php框架codeigniter数据库操作整理
Tag:
-
1.
$query = $this->db->query('SELECT name, title, email from my_table');
foreach ($query->result() as $row)
{
echo $row->title;
echo $row->name;
echo $row->email;
}
2.
foreach ($query->result_array() as $row)
{
echo $row['title'];
echo $row['name'];
echo $row['email'];
}
3.
if ($query->num_rows() > 0)
4.
$query = $this->db->query('SELECT name from my_table LIMIT 1');
$row = $query->row();//$row = $query->row_array();
echo $row->name;
你可以传递参数以便获得某一行的数据。比如我们要获得第 5 行的数据:
$row = $query->row_array(5);
除此以外, 我们还可以使用下面的方法通过游标的方式获取记录:
$row = $query->first_row()
$row = $query->last_row()
$row = $query->next_row()
$row = $query->previous_row()
5.
$sql = "INSERT INTO mytable (title, name)
VALUES (".$this->db->escape($title).", ".$this->db->escape($name).")";
$this->db->query($sql);//$query = $this->db->get('table_name');
echo $this->db->affected_rows();
6.
$data = array(
'title' => $title,
'name' => $name,
'date' => $date
);
$this->db->insert('mytable', $data);
// Produces: INSERT INTO mytable (title, name, date) VALUES ('{$title}', '{$name}', '{$date}')
7.
$this->db->escape()
8.
$sql = "SELECT * from some_table WHERE id = ? AND status = ? AND author = ?";
$this->db->query($sql, array(3, 'live', 'Rick')); //自动转义
9.
该函数返回当前请求的字段数(列数):
$query = $this->db->query('SELECT * from my_table');
echo $query->num_fields();
10.
$query = $this->db->query('SELECT title from my_table');
foreach ($query->result() as $row)
{
echo $row->title;
}
$query->free_result(); // $query 将不再可用
$query2 = $this->db->query('SELECT name from some_table');
$row = $query2->row();
echo $row->name;
$query2->free_result(); // $query2 将不再可用
11.
$this->db->
相关文档:
PHP中的MYSQL常用函数总结
1、mysql_connect()-建立数据库连接
格式:
resource mysql_connect([string hostname [:port] [:/path/to/socket] [, string username] [, string password]])
例:
$conn = @mysql_connect("localhost", "username", "password") or dir( ......
<?php
function toFixLen($str,$len){ //固定长度字符串的截取
if($len>=strlen($str)||!$len) return $str;
$len-=3;
  ......
$client = new SoapClient('http://www.webxml.com.cn/WebServices/ChinaZipSearchWebService.asmx?WSDL');
#$ret = $client->__call('getSupportProvince', array());
#$ret = $client->__call('getSupportProvinceCity', array());
$ret = $client->__call('getSupportCity', array('callP ......
文档是这么说的:
PHP 的引用允许用两个变量来指向同一个内容。意思是,当这样做时:
<?php
$a
=&
$b
;
?>
这意味着 $a
和 $b
指向了同一个变量。
注: $a
和 $b
在这里是完全相同的,这并不是 $a
指向了 $b
或者相反,而是 $a
和 $b
指向了同一个地方。
所以:
<?ph ......
php特殊字符过滤
1、过滤标签(HTML):strip_tags()
例如:
<?php
$text = '<?php ?><p>Test paragraph.</p><!-- Comment -
-> <a href=http://topic.csdn.net/u/20090311/09/"#fragment">Other text</a>';
echo strip_tags($text);
echo "\n";
// 允许使用<p>和< ......