使用PHP PDO从CSV从mysql插入数据

Question

I have list of data in CSV and need to insert this data into a MySQL database. These data should be safely inserted ie sanitation. So, I have used PDO object to rectify SQL injection. But, it fails to get data from CSV file and inserts null values.

Here is the example,

<?php
$servername = "localhost";
$username   = "root";
$password   = "";

try {
    $conn = new PDO("mysql:host=$servername;dbname=contact_list",$username,$password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    echo "connection successfully";
}
catch(PDOException $e)
{
    echo "connection Failed:" . $e -> getMessage();
}

// Create  CSV to Array function
function csvToArray($filename = '', $delimiter = ',')
{
    if (!file_exists($filename) || !is_readable($filename)) {
        return false;
    }

    $header = NULL;
    $result = array();
    if (($handle = fopen($filename, 'r')) !== FALSE) {
        while (($row = fgetcsv($handle, 1000, $delimiter)) !== FALSE) {
            if (!$header)
                $header = $row;
            else
                $result[] = array_combine($header, $row);

        }
        fclose($handle);
    }

    return $result;
}

// Insert data into database   

$all_data = csvToArray('contact.csv');
foreach ($all_data as $data) {

    $data = array_map(function($row){
        return filter_var($row, FILTER_SANITIZE_STRING, FILTER_SANITIZE_FULL_SPECIAL_CHARS);
        }, $data);

    $sql = $conn->prepare("INSERT INTO contact 
                (title, first_name,last_name,company_name,date_of_birth,notes) 
        VALUES (:t, :fname, :lname,:cname,:dob,:note)");

    $sql->bindParam(':t', $data[1], PDO::PARAM_STR);
    $sql->bindParam(':fname', $data[2], PDO::PARAM_STR);
    $sql->bindParam(':lname', $data[3], PDO::PARAM_STR);
    $sql->bindParam(':cname', $data[0], PDO::PARAM_STR);
    $sql->bindParam(':dob', $data[4], PDO::PARAM_STR);
    $sql->bindParam(':note', $data[15], PDO::PARAM_STR);
    print_r($data);
    $sql->execute();    
}
?>

Can anyone help me to solve this?

Answer 1

If you take a look at the documentation for array_combine() you'll see that its purpose is to build an associative array. You use this function in csvToArray() but later in your code you are trying to get data using numeric keys. I wouldn't expect you'd ever have anything inserted.

On a side note, you are completely defeating the purpose of prepared statements by repeatedly preparing the same statement over and over again. Prepare once and execute many times. Individually binding parameters is rarely needed, in almost all cases you can provide the data to PDOStatement::execute() as an array. It's also bad form to store HTML entities in a database; if you need to output to HTML, you perform escaping at that point.

Something like this should work (adjust array key names as necessary.)

$all_data = csvToArray('contact.csv');
$sql = $conn->prepare("INSERT INTO contact 
    (title, first_name, last_name, company_name, date_of_birth, notes) 
    VALUES (:t, :fname, :lname,:cname,:dob,:note)");
foreach ($all_data as $data) {
    $params = [
        ":t"     => $data["t"],
        ":fname" => $data["fname"],
        ":lname" => $data["lname"],
        ":dob"   => $data["dob"],
        ":note"  => $data["note"],
    ];
    $sql->execute($params);
}