CodeIgniter教程: 数据库(二)
例子
创建一个控制器类,命名为Stud_controller.php并保存在application/controller/Stud_controller.php
这里是一个完整的示例,其中包含了所有上述操作。在执行以下示例之前,按照本章开头的说明创建一个数据库和表,并对存储在application/config/database.php中的数据库配置文件进行必要的更改
<?php class Stud_controller extends CI_Controller { function __construct() { parent::__construct(); $this->load->helper('url'); $this->load->database(); } public function index() { $query = $this->db->get("stud"); $data['records'] = $query->result(); $this->load->helper('url'); $this->load->view('Stud_view',$data); } public function add_student_view() { $this->load->helper('form'); $this->load->view('Stud_add'); } public function add_student() { $this->load->model('Stud_Model'); $data = array( 'roll_no' => $this->input->post('roll_no'), 'name' => $this->input->post('name') ); $this->Stud_Model->insert($data); $query = $this->db->get("stud"); $data['records'] = $query->result(); $this->load->view('Stud_view',$data); } public function update_student_view() { $this->load->helper('form'); $roll_no = $this->uri->segment('3'); $query = $this->db->get_where("stud",array("roll_no"=>$roll_no)); $data['records'] = $query->result(); $data['old_roll_no'] = $roll_no; $this->load->view('Stud_edit',$data); } public function update_student(){ $this->load->model('Stud_Model'); $data = array( 'roll_no' => $this->input->post('roll_no'), 'name' => $this->input->post('name') ); $old_roll_no = $this->input->post('old_roll_no'); $this->Stud_Model->update($data,$old_roll_no); $query = $this->db->get("stud"); $data['records'] = $query->result(); $this->load->view('Stud_view',$data); } public function delete_student() { $this->load->model('Stud_Model'); $roll_no = $this->uri->segment('3'); $this->Stud_Model->delete($roll_no); $query = $this->db->get("stud"); $data['records'] = $query->result(); $this->load->view('Stud_view',$data); } } ?>
创建一个名为Stud_Model.php的Model类,并保存在application/models/Stud_Model.php。
<?php class Stud_Model extends CI_Model { function __construct() { parent::__construct(); } public function insert($data) { if ($this->db->insert("stud", $data)) { return true; } } public function delete($roll_no) { if ($this->db->delete("stud", "roll_no = ".$roll_no)) { return true; } } public function update($data,$old_roll_no) { $this->db->set($data); $this->db->where("roll_no", $old_roll_no); $this->db->update("stud", $data); } } ?>
创建一个名为Stud_add.php的视图文件,并将其保存在application/views/Stud_add.php。
<!DOCTYPE html> <html lang = "en"> <head> <meta charset = "utf-8"> <title>Students Example</title> </head> <body> <?php echo form_open('Stud_controller/add_student'); echo form_label('Roll No.'); echo form_input(array('id'=>'roll_no','name'=>'roll_no')); echo "<br/>"; echo form_label('Name'); echo form_input(array('id'=>'name','name'=>'name')); echo "<br/>"; echo form_submit(array('id'=>'submit','value'=>'Add')); echo form_close(); ?> </body> </html>
创建一个名为Stud_edit.php的视图文件,并将其保存在application/views/Stud_edit.php。
<!DOCTYPE html> <html lang = "en"> <head> <meta charset = "utf-8"> <title>Students Example</title> </head> <body> <form method = "" action = ""> <?php echo form_open('Stud_controller/update_student'); echo form_hidden('old_roll_no',$old_roll_no); echo form_label('Roll No.'); echo form_input(array('id'⇒'roll_no', 'name'⇒'roll_no','value'⇒$records[0]→roll_no)); echo " "; echo form_label('Name'); echo form_input(array('id'⇒'name','name'⇒'name', 'value'⇒$records[0]→name)); echo " "; echo form_submit(array('id'⇒'sub mit','value'⇒'Edit')); echo form_close(); ?> </form> </body> </html>
创建一个名为Stud_view.php的视图文件,并将其保存在application/views/Stud_view.php。
<!DOCTYPE html> <html lang = "en"> <head> <meta charset = "utf-8"> <title>Students Example</title> </head> <body> <a href = "<?php echo base_url(); ?> index.php/stud/add_view">Add</a> <table border = "1"> <?php $i = 1; echo "<tr>"; echo "<td>Sr#</td>"; echo "<td>Roll No.</td>"; echo "<td>Name</td>"; echo "<td>Edit</td>"; echo "<td>Delete</td>"; echo "<tr>"; foreach($records as $r) { echo "<tr>"; echo "<td>".$i++."</td>"; echo "<td>".$r->roll_no."</td>"; echo "<td>".$r->name."</td>"; echo "<td><a href = '".base_url()."index.php/stud/edit/" .$r->roll_no."'>Edit</a></td>"; echo "<td><a href = '".base_url()."index.php/stud/delete/" .$r->roll_no."'>Delete</a></td>"; echo "<tr>"; } ?> </table> </body> </html>
在application/config/routes.php的路由文件中进行以下更改,并在文件末尾添加以下行。
$route['stud'] = "Stud_controller"; $route['stud/add'] = 'Stud_controller/add_student'; $route['stud/add_view'] = 'Stud_controller/add_student_view'; $route['stud/edit/(\d+)'] = 'Stud_controller/update_student_view/$1'; $route['stud/delete/(\d+)'] = 'Stud_controller/delete_student/$1';
现在,让我们通过访问浏览器中的以下网址来执行这个示例。用你的网址替换yoursite.com。
http://yoursite.com/index.php/stud