PHP基础封装简单的MysqliHelper类

MysqliHelper.class.php

   1: <?php

   2:  

   3: /**

   4: * MysqliHelper

   5: * [面向对象的MysqliHelper的简单封装]

   6: */

   7: class MysqliHelper

   8: {

   9:     private static $mysqli;

  10:     private static $host='localhost';

  11:     private static $uid='root';

  12:     private static $pwd='1234';

  13:     private static $dbName='test2';

  14:  

  15:     /**

  16:      * [connect 创建连接]

  17:      */

  18:     public static function connect()

  19:     {

  20:         if(isset(self::$mysqli))return;

  21:         self::$mysqli = new MySQLi(self::$host,self::$uid,self::$pwd,self::$dbName);

  22:         !empty(self::$mysqli) or die("数据库连接失败：".self::$mysqli->connect_error);

  23:         self::$mysqli->query("set names utf8");

  24:     }

  25:  

  26:     /**

  27:      * [execute_dml 执行增删改操作]

  28:      * @param  [string] $sql [DML语句]

  29:      * @return [int]      [操作成功返回受影响行数，否则返回-1]

  30:      */

  31:     public static function execute_dml($sql)

  32:     {

  33:         self::connect();

  34:         $result = self::$mysqli->query($sql) or die('执行DML语句时出错：'.self::$mysqli->error);

  35:         if (!$result) {

  36:             return -1;

  37:         } else {

  38:             return self::$mysqli->affected_rows;

  39:         }

  40:     }

  41:  

  42:     /**

  43:      * [execute_dql 执行查询操作]

  44:      * @param  [string] $sql [DQL语句]

  45:      * @return [mysqli_result]      [返回查询结果集]

  46:      */

  47:     public static function execute_dql($sql)

  48:     {

  49:         self::connect();

  50:         $result = self::$mysqli->query($sql) or die('执行DQL语句时出错：'.self::$mysqli->error);

  51:         return $result;

  52:     }

  53:  

  54:     /**

  55:      * [show_table_data 显示表数据]

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

  57:      * @return [string]            [HTML]

  58:      */

  59:     public static function show_table_data($tableName)

  60:     {

  61:         $result=self::execute_dql("select * from $tableName");

  62:         //显示表头信息：

  63:         echo "<br/>数据表：".$result->fetch_field()->table."  总行数：".$result->num_rows;

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

  65:         $fieldsCount = $result->field_count;

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

  67:             $tableData.= "<th>".$result->fetch_field_direct($i)->name."</th>";

  68:         }

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

  70:  

  71:         //显示数据信息：

  72:         while ($row = $result->fetch_object()) {

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

  74:             foreach ($row as $value) {

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

  76:             }

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

  78:         }

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

  80:  

  81:         $result->free();

  82:         self::$mysqli->close();

  83:         //或者 mysqli_close(self::$mysqli);

  84:         echo $tableData;

  85:     }

  86:  

  87: }

  88: ?>

 

调用示例:

 

   1: <?php

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

   3:  

   4: //自定义MysqliHelper的测试与使用

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

   6:  

   7: //引用自定义的MysqliHelper类

   8: require_once "MysqliHelper.class.php";

   9:  

  10: // 查

  11: // $sql = "select * from userinfo where id>8";

  12: // 增

  13: // $sql = "insert into userinfo(uName,uAge,uPwd) values('测试08',25,MD5('1234'));";

  14: // 删

  15: // $sql = "delete from userinfo where id=24";

  16: // 改

  17: $sql = "update userinfo set uAge=28 where Id=21";

  18:  

  19: //执行查询语句

  20: // $result = MysqliHelper::execute_dql($sql);

  21:  

  22: //执行增删改语句

  23: $result = MysqliHelper::execute_dml($sql);

  24: if ($result==-1) {

  25:     echo "操作失败:(";

  26: } else {

  27:     echo "操作成功：".$result."行受影响";

  28: }

  29:  

  30: //显示表数据

  31: MysqliHelper::show_table_data("userinfo");

  32:  

  33: ?>