本文实例讲述了PHP实现基于mysqli的Model基类。分享给大家供大家参考，具体如下：

DB.class.php:

//数据库连接类

class DB {

//获取对象句柄

static public function getDB() {

$_mysqli = new mysqli(DB_HOST,DB_USER,DB_PASS,DB_NAME);

if (mysqli_connect_errno()) {

echo '数据库连接错误！错误代码：'.mysqli_connect_error();

exit();

}

$_mysqli->set_charset('utf8');

return $_mysqli;

}

//清理，释放资源

static public function unDB(&$_result, &$_db) {

if (is_object($_result)) {

$_result->free();

$_result = null;

}

if (is_object($_db)) {

$_db->close();

$_db = null;

}

}

}

?>

Model.class.php:

//模型基类

class Model {

//执行多条SQL语句

public function multi($_sql) {

$_db = DB::getDB();

$_db->multi_query($_sql);

DB::unDB($_result = null, $_db);

return true;

}

//获取下一个增值id模型

public function nextid($_table) {

$_sql = "SHOW TABLE STATUS LIKE '$_table'";

$_object = $this->one($_sql);

return $_object->Auto_increment;

}

//查找总记录模型

protected function total($_sql) {

$_db = DB::getDB();

$_result = $_db->query($_sql);

$_total = $_result->fetch_row();

DB::unDB($_result, $_db);

return $_total[0];

}

//查找单个数据模型

protected function one($_sql) {

$_db = DB::getDB();

$_result = $_db->query($_sql);

$_objects = $_result->fetch_object();

DB::unDB($_result, $_db);

return Tool::htmlString($_objects);

}

//查找多个数据模型

protected function all($_sql) {

$_db = DB::getDB();

$_result = $_db->query($_sql);

$_html = array();

while (!!$_objects = $_result->fetch_object()) {

$_html[] = $_objects;

}

DB::unDB($_result, $_db);

return Tool::htmlString($_html);

}

//增删修模型

protected function aud($_sql) {

$_db = DB::getDB();

$_db->query($_sql);

$_affected_rows = $_db->affected_rows;

DB::unDB($_result = null, $_db);

return $_affected_rows;

}

}

?>

希望本文所述对大家PHP程序设计有所帮助。