使用PHP怎么封装一个数据库处理类-创新互联
这篇文章主要介绍了使用PHP怎么封装一个数据库处理类,此处通过实例代码给大家介绍的非常详细,对大家的学习或工作具有一定的参考价值,需要的朋友可以参考下:
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php是一个嵌套的缩写名称,指的是英文超级文本预处理语言(php:Hypertext Preprocessor)的缩写,它的语法混合了C、Java、Perl以及php自创新的语法,主要用来做网站开发,许多小型网站都用php开发,因为php是开源的,从而使得php经久不衰。
MySQL的操作相关类,检查并使用了mysqli
0){ $args = func_get_args(); $this->host = $args[0]; $this->user = $args[1]; $this->pass = $args[2]; $this->connect(); } } //Function to tell us if mysqli is installed. private function mysqliinstalled (){ if (function_exists ("mysqli_connect")){ return true; } else { return false; } } //Function to connect to the database. private function connect (){ try { //Mysqli functionality. if ($this->mysqliinstalled()){ if (!$this->db = new mysqli ($this->host,$this->user,$this->pass)){ $exceptionstring = "Error connection to database:
"; $exceptionstring .= mysqli_connect_errno() . ": " . mysqli_connect_error(); throw new exception ($exceptionstring); } //Mysql functionality. } else { if (!$this->db = mysql_connect ($this->host,$this->user,$this->pass)){ $exceptionstring = "Error connection to database:
"; $exceptionstring .= mysql_errno() . ": " . mysql_error(); throw new exception ($exceptionstring); } } } catch (exception $e) { echo $e->getmessage(); } } //Function to select a database. public function selectdb ($thedb){ try { //Mysqli functionality. if ($this->mysqliinstalled()){ if (!$this->db->select_db ($thedb)){ $exceptionstring = "Error opening database: $thedb:
"; $exceptionstring .= $this->db->errno . ": " . $this->db->error; throw new exception ($exceptionstring); } //Mysql functionality. } else { if (!mysql_select_db ($thedb, $this->db)){ $exceptionstring = "Error opening database: $thedb:
"; $exceptionstring .= mysql_errno() . ": " . mysql_error(); throw new exception ($exceptionstring); } } } catch (exception $e) { echo $e->getmessage(); } } //Function to perform a query. public function execute ($thequery){ try { //Mysqli functionality. if ($this->mysqliinstalled()){ if (!$this->db->query ($thequery)){ $exceptionstring = "Error performing query: $thequery:
"; $exceptionstring .= $this->db->errno . ": " . $this->db->error; throw new exception ($exceptionstring); } else { echo "Query performed correctly: " . $this->db->affected_rows . " row(s) affected.
"; } //Mysql functionality. } else { if (!mysql_query ($thequery, $this->db)){ $exceptionstring = "Error performing query: $thequery:
"; $exceptionstring .= mysql_errno() . ": " . mysql_error(); throw new exception ($exceptionstring); } else { echo "Query performed correctly: " . mysql_affected_rows () . " row(s) affected.
"; } } } catch (exception $e) { echo $e->getmessage(); } } //Function to return a row set. public function getrows ($thequery){ try { //Mysqli functionality. if ($this->mysqliinstalled()){ if ($result = $this->db->query ($thequery)){ $returnarr = array (); while ($adata = $result->fetch_array ()){ $returnarr = array_merge ($returnarr,$adata); } return $returnarr; } else { $exceptionstring = "Error performing query: $thequery:
"; $exceptionstring .= $this->db->errno . ": " . $this->db->error; throw new exception ($exceptionstring); } //Mysql functionality. } else { if (!$aquery = mysql_query ($thequery)){ $exceptionstring = "Error performing query: $thequery:
"; $exceptionstring .= mysql_errno() . ": " . mysql_error(); throw new exception ($exceptionstring); } else { $returnarr = array (); while ($adata = mysql_fetch_array ($aquery)){ $returnarr = array_merge ($returnarr,$adata); } return $returnarr; } } } catch (exception $e) { echo $e->getmessage(); } } //Function to close the database link. public function __destruct() { try { //Mysqli functionality. if ($this->mysqliinstalled()){ if (!$this->db->close()){ $exceptionstring = "Error closing connection:
"; $exceptionstring .= $this->db->errno . ": " . $this->db->error; throw new exception ($exceptionstring); } //Mysql functionality. } else { if (!mysql_close ($this->db)){ $exceptionstring = "Error closing connection:
"; $exceptionstring .= mysql_errno() . ": " . mysql_error(); throw new exception ($exceptionstring); } } } catch (exception $e) { echo $e->getmessage(); } } } //Now, let us create an instance of mydb. $mydb = new mydb ("localhost","root",""); //Select a database to use. $mydb->selectdb ("wps"); //Now, let's perform an action. //$adata = $mydb->execute ("UPDATE cd SET title='Hybrid Theory' WHERE cdid='2'"); //Then, let's try to return a row set. $adata = $mydb->getrows ("SELECT * FROM wp_terms"); for ($i = 0; $i < count ($adata); $i++){ echo $adata[$i] . "
"; } $mydb->selectdb("test"); $result = $mydb->execute("UPDATE user SET age = 23 WHERE id = 2"); echo "
"; echo $result; ?>
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