php - 在 codeigniter 中发现数据库中有重复数据后显示提示

Question

需要一些关于检查数据是否已经存在于数据库中的帮助，系统将显示提示。所以这是代码:

在模型中:

public function check_name($str, $col)

    {
    $lname = $this->input->post('lastname');
    $fname = $this->input->post('firstname');

        $result = $this->db->get_where('patients', array(
            'firstname' => $lname ,
            'lastname' => $fname
            ));
        if($result->num_rows() > 0){
             // $this->form_validation->set_message('check_name', 'The %s field already exists.');
            echo "Patient with the same name already exists.";

        }  else {
             return true;
        }
    }

在我的 Controller 中调用它的正确方法是什么。上面的代码似乎不起作用。

Answer 1

您的函数中有两个未在任何地方使用的参数。尝试这样做:

public function check_name($firstname, $lastname)
{
    /*
    $firstname = $this->input->post('lastname');
    $lastname = $this->input->post('firstname');
    */

$query = $this->db->query("SELECT firstname, lastname FROM patients WHERE firstname = ".$firstname." AND lastname = ".$lastname." ");    

if($query->num_rows() == 0){
// $this->form_validation->set_message('check_name', 'The %s field already exists.');
echo "Patient with the same name already exists.";

}  else {
return true;
}
}