leave a footprint
<?php
class pdodb{
//public protected private
//In this class, the connection will not be established without executing the SQL command.
//And after execution, there is an operation to close the connection and clear the result.
private $pdodb;//connection
private $res;//Remote result object
public $arr;//Local result array
private $cs=array(//connect the array
'host' =>'127.0.0.1',
'port' =>'3306',
'username' =>'root',
'password' =>'',
'dbname' =>'mysql',
'charset' =>'utf8',
);
//*********************************
//****************Singletonization************
//*********************************
//Three private and one public
private function __construct(){}//Invalidate new() new object
private function __clone(){}//Invalidate the cloned object.
private static $db;//Singleton object property
public static function getdb($arr=null)//Singleton object entry
{
if(!isset(self::$db))
{
self::$db=new self();
if($arr){
if(isset($arr['host']))self::$db->cs['host']=$arr['host'];
if(isset($arr['port']))self::$db->cs['port']=$arr['port'];
if(isset($arr['username']))self::$db->cs['username']=$arr['username'];
if(isset($arr['password']))self::$db->cs['password']=$arr['password'];
if(isset($arr['dbname']))self::$db->cs['dbname']=$arr['dbname'];
if(isset($arr['charset']))self::$db->cs['charset']=$arr['charset'];
}
}
return self::$db;
}
//connect
private function connect(){
//
//connection information
$dsn="mysql:host=".$this->cs['host'].//主机
";port=".$this->cs['port'].//Port
";dbname=".$this->cs['dbname'];//Database name
//login and password
$username=$this->cs['username'];
$password=$this->cs['password'];
//connect operation
try{
$this->pdodb = new PDO($dsn,$username,$password);
}catch (PDOException $e) {
echo "<br>Connection failed error:new PDO()---PDO:58 ";
echo "<br>". $e->getMessage() ;
die("<br>STOP!!!");
}
return $this->pdodb;
}
//set character set
private function charset($char='utf8'){
$this->pdodb->query("set names ".$char);
}
//USE database
private function usedb($dbname='mysql'){
$this->pdodb->query("use ".$dbname);
}
// database preparation
private function ready(){
$this->charset($this->cs['charset']);
$this->usedb($this->cs['dbname']);
}
//Execute the SQL command
//$sql---command:string
//$erro----Error switch: any value that is not NULL 0123....
private function query($sql,$erro=null){
$this->connect();
$this->ready();
$this->res = $this->pdodb->query($sql);
if($erro!==null){
if(!$this->res){
$error=$this->pdodb->errorInfo();
echo "<br>****************************";
echo "<br>Failed to execute";
echo "<br>命令:".$sql;
echo "<br>Customer code:".$error[0];
echo "<br>Error code:".$error[1];
echo "<br>Error message:".$error[2];
echo "<br>****************************";
die("<br>STOP!!!");
}
}
return $this->res;
}
// public command execution with return
//The return result is stored in $this-arr
//Result type array true/false three kinds
//parameter:
//$sql---MYSQL command
//$index--- returns the subscript type of the data, the default is the field subscript
// type: 'n'---numeric subscript
// 'a'---Field subscript
// 'b'---value/field (two kinds) double subscript
public function queryarr($sql=null,$index='a'){
if($sql==null){return $this->arr=false;}
//$r=$this->query($sql,0);//Add the second parameter to open the error
$this->query($sql);
// There are only three cases for the result object
//1. Executed correctly, but did not return a result set.---Boolean: true
//2. Execution failed---Boolean: false
//3. Correct execution, there is a return result, return an object----object:object
// The result can be retrieved from the object and stored in a local array
//Note one case, that is to return an empty array.array{}
if($this->res===true){
$this->arr=true;
}else{
if($this->res===false){
$this->arr=false;
}else{
//Get all data three types of subscripts
switch ($index) {
case 'a':
$this->arr=$this->res->fetchAll(PDO::FETCH_ASSOC);//Field subscript
break;
case 'n':
$this->arr=$this->res->fetchAll(PDO::FETCH_NUM);//Numerical subscript
break;
case 'b':
$this->arr=$this->res->fetchAll();//Double subscript
break;
}
$this->res->closeCursor();//Release the result object
}
}
//$this->pdodb->close();//Close the connection object
$this->pdodb=null;//How to reset PDO to close the connection object
$this->res=null;//After resetting the release result, the object still exists. So reset
return $this->arr;
}
//**********************
//Pure output data to table table
public function tab($arr)
{
if($arr===true)$arr=array(array("true"));
if($arr===false)$arr=array(array("false"));
if($arr===null)$arr=array(array("null"));
echo "<table border='1'>";
foreach($arr as $k1=>$v1)
{
//**********************
// header
if($k1==0)
{
echo "<tr>";
foreach($v1 as $k2=>$v2)
{
echo "<th>";
echo $k2;
echo "</th>";
}
echo "</tr>";
}
//**********************
//content
echo "<tr>";
foreach($v1 as $k2=>$v2)
{
echo "<td>";
echo $v2;
echo "</td>";
}
echo "</tr>";
}
echo "</table>";
}
//SQL character escape (to prevent SQL injection)----It seems a bit redundant here, but it's not.
public function quote($str){
$this->connect();
$s=$this->pdodb->quote($str);
$this->pdodb=null;//Disconnect from the database server
return $s;
}
public function getall($sql=null,$index='a'){
$a=$this->queryarr($sql,$index);
return $a;
}
public function getrow($sql=null,$index='a'){
$a=$this->queryarr($sql,$index);
return $a;
}
public function getone($sql=null,$index='n'){
$a=$this->queryarr($sql,$index);
if($a===true)return $a;
if($a===false)return $a;
if($a==null)return null;
return $a[0][0];
}
//test
public function test(){
/*
$a=123;
$b=$this->quote($a);
echo "<br>asdg asdf $b";
*/
//$sql="select session_content from session where session_id='$sess_id'";
//increase
//$sql="replace into session values('abcd','cccc',unix_timestamp())";
//$sql="replace into session values('aaaa','cccc',unix_timestamp())";
//$sql="insert into session values('abcd11','cccc1',unix_timestamp())";
//$sql="select * from session where session_id='abcd'";
//$sql="select * from session where session_id='abcd222'";
//$sql="set a=1";
$sql="select * from session ";
//$sql="select * from session where session_id='777'";
//$sql="select * from session";
//$sql=null;
//$this->query($sql,0);
$this->queryarr($sql);
//$a=$this->res->fetchAll(PDO::FETCH_ASSOC);//Field subscript
//$this->connect();
//echo "<pre>";
//var_dump($this->pdodb);
//var_dump($this->res);
//var_dump($this->arr);
//var_dump($a);
//echo "</pre>";
$this->tab($this->arr);
}
}
/*
$cs=array(//connect the array
'host' =>'127.0.0.1',
'port' =>'3306',
'username' =>'ddv1999',
'password' =>'1234abcd',
'dbname' =>'ddv1999',
'charset' =>'utf8',
);
$op1=pdodb::getdb($cs);
//echo "<pre>";
// var_dump ($ op1);
//echo "</pre>";
$op1->test();
*/