Question

上传csv文件时，它会检查是否已插入电子邮件和电话号码。

我遇到了检查这些输入的if条件的问题。

对于mysqli_num_rows（）函数，我没有得到任何值，也会为CSV问题创建任何问题。

<?php

if(isset($_POST["Import"])){
    $filename=$_FILES["file"]["tmp_name"];
    if($_FILES["file"]["size"] > 0)
    {
        $file = fopen($filename, "r");
        while (($emapData = fgetcsv($file, 10000, ",")) !== FALSE)
        {
            $contractorId=$_SESSION['id'];
            $flag=false;

            $SQLCheckEmail = "SELECT * FROM user where USER_EMAIL='$emapData[1]'";
            $result_check_Email = @mysqli_query($conn,$SQLCheckEmail);
            $row_check_Email=mysqli_num_rows($result_check_Email);
            if($row_check_Email>0){
                $flag=true;
                echo "This user email ".$emapData[1]." has already been added.";
            }
            if($flag!=true){
                //It wiil insert a row to our subject table from our csv file`
                $sql = "INSERT into user (`contractor_id`,`USER_EMAIL`, `USER_ADDRESS`, `USER_PHONE`, `USER_NAME`,USER_SEX,USER_AGE,USER_BIRTHDAY) 
                        values('$contractorId','$emapData[1]','$emapData[2]','$emapData[3]','$emapData[4]','$emapData[5]','$emapData[6]','$emapData[7]')";
                 //we are using mysql_query function. it returns a resource on true else False on error
                $result = mysql_query( $sql, $conn );
                if(! $result )
                {
                    echo "<script type=\"text/javascript\">
                    alert(\"????????????CSV?????????????????\");
                    </script>";
                }
            }

         }
         fclose($file);
         if($flag!=true){
             //throws a message if data successfully imported to mysql database from excel file
             echo "<script type=\"text/javascript\">
                        alert(\"CSV???????????????\");
                        window.location = \"index.php\"
                    </script>";
         }
        //close of connection
        mysql_close($conn); 
     }
}    
?>

Answer 1

我不会在应用程序级别上解决这个问题。让数据库为您完成工作。对于每个记录执行单独的select语句将导致可怕的性能。

如果根据列email已存在条目，您似乎要检查。在该列上有一个unique索引。然后你可以简单地做

LOAD DATA INFILE 'file_name.csv'
IGNORE /*with this it checks based on the unique index on email, if the record already exists*/
INTO TABLE tbl_name /*adjust your table name*/
FIELDS TERMINATED BY ',' /*adjust the following to your CSV file*/
OPTIONALLY ENCLOSED BY '"'
(email_column, another_column) /*name the columns of your table*/
;

您可以阅读有关此命令here的更多信息。

在PHP中从CSV上载插入数据库之前检查重复

1 个答案: