PHP set_local_infile_handler() function (with example)

Hey everyone,

I have been working with PHP and MySQL lately and came across a function called set_local_infile_handler(). I am not quite sure how to use it properly and would appreciate some guidance.

To give you some context, I am currently developing a