MySQL学习—–5

• 参考源 MySQL官方文档 PHP API

一、MySQL各种PHP语言接口

​ PHP共有三个MySQL API，在PHP5版本有$mysql \quad mysqli \quad PDO\_MySQL$。但是在PHP7 版本 便取消了 mysql 这种扩展，现在版本7可有两个选择$mysqli\quad PDO\_MySQL$。

​ 其中msqli API 与 PDO 为面向对象的，mysql 为 面向过程的(PHP 已经删除此扩展，可以使用phpinfo 来查看目前PHP版本支持的扩展)，其中mysqli也支持过程编程。

demo:

<?php

#mysql API
$fd=mysql_connect("hostname","username","password");
mysql_select_db("databaseName");
$query="select * from TableName";
$result=mysql_query($query);
$row=mysql_fetch_assoc($result);

foreach($row as $key => $value)
{
  echo $key."->".$value."<br/>";
}

#mysqli API
$mysql_fd=new mysqli("hostname","username","password","databaseName");
$query="select * from TableName";
$result=$mysql_fd->query($query);
$row=$result->fetch_assoc();
foreach($row as $key => $value)
{
  echo $key."->".$value."<br/>";
}

#PDO API
$pd=new PDO("mysql:host =hostname;dbname=datatbaseName","username","password");
$query="select * from TableName";
$result=$pd->query($query);
$row=$result->fetch(PDO::FETCH_ASSOC);
foreach($row as $key => $value)
{
  echo $key."->".$value."<br/>";
}

 ?>

• mysqli面向过程

  <?php
      $fd=mysqli_connect("localhost","root","password","database",3306);
      if(mysqli_connect_errno($fd))
      {
        echo "error".mysqli_connect_error();
      }
      else {
        echo "连接成功！\n";
        echo $fd->host_info."\n";
      }
  ?>

• mysqli面向过程

  <?php
  
  $fd=new mysqli("hostname","root","password","database",3306);
  if($fd->connect_error)
  {
  
      echo "error:(".$fd->connect_error.")".$fd->connect_errno."\n";
  
  }
  else {
    echo "连接成功！\n";
    echo $fd->host_info."\n";
  }
  ?>

• Date:Fri Sep 7 21:00:59 CST 2018