本文实例讲述了PHP数据库处理封装类。分享给大家供大家参考，具体如下：
PHP;">
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: @H_404_5@";
$exceptionstring .= MysqLi_connect_errno() . ": " . MysqLi_connect_error();
throw new exception ($exceptionstring);
}
//MysqL functionality.
} else {
if (!$this->db = MysqL_connect ($this->host,$this->pass)){
$exceptionstring = "Error connection to database: @H_404_5@";
$exceptionstring .= MysqL_errno() . ": " . MysqL_error();
throw new exception ($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: @H_404_5@";
$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: @H_404_5@";
$exceptionstring .= MysqL_errno() . ": " . MysqL_error();
throw new exception ($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: @H_404_5@";
$exceptionstring .= $this->db->errno . ": " . $this->db->error;
throw new exception ($exceptionstring);
} else {
echo "Query performed correctly: " . $this->db->affected_rows . " row(s) affected.@H_404_5@";
}
//MysqL functionality.
} else {
if (!MysqL_query ($thequery,$this->db)){
$exceptionstring = "Error performing query: $thequery: @H_404_5@";
$exceptionstring .= MysqL_errno() . ": " . MysqL_error();
throw new exception ($exceptionstring);
} else {
echo "Query performed correctly: " . MysqL_affected_rows () . " row(s) affected.@H_404_5@";
}
}
} 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: @H_404_5@";
$exceptionstring .= $this->db->errno . ": " . $this->db->error;
throw new exception ($exceptionstring);
}
//MysqL functionality.
} else {
if (!$aquery = MysqL_query ($thequery)){
$exceptionstring = "Error performing query: $thequery: @H_404_5@";
$exceptionstring .= MysqL_errno() . ": " . MysqL_error();
throw new exception ($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: @H_404_5@";
$exceptionstring .= $this->db->errno . ": " . $this->db->error;
throw new exception ($exceptionstring);
}
//MysqL functionality.
} else {
if (!MysqL_close ($this->db)){
$exceptionstring = "Error closing connection: @H_404_5@";
$exceptionstring .= MysqL_errno() . ": " . MysqL_error();
throw new exception ($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] . "@H_404_5@";
}
$mydb->selectdb("test");
$result = $mydb->execute("UPDATE user SET age = 23 WHERE id = 2");
echo "@H_404_5@";
echo $result;
?>
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希望本文所述对大家PHP程序设计有所帮助。
原文链接：https://www.f2er.com/php/18209.html