/
PostgresDialectTrait.php
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/
PostgresDialectTrait.php
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<?php
/**
* 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 3.0.0
* @license http://www.opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\Database\Dialect;
use Cake\Database\Expression\FunctionExpression;
use Cake\Database\Schema\PostgresSchema;
use Cake\Database\SqlDialectTrait;
/**
* Contains functions that encapsulates the SQL dialect used by Postgres,
* including query translators and schema introspection.
*
* @internal
*/
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 \Cake\Database\Query $query The query to be transformed
* @return \Cake\Database\Query
*/
protected function _transformDistinct($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 $query The query to translate.
* @return \Cake\Database\Query
*/
protected function _insertQueryTranslator($query)
{
if (!$query->clause('epilog')) {
$query->epilog('RETURNING *');
}
return $query;
}
/**
* Returns a 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 $expression The function expression to convert
* to postgres SQL.
* @return void
*/
protected function _transformFunctionExpression(FunctionExpression $expression)
{
switch ($expression->getName()) {
case 'CONCAT':
// CONCAT function is expressed as exp1 || exp2
$expression->setName('')->setConjunction(' ||');
break;
case 'DATEDIFF':
$expression
->setName('')
->setConjunction('-')
->iterateParts(function ($p) {
if (is_string($p)) {
$p = ['value' => [$p => 'literal'], 'type' => null];
} else {
$p['value'] = [$p['value']];
}
return new FunctionExpression('DATE', $p['value'], [$p['type']]);
});
break;
case 'CURRENT_DATE':
$time = new FunctionExpression('LOCALTIMESTAMP', [' 0 ' => 'literal']);
$expression->setName('CAST')->setConjunction(' AS ')->add([$time, 'date' => 'literal']);
break;
case 'CURRENT_TIME':
$time = new FunctionExpression('LOCALTIMESTAMP', [' 0 ' => 'literal']);
$expression->setName('CAST')->setConjunction(' AS ')->add([$time, 'time' => 'literal']);
break;
case 'NOW':
$expression->setName('LOCALTIMESTAMP')->add([' 0 ' => 'literal']);
break;
case 'DATE_ADD':
$expression
->setName('')
->setConjunction(' + INTERVAL')
->iterateParts(function ($p, $key) {
if ($key === 1) {
$p = sprintf("'%s'", $p);
}
return $p;
});
break;
case 'DAYOFWEEK':
$expression
->setName('EXTRACT')
->setConjunction(' ')
->add(['DOW FROM' => 'literal'], [], true)
->add([') + (1' => 'literal']); // Postgres starts on index 0 but Sunday should be 1
break;
}
}
/**
* Get the schema dialect.
*
* Used by Cake\Database\Schema package to reflect schema and
* generate schema.
*
* @return \Cake\Database\Schema\PostgresSchema
*/
public function schemaDialect()
{
if (!$this->_schemaDialect) {
$this->_schemaDialect = new PostgresSchema($this);
}
return $this->_schemaDialect;
}
/**
* {@inheritDoc}
*/
public function disableForeignKeySQL()
{
return 'SET CONSTRAINTS ALL DEFERRED';
}
/**
* {@inheritDoc}
*/
public function enableForeignKeySQL()
{
return 'SET CONSTRAINTS ALL IMMEDIATE';
}
}