Reference- what is wrong with my codeigniter code - php

Question

hello everyone i write a codeigniter function to return data fro database
this is my function
public function get_total_results($filtering = false)
{
if ($filtering) {
$this->get_filtering();
}
foreach ($this->joins as $val) {
$this->ci->db->join($val[0], $val[1], $val[2]);
}
foreach ($this->where as $val) {
$this->ci->db->where($val[0], $val[1], $val[2]);
}
foreach ($this->or_where as $val) {
$this->ci->db->or_where($val[0], $val[1], $val[2]);
}
foreach ($this->group_by as $val) {
$this->ci->db->group_by($val);
}
foreach ($this->like as $val) {
$this->ci->db->like($val[0], $val[1], $val[2]);
}
if (strlen($this->distinct) > 0) {
$this->ci->db->distinct($this->distinct);
$this->ci->db->select($this->columns);
}
$query = $this->ci->db->get($this->table, null, null, false);
return $query->num_rows();
}
but i get an error of
An uncaught Exception was encountered
Type: Error
Message: Call to a member function num_rows() on boolean
in line of return $query->num_rows();
i don't know what is wrong with my code that i got this error so i know the error in last line in returning result any suggestion or idea

Answer 1

The problem is that the line
$query = $this->ci->db->get($this->table, null, null, false);
// Note: all you really need is $this->ci->db->get($this->table);
It is assigning the value false to $query. That usually happens when Query Builder creates a SQL statement that does not make sense - it happens.
You can see what Query Builder creates this way
// comment out the get() call
// $this->ci->db->get($this->table);
// run this instead
$sql = $this->db->get_compiled_select($this->table);
echo $sql;
// remove the comments once you see where the problem is
//return $query->num_rows();
You will probably be able to see where the SQL statement syntax is wrong and adjust your earlier code accordingly.
You might want to add a check of the get() return to your logic, e.g.
$query = $this->ci->db->get($this->table);
// Is $query truthy? (not false, null, etc)
if(! empty($query))
{
return $query->num_rows();
}

Answer 2

get() method of codeigniter have syntax like:
get([$table = ''[, $limit = NULL[, $offset = NULL]]])
Parameters: $table (string) – The table to query $limit (int) – The
LIMIT clause $offset (int) – The OFFSET clause
Returns: CI_DB_result instance (method chaining)
Return type: CI_DB_result
You have passed more than three parameters. So, Please check the parameters. It may resolve your problem.
Refer this for more information.