make a note here
Several knowledge points of PHP class
self::$static property name
$this->General property name or method name
Four main points of singleton class (three private and one public)
1 Prohibition of constructing objects---prohibiting new() private __construct(){} private empty definition
2 Prohibit cloning objects -- clone private __clone(){} private empty definition
3 Define singleton object properties private static $object name private static empty definition
4 Define the entry method public static function method name () public static
face-to-face
<?php
class mysqli_object_db{
//*********************************
//public protected private
private $mysqli;//Connection object
private $result;//result object
public $arr;//Result array
//Define connection parameters
public $cs=array(
'host' =>'127.0.0.1',
'port' =>'3306',
'username' =>'root',
'password' =>'',
'dbname' =>'mysql',
'charset' =>'utf8',
);
//*********************************
//Define singleton (three private and one public)
//private static object
private static $db;
//Private construction: prohibit construction---new()
private function __construct(){}
//Private clone: Prohibit clone
private function __clone(){}
//Singleton object entry
public static function getdb($arr=null){
//If the object does not exist, create the object
if(!isset(self::$db)){self::$db=new self();}
//if there are connection parameters
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 member method
private function connect(){
//$this->db = @ new mysqli(
$this->mysqli = @ new mysqli(
$this->cs["host"].":".$this->cs["port"],
$this->cs["username"],
$this->cs["password"]
);
/* check connection */
if (mysqli_connect_errno()) {
echo "<br>*************************************";
echo "<br>Connection failed!!!";
echo "<br>Error code:".mysqli_connect_errno();
echo "<br>Error message:".mysqli_connect_error();
echo "<br>*************************************";
exit("<br>stop!!!");
}
}
//set encoding
private function charset($char="utf8"){
$this->mysqli->query("set names $char");
}
//open database
private function usedb($dbname="mysql"){
$this->mysqli->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->result = $this->mysqli->query($sql);
if($erro!==null){
if(!$this->result){
echo "<br>****************************";
echo "<br>Failed to execute";
echo "<br>命令:".$sql;
echo "<br>Error code:".$this->mysqli->errno;
echo "<br>Error message:".$this->mysqli->error;
echo "<br>****************************";
die("<br>STOP!!!");
}
}
return $this->result;
}
// 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;}
//$r=$this->query($sql,0);//Add the second parameter to open the error
$res=$this->query($sql);
// There are only three cases for the result object
//1. Executed correctly, but did not return a result set.---Boolean: true
//2. Execution failed---Boolean: false
//3. Correct execution, there is a return result, return an object----object:object
// The result can be retrieved from the object and stored in a local array
//Note one case, that is to return an empty array.array{}
if($res===true){
$this->arr=true;
}else{
if($res===false){
$this->arr=false;
}else{
//Get all data three types of subscripts
switch ($index) {
case 'a':
$this->arr=$res->fetch_all(MYSQLI_ASSOC);//Field subscript
break;
case 'n':
$this->arr=$res->fetch_all(MYSQLI_NUM);//Numerical subscript
break;
case 'b':
$this->arr=$res->fetch_all(MYSQLI_BOTH);//Double subscript
break;
}
$res->free();//Release the result object
}
}
$this->mysqli->close();//Close the connection object
$this->mysqli=null;//Reset
$this->result=null;//Reset
return $this->arr;
}
//**********************
//Pure output data to table table
public function tab($arr)
{
if(gettype($arr)!='array'){
if($arr===true){
$arr=array(array('true'));
}else{
$arr=array(array('false'));
}
}
if($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 $v2;
echo "</td>";
}
echo "</tr>";
}
echo "</table>";
}
//SQL character escape
public function escape($str){
$this->connect();
$s=$this->mysqli->escape_string($str);
$this->mysqli->close();//Disconnect from the database server
$this->mysqli=null;
return $s;
}
// test member method
public function test(){
/*
$a=123;
$b=$this->escape($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 ";
//$sql="select * from session where session_id='777'";
//$this->queryarr($sql);
//$this->connect();
//$this->ready();
//echo "<br>".$this->cs['charset'];
//echo "<pre>";
//var_dump($this->arr);
