Query in php on Codeigniter - php

Question

I can't use my query in php when i use codeigniter.
I think that it's all ok but my code doesn't work.
What is it wrong ?
I need to cofront two parametres.
I have a table and i need colonn3
Models:
function get_colonn3($data){
$this->db->select("table.colonn3");
$this->db->where("table.colonn3",$data);
return $this->db->get("table.colonn3")->result_array();
Controller:
$colonn3_exsist = $this->my_model->get_colonn3($data)
if($colonn3_exsist):
echo "ok";
endif;

Answer 1

Remove table.colon3 from get(), maybe it will work
return $this->db->get()->result_array();

Answer 2

I believe is because you're passing the table name to the where statement and it expects a column.
CodeIgniter where documentation
function get_colonn3($data) {
$this->db->select("table.colonn3");
$this->db->where("colonn3", $data);
return $this->db->get("table")->result_array();
}
They also allow you to pass an array to the where parameters too:
function get_colonn3($data) {
$this->db->select("table.colonn3");
$this->db->where([
"colonn3" => $data
]);
return $this->db->get("table")->result_array();
}
CI also allows you to chain DB functions like so:
function get_colonn3($data) {
$this->db->select("table.colonn3")
->where([
"colonn3" => $data
]);
return $this->db->get("table")->result_array();
}

Answer 3

try this:
//model
function get_colonn3($data){
$this->db->select("colonn3");
$this->db->where("colonn3",$data);
return $this->db->get("table")->result_array();
//controller
$colonn3_exsist = $this->my_model->get_colonn3($data)
if($colonn3_exsist>0){
echo"ok";
}

Answer 4

You are passing the value to WHERE in a wrong way. You have to pass the values in an array without passing the table name.
You have to pass the array in WHERE clause like this if you have more than one parameter to compare from Database:
function get_colonn3($para1,$para2){
$this->db->select("table.colonn3");
$this->db->where(['columnname1' => $para1, 'columnname2' => $para2]);
return $this->db->get("table.colonn3")->result_array();
}
If you have only one parameter to compare then you can use this:
function get_colonn3($para1){
$this->db->select("table.colonn3");
$this->db->where('columnname1',$para1);
return $this->db->get("table.colonn3")->result_array();
}

Answer 5

Model
function get_colonn3($data){
return $this->db->select("table.colonn3 as col3")->from('table')->where(['table.colonn3' => $data])->get()->row()->col3;
}
Controller
$colonn3 = $this->my_model->get_colonn3($data)
if(!empty($colonn3)):
echo "ok";
endif;