)
? "SELECT $distinct " : ",") . "$t.$f";
}
}
} else if (empty($field)) {
$this->_sql = "SELECT *";
} else {
$this->_sql = "SELECT $distinct `$field`";
}
// FROM table list
if (is_array($table)) {
$this->_sql .= " FROM `".implode("`, `", $table)."`";
} else {
$this->_sql .= " FROM `$table`";
}
// WHERE criteria list
if (!empty($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 string|array $crit To document
* @param string $bool logical operator between criteria
*
* @return To document
*/
private function _analyseCrit ($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=$value";
} else if (($value[0]=='>' || $value[0]=='<')
&& is_numeric(substr($value,1))) {
// > integer
$ret .= "$name $value";
} else if (strpos($value,'%')===false){
// String
$ret .= "$name=" . $this->_conn->quote($value);
} else {
// String with pattern
$ret .= "$name LIKE " . $this->_conn->quote($value);
}
}
return $ret;
}
/**
* Go to the begin of the request (launch it)
*
* @return hastable|false : next row
*/
public function rewind ()
{
if ($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(
"\nSQL: " . $this->_sql .
"\nERROR: " . $err[2] .
"\nCODE:" . $err[0]
);
}
}
return $this->next();
}
/**
* Retrieve current row
*
* @return hastable|false
*/
public function current()
{
return $this->_row;
}
/**
* Retrieve key of current row
*
* @return mixed
*/
public function key()
{
return (isset($this->_row["id"]) ? $this->_row["id"] : $this->_pos);
}
/**
* Retrieve next row
*
* @return hastable|false
*/
public function next()
{
if (!$this->_res) {
return false;
}
$this->_row = $this->_res->fetch(PDO::FETCH_ASSOC);
$this->_pos++;
return $this->_row;
}
/**
* Is current row defined
*
* @return boolean
*/
public function valid()
{
return $this->_res && $this->_row;
}
/**
* Compute number of rows
*
* @return integer
*/
public function numrows()
{
return ($this->_res ? $this->_res->rowCount() : 0);
}
}
?>
|
