<?php
/**
* CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (https://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. (https://cakefoundation.org)
* @link https://cakephp.org CakePHP(tm) Project
* @since 3.0.0
* @license https://opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\Database;
use Cake\Database\Expression\FunctionExpression;
/**
* Contains methods related to generating FunctionExpression objects
* with most commonly used SQL functions.
* This acts as a factory for FunctionExpression objects.
*/
class FunctionsBuilder
{
/**
* Returns a new instance of a FunctionExpression. This is used for generating
* arbitrary function calls in the final SQL string.
*
* @param string $name the name of the SQL function to constructed
* @param array $params list of params to be passed to the function
* @param array $types list of types for each function param
* @param string $return The return type of the function expression
* @return \Cake\Database\Expression\FunctionExpression
*/
protected function _build($name, $params = [], $types = [], $return = 'string')
{
return new FunctionExpression($name, $params, $types, $return);
}
/**
* Helper function to build a function expression that only takes one literal
* argument.
*
* @param string $name name of the function to build
* @param mixed $expression the function argument
* @param array $types list of types to bind to the arguments
* @param string $return The return type for the function
* @return \Cake\Database\Expression\FunctionExpression
*/
protected function _literalArgumentFunction($name, $expression, $types = [], $return = 'string')
{
if (!is_string($expression)) {
$expression = [$expression];
} else {
$expression = [$expression => 'literal'];
}
return $this->_build($name, $expression, $types, $return);
}
/**
* Returns a FunctionExpression representing a call to SQL RAND function.
*
* @return \Cake\Database\Expression\FunctionExpression
*/
public function rand()
{
return $this->_build('RAND', [], [], 'float');
}
/**
* Returns a FunctionExpression representing a call to SQL SUM function.
*
* @param mixed $expression the function argument
* @param array $types list of types to bind to the arguments
* @return \Cake\Database\Expression\FunctionExpression
*/
public function sum($expression, $types = [])
{
$returnType = 'float';
if (current($types) === 'integer') {
$returnType = 'integer';
}
return $this->_literalArgumentFunction('SUM', $expression, $types, $returnType);
}
/**
* Returns a FunctionExpression representing a call to SQL AVG function.
*
* @param mixed $expression the function argument
* @param array $types list of types to bind to the arguments
* @return \Cake\Database\Expression\FunctionExpression
*/
public function avg($expression, $types = [])
{
return $this->_literalArgumentFunction('AVG', $expression, $types, 'float');
}
/**
* Returns a FunctionExpression representing a call to SQL MAX function.
*
* @param mixed $expression the function argument
* @param array $types list of types to bind to the arguments
* @return \Cake\Database\Expression\FunctionExpression
*/
public function max($expression, $types = [])
{
return $this->_literalArgumentFunction('MAX', $expression, $types, current($types) ?: 'string');
}
/**
* Returns a FunctionExpression representing a call to SQL MIN function.
*
* @param mixed $expression the function argument
* @param array $types list of types to bind to the arguments
* @return \Cake\Database\Expression\FunctionExpression
*/
public function min($expression, $types = [])
{
return $this->_literalArgumentFunction('MIN', $expression, $types, current($types) ?: 'string');
}
/**
* Returns a FunctionExpression representing a call to SQL COUNT function.
*
* @param mixed $expression the function argument
* @param array $types list of types to bind to the arguments
* @return \Cake\Database\Expression\FunctionExpression
*/
public function count($expression, $types = [])
{
return $this->_literalArgumentFunction('COUNT', $expression, $types, 'integer');
}
/**
* Returns a FunctionExpression representing a string concatenation
*
* @param array $args List of strings or expressions to concatenate
* @param array $types list of types to bind to the arguments
* @return \Cake\Database\Expression\FunctionExpression
*/
public function concat($args, $types = [])
{
return $this->_build('CONCAT', $args, $types, 'string');
}
/**
* Returns a FunctionExpression representing a call to SQL COALESCE function.
