php - Codeigniter: how to check if username already exists from mysql database -
i'm working on codeigniter. not expert using framework. have registration form of employee , want display "username exists" beside username input after submit button.
here image of tables mysql database:
image of tables mysql database
here controller (home.php):
public function viewaddemployeeform() { $this->load->model('model_home'); $data = array(); $data['dropdown'] = $this->model_home->get_dropdown(); $this->load->view('imports/header'); $this->load->view('imports/menu'); $this->load->view('emp_add', $data); } public function saveemployee() { $this->load->model('model_home'); $p = new model_home(); $p->date_employed = $this->input->post('date_emp'); $p->designation_id = $this->input->post('emp_desi'); $p->username = $this->input->post('username'); $p->password = $this->input->post('pswrd'); $p->name = $this->input->post('emp_name'); $p->midname = $this->input->post('emp_mname'); $p->lastname = $this->input->post('emp_lname'); $p->cityaddress = $this->input->post('emp_cadd'); $p->license_num = $this->input->post('emp_license'); $p->tin_num = $this->input->post('emp_tin'); $p->sssno = $this->input->post('emp_sss'); $p->philhealth = $this->input->post('emp_ph'); $p->dob = $this->input->post('emp_dob'); $p->gender = $this->input->post('emp_gender'); $p->contnum = $this->input->post('emp_mobno'); $p->contactperson = $this->input->post('emp_contpers'); $p->contactperson_num = $this->input->post('emp_contpersnum'); $p->contactperson_add = $this->input->post('emp_contpersadd'); if($p->designation_id == 1){ $p->user_type = 0; }else{ $p->user_type = 1; } $result = $p->saveemployee(); if (!$result) { echo mysqli_error($result); } else { redirect('home/gosettings', 'refresh'); } } here view: (emp_add.php):
<h1>add employee</h1> <br> <?php echo form_open('home/saveemployee',array('class'=>'form-horizontal'));?> <h4> personal information </h4> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12" for="first-name">first name <span class="required">*</span> </label> <div class="col-md-6 col-sm-6 col-xs-12"> <input type="text" id="emp_name" name="emp_name" required="required" class="form-control col-md-7 col-xs-12"> </div> </div> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12" for="last-name">last name <span class="required">*</span> </label> <div class="col-md-6 col-sm-6 col-xs-12"> <input type="text" id="emp_lname" name="emp_lname" required="required" class="form-control col-md-7 col-xs-12"> </div> </div> <div class="form-group"> <label for="middle-name" class="control-label col-md-3 col-sm-3 col-xs-12">middle name / initial</label> <div class="col-md-6 col-sm-6 col-xs-12"> <input id="emp_mname" name="emp_mname" class="optional form-control col-md-7 col-xs-12" type="text"> </div> </div> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12">gender</label> <div class="col-md-6 col-sm-6 col-xs-12"> <div id="gender" class="btn-group" data-toggle="buttons"> <select id="emp_gender" name="emp_gender" class="form-control"> <option id="emp_gender" name="emp_gender" value="male">male</option> <option id="emp_gender" name="emp_gender" value="female">female</option> </select> </div> </div> </div> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12">date of birth <span class="required">*</span> </label> <div class="col-md-6 col-sm-6 col-xs-12"> <input id="emp_dob" name="emp_dob" class="date-picker form-control col-md-7 col-xs-12" required="required" type="date"> </div> </div> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12">address <span class="required">*</span> </label> <div class="col-md-6 col-sm-6 col-xs-12"> <input id="emp_cadd" name="emp_cadd" class="form-control col-md-7 col-xs-12" required="required" type="text"> </div> </div> <h4> employee identification </h4> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12">license number</label> <div class="col-md-6 col-sm-6 col-xs-12"> <input type="text" id="emp_license" name="emp_license" class="optional form-control"> </div> </div> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12">tin number</label> <div class="col-md-6 col-sm-6 col-xs-12"> <input type="text" id="emp_tin" name="emp_tin" class="optional form-control"> </div> </div> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12">sss number</label> <div class="col-md-6 col-sm-6 col-xs-12"> <input type="text" id="emp_sss" name="emp_sss" class="optional form-control" > </div> </div> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12">philhealth</label> <div class="col-md-6 col-sm-6 col-xs-12"> <input type="text" id="emp_ph" name="emp_ph" class="optional form-control" > </div> </div> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12">username <span class="required">*</span> </label> <div class="col-md-6 col-sm-6 col-xs-12"> <input type="text" id="username" name="username" required="required" class="form-control col-md-7 col-xs-12" onblur="return check_username();"> <div id="info"></div> </div> </div> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12">password <span class="required">*</span> </label> <div class="col-md-6 col-sm-6 col-xs-12"> <input type="password" id="pswrd" name="pswrd" required="required" class="form-control col-md-7 col-xs-12"> </div> </div> <h4> work details </h4> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12">date employed <span class="required">*</span> </label> <div class="col-md-6 col-sm-6 col-xs-12"> <input id="date_emp" name="date_emp" class="date-picker form-control col-md-7 col-xs-12" required="required" type="date"> </div> </div> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12">designation <span class="required">*</span> </label> <div class="col-md-6 col-sm-6 col-xs-12"> <?php echo form_dropdown('emp_desi', $dropdown, '', 'class="form-control" id="emp_desi"'); ?> </div> </div> <h4> contact information </h4> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12">mobile number <span class="required">*</span></label> <div class="col-md-6 col-sm-6 col-xs-12"> <input type="text" id="emp_mobno" name="emp_mobno" class="form-control" required="required" > </div> </div> <h4> contact person </h4> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12">name <span class="required">*</span> </label> <div class="col-md-6 col-sm-6 col-xs-12"> <input type="text" id="emp_contpers" name="emp_contpers" required="required" class="form-control col-md-7 col-xs-12"> </div> </div> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12">address <span class="required">*</span> </label> <div class="col-md-6 col-sm-6 col-xs-12"> <input type="text" id="emp_contpersadd" name="emp_contpersadd" required="required" class="form-control col-md-7 col-xs-12"> </div> </div> <div class="form-group"> <label class="control-label col-md-3 col-sm-3 col-xs-12">mobile number <span class="required">*</span></label> <div class="col-md-6 col-sm-6 col-xs-12"> <input type="text" id="emp_contpersnum" name="emp_contpersnum" required="required" class="form-control" > </div> </div> <div class="ln_solid"></div> <div class="form-group"> <div class="col-md-6 col-sm-6 col-xs-12 col-md-offset-3"> <button type="submit" class="btn btn-success" name="emp_submit" id="emp_submit" onclick="alert('you have added employee')">submit</button> </div> </div> </form> here model (model_home.php):
public function saveemployee() { if (isset($this->empnum)) { $query = $this->updateemployee(); } else { $query = $this->addemployee(); } return $query; } public function get_dropdown() { $result = $this->db->select('designation_id, designation')->get('designation')->result_array(); $dropdown = array(); foreach($result $r) { $dropdown[$r['designation_id']] = $r['designation']; } return $dropdown; }
try this
$this->form_validation->set_rules('username', 'username', 'required|is_unique[users.username]'); here is_unique[users.username], users refer users table & username refer field name in users table. automatically check username in users table.
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