MYSQLI operation class

<?php 
/** 
* Mysqli类 
* 
* @author 废墟 
* @version v1.0 2009-08-18 
* @link http://anerg.cn/ 
*/ 
class db_mysqli { 
protected $mysqli; 
protected $sql; 
protected $rs; 
protected $query_num    = 0; 
protected $fetch_mode    = MYSQLI_ASSOC; 
protected $cache_dir    = &#39;./cache/&#39;; 
protected $cache_time    = 1800; 
public function  __construct($dbhost, $dbuser, $dbpass, $dbname) { 
$this->mysqli    = new mysqli($dbhost, $dbuser, $dbpass, $dbname); 
if(mysqli_connect_errno()) { 
$this->mysqli    = false; 
echo &#39;<h2>&#39;.mysqli_connect_error().&#39;</h2>&#39;; 
die(); 
} else { 
$this->mysqli->set_charset("utf8"); 
} 
} 
public function  __destruct() { 
$this->free(); 
$this->close(); 
} 
protected function free() { 
@$this->rs->free(); 
} 
protected function close() { 
$this->mysqli->close(); 
} 
protected function fetch() { 
return $this->rs->fetch_array($this->fetch_mode); 
} 
protected function getQuerySql($sql, $limit = null) { 
if (@preg_match("/[0-9]+(,[ ]?[0-9]+)?/is", $limit) && !preg_match("/ LIMIT [0-9]+(,[ ]?[0-9]+)?$/is", $sql)) { 
$sql .= " LIMIT " . $limit; 
} 
return $sql; 
} 
protected function get_cache($sql,$method) { 
include_once &#39;./cache.php&#39;;//若框架中使用__autoload()，这里可以不用加载文件 
$cache    = new cache($this->cache_dir,$this->cache_time); 
$cache_file    = md5($sql.$method); 
$res    = $cache->get_cache($cache_file); 
if(!$res) { 
$res    = $this->$method($sql); 
$cache->set_cache($cache_file, $res); 
} 
return $res; 
} 
public function query_num() { 
return $this->query_num; 
} 
public function set_cache_dir($cache_dir) { 
$this->cache_dir    = $cache_dir; 
} 
public function set_cache_time($cache_time) { 
$this->cache_time    = $cache_time; 
} 
public function query($sql, $limit = null) { 
$sql    = $this->getQuerySql($sql, $limit); 
$this->sql    = $sql; 
$this->rs    = $this->mysqli->query($sql); 
if (!$this->rs) { 
echo "<h2>".$this->mysqli->error."</h2>"; 
die(); 
} else { 
$this->query_num++; 
return $this->rs; 
} 
} 
public function getOne($sql) { 
$this->query($sql, 1); 
$this->fetch_mode    = MYSQLI_NUM; 
$row = $this->fetch(); 
$this->free(); 
return $row[0]; 
} 
public function get_one($sql) { 
return $this->getOne($sql); 
} 
public function cache_one($sql) { 
$sql    = $this->getQuerySql($sql, 1); 
return $this->get_cache($sql, &#39;getOne&#39;); 
} 
public function getRow($sql, $fetch_mode = MYSQLI_ASSOC) { 
$this->query($sql, 1); 
$this->fetch_mode    = $fetch_mode; 
$row = $this->fetch(); 
$this->free(); 
return $row; 
} 
public function get_row($sql, $fetch_mode = MYSQLI_ASSOC) { 
return $this->getRow($sql);
} 
public function cache_row($sql) { 
$sql    = $this->getQuerySql($sql, 1); 
return $this->get_cache($sql, &#39;getRow&#39;); 
} 
public function getAll($sql, $limit = null, $fetch_mode = MYSQLI_ASSOC) { 
$this->query($sql, $limit); 
$all_rows = array(); 
$this->fetch_mode    = $fetch_mode; 
while($rows = $this->fetch()) { 
$all_rows[] = $rows; 
} 
$this->free(); 
return $all_rows; 
} 
public function get_all($sql, $limit = null, $fetch_mode = MYSQLI_ASSOC) { 
return $this->getAll($sql); 
} 
public function cache_all($sql, $limit = null) { 
$sql    = $this->getQuerySql($sql, $limit); 
return $this->get_cache($sql, &#39;getAll&#39;); 
} 
public function insert_id() { 
return $this->mysqli->insert_id(); 
} 
public function escape($str) { 
if(is_array($str)) { 
foreach($str as $key=>$val) { 
$str[$key] = $this->escape($val); 
} 
} else { 
$str = addslashes(trim($str)); 
} 
return $str; 
} 
} 
//用法 
$db    = new db_mysqli(&#39;localhost&#39;, &#39;root&#39;, 111222, &#39;dict&#39;); 
$db->set_cache_time(10); 
$db->set_cache_dir(&#39;./cache/sql/&#39;); 
$sql = "select * from words order by word_id limit 10,10"; 
$res1 = $db->get_all($sql); 
$res2 = $db->cache_all($sql); 
echo $db->query_num(),&#39;<br>&#39;; 
?>

Objects of the mysqli class mainly control the connection between PHP and MySQL database servers, select databases, send SQL statements to the MySQL server, and set character sets. These tasks are all done through the constructors, member methods and Member attributes are completed. In Table 13-1 and Table 13-2, the member methods and member attributes declared in the mysqli class are listed respectively.

Table 13-1 Member methods in the mysqli class (33 in total)