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<?php |
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/** |
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* |
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* This file is part of Aura for PHP. |
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* |
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* @license http://opensource.org/licenses/bsd-license.php BSD |
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* |
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*/ |
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namespace Aura\SqlQuery; |
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/** |
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* |
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* Creates query statement objects. |
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* |
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* @package Aura.SqlQuery |
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* |
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*/ |
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class QueryFactory |
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{ |
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const COMMON = 'common'; |
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/** |
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* |
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* What database are we building for? |
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* |
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* @param string |
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* |
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*/ |
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protected $db; |
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/** |
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* |
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* Build "common" query objects regardless of database type? |
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* |
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* @param bool |
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* |
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*/ |
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protected $common = false; |
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/** |
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* |
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* A map of `table.col` names to last-insert-id names. |
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* |
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* @var array |
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* |
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*/ |
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protected $last_insert_id_names = array(); |
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/** |
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* |
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* A Quoter for identifiers. |
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* |
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* @param QuoterInterface |
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* |
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*/ |
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protected $quoter; |
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/** |
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* |
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* A count of Query instances, used for determining $seq_bind_prefix. |
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* |
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* @var int |
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* |
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*/ |
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protected $instance_count = 0; |
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/** |
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* |
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* Constructor. |
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* |
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* @param string $db The database type. |
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* |
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* @param string $common Pass the constant self::COMMON to force common |
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* query objects instead of db-specific ones. |
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* |
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*/ |
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public function __construct($db, $common = null) |
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{ |
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$this->db = ucfirst(strtolower($db)); |
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$this->common = ($common === self::COMMON); |
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} |
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/** |
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* |
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* Sets the last-insert-id names to be used for Insert queries.. |
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* |
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* @param array $last_insert_id_names A map of `table.col` names to |
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* last-insert-id names. |
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* |
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* @return null |
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* |
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*/ |
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public function setLastInsertIdNames(array $last_insert_id_names) |
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{ |
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$this->last_insert_id_names = $last_insert_id_names; |
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} |
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/** |
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* |
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* Returns a new SELECT object. |
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* |
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* @return Common\SelectInterface |
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* |
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*/ |
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public function newSelect() |
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{ |
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return $this->newInstance('Select'); |
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} |
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/** |
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* |
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* Returns a new INSERT object. |
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* @return Common\InsertInterface |
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* |
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*/ |
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public function newInsert() |
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{ |
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$insert = $this->newInstance('Insert'); |
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$insert->setLastInsertIdNames($this->last_insert_id_names); |
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return $insert; |
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} |
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/** |
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* |
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* Returns a new UPDATE object. |
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* |
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* @return Common\UpdateInterface |
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* |
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*/ |
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public function newUpdate() |
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{ |
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return $this->newInstance('Update'); |
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} |
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/** |
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* |
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* Returns a new DELETE object. |
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* |
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* @return Common\DeleteInterface |
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* |
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*/ |
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public function newDelete() |
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{ |
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return $this->newInstance('Delete'); |
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} |
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/** |
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* |
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* Returns a new query object. |
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* |
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* @param string $query The query object type. |
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* |
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* @return AbstractQuery |
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* |
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*/ |
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protected function newInstance($query) |
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{ |
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$queryClass = "Aura\SqlQuery\\{$this->db}\\{$query}"; |
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if ($this->common) { |
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$queryClass = "Aura\SqlQuery\Common\\{$query}"; |
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} |
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$builderClass = "Aura\SqlQuery\\{$this->db}\\{$query}Builder"; |
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if ($this->common || ! class_exists($builderClass)) { |
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$builderClass = "Aura\SqlQuery\Common\\{$query}Builder"; |
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} |
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return new $queryClass( |
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$this->getQuoter(), |
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$this->newBuilder($query), |
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$this->newSeqBindPrefix() |
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); |
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} |
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protected function newBuilder($query) |
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{ |
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$builderClass = "Aura\SqlQuery\\{$this->db}\\{$query}Builder"; |
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if ($this->common || ! class_exists($builderClass)) { |
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$builderClass = "Aura\SqlQuery\Common\\{$query}Builder"; |
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} |
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return new $builderClass(); |
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} |
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/** |
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* |
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* Returns the Quoter object for queries; creates one if needed. |
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* |
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* @return Quoter |
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* |
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*/ |
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protected function getQuoter() |
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{ |
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if (! $this->quoter) { |
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$this->quoter = $this->newQuoter(); |
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} |
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return $this->quoter; |
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} |
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protected function newQuoter() |
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{ |
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$quoterClass = "Aura\SqlQuery\\{$this->db}\Quoter"; |
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if ($this->common || ! class_exists($quoterClass)) { |
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$quoterClass = "Aura\SqlQuery\Common\Quoter"; |
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} |
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return new $quoterClass(); |
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} |
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/** |
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* |
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* Returns a new sequential-placeholder prefix for a query object. |
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* |
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* We need these to deconflict between bound values in subselect queries. |
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* |
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* @return string |
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* |
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*/ |
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protected function newSeqBindPrefix() |
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{ |
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$seq_bind_prefix = ''; |
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if ($this->instance_count) { |
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$seq_bind_prefix = '_' . $this->instance_count; |
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} |
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$this->instance_count ++; |
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return $seq_bind_prefix; |
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} |
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} |
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This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVar
assignment in line 1 and the$higher
assignment in line 2 are dead. The first because$myVar
is never used and the second because$higher
is always overwritten for every possible time line.