如何使用Datamapper计算Codeigniter中查询返回的行数

Question

I am using the following query in controller of codeigniter.

    $u -> where('us_email_id', $username);
    $u -> where('us_password', $password1);
    $details = $u -> get();
    $total = count($details);
    echo $total; echo "<br>";
    echo count($details);

In the above code "$u" is the object name for the class "User" for the datamapper "User" where the table name in my database is "users". I want to see how many rows are returned after executing the query. "$total" always displays 1 even if userid and password is not matched. What I want is , if number of rows returned 1 then "ok" else "something wrong". I know its basic but if somebody know it then please help me out. Thanks in advance.

Answer 1

Following is availab in CI - checkout this page - http://codeigniter.com/user_guide/database/results.html

$query->num_rows()

The number of rows returned by the query. Note: In this example, $query is the variable that the query result object is assigned to:

$query = $this->db->query('SELECT * FROM my_table');

echo $query->num_rows(); 

so that in your example above you need to try

$details->num_rows();

Answer 2

If you just want to count the total rows found, call the count() method instead of get() .

$u->where('us_email_id', $username);
$u->where('us_password', $password1);
$total = $u->count();

But, if you also need the data, then you can simply call get() , and after that use PHP count() to count how many elements are there inside the all property of the object.

$u->where('us_email_id', $username);
$u->where('us_password', $password1);
$u->get();
$total = count($u->all);

You can check out the documentation for more details.

• Datamapper Count
• Datamapper Get

Answer 3

If the password was encrypted and try again

or if all the data part is fine the try to use the following code

$this->db->where(array('us_email_id' => $username,'us_password' => $password1));
echo $this->db->count_all_results('users');