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CodeIgniter framework database basic operations
- 无忌哥哥Original
- 2018-07-12 09:11:571876browse
The examples in this article describe the basic operations of the CodeIgniter framework database. Share it with everyone for your reference, the details are as follows:
Start now, first move the CI framework to your own server directory and configure config/config.php
$config['base_url'] = 'http://localhost:90/CI/';
Then configure the database in config/ I configured databases.php for practice as follows
$db['default']['hostname'] = 'localhost'; $db['default']['username'] = 'root'; $db['default']['password'] = 'root'; $db['default']['database'] = 'demo'; $db['default']['dbdriver'] = 'mysql';
Otherwise, novices now have no need to create a database and a user table. This is in my source code package and you can import it directly, but the prerequisite You want to create a demo database
The reg class code is as follows
<?php
/***************************************
* 用户注册模块和数据库的基本操作实践
* 17:44 2013.2.18
* @Author sdeep wang
***************************************/
class Reg extends CI_Controller{
function __construct(){//此函数每次必须写是继承父类的方法
parent::__construct();
$this->load->database();//这个是连接数据库的方法，放到这里的好处只要调用该方法就会连接数据库
}
function index(){
$this->load->view('reg_view');//这个是使用哪个视图来显示相当于Smarty中的display
}
function reg_insert(){
$data['name'] = $this->input->post('name');//这个是指取得POST数组的值然后赋值一个心的数组
$data['sex'] = $this->input->post('sex');
$data['age'] = $this->input->post('age');
$data['pwd'] = md5($this->input->post('pwd'));//这里用了一个md5加密只是为了演示
$data['email'] = $this->input->post('email');
$this->db->insert('user',$data);//这个是数据库操作插入操作
redirect('/reg/reg_select/', 'refresh');//这个是跳转函数是url辅助函数里面的一个方法
}
function reg_select(){//这个查询数据库的方法
$this->db->select('id,name,sex,age,email');//这里是查询要显示的字段，可不能像我第一次这样写啊$this->db->select('id','name','sex','age','email');
$data['query'] = $this->db->get('user');//这个是取得数据（如果你上面写的和我第一次一样的话只能取的一个字段）
$this->load->view('select_view',$data);//这里是调用哪个视图并分配数据给指定视图显示
}
function reg_delete(){//删除数据的操作
$id = $this->input->get('id');//这里是取得get传过来的值
$this->db->where('id',$id);//这里是做where条件这个相当重要，如果没有这个你有可能把这个表数据都清空了
$this->db->delete('user');//删除指定id数据
redirect('/reg/reg_select/', 'refresh');//同上跳转
}
function reg_update(){//跟新数据的操作
$data['id'] = $this->input->get('id');//同上取的get传值过来的ID
$this->load->view('update_view',$data);//同上调用视图分配数据
}
function reg_com_update(){//这个是真正的跟新数据操作方法
$id = $this->input->post('id');//同上取得post中的id值
$data = array(//把post数组的值封装到新的数组中为了下面跟新操作用
'name'=>$this->input->post('name'),
'pwd'=>md5($this->input->post('pwd')),
'email'=>$this->input->post('email' )
);
if(!empty($id) && (count($data) > 1)){//判断id值是否传过来并且判断封装的数组是否有元素存在
$this->db->where('id',$id);//同上准备where条件
$this->db->update('user',$data);//跟新操作
}
redirect('/reg/reg_select/', 'refresh');//同上跳转
}
}
?>The view code is as follows
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>用户注册</title>
</head>
<body>
<form action="<?php echo site_url('reg/reg_insert/'); ?>" method="post">
<table>
<tr>
<td>
姓名:<input type="text" name="name" />
</td>
</tr>
<tr>
<td>
姓别:<input type="radio" name="sex" value="1" />男
<input type="radio" name="sex" />女
</td>
</tr>
<tr>
<td>
年龄:<input type="text" name="age" />
</td>
</tr>
<tr>
<td>
密码:<input type="password" name="pwd" />
</td>
</tr>
<tr>
<td>
邮件:<input type="text" name="email" />
</td>
</tr>
<tr>
<td>
<input type="submit" value="注册" />
<input type="reset" value="重置" />
</td>
</tr>
</table>
</form>
</body>
</html>The second view code is as follows
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>显示数据库中的所有注册用户</title>
<style>
*{
margin:0 auto;
}
table {
border:1px solid gray;
border-collapse: collapse;
width:500px;
text-align:center;
}
th,td {
border:1px solid gray;
}
</style>
</head>
<body>
<table>
<caption><h3>注册用户的显示</h3></caption>
<tr>
<th>ID</th>
<th>Name</th>
<th>Sex</th>
<th>Age</th>
<th>Email</th>
<th>Operate</th>
</tr>
<?php foreach($query->result() as $item):?>
<tr>
<td><?php echo $item->id; ?></td>
<td><?php echo $item->name; ?></td>
<td><?php echo $item->sex; ?></td>
<td><?php echo $item->age; ?></td>
<td><?php echo $item->email; ?></td>
<td>
<a href="<?php echo site_url('reg/reg_delete');?>?id=<?php echo $item->id;?>" rel="external nofollow" >删除</a> |
<a href="<?php echo site_url('reg/reg_update');?>?id=<?php echo $item->id;?>" rel="external nofollow" >修改</a>
</td>
</tr>
<?php endforeach; ?>
</table>
</body>
</html>
第三个视图如下
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>修改用户注册信息</title>
</head>
<body>
<form action="<?php echo site_url('reg/reg_com_update');?>" method="post">
<table>
<tr>
<td>姓名:<input type="text" name="name" /></td>
</tr>
<tr>
<td>密码:<input type="password" name="pwd" /></td>
</tr>
<tr>
<td>邮件:<input type="text" name="email" /></td>
</tr>
<tr>
<td>
<input type="submit" value="修改" />
<input type="hidden" name="id" value="<?php echo $id; ?>" />
</td>
</tr>
</table>
</form>
</body>
</html>The rendering is as follows
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