/
SqliteDialectTrait.php
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/
SqliteDialectTrait.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\ExpressionInterface;
use Cake\Database\Expression\FunctionExpression;
use Cake\Database\Query;
use Cake\Database\SqlDialectTrait;
trait SqliteDialectTrait {
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\SqliteSchema
*/
protected $_schemaDialect;
/**
* 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':
$expression
->name('ROUND')
->type('-')
->iterateParts(function($p) {
return new FunctionExpression('JULIANDAY', [$p['value']], [$p['type']]);
});
break;
case 'NOW':
$expression->name('DATETIME')->add(["'now'" => 'literal']);
break;
case 'CURRENT_DATE':
$expression->name('DATE')->add(["'now'" => 'literal']);
break;
case 'CURRENT_TIME':
$expression->name('TIME')->add(["'now'" => 'literal']);
break;
}
}
/**
* Transforms an insert query that is meant to insert multiple rows at a time,
* otherwise it leaves the query untouched.
*
* The way SQLite works with multi insert is by having multiple select statements
* joined with UNION.
*
* @return Query
*/
protected function _insertQueryTranslator($query) {
$v = $query->clause('values');
if (count($v->values()) === 1 || $v->query()) {
return $query;
}
$newQuery = $query->connection()->newQuery();
$cols = $v->columns();
foreach ($v->values() as $k => $val) {
$fillLength = count($cols) - count($val);
if ($fillLength > 0) {
$val = array_merge($val, array_fill(0, $fillLength, null));
}
$val = array_map(function($val) {
return $val instanceof ExpressionInterface ? $val : '?';
}, $val);
$select = array_combine($cols, $val);
if ($k === 0) {
$newQuery->select($select);
continue;
}
$q = $newQuery->connection()->newQuery();
$newQuery->unionAll($q->select($select));
}
if ($newQuery->type()) {
$v->query($newQuery);
}
return $query;
}
/**
* Get the schema dialect.
*
* Used by Cake\Database\Schema package to reflect schema and
* generate schema.
*
* @return Cake\Database\Schema\SqliteSchema
*/
public function schemaDialect() {
if (!$this->_schemaDialect) {
$this->_schemaDialect = new \Cake\Database\Schema\SqliteSchema($this);
}
return $this->_schemaDialect;
}
}