PHP简单封装MysqlHelper类

MysqlHelper.class.php

   1: <?php

   2:  

   3: /**

   4:  * Mysql数据帮助类

   5:  */

   6: class MysqlHelper

   7: {

   8:     function __construct()

   9:     {

  10:         if(isset($conn)){return;}

  11:         //创建连接对象

  12:         $this->conn=@mysql_connect($this->host,$this->uid,$this->pwd);

  13:         if(!$this->conn){

  14:             die('连接数据库失败：'.mysql_error());

  15:         }

  16:  

  17:         //选择数据库和设置编码

  18:         mysql_select_db($this->db,$this->conn);

  19:         mysql_query('set names utf8');

  20:     }

  21:  

  22:     private $conn;

  23:     private $host='localhost';

  24:     private $uid='root';

  25:     private $pwd='1234';

  26:     private $db='test2';

  27:  

  28:     /**

  29:      * [execute_dql 执行查询语句]

  30:      * @param [string] $sql [查询语句]

  31:      */

  32:     public function execute_dql($sql)

  33:     {

  34:         $result = mysql_query($sql,$this->conn) or die('执行DQL语句时出错：'.mysql_error());

  35:         return $result;

  36:     }

  37:  

  38:     /**

  39:      * [execute_dml 执行增删改语句]

  40:      * @param [string] $sql [查询语句]

  41:      * @return [失败返回-1,无影响返回0,成功返回受影响的行数]

  42:      */

  43:     public function execute_dml($sql)

  44:     {

  45:         $result = mysql_query($sql,$this->conn) or die('执行DML语句时出错：'.mysql_error());

  46:         if(!$result){

  47:             return -1; //操作失败

  48:         }else{

  49:             return mysql_affected_rows($this->conn);

  50:         }

  51:     }

  52:  

  53:     /**

  54:      * [show_table_data 显示表数据]

  55:      * @param  [string] $tableName [表名]

  56:      * @return [string]            [HTML表格]

  57:      */

  58:     public function show_table_data($tableName)

  59:     {

  60:         $result = $this->execute_dql("select * from $tableName");

  61:  

  62:         $this->show_table($result);

  63:  

  64:         mysql_free_result($result);

  65:         mysql_close($this->conn);

  66:     }

  67:  

  68:     /**

  69:      * [show_table_info 显示表结构]

  70:      * @param  [string] $tableName [表名]

  71:      * @return [string]            [HTML表格]

  72:      */

  73:     public function show_table_info($tableName)

  74:     {

  75:         $result = $this->execute_dql("desc $tableName");

  76:  

  77:         $this->show_table($result);

  78:  

  79:         mysql_free_result($result);

  80:         mysql_close($this->conn);

  81:     }

  82:  

  83:     /**

  84:      * [show_table 拼接表格]

  85:      * @param  [resource] $result [结果集]

  86:      * @return [string]         [HTML]

  87:      */

  88:     public function show_table($result)

  89:     {

  90:         //显示表头信息：

  91:         echo "<br/>数据表：".mysql_field_table($result, 0)."  总行数：".mysql_num_rows($result);

  92:         $tableData="<table border='1' cellpadding='5'><tr>";

  93:         $fieldsCount = mysql_num_fields($result);

  94:         for ($i=0; $i <$fieldsCount; $i++) { 

  95:             $tableData.= "<th>".mysql_field_name($result, $i)."</th>";

  96:         }

  97:         $tableData.="</tr>";

  98:  

  99:         //显示数据信息：

 100:         while ($row = mysql_fetch_object($result)) {

 101:             $tableData.="<tr>";

 102:             foreach ($row as $value) {

 103:                 $tableData.="<td>$value</td>";

 104:             }

 105:             $tableData.="</tr>";

 106:         }

 107:         $tableData.="</table>";

 108:  

 109:         echo $tableData;

 110:     }

 111: }

 112:  

 113: ?>

调用示例：

   1: <?php

   2: header("Content-Type:text/html; charset=utf8");

   3:  

   4: //自定义MysqlHelper的测试与使用

   5: //============================================

   6:  

   7: //引用自定义的MysqlHelper类

   8: require_once "MysqlHelper.class.php";

   9:  

  10: //实例化MysqlHelper对象

  11: $execute = new MysqlHelper();

  12:  

  13: // 增

  14: $sql = "insert into userinfo(uName,uAge,uPwd) values('测试04',18,MD5('1234'));";

  15: // 删

  16: // $sql = "delete from userinfo where id=20";

  17: // 改

  18: // $sql = "update userinfo set uAge=19 where Id=21";

  19:  

  20: //对数据执行DML操作

  21: $returnNum = $execute->execute_dml($sql);

  22: if ($returnNum ==-1) {

  23:     echo "操作失败 :(";

  24: } else {

  25:     echo "操作成功:) <b style='color:red;'>".$returnNum."</b>行受影响<br/>";

  26: }

  27:  

  28:  

  29: //显示表信息：

  30: $execute->show_table_info("userinfo");

  31:  

  32: //显示表数据：

  33: $execute->show_table_data("userinfo");

  34:  

  35:  

  36: ?>