在此做个记录
PHP类的几个知识点
self::$静态属性名
$this->一般属性名或方法名
单例类 四个要点(三私一公)
1禁止构造对象---禁止new() private __construct(){} 私有空定义
2禁止克隆对象-- clone private __clone(){} 私有空定义
3定义单例对象属性 private static $对象名 私有静态空定义
4定义入口方法 public static function 方法名() 公共静态
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面向对向
<?php
class mysqli_object_db{
//*********************************
//public protected private
private $mysqli;//连接对象
private $result;//结果对象
public $arr;//结果数组
//定义连接参数
public $cs=array(
'host' =>'127.0.0.1',
'port' =>'3306',
'username' =>'root',
'password' =>'',
'dbname' =>'mysql',
'charset' =>'utf8',
);
//*********************************
//定义单例(三私一公)
//私有化静态对象
private static $db;
//私有化构造:禁止构造---new()
private function __construct(){}
//私有化克隆:禁止克隆
private function __clone(){}
//单例对象入口
public static function getdb($arr=null){
//如果不存在对象,则建立对象
if(!isset(self::$db)){self::$db=new self();}
//如果有连接参数
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;
}
//*****************************************
//连接成员方法
private function connect(){
//$this->db = @ new mysqli(
$this->mysqli = @ new mysqli(
$this->cs["host"].":".$this->cs["port"],
$this->cs["username"],
$this->cs["password"]
);
/* 检查连接 */
if (mysqli_connect_errno()) {
echo "<br>*************************************";
echo "<br>连接失败!!!";
echo "<br>错误代码:".mysqli_connect_errno();
echo "<br>错误信息:".mysqli_connect_error();
echo "<br>*************************************";
exit("<br>stop!!!");
}
}
//设置编码
private function charset($char="utf8"){
$this->mysqli->query("set names $char");
}
//打开数据库
private function usedb($dbname="mysql"){
$this->mysqli->query("use $dbname");
}
//数据库准备
private function ready(){
$this->charset($this->cs['charset']);
$this->usedb($this->cs['dbname']);
}
//执行SQL命令
//$sql---命令:string
//$erro----报错开关:任意不是NULL的值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>执行失败";
echo "<br>命令:".$sql;
echo "<br>错误代码:".$this->mysqli->errno;
echo "<br>错误信息:".$this->mysqli->error;
echo "<br>****************************";
die("<br>STOP!!!");
}
}
return $this->result;
}
//公开的有返回的命令执行
//返回结果保存在$this-arr
//结果类型 array true/false 三种
//参数:
//$sql---MYSQL命令
//$index---返回数据的下标类型,默认为字段下标
// 类型: 'n'---数值下标
// 'a'---字段下标
// 'b'---数值/字段(两种)双下标
public function queryarr($sql=null,$index='a'){
if($sql===null){return;}
//$r=$this->query($sql,0);//加第二个参数打开报错
$res=$this->query($sql);
//结果对象只有三种情况
//1.正确执行,但没有返回结果集.---布尔值:true
//2.执行失败---布尔值:false
//3.正确执行,有返回结果,返回一个对象----对象:object
//可以从对象中取出结果存入本地的数组
//注意一种情况,就是返回空数组.array{}
if($res===true){
$this->arr=true;
}else{
if($res===false){
$this->arr=false;
}else{
//取得全部数据 三类下标
switch ($index) {
case 'a':
$this->arr=$res->fetch_all(MYSQLI_ASSOC);//字段下标
break;
case 'n':
$this->arr=$res->fetch_all(MYSQLI_NUM);//数值下标
break;
case 'b':
$this->arr=$res->fetch_all(MYSQLI_BOTH);//双下标
break;
}
$res->free();//释放结果对象
}
}
$this->mysqli->close();//关闭连接对象
$this->mysqli=null;//复位
$this->result=null;//复位
return $this->arr;
}
//**********************
//纯输出数据到表格table
public function tab($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)
{
//**********************
//表头
if($k1==0)
{
echo "<tr>";
foreach($v1 as $k2=>$v2)
{
echo "<th>";
echo $k2;
echo "</th>";
}
echo "</tr>";
}
//**********************
//内容
echo "<tr>";
foreach($v1 as $k2=>$v2)
{
echo "<td>";
echo $v2;
echo "</td>";
}
echo "</tr>";
}
echo "</table>";
}
//SQL字符转义
public function escape($str){
$this->connect();
$s=$this->mysqli->escape_string($str);
$this->mysqli->close();//断开数据库服务器的连接
$this->mysqli=null;
return $s;
}
//测试成员方法
public function test(){
/*
$a=123;
$b=$this->escape($a);
echo "<br>asdg asdf $b";
*/
//$sql="select session_content from session where session_id='$sess_id'";
//增
