Codeigniter: relational database as Associative array like yii2 - codeigniter-2

Question

In Yii2, consider two tables parent and child. If child has a relation to the parent then while writing join query it will produce result like
Parent[id => 1,
firstname => "John",
lastName => "Miller"
child => [id : 1,
address : some address,
contact number : some nubmer
]
]
But in Codeignitor it is displayed as the same as an output of mysql query. how to achieve my requirement in CodeIgnitor.
Thanks in Advance.

Answer 1

There are various methods to accomplish this.
You can do a query for the parent and then cycle the childs
$query_parent = $this->db->query($"
SELECT *
FROM parent
WHERE id = ?", [$parent_id]);
if($query_parent !== FALSE && $query_parent->num_rows() > 0)
{
$result_array_parent = $query_parent->result_array();
$query_parent->free_result();
foreach ($result_array_parent as $k_p => $v_p)
{
$query_child = $this->db->query($"
SELECT *
FROM child
WHERE id = ?", [$v_p['id']);
if($query_child !== FALSE && $query_child->num_rows() > 0)
{
$result_array_child = $query_child->result_array();
$query_child->free_result();
foreach ($result_array_child as $k_c => $v_c)
{
$result_array_parent[$k_p]["child_".$k_c] = $v_c;
}
}
}
}
Or do a Join query and then transform it to an array.