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279 lines (242 loc) · 7.81 KB
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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4 enc=utf8: */
/**
* @author Alexey Zakhlestin
* @package mysql-query-builder
**/
/*
MySQL Query Builder
Copyright © 2005-2007 Alexey Zakhlestin <indeyets@gmail.com>
Copyright © 2005-2006 Konstantin Sedov <kostya.online@gmail.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* This class contains all the common logic shared by other query-classes
*
* @package mysql-query-builder
* @author Alexey Zakhlestin
*/
abstract class BasicQuery
{
private $conditions = null;
private $parameters;
private $sql = null;
private $orderby;
private $orderdirection;
/**
* contains QBTable objects related to current query
*
* @var array
*/
protected $from = array();
/**
* Constructor provides common logic (all queries are done on tables), but does not direct instantiation of BasicQuery
*
* @param mixed $tables
*/
protected function __construct($tables)
{
$this->setTables($tables);
}
/**
* Sets which table(s) the query will be applied to
*
* @param mixed $tables Can be either string, QBTable instance or array of strings/QBTables
* @return void
* @throws InvalidArgumentException, LogicException
*/
public function setTables($tables)
{
if (is_string($tables) or $tables instanceof QBTable)
$tables = array($tables);
if (!is_array($tables))
throw new InvalidArgumentException('table(s) should be specified as a string, or array of strings');
if (count($tables) == 0)
throw new InvalidArgumentException('there were no tables, specified');
$this->from = array();
foreach ($tables as $table) {
if (is_string($table)) {
$this->from[] = new QBTable($table);
} elseif ($table instanceof QBTable) {
$this->from[] = $table;
} else {
throw new LogicException("Invalid object is provided as a table");
}
}
$this->reset();
}
/**
* Sets where-condition, which will be applied to query
* The most typical objects to use as parameters are Condition and AndOp
*
* @param MQB_Condition $conditions
* @return void
* @author Jimi Dini
*/
public function setWhere(MQB_Condition $conditions = null)
{
if (null === $conditions) {
$this->conditions = null;
} elseif ($conditions instanceof MQB_Condition) {
$this->conditions = clone $conditions;
}
$this->reset();
}
/**
* setup "ORDER BY" clause of Query.
* $orderlist is supposed to be array of objects implementing MQB_Field (most-probably, Field objects).
* $orderdirectionlist is supposed to be array of booleans, where TRUE means DESC and FALSE means ASC.
* if number of elements of $orderdirectionlist is smaller that number of elements of $orderlist array, then ASC is applied to the tail-objects
*
* @param array $orderlist
* @param array $orderdirectionlist
* @return void
* @throws InvalidArgumentException
*/
public function setOrderby(array $orderlist, array $orderdirectionlist = array())
{
foreach ($orderlist as $field)
if (!($field instanceof MQB_Field))
throw new InvalidArgumentException('Only object implementing MQB_Field can be used in setOrderBy');
$this->orderby = $orderlist;
$this->orderdirection = $orderdirectionlist;
$this->reset();
}
/**
* accessor, which returns array of table-names used in Query.
*
* @return array
*/
public function showTables()
{
$res = array();
foreach ($this->from as $table) {
$res[] = $table->getTable();
}
return $res;
}
/**
* accessor, which returns current-querys condition
*
* @return MQB_Condition
*/
public function showConditions()
{
return $this->conditions;
}
// internal stuff
/**
* This method should be overridden by descendents
*
* @param array $parameters
* @return void
* @throws LogicException
*/
protected function getSql(array &$parameters)
{
throw new LogicException();
}
/**
* Returns "FROM" clause which can be used in various queries
*
* @param array $parameters
* @return void
*/
protected function getFrom(array &$parameters)
{
$froms = array();
for ($i = 0; $i < count($this->from); $i++) {
$froms[] = $this->from[$i]->__toString().' AS `t'.$i.'`';
}
$sql = ' FROM '.implode(", ", $froms);
return $sql;
}
/**
* Returns "WHERE" clause which can be used in various queries
*
* @param array $parameters
* @return void
*/
protected function getWhere(array &$parameters)
{
if (null === $this->conditions)
return "";
$sql = $this->conditions->getSql($parameters);
if (empty($sql))
return "";
return " WHERE ".$sql;
}
/**
* Returns "ORDER BY" clause which can be used in various queries
*
* @param array $parameters
* @return void
*/
protected function getOrderby(array &$parameters)
{
if (!$this->orderby || !is_array($this->orderby))
return "";
foreach ($this->orderby as $i => $field) {
if (array_key_exists($i, $this->orderdirection) && $this->orderdirection[$i])
$direction = ' DESC';
else
$direction = ' ASC';
if (null !== $alias = $field->getAlias())
$sqls[] = $alias.$direction;
else
$sqls[] = $field->getSql($parameters).$direction;
}
return " ORDER BY ".implode(", ", $sqls);
}
/**
* resets internal cache-structures, which are used for generation of sql-string and parameters-array
*
* @return void
*/
protected function reset()
{
$this->parameters = array();
$this->sql = null;
}
/**
* rebuilds (if needed) and returns SQL-string, which can be used for "prepared" query
*
* @return string
*/
public function sql(array &$parameters = null)
{
if (null === $this->sql) {
if (is_array($parameters)) {
$this->parameters = &$parameters;
} else {
$this->parameters = array();
}
$this->sql = $this->getSql($this->parameters);
}
return $this->sql;
}
/**
* returns array of parameters, which can be used with SQL-string from ->sql() method.
* WARNING: this method does not rebuild SQL-Query. Be sure to call ->sql() before using it.
*
* @return array
* @author Jimi Dini
*/
public function parameters()
{
if (null === $this->sql) {
throw new LogicException('->sql() method should be called, before calling ->parameters() method');
}
return $this->parameters;
}
}
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