//echo "</pre>";
//$this->tab($this->arr);
}
}
$cs=array(
'host' =>'127.0.0.1',
'port' =>'3306',
'username' =>'xxxx',
'password' =>'1234abcd',
'dbname' =>'xxxx',
'charset' =>'utf8',
);
$op1=mysqli_object_db::getdb($cs);
echo "<pre>";
// var_dump ($ op1);
echo "</pre>";
$op1->test();
process oriented
<?php
class mysqli_process_db{
//*********************************
//public protected private
private $link;//Connection object
private $result;//result object
public $arr;//Result array
//Define connection parameters
public $cs=array(
'host' =>'127.0.0.1',
'port' =>'3306',
'username' =>'root',
'password' =>'',
'dbname' =>'mysql',
'charset' =>'utf8',
);
//*********************************
//Define singleton (three private and one public)
//private static object
private static $db;
//Private construction: prohibit construction---new()
private function __construct(){}
//Private clone: Prohibit clone
private function __clone(){}
//Singleton object entry
public static function getdb($arr=null){
//If the object does not exist, create the object
if(!isset(self::$db)){self::$db=new self();}
//if there are connection parameters
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 member method
private function connect(){
//$this->db = @ new mysql(
$this->link = @mysqli_connect(
$this->cs["host"].":".$this->cs["port"],
$this->cs["username"],
$this->cs["password"]
);
/* check connection */
if (mysqli_connect_errno()) {
echo "<br>*************************************";
echo "<br>Connection failed!!!";
echo "<br>Error code:".mysqli_connect_errno();
echo "<br>Error message:".mysqli_connect_error();
echo "<br>*************************************";
exit("<br>stop!!!");
}
}
//set encoding
private function charset($char="utf8"){
mysqli_query($this->link,"set names $char");
}
//open database
private function usedb($dbname="mysql"){
mysqli_query($this->link,"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();
$this->result =mysqli_query($this->link,$sql);
if($erro!==null){
if(!$this->result){
echo "<br>****************************";
echo "<br>Failed to execute";
echo "<br>命令:".$sql;
echo "<br>Error code:".mysqli_errno($this->link);
echo "<br>Error information:".mysqli_error($this->link);
echo "<br>****************************";
die("<br>STOP!!!");
}
}
return $this->result;
}
// 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;}
//$res=$this->query($sql,0);//Add the second parameter to open the error
$res=$this->query($sql);
// There are only three cases for the result object
//1. Executed correctly, but did not return a result set.---Boolean: true
//2. Execution failed---Boolean: false
//3. Correct execution, there is a return result, return an object----object:object
//The result can be retrieved from the object and stored in the local data
if($res===true){
$this->arr=true;
}else{
if($res===false){
$this->arr=false;
}else{
// get the entire array
//MYSQLI_ASSOC/Field subscript, MYSQLI_NUM/Number subscript, MYSQLI_BOTH/Field and number double subscript
switch ($index) {
case 'a'://Field subscript
$this->arr=mysqli_fetch_all($res,MYSQLI_ASSOC);
break;
case 'n'://numeric subscript
$this->arr=mysqli_fetch_all($res,MYSQLI_NUM);
break;
case 'b':
$this->arr=mysqli_fetch_all($res,MYSQLI_BOTH);
break;
}
mysqli_free_result ($res);//Release the result resource of the database server
}
}
mysqli_close ($this->link);//Disconnect the database server
$this->link=null;//Reset
$this->result=null;//Reset
return $this->arr;
}
//**********************
//Pure output data to table table
public function tab($arr)
{
if(gettype($arr)!='array'){
if($arr===true){
$arr=array(array('true'));
}else{
$arr=array(array('false'));
}
}
if($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 $v2;
echo "</td>";
}
echo "</tr>";
}
echo "</table>";
}
public function escape($str){
$this->connect();
$s=mysqli_escape_string($this->link,$str);
mysqli_close ($this->link);//Disconnect the database server
$this->link=null;
return $s;
}
// test member method
public function test(){
/*
$a=123;
$this->connect();
$b=mysqli_escape_string($this->link,$a);
mysqli_close ($this->link);//Disconnect the database server
$this->link=null;
$c="asdf asd $b";
echo $c;
*/
//$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 session_content from session where session_id='abcd'";
$this->queryarr($sql);
//$this->connect();
//$this->ready();
//echo "<br>".$this->cs['charset'];
//echo "<pre>";
//var_dump($this->arr);
//echo "</pre>";
$this->tab($this->arr);
}
}