当我循环连接时出现太多连接错误

Question

我尝试通过PHP加载csv文件，我的csv文件有很多记录（300）。加载csv文件过程时，它仅上传25行，然后PDO错误出现“连接过多”。有什么方法可以加快插入过程吗？

while(($emapData = fgetcsv($file, 10000, ",")) !== FALSE){    
   try{    
      $dbcon = new PDO("mysql:host=$servername;dbname=$dbname",$username,$password);    
      $dbcon->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);    
      $stmt = $dbcon->prepare("INSERT INTO Palm_Growth(palm_id, vgm_date, vgm_stage, rachis_length, petiole_length) VALUES(nullif('$emapData[0]','NULL'), nullif('$emapData[1]','NULL'), nullif('$emapData[2]','NULL'), nullif('$emapData[3]','NULL'), nullif('$emapData[4]','NULL')");
      $stmt->execute();
   }
   catch(PDOException $e){
      echo "Error: " . $e->getMessage();
   }
}

Answer 1

在调用插入语句之前先设置数据库连接$dbcon。

$dbcon = new PDO("mysql:host=$servername;dbname=$dbname",$username,$password);

while(($emapData = fgetcsv($file, 10000, ",")) !== FALSE){    
    try{        
        $dbcon->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);    $stmt   = $dbcon->prepare("INSERT INTO Palm_Growth(palm_id, vgm_date, vgm_stage, rachis_length, petiole_length) VALUES(nullif('$emapData[0]','NULL'), nullif('$emapData[1]','NULL'), nullif('$emapData[2]','NULL'), nullif('$emapData[3]','NULL'), nullif('$emapData[4]','NULL')");

        $stmt->execute();
    }
    catch(PDOException $e){
    echo "Error: " . $e->getMessage();
}