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：
创新互联公司专注于网站建设|
成都网站维护公司|优化|托管以及网络推广，积累了大量的网站设计与制作经验，为许多企业提供了网站定制设计服务，案例作品覆盖
成都社区文化墙等行业。能根据企业所处的行业与销售的产品，结合品牌形象的塑造，量身策划品质网站。
php有什么用
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;
?>到此这篇关于使用PHP怎么封装一个数据库处理类的文章就介绍到这了,更多相关使用PHP怎么封装一个数据库处理类的内容请搜索创新互联网站建设公司，以前的文章或继续浏览下面的相关文章希望大家以后多多支持创新互联网站建设公司，！
新闻标题：使用PHP怎么封装一个数据库处理类-创新互联
转载来于：
http://cdkjz.cn/article/dgepes.html
