Magento观察者，函数错误

我已经构建了这个函数，它将把记录插入到数据库中，我将在稍后使用。然而，一半的功能工作完美，另一半导致错误(错误不显示在日志中)

<?php
class Envato_CustomConfig_Model_Observer
{   
    public function adminSystemConfigChangedSection()
    {           
    /**
    *Insert new job Request
    *
    **/
        $tablename_c = Mage::getStoreConfig('customconfig_options/section_one/custom_field_one');
        $email = Mage::getStoreConfig('customconfig_options/section_two/custom_field_two');
        $days = Mage::getStoreConfig('customconfig_options/section_two/custom_field_three');
        $bind = array(
            'id'    => ' ',
            'tablename_c'   => $tablename_c,
            'email' => $email,
            'days'    => $days,
            'timeStamp' => now(),
        );
        //Open Database Conenction
        $write = Mage::getSingleton("core/resource")->getConnection("core_write");
        $query = "
        insert into Envato_CustomConfig_Job (Job_Id, tablename_colummname, email_template, days, timeStamp) 
        values (:id, :tablename_c, :email, :days, :timeStamp);
        ";
        $write->query($query, $bind);
    /**
    *Get Job Queue Ready
    *
    **/
        $res = "
        SELECT Job_Id, tablename_colummname, email_template, days  FROM Envato_CustomConfig_Job 
        WHERE tablename_colummname = :tablename_c 
        AND email_template = :email 
        AND days = :days 
        AND timeStamp =:timeStamp
        AND Job_Id != :id
        LIMIT 1;
        ";
        $result = $write->query($res, $bind);
        foreach($result as $record) {
            $Job_Id = $record['Job_Id'];
            $tablename_colummname = $record['tablename_colummname'];
            $days = $record['days'];
            $email_template = $record['email_template'];
            $email_Details[] = explode(".",$tablename_colummname);          
            if(!isset($email_Details['0']['2']))
            {
                $email_Details['0']['2'] = time();
            }
        }
        $bind = array(
            'Job_Id'    => $Job_Id,
            'tableName'   => $email_Details['0']['0'],
            'email' => $email_Details['0']['1'],
            'email_template' => $email_template,
            'days' => $days,
            'timeStamp' => $email_Details['0']['2'],
        );
        $query = "
        insert into Envato_CustomConfig_Job_Running (Job_Id, tableName, email, email_template, days, timeStamp) 
        values (:Job_Id, :tableName, :email, :email_template, :days, :timeStamp);
        ";
        $write->query($query, $bind);

下面的代码当包含在函数脚本停止工作时，这部分在Magento中不工作。在你建议把它分解成更小的函数之前，我已经尝试过了，但是当我运行或者甚至把另一个函数放在类中，这个网站不起作用。

switch ($bind['timeStamp']) {
        case is_numeric($bind['timeStamp']):
            //¨calculate email send date
            $email_Send_Date =  strtotime('+'.$bind['days'].' day', $bind['timeStamp']);
            $email_Send_Date = date('M d, Y', $email_Send_Date);
            $bind['timeStamp'] = date('M d, Y', $bind['timeStamp']);
            //Select Emails
            $selectBind = array(
            'email' => $email_Details['0']['1'],
            'tableName'   => $email_Details['0']['0'],
            );
            $res = "
            SELECT :email  FROM :tableName;
            ";
            $result = $write->query($res, $selectBind);
            foreach($result['email'] as $record) {      
            $binding = array(
                'Job_Id'    => $bind['Job_Id'],
                'email' => $record,
                'tableName'   => $bind['tableName'],
                'email_template' => $bind['email_template'],
                'timeStamp' => $bind['timeStamp'],
                'email_Send_Date' => $email_Send_Date,
            );

            $res = "
            insert into Envato_CustomConfig_Job_Queue
            values (:Job_Id, :email , :tableName, :email_template, :timeStamp, :email_Send_Date);
            ";
            $result = $write->query($res, $binding);
            }

            break;
        default:
            //timestamp is given.
            //Select Emails
            $selectBind = array(
            'email' => $email_Details['0']['1'],
            'timeStamp' => $email_Details['0']['2'],
            'tableName'   => $email_Details['0']['0'],
            );
            $res = "
            SELECT :email, :timeStamp  FROM :tableName;
            ";
            $result = $write->query($res, $selectBind);         
            $i = 0; 
            foreach ($result['timeStamp'] as $value) {  
                switch($value)
                {                                   
                case is_numeric($value):
                    // time()
                    $value = strtotime('+'.$bind['days'].' day', $value);
                    $value = date('M d, Y', $value);
                    break;
                default: 
                    // days + Unix
                    $value =  strtotime(str_replace(',', '', $value));
                    $value = strtotime('+'.$bind['days'].' day',$value);
                    $value = date('M d, Y', $value);
                    break;
                }
                $binding = array(
                'Job_Id'    => $bind['Job_Id'],
                'email' =>  $result['email'][$i],
                'tableName'   => $bind['tableName'],
                'email_template' => $bind['email_template'],
                'timeStamp' => $bind['timeStamp'],
                'email_Send_Date' => $value,
                );
                $res = "
                insert into Envato_CustomConfig_Job_Queue
                values (:Job_Id, :email , :tableName, :email_template, :timeStamp, :email_Send_Date);
                ";
                $result = $write->query($res, $binding);
                $i = $i+1;
            }
        break;
        }
    }
}
?>

编辑::

我已经分解了很多，并一直在调试代码。我得到了这个错误，我试图重写脚本，但最终结果仍然是一样的。对以下错误有什么想法吗??

保存配置时发生错误:SQLSTATE[42000]: Syntax error or access violation: 1064 SQL语法错误;检查与MySQL服务器版本对应的手册，以便在第1行"nfr_familypack"附近使用正确的语法，查询为:SELECT:email FROM:tableName;