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PHP introductory tutorial: Analysis of how to operate MySQL with PHP

高洛峰
高洛峰Original
2016-12-22 11:58:57927browse

The example in this article describes how to operate MySQL with PHP. Share it with everyone for your reference, the details are as follows:

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Demo1.php

<?php
  header(&#39;Content-Type:text/html; charset=utf-8;&#39;);
  //第一步,连接到 Mysql 服务器 3306
  //第二步参数,服务器地址;第二个参数,服务器的用户名;第三个参数,服务器密码
  //@ 如果出错了,不要出现警告或错误,直接忽略
  //die 函数之前,先连接一下,报错流程
  //echo (!!mysql_connect(&#39;localhost&#39;,&#39;root&#39;,&#39;123456&#39;));
// if(!$conn = @mysql_connect(&#39;localhost&#39;,&#39;root&#39;,&#39;123456&#39;)){
//   echo &#39;数据库连接失败,错误信息&#39;.mysql_error();
//   exit;
// }
// echo $conn;
// echo &#39;连接成功了,我才能显示!&#39;;
  //常量参数
  define(&#39;DB_HOST&#39;,&#39;localhost&#39;);
  define(&#39;DB_USER&#39;,&#39;root&#39;);
  define(&#39;DB_PWD&#39;,&#39;123456&#39;);
  define(&#39;DB_NAME&#39;,&#39;school&#39;);
  //第一步,连接数据库
  //mysql_connect -- 打开一个到 MySQL 服务器的连接
  $conn = @mysql_connect(DB_HOST,DB_USER,DB_PWD) or die(&#39;数据库连接失败,错误信息&#39;.mysql_error());
  //第二步,选择指定的数据库,设置字符集
  //mysql_select_db -- 选择 MySQL 数据库
  mysql_select_db(DB_NAME) or die (&#39;数据库错误,错误信息:&#39;.mysql_error());
  mysql_query(&#39;SET NAMES UTF8&#39;)or die(&#39;字符集设置错误,错误信息&#39;.mysql_error());
  //第三步,从这个数据库里选一张表(grade),然后把这个表的数据库提出(获取记录集)
  $query = "SELECT * FROM grade";
  //mysql_query -- 发送一条 MySQL 查询
  $result = mysql_query($query) or die (&#39;SQL错误:&#39;.mysql_error());
  //$result 就是记录集
  //第四步,将记录集里的数据显示出来
  print_r(mysql_fetch_array($result,MYSQL_NUM));//按照数字下标来显示
  //print_r(mysql_fetch_array($result,MYSQL_ASSOC)); //按照字符串下标来显示
  print_r(mysql_fetch_array($result,MYSQL_NUM));
  print_r(mysql_fetch_array($result,MYSQL_NUM));
  //第五步,释放记录集资源
  //mysql_free_result -- 释放结果内存
  mysql_free_result($result);
  //最后一步:关闭数据库
  //mysql_close -- 关闭 MySQL 连接
  echo mysql_close();
?>

config. php

<?php
  header(&#39;Content-Type:text/html; charset=utf-8;&#39;);
  //常量参数
  define(&#39;DB_HOST&#39;,&#39;localhost&#39;);
  define(&#39;DB_USER&#39;,&#39;root&#39;);
  define(&#39;DB_PWD&#39;,&#39;123456&#39;);
  define(&#39;DB_NAME&#39;,&#39;school&#39;);
  //第一步,连接MYSQL 服务器
  $conn = @mysql_connect(DB_HOST,DB_USER,DB_PWD) or die(&#39;数据库连接失败,错误信息&#39;.mysql_error());
  //第二步,选择指定的数据库,设置字符集
  mysql_select_db(DB_NAME) or die (&#39;数据库错误,错误信息:&#39;.mysql_error());
  mysql_query(&#39;SET NAMES UTF8&#39;)or die(&#39;字符集设置错误,错误信息&#39;.mysql_error());
?>

Demo2.php

<?php
  require &#39;config.php&#39;;
  //新增数据
// $query = "INSERT INTO grade (
//   name,
//   email,
//   point,
//   regdate)
// VALUES (
//   &#39;景临境&#39;,
//   &#39;jly@163.com&#39;,
//   &#39;78&#39;,
//   NOW()
// )";
  //$query = "INSERT INTO grade (name,email,point,regdate) VALUES (&#39;与共&#39;,&#39;abc@163.com&#39;,&#39;78&#39;,NOW() )";
  //mysql_query($query) or die(&#39;新增错误:&#39;.mysql_error());
  //修改数据
// $query = &#39;UPDATE grade SET point=66 WHERE id = 7&#39;;
// @mysql_query($query) or die(&#39;修改失败:&#39;.mysql_error());
  //删除数据
// $query = &#39;DELETE FROM grade WHERE id= 4&#39;;
// @mysql_query($query) or die(&#39;删除失败:&#39;.mysql_error());
  //显示数据
  $query = &#39;SELECT id,name,email FROM grade &#39;;
  $result = mysql_query($query) or die(&#39;SQL 语句有误:&#39;.mysql_error());
// $row = mysql_fetch_array($result);
// echo $row[2];
// $row = mysql_fetch_array($result);
// echo $row[2];
  //把结果集转换成数组赋给 $row ,如果有数据,就为真
  while (!!$row = mysql_fetch_array($result)){
    echo $row[&#39;id&#39;].&#39;----&#39;.$row[&#39;name&#39;].&#39;-----&#39;.$row[&#39;email&#39;];
    echo &#39;<br/>&#39;;
  }
  mysql_close();
?>

Demo3.php

<?php
  require &#39;config.php&#39;;
  //显示数据
  $query = &#39;SELECT id,email,name FROM grade &#39;;
  $result = mysql_query($query) or die(&#39;SQL 语句有误:&#39;.mysql_error());
// print_r(mysql_fetch_array($result));
// print_r(mysql_fetch_array($result,MYSQL_ASSOC));
// print_r(mysql_fetch_row($result));
// print_r(mysql_fetch_assoc($result));
// while (!!$row = mysql_fetch_array($result)){
//   echo $row[&#39;id&#39;].&#39;----&#39;.$row[&#39;name&#39;].&#39;-----&#39;.$row[&#39;email&#39;];
//   //print_r(mysql_fetch_lengths($result));
//   echo mb_strlen($row[&#39;name&#39;],&#39;utf-8&#39;);
//   echo &#39;<br/>&#39;;
// }
  //echo mysql_field_name($result,2); //name
  //echo mysql_num_fields($result); //3
  for($i=0; $i<mysql_num_fields($result);$i++){
    echo mysql_field_name($result,$i); //id----email----name----
    echo &#39;----&#39;;
  }
  echo &#39;<br/>&#39;;
  echo mysql_num_rows($result); //求出多少条数据
  echo &#39;<br/>&#39;;
  echo mysql_get_client_info();//取得 MySQL 客户端信息 //5.0.51a
  echo &#39;<br/>&#39;;
  echo mysql_get_host_info();//取得 MySQL 主机信息 //localhost via TCP/IP
  echo &#39;<br/>&#39;;
  echo mysql_get_proto_info();//取得 MySQL 协议信息 //10
  echo &#39;<br/>&#39;;
  echo mysql_get_server_info();//取得 MySQL 服务器信息 //5.0.51b-community-nt-log
  mysql_close();
?>

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