//$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();
面向过程
<?php
class mysqli_process_db{
//*********************************
//public protected private
private $link;//连接对象
private $result;//结果对象
public $arr;//结果数组
//定义连接参数
public $cs=array(
'host' =>'127.0.0.1',
'port' =>'3306',
'username' =>'root',
'password' =>'',
'dbname' =>'mysql',
'charset' =>'utf8',
);
//*********************************
//定义单例(三私一公)
//私有化静态对象
private static $db;
//私有化构造:禁止构造---new()
private function __construct(){}
//私有化克隆:禁止克隆
private function __clone(){}
//单例对象入口
public static function getdb($arr=null){
//如果不存在对象,则建立对象
if(!isset(self::$db)){self::$db=new self();}
//如果有连接参数
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;
}
//*****************************************
//连接成员方法
private function connect(){
//$this->db = @ new mysql(
$this->link = @mysqli_connect(
$this->cs["host"].":".$this->cs["port"],
$this->cs["username"],
$this->cs["password"]
);
/* 检查连接 */
if (mysqli_connect_errno()) {
echo "<br>*************************************";
echo "<br>连接失败!!!";
echo "<br>错误代码:".mysqli_connect_errno();
echo "<br>错误信息:".mysqli_connect_error();
echo "<br>*************************************";
exit("<br>stop!!!");
}
}
//设置编码
private function charset($char="utf8"){
mysqli_query($this->link,"set names $char");
}
//打开数据库
private function usedb($dbname="mysql"){
mysqli_query($this->link,"use $dbname");
}
//数据库准备
private function ready(){
$this->charset($this->cs['charset']);
$this->usedb($this->cs['dbname']);
}
//执行SQL命令
//$sql---命令:string
//$erro----报错开关:任意不是NULL的值0123....
private function query($sql,$erro=null){
$this->connect();
$this->ready();
$this->result =mysqli_query($this->link,$sql);
if($erro!==null){
if(!$this->result){
echo "<br>****************************";
echo "<br>执行失败";
echo "<br>命令:".$sql;
echo "<br>错误代码:".mysqli_errno($this->link);
echo "<br>错误信息:".mysqli_error($this->link);
echo "<br>****************************";
die("<br>STOP!!!");
}
}
return $this->result;
}
//公开的有返回的命令执行
//返回结果保存在$this-arr
//结果类型 array true/false 三种
//参数:
//$sql---MYSQL命令
//$index---返回数据的下标类型,默认为字段下标
// 类型: 'n'---数值下标
// 'a'---字段下标
// 'b'---数值/字段(两种)双下标
public function queryarr($sql=null,$index='a'){
if($sql===null){return;}
//$res=$this->query($sql,0);//加第二个参数打开报错
$res=$this->query($sql);
//结果对象只有三种情况
//1.正确执行,但没有返回结果集.---布尔值:true
//2.执行失败---布尔值:false
//3.正确执行,有返回结果,返回一个对象----对象:object
//可以从对象中取出结果存入本地的数据
if($res===true){
$this->arr=true;
}else{
if($res===false){
$this->arr=false;
}else{
//取得数组全部
//MYSQLI_ASSOC/字段下标, MYSQLI_NUM/数字下标, MYSQLI_BOTH/字段和数字双下标
switch ($index) {
case 'a'://字段下标
$this->arr=mysqli_fetch_all($res,MYSQLI_ASSOC);
break;
case 'n'://数值下标
$this->arr=mysqli_fetch_all($res,MYSQLI_NUM);
break;
case 'b':
$this->arr=mysqli_fetch_all($res,MYSQLI_BOTH);
break;
}
mysqli_free_result ($res);//释放数据库服务器的结果资源
}
}
mysqli_close ($this->link);//断开数据库服务器的连接
$this->link=null;//复位
$this->result=null;//复位
return $this->arr;
}
//**********************
//纯输出数据到表格table
public function tab($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)
{
//**********************
//表头
if($k1==0)
{
echo "<tr>";
foreach($v1 as $k2=>$v2)
{
echo "<th>";
echo $k2;
echo "</th>";
}
echo "</tr>";
}
//**********************
//内容
echo "<tr>";
foreach($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);//断开数据库服务器的连接
$this->link=null;
return $s;
}
//测试成员方法
public function test(){
/*
$a=123;
$this->connect();
$b=mysqli_escape_string($this->link,$a);
mysqli_close ($this->link);//断开数据库服务器的连接
$this->link=null;
$c="asdf asd $b";
echo $c;
*/
//$sql="select session_content from session where session_id='$sess_id'";
//增
//$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);
}
}