/
PostgresDialectTrait.php
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/
PostgresDialectTrait.php
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<?php
/**
* PHP Version 5.4
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* For full copyright and license information, please see the LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @since CakePHP(tm) v 3.0.0
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/
namespace Cake\Database\Dialect;
use Cake\Database\Expression\FunctionExpression;
use Cake\Database\Expression\UnaryExpression;
use Cake\Database\Query;
use Cake\Database\SqlDialectTrait;
/**
* Contains functions that encapsulates the SQL dialect used by Postgres,
* including query translators and schema introspection.
*/
trait PostgresDialectTrait {
use SqlDialectTrait;
/**
* String used to start a database identifier quoting to make it safe
*
* @var string
*/
protected $_startQuote = '"';
/**
* String used to end a database identifier quoting to make it safe
*
* @var string
*/
protected $_endQuote = '"';
/**
* The schema dialect class for this driver
*
* @var \Cake\Database\Schema\PostgresSchema
*/
protected $_schemaDialect;
/**
* Distinct clause needs no transformation
*
* @param Query $query The query to be transformed
* @return Query
*/
protected function _transformDistinct($query) {
return $query;
}
/**
* Modifies the original insert query to append a "RETURNING *" epilogue
* so that the latest insert id can be retrieved
*
* @param Cake\Database\Query $query
* @return Cake\Database\Query
*/
protected function _insertQueryTranslator($query) {
if (!$query->clause('epilog')) {
$query->epilog('RETURNING *');
}
return $query;
}
/**
* Returns an dictionary of expressions to be transformed when compiling a Query
* to SQL. Array keys are method names to be called in this class
*
* @return array
*/
protected function _expressionTranslators() {
$namespace = 'Cake\Database\Expression';
return [
$namespace . '\FunctionExpression' => '_transformFunctionExpression'
];
}
/**
* Receives a FunctionExpression and changes it so that it conforms to this
* SQL dialect.
*
* @param Cake\Database\Expression\FunctionExpression
* @return void
*/
protected function _transformFunctionExpression(FunctionExpression $expression) {
switch ($expression->name()) {
case 'CONCAT':
// CONCAT function is expressed as exp1 || exp2
$expression->name('')->type(' ||');
break;
case 'DATEDIFF':
$expression
->name('')
->type('-')
->iterateParts(function($p) {
return new FunctionExpression('DATE', [$p['value']], [$p['type']]);
});
break;
case 'CURRENT_DATE':
$time = new FunctionExpression('LOCALTIMESTAMP', [' 0 ' => 'literal']);
$expression->name('CAST')->type(' AS ')->add([$time, 'date' => 'literal']);
break;
case 'CURRENT_TIME':
$time = new FunctionExpression('LOCALTIMESTAMP', [' 0 ' => 'literal']);
$expression->name('CAST')->type(' AS ')->add([$time, 'time' => 'literal']);
break;
case 'NOW':
$expression->name('LOCALTIMESTAMP')->add([' 0 ' => 'literal']);
break;
}
}
/**
* Get the schema dialect.
*
* Used by Cake\Database\Schema package to reflect schema and
* generate schema.
*
* @return Cake\Database\Schema\PostgresSchema
*/
public function schemaDialect() {
if (!$this->_schemaDialect) {
$this->_schemaDialect = new \Cake\Database\Schema\PostgresSchema($this);
}
return $this->_schemaDialect;
}
}