*
* @param array $args List of expressions to evaluate as function parameters
* @param array $types list of types to bind to the arguments
* @return \Cake\Database\Expression\FunctionExpression
*/
public function coalesce($args, $types = [])
{
return $this->_build('COALESCE', $args, $types, current($types) ?: 'string');
}
/**
* Returns a FunctionExpression representing the difference in days between
* two dates.
*
* @param array $args List of expressions to obtain the difference in days.
* @param array $types list of types to bind to the arguments
* @return \Cake\Database\Expression\FunctionExpression
*/
public function dateDiff($args, $types = [])
{
return $this->_build('DATEDIFF', $args, $types, 'integer');
}
/**
* Returns the specified date part from the SQL expression.
*
* @param string $part Part of the date to return.
* @param string $expression Expression to obtain the date part from.
* @param array $types list of types to bind to the arguments
* @return \Cake\Database\Expression\FunctionExpression
*/
public function datePart($part, $expression, $types = [])
{
return $this->extract($part, $expression);
}
/**
* Returns the specified date part from the SQL expression.
*
* @param string $part Part of the date to return.
* @param string $expression Expression to obtain the date part from.
* @param array $types list of types to bind to the arguments
* @return \Cake\Database\Expression\FunctionExpression
*/
public function extract($part, $expression, $types = [])
{
$expression = $this->_literalArgumentFunction('EXTRACT', $expression, $types, 'integer');
$expression->setConjunction(' FROM')->add([$part => 'literal'], [], true);
return $expression;
}
/**
* Add the time unit to the date expression
*
* @param string $expression Expression to obtain the date part from.
* @param string $value Value to be added. Use negative to subtract.
* @param string $unit Unit of the value e.g. hour or day.
* @param array $types list of types to bind to the arguments
* @return \Cake\Database\Expression\FunctionExpression
*/
public function dateAdd($expression, $value, $unit, $types = [])
{
if (!is_numeric($value)) {
$value = 0;
}
$interval = $value . ' ' . $unit;
$expression = $this->_literalArgumentFunction('DATE_ADD', $expression, $types, 'datetime');
$expression->setConjunction(', INTERVAL')->add([$interval => 'literal']);
return $expression;
}
/**
* Returns a FunctionExpression representing a call to SQL WEEKDAY function.
* 1 - Sunday, 2 - Monday, 3 - Tuesday...
*
* @param mixed $expression the function argument
* @param array $types list of types to bind to the arguments
* @return \Cake\Database\Expression\FunctionExpression
*/
public function dayOfWeek($expression, $types = [])
{
return $this->_literalArgumentFunction('DAYOFWEEK', $expression, $types, 'integer');
}
/**
* Returns a FunctionExpression representing a call to SQL WEEKDAY function.
* 1 - Sunday, 2 - Monday, 3 - Tuesday...
*
* @param mixed $expression the function argument
* @param array $types list of types to bind to the arguments
* @return \Cake\Database\Expression\FunctionExpression
*/
public function weekday($expression, $types = [])
{
return $this->dayOfWeek($expression, $types);
}
/**
* Returns a FunctionExpression representing a call that will return the current
* date and time. By default it returns both date and time, but you can also
* make it generate only the date or only the time.
*
* @param string $type (datetime|date|time)
* @return \Cake\Database\Expression\FunctionExpression
*/
public function now($type = 'datetime')
{
if ($type === 'datetime') {
return $this->_build('NOW')->setReturnType('datetime');
}
if ($type === 'date') {
return $this->_build('CURRENT_DATE')->setReturnType('date');
}
if ($type === 'time') {
return $this->_build('CURRENT_TIME')->setReturnType('time');
}
}
/**
* Magic method dispatcher to create custom SQL function calls
*
* @param string $name the SQL function name to construct
* @param array $args list with up to 3 arguments, first one being an array with
* parameters for the SQL function, the second one a list of types to bind to those
* params, and the third one the return type of the function
* @return \Cake\Database\Expression\FunctionExpression
*/
public function __call($name, $args)
{
switch (count($args)) {
case 0:
return $this->_build($name);
case 1:
return $this->_build($name, $args[0]);
case 2:
return $this->_build($name, $args[0], $args[1]);
default:
return $this->_build($name, $args[0], $args[1], $args[2]);
}
}
}