xcorp1986/php-linq

linq v programovacím jazyce php naprogramovaný metodikou oop

php-linq

Linq technology in php language.

Install

composer require linq/php-linq ~1.0

class Linq

Base class that performs queries over the collections of objects and over the array.

List of methods

• from() - set primary source
• first() - return first item from collection
• last() - return last item from collection
• select($key = null, $key2 = null) - return result. You can use callable as first param
• count() - return length of collection
• take($offset, $length = null) - return first x items || return interval
• skip($offset) - skip x items a and return other data
• where($condition) - returns only elements that match a given condition
• reverse() - reverse collection
• orderBy($column, $desc = false) - sort. desc = descending. defalt asc = ascending
• distinct() - return unique items
• takeWhile($requirement) - combination = where(condition) + select()
• union($array) - union in sql
• groupBy($key) - Group data
• innerJoin($array) - return only elements that combine both fields
• leftJoin($array) - the first collection will list all entries, even those which do not connect with other collections
• on($condition) - Condition for join two collections
• in($filter) - Accepts an array of values which elements must acquire
• notIn($filter) - negation of "in" method
• onlyKeys($keys) - filtering data by key
• row_to_column($main_node) - split by a specific key. This key becomes a major hub

testing data

protected $students = array(
    array("name" => "Milan", "surname" => "Gallas", "age" => 20, "Job" => "php Programátor"),
    array("name" => "Amdrea", "surname" => "Novotná", "age" => 17, "Job" => "java Programátor"),
    array("name" => "Honza", "surname" => "Pulkert", "age" => 27, "Job" => "c# Programátor"),
    array("name" => "Nikola", "surname" => "Světnická", "age" => 23, "Job" => "php Programátor"),
    array("name" => "Nikola", "surname" => "Světnická", "age" => 23, "Job" => "php Programátor"),
    array("name" => "Petr", "surname" => "Grůdl", "age" => 31, "Job" => "java Programátor"),
);

protected $sports = array(
    array("userName" => "Milan", "sport" => "šachy", "active" => true),
    array("userName" => "Milan", "sport" => "karate", "active" => false),
    array("userName" => "Honza", "sport" => "box", "active" => true),
    array("userName" => "Honza", "sport" => "fotbal", "active" => false),
    array("userName" => "Milan", "sport" => "hokej", "active" => true),
    array("userName" => "Petr", "sport" => "tenis", "active" => true)
);

example of use

require 'vendor/autoload.php';

//init base linq class
$linq = \Linq\LinqFactory::createLinq();

//filtering data - select only users who are older than 23
$linq
	->from($userData)
	->where(function($item){
		if($item["age"] > 23) return $item;
	})

//clasic select
var_dump($linq->select());
//select data with function
var_dump(
		$linq->select(function($person){
			$person["age"]*=2;
			return $person;
		})
	);
//or
var_dump(
		$linq->select(function($user){
			//return $user["name"]  //you can try = return string
			return array("userName" => $user["name"]); //return array
		})
	);

//short select = less typing :D
var_dump( $linq->select("age") );  echo '<br>';
var_dump( $linq->select("name", "age") ); echo '<br>';
//$linq->select("name", "age") =>
var_dump(
	$linq->select(function($user){
		return array($user["name"] => $user["age"]);
	})
);



//full use with join method and groupBy
$linq
	->from($userData)
	//->innerJoin($sportData)
	->leftJoin($sportData)
	->on(function($user, $sport){
		return ($user["name"] == $sport["userName"]);
	})
	->groupBy("Job")
	->select()

class JsonLinq

The class takes data source in JSON format. Returns array.

testing data

$userJsonData = json_encode($userData);
$sportJsonData = json_encode($sportData);

example of use

$linq = \Linq\LinqFactory::createJsonLinq();

	echo '<pre>'; var_dump(
		$linq
			->from($userJsonData)
			->takeWhile(function($user){
				return ($user["Job"] === "php Programátor" && $user["age"] > 20);
			})
	);

class XmlLinq

The class takes data source in JSON format. Returns array.

The "from" method accept string or SimpleXmlElement. If out choose xml in string, so you will work with array. If you choose xml in SimlpeXmlElement object, so you will work with collection of std objects.

testing data

$sportXml =
'<sports>
     <sport>
         <userName>Milan</userName>
         <sport>šachy</sport>
         <active>true</active>
     </sport>
     <sport>
         <userName>Milan</userName>
         <sport>karate</sport>
         <active>false</active>
     </sport>
         <sport>
         <userName>Milan</userName>
         <sport>hokej</sport>
         <active>true</active>
         </sport>
     <sport>
         <userName>Honza</userName>
         <sport>box</sport>
         <active>true</active>
     </sport>
     <sport>
         <userName>Honza</userName>
         <sport>fotbal</sport>
         <active>false</active>
     </sport>
     <sport>
         <userName>Petr</userName>
         <sport>tenis</sport>
         <active>true</active>
     </sport>
</sports>';

//users
$userXml = '
<students>
     <student>
         <name>Milan</name>
         <surname>Gallas</surname>
         <age>20</age>
         <Job>php Programátor</Job>
     </student>
     <student>
         <name>Amdrea</name>
         <surname>Novotná</surname>
         <age>17</age>
         <Job>Java Programátor</Job>
     </student>
     <student>
         <name>Honza</name>
         <surname>Pulkert</surname>
         <age>27</age>
         <Job>c# Programátor</Job>
     </student>
     <student>
         <name>Nikola</name>
         <surname>Světnická</surname>
         <age>23</age>
         <Job>php Programátor</Job>
     </student>
     <student>
         <name>Nikola</name>
         <surname>Světnická</surname>
         <age>23</age>
         <Job>php Programátor</Job>
     </student>
     <student>
         <name>Petr</name>
         <surname>Grůdl</surname>
         <age>31</age>
         <Job>Java Programátor</Job>
     </student>
</students>
	';

example of use

    //first example. Source is string
	echo '<pre>';
	var_dump(
		\Linq\LinqFactory::createXmlLinq()
			->from($userXml)
			->leftJoin($sportXml)
			->on(function($user, $sport){
				return ($user["name"] == $sport["userName"]);
			})
			->select()
	);


	//second example group by and reverse - source is string
	echo "<pre>";
	var_dump(
		\Linq\LinqFactory::createXmlLinq()->from($userXml)->groupBy("Job", "name")->reverse()->select();
	);
	echo "</pre>";



	//third examlple - source is simpleXmlElement. use condition on collection of objects and sort by orderBy function descending
	$xmlElemetn = new SimpleXMLElement($userXml);
	echo '<pre>';
	var_dump(
		\Linq\LinqFactory::createXmlLinq()
			->from($xmlElemetn)
			->where(function($user){
				return (strlen($user->name) > 5);
			})
			->orderBy("age", true)
			->select()
	);