codeigniter กับ การเชื่อมต่อฐานช้อมูล และการเพิ่ม ลบ แก้ไข แสดงรายการ

CREATE TABLE IF NOT EXISTS `tbl_admin` (
  `admin_id` int(3) unsigned NOT NULL,
  `admin_name` varchar(100) NOT NULL,
  `admin_pass` varchar(150) NOT NULL,
  `admin_adddate` datetime NOT NULL,
  `admin_lastlogin` datetime NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

ALTER TABLE `tbl_admin`
  ADD PRIMARY KEY (`admin_id`);

ALTER TABLE `tbl_admin`
  MODIFY `admin_id` int(3) unsigned NOT NULL AUTO_INCREMENT;

$active_group = 'default';
$query_builder = TRUE;

$db['default'] = array(
	'dsn'	=> '',
	'hostname' => 'localhost',
	'username' => 'root',
	'password' => '',
	'database' => 'test',
	'dbdriver' => 'mysqli',
	'dbprefix' => '',
	'pconnect' => FALSE,
	'db_debug' => (ENVIRONMENT !== 'production'),
	'cache_on' => FALSE,
	'cachedir' => '',
	'char_set' => 'utf8',
	'dbcollat' => 'utf8_general_ci',
	'swap_pre' => '',
	'encrypt' => FALSE,
	'compress' => FALSE,
	'stricton' => FALSE,
	'failover' => array(),
	'save_queries' => TRUE
);

'hostname' => 'localhost',
'username' => 'root',
'password' => '',
'database' => 'test',

'hostname' => 'localhost:3316',

$autoload['libraries'] = array('database','session');

$this->load->library('session');  // เรียกใช้งาน session

<?php  
defined('BASEPATH') OR exit('No direct script access allowed');  
  
class Admin extends CI_Controller {  
    
    public function __construct()
    {
            parent::__construct();
//            $this->load->library('session');  // เรียกใช้งาน session
    }  
..........
.....

<?php
$query = $this->db->query("SELECT * FROM tbl_admin");
foreach ($query->result_array() as $row)
{
        echo $row['admin_id']."<br>";
        echo $row['admin_name']."<br>";
        echo $row['admin_adddate']."<br>";
}                        
?>

<?php if($action==null){?>
<a href="<?=base_url('admin/user/create')?>" class="btn btn-primary btn-sm">Create</a>
<br><br>
<table class="table table-striped table-bordered table-condensed">
    <thead>
        <tr>
            <th width="50" class="text-center">#</th>
            <th>Name</th>
            <th width="150" class="text-center">Last Login</th>
            <th width="150" class="text-center">Manage</th>
        </tr>
    </thead>
    <tbody>
        <?php
        $i_num=0;
        $query = $this->db->query("SELECT * FROM tbl_admin");
        foreach ($query->result_array() as $row){
            $i_num++;
        ?>
        <tr>
            <td class="text-center"><?=$i_num?></td>
            <td><?=$row['admin_name']?></td>
            <td class="text-center"><?=$row['admin_adddate']?></td>
            <td class="text-center">
                <a href="<?=base_url('admin/user/edit/'.$row['admin_id'])?>" class="btn btn-success btn-sm">
                <span class="glyphicon glyphicon-pencil" aria-hidden="true"></span>
                </a>
                &nbsp;&nbsp;
                 <a href="<?=base_url('admin/user/delete/'.$row['admin_id'])?>" class="btn btn-danger btn-sm">
                <span class="glyphicon glyphicon-remove" aria-hidden="true"></span>
                </a>
                
            </td>
        </tr>
        <?php } ?>
    </tbody>
</table>
<?php } ?>

<?php
if(isset($_POST['btn_add']) && $_POST['btn_add']!=""){
    $p_username = $this->input->post('username');
    $p_password = $this->input->post('password');
    $v_adddate = date("Y-m-d H:i:s");
    $sql = "INSERT INTO tbl_admin (
        admin_id,
        admin_name,
        admin_pass,
        admin_adddate
    ) VALUES (
        NULL,
        ".$this->db->escape($p_username).",
        ".$this->db->escape($p_password).",
        ".$this->db->escape($v_adddate)."
    )";
    if($this->db->query($sql)){  // เมื่อเพิ่มข้อมูลแล้ว
        redirect('admin/user'); // ไปหน้า user
    }  
}
?>

<?php if($action=="create"){?>
<?php
if(isset($_POST['btn_add']) && $_POST['btn_add']!=""){
    $p_username = $this->input->post('username');
    $p_password = $this->input->post('password');
    $v_adddate = date("Y-m-d H:i:s");
    $sql = "INSERT INTO tbl_admin (
        admin_id,
        admin_name,
        admin_pass,
        admin_adddate
    ) VALUES (
        NULL,
        ".$this->db->escape($p_username).",
        ".$this->db->escape($p_password).",
        ".$this->db->escape($v_adddate)."
    )";
    if($this->db->query($sql)){  // เมื่อเพิ่มข้อมูลแล้ว
        redirect('admin/user'); // ไปหน้า user
    }  
}
?>
<a href="<?=base_url('admin/user')?>" class="btn btn-warning btn-sm">< Back</a>
<br><br>
<form action="<?=base_url('admin/user/create')?>" method="post">
<table class="table table-bordered">
<thead>
    <tr class="active">
        <th colspan="2">Create User</th>
    </tr>
</thead>
<tbody>
    <tr >
        <th width="120">Username:</th>
        <td>
            <input type="text" name="username">
        </td>
    </tr>
    <tr>
        <th width="120">Password:</th>
        <td>
        <input type="password" name="password" >
        </td>
    </tr>    
    <tr>
        <th></th>
        <td>
            <input type="submit" class="btn btn-success btn-sm" name="btn_add" value="Add User">
        </td>
    </tr>
</tbody>
</table>    
    

        
</form>
<?php } ?>

<?php
// เมื่อส่งข้อมูลฟอร์มเพื่อแก้ไขข้อมูล
if(isset($_POST['btn_edit']) && $_POST['btn_edit']!=""){
    $p_username = $this->input->post('username');
    $p_password = $this->input->post('password');
    $sql = "UPDATE tbl_admin SET
    admin_name = ".$this->db->escape($p_username).",
    admin_pass = ".$this->db->escape($p_password)."
    WHERE admin_id=".$this->db->escape($id);
    if($this->db->query($sql)){  // เมื่อแก้ไขข้อมูลเรียบร้อยแล้ว
        redirect('admin/user'); // ไปหน้า user
    }  
}
// แสดงข้อมูลของสมาชิกนั้นๆ ก่อนแก้ไข อ้างอิงจากตัวแปร $id 
$query = $this->db->query("SELECT * FROM tbl_admin WHERE admin_id=".$this->db->escape($id));
$row = $query->row_array();
?>

<?php if($action=="edit"){?>
<?php
// เมื่อส่งข้อมูลฟอร์มเพื่อแก้ไขข้อมูล
if(isset($_POST['btn_edit']) && $_POST['btn_edit']!=""){
    $p_username = $this->input->post('username');
    $p_password = $this->input->post('password');
    $sql = "UPDATE tbl_admin SET
    admin_name = ".$this->db->escape($p_username).",
    admin_pass = ".$this->db->escape($p_password)."
    WHERE admin_id=".$this->db->escape($id);
    if($this->db->query($sql)){  // เมื่อเพิ่มข้อมูลแล้ว
        redirect('admin/user'); // ไปหน้า user
    }  
}
// แสดงข้อมูลของสมาชิกนั้นๆ ก่อนแก้ไข อ้างอิงจากตัวแปร $id 
$query = $this->db->query("SELECT * FROM tbl_admin WHERE admin_id=".$this->db->escape($id));
$row = $query->row_array();
?>
<a href="<?=base_url('admin/user')?>" class="btn btn-warning btn-sm">< Back</a>
<br><br>
<form action="<?=base_url('admin/user/edit/'.$id)?>" method="post">
<table class="table table-bordered">
<thead>
    <tr class="active">
        <th colspan="2">Edit User</th>
    </tr>
</thead>
<tbody>
    <tr >
        <th width="120">Username:</th>
        <td>
            <input type="text" name="username" value="<?=$row['admin_name']?>">
        </td>
    </tr>
    <tr>
        <th width="120">Password:</th>
        <td>
        <input type="password" name="password" value="<?=$row['admin_pass']?>">
        </td>
    </tr>    
    <tr>
        <th></th>
        <td>
            <input type="submit" class="btn btn-success btn-sm" name="btn_edit" value="Edit User">
        </td>
    </tr>
</tbody>
</table>    
    

        
</form>
<?php } ?>

<?php if($action=="delete"){?>

<a href="<?=base_url('admin/user')?>" class="btn btn-warning btn-sm">< Back</a>
<br><br>
<?php
if($id){
    $sql = "DELETE FROM tbl_admin WHERE admin_id='".$this->db->escape($id)."' ";
    if($this->db->query($sql)){
}
?>
<div class="bg-success text-center" style="padding:10px;">
    <p class="text-success">Delete data completed</p>
    <a href="<?=base_url('admin/user')?>" class="text-success">< Back > </a>
</div>
    <?php } ?>
<?php } ?>

</div>

<div class="container">
    
Admin User
<br><br>
<?php if($action==null){?>
<a href="<?=base_url('admin/user/create')?>" class="btn btn-primary btn-sm">Create</a>
<br><br>
<table class="table table-striped table-bordered table-condensed">
    <thead>
        <tr>
            <th width="50" class="text-center">#</th>
            <th>Name</th>
            <th width="150" class="text-center">Last Login</th>
            <th width="150" class="text-center">Manage</th>
        </tr>
    </thead>
    <tbody>
        <?php
        $i_num=0;
        $query = $this->db->query("SELECT * FROM tbl_admin");
        foreach ($query->result_array() as $row){
            $i_num++;
        ?>
        <tr>
            <td class="text-center"><?=$i_num?></td>
            <td><?=$row['admin_name']?></td>
            <td class="text-center"><?=$row['admin_adddate']?></td>
            <td class="text-center">
                <a href="<?=base_url('admin/user/edit/'.$row['admin_id'])?>" class="btn btn-success btn-sm">
                <span class="glyphicon glyphicon-pencil" aria-hidden="true"></span>
                </a>
                &nbsp;&nbsp;
                 <a href="<?=base_url('admin/user/delete/'.$row['admin_id'])?>" class="btn btn-danger btn-sm">
                <span class="glyphicon glyphicon-remove" aria-hidden="true"></span>
                </a>
                
            </td>
        </tr>
        <?php } ?>
    </tbody>
</table>
<?php } ?>

<?php if($action=="create"){?>
<?php
if(isset($_POST['btn_add']) && $_POST['btn_add']!=""){
    $p_username = $this->input->post('username');
    $p_password = $this->input->post('password');
    $v_adddate = date("Y-m-d H:i:s");
    $sql = "INSERT INTO tbl_admin (
        admin_id,
        admin_name,
        admin_pass,
        admin_adddate
    ) VALUES (
        NULL,
        ".$this->db->escape($p_username).",
        ".$this->db->escape($p_password).",
        ".$this->db->escape($v_adddate)."
    )";
    if($this->db->query($sql)){  // เมื่อเพิ่มข้อมูลแล้ว
        redirect('admin/user'); // ไปหน้า user
    }  
}
?>
<a href="<?=base_url('admin/user')?>" class="btn btn-warning btn-sm">< Back</a>
<br><br>
<form action="<?=base_url('admin/user/create')?>" method="post">
<table class="table table-bordered">
<thead>
    <tr class="active">
        <th colspan="2">Create User</th>
    </tr>
</thead>
<tbody>
    <tr >
        <th width="120">Username:</th>
        <td>
            <input type="text" name="username">
        </td>
    </tr>
    <tr>
        <th width="120">Password:</th>
        <td>
        <input type="password" name="password" >
        </td>
    </tr>    
    <tr>
        <th></th>
        <td>
            <input type="submit" class="btn btn-success btn-sm" name="btn_add" value="Add User">
        </td>
    </tr>
</tbody>
</table>    
    

        
</form>
<?php } ?>


<?php if($action=="edit"){?>
<?php
// เมื่อส่งข้อมูลฟอร์มเพื่อแก้ไขข้อมูล
if(isset($_POST['btn_edit']) && $_POST['btn_edit']!=""){
    $p_username = $this->input->post('username');
    $p_password = $this->input->post('password');
    $sql = "UPDATE tbl_admin SET
    admin_name = ".$this->db->escape($p_username).",
    admin_pass = ".$this->db->escape($p_password)."
    WHERE admin_id=".$this->db->escape($id);
    if($this->db->query($sql)){  // เมื่อเพิ่มข้อมูลแล้ว
        redirect('admin/user'); // ไปหน้า user
    }  
}
// แสดงข้อมูลของสมาชิกนั้นๆ ก่อนแก้ไข อ้างอิงจากตัวแปร $id 
$query = $this->db->query("SELECT * FROM tbl_admin WHERE admin_id=".$this->db->escape($id));
$row = $query->row_array();
?>
<a href="<?=base_url('admin/user')?>" class="btn btn-warning btn-sm">< Back</a>
<br><br>
<form action="<?=base_url('admin/user/edit/'.$id)?>" method="post">
<table class="table table-bordered">
<thead>
    <tr class="active">
        <th colspan="2">Edit User</th>
    </tr>
</thead>
<tbody>
    <tr >
        <th width="120">Username:</th>
        <td>
            <input type="text" name="username" value="<?=$row['admin_name']?>">
        </td>
    </tr>
    <tr>
        <th width="120">Password:</th>
        <td>
        <input type="password" name="password" value="<?=$row['admin_pass']?>">
        </td>
    </tr>    
    <tr>
        <th></th>
        <td>
            <input type="submit" class="btn btn-success btn-sm" name="btn_edit" value="Edit User">
        </td>
    </tr>
</tbody>
</table>    
    

        
</form>
<?php } ?>

<?php if($action=="delete"){?>

<a href="<?=base_url('admin/user')?>" class="btn btn-warning btn-sm">< Back</a>
<br><br>
<?php
if($id){
    $sql = "DELETE FROM tbl_admin WHERE admin_id=".$this->db->escape($id);
    if($this->db->query($sql)){
}
?>
<div class="bg-success text-center" style="padding:10px;">
    <p class="text-success">Delete data completed</p>
    <a href="<?=base_url('admin/user')?>" class="text-success">< Back > </a>
</div>
    <?php } ?>
<?php } ?>

</div>