PHP基础封装简单的MysqliHelper类

MysqliHelper.class.php

[code]     [code] <?php

/**

* MysqliHelper

* [面向对象的MysqliHelper的简单封装]

*/

class MysqliHelper

{

private static $mysqli;

private static $host='localhost';

private static $uid='root';

private static $pwd='1234';

private static $dbName='test2';

    /**

* [connect 创建连接]

     */

public static function connect()

    {

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

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

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

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

}

    /**

* [execute_dml 执行增删改操作]

* @param  [string] $sql [DML语句]

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

     */

public static function execute_dml($sql)

    {

self::connect();

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

         if (!$result){

return -1;

  } else{

return self::$mysqli->affected_rows;

  }

}

    /**

* [execute_dql 执行查询操作]

* @param  [string] $sql [DQL语句]

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

     */

public static function execute_dql($sql)

    {

self::connect();

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

return $result;

}

    /**

* [show_table_data 显示表数据]

* @param  [string] $tableName [表名]

* @return [string]            [HTML]

     */

public static function show_table_data($tableName)

    {

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

//显示表头信息：

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

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

$fieldsCount = $result->field_count;

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

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

  }

$tableData.="</tr>";

//显示数据信息：

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

$tableData.="<tr>";

             foreach ($row as $value){

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

 }

    $tableData.="</tr>";

  }

$tableData.="</table>";

$result->free();

self::$mysqli->close();

//或者 mysqli_close(self::$mysqli);

echo $tableData;

}

}

?>

调用示例:

[code]
[code] <?php

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

//自定义MysqliHelper的测试与使用

//============================================

//引用自定义的MysqliHelper类

require_once "MysqliHelper.class.php";

// 查

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

// 增

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

// 删

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

// 改

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

//执行查询语句

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

//执行增删改语句

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

 if ($result==-1){

echo "操作失败:(";

} else{

echo "操作成功：".$result."行受影响";

}

//显示表数据

MysqliHelper::show_table_data("userinfo");

?>