2019-08-06 07:43
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在Codeigniter PHP中更新查询使记录为空

I am trying to update records(first_name,last_name) from MySQL using Codeigniter but if I do not update first_name OR last_name then record become empty from MySQL, I want existing record should not be removed/deleted,how can I do this? here is my code

$add_data['user_id'] = ($this->input->post('user_id') && !empty($this->input->post('user_id'))) ? $this->input->post('user_id') : NULL;     
$add_data['first_name'] = ($this->input->post('first_name') && !empty($this->input->post('first_name'))) ? $this->input->post('first_name') : NULL;     
$add_data['last_name'] = ($this->input->post('last_name') && !empty($this->input->post('last_name'))) ? $this->input->post('last_name') : NULL;     
$data = array(
$query=$this->db->update('users', $data);

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