导入导出csv文件

在工作中需要把csv文件数据导入数据库或者把数据库数据导出为csv文件。以下是我的简单的实现。

 <?php
 class csv
 {
     public $db_connection;
     public $table_name;
     public $file_path;

     public function __construct($db_connection,$table_name,$file_path)
     {
         $this->db_connection=$db_connection;
         $this->table_name=$table_name;
         $this->file_path=$file_path;
     }

     /*
     **把本地csv文件导入数据库
     */
     public function import()
     {
         $sql="insert ".$this->table_name." values ";
         $fp=fopen($this->file_path, "r");
         if($fp){
             while(($data=fgetcsv($fp,1000))!==FALSE){
                 $values="(";
                 $num=count($data);
                 for($c=0;$c<$num;$c++){
                     $data[$c]=str_replace("'", "\'", $data[$c]);
                     $values.="'".$data[$c]."',";
                 }
                 $values=substr($values,0,strlen($values)-1);
                 $values.="),";
                 $sql.=$values;
             }
         }
         $sql=substr($sql,0,strlen($sql)-1);
         $this->db_connection->exec($sql);
         fclose($fp);
         echo "Fairy sister Liu Yifei, BI master's idol!";
     }

     /*
     **把数据库表导出到本地csv文件
     */
     public function export()
     {
         $fp=fopen($this->file_path, "w");
         if($fp==TRUE){
             $sql="select * from ".$this->table_name." limit 300";
             foreach($this->db_connection->query($sql)->fetchAll() as $row){
                 $i=0;
                 foreach ($row as $key => $value) {
                     if($i%2==0){
                         unset($row[$key]);
                     }
                     $i++;
                 }
                 fputcsv($fp,$row);
             }
         }
         fclose($fp);
         echo "Fairy sister Liu Yifei, BI master's idol!";
     }
 }