Changing mysql result to "Class" with methods? - php

Question

I have seen these codes:
$result = $db->result($query);
$rows = $result->fetchAll();
how can I do similar effect? ($result contains methods?)

Answer 1

I think this is what you are looking for:
<?php
class test{
private $value = 0;
function foo(){
$this->value = 1;
return $this;
}
function bar(){
$this->value = 2;
echo $this->value;
}
}
$test = new test();
$result = $test->foo();
$result->bar();
?>
By having the method return itself, you can chain them together in this fashion.

Answer 2

Strictly speaking, you're asking about OOP in PHP, in which case, this is a reasonable example:
class HasResultMethod
{
public function result( $query )
{
return new HasFetchAllMethod();
}
}
class HasFetchAllMethod
{
public function fetchAll(){}
}
// you have a variable with a result method that has one parameter.
$result = $db->result($query);
// that returns an object which has a fetchAll method.
$rows = $result->fetchAll();
You probably are dealing with some wrapper around PDO, a library to interface with databases. Their query methods will return a PDOStatement which has methods which will allow you to get results from the DB. result is either a typo, or it behaves in a very similar way.

Answer 3

I got it already. What a great hint Headspin
http://sandbox.phpcode.eu/g/147bd.php
<?php
class foo{
function bar(){
return $this;
}
function fetch(){
echo "yeah";
}
}
$foo = new foo();
$result = $foo->bar();
$result->fetch();

Answer 4

That is easy
$db is instance of class that returnes class, so when you say
$db->result($query);
$db will return object
e.g.
//this method is inside $db class
function result($query)
{
$result = new Result();
$result->rows = mysql_query...
return $result;
}
and when you say
$result->fetchAll();
that is method inside class Result that will fetch all rows saved inside $result->rows;
e.g.
//method inside Result class
function fetchAll()
{
//fetch rows inside variable $this->rows
}
So basically what you can do with ORM (object relational mapping), you can return Array of objects, each object will represent one record from db
e.g.
Class User
{
var $ID;
var $Name;
var $LastName;
var $Email;
function load($row)
{
$this->ID = $row["ID"];
... etc
}
function save()
{
$sql = "update tbl_users set Name=:Name, LastName=:LastName, Email=:Email where ID=:ID";
//then execute your query
}
}
so how to get list of objects, its easy
select all records and add them into array
$ar = new Array();
for($i = 0; $i < count($rows); $i++)
{
$r = new User();
$r->load($rows[$i]);
}
return $ar;
simple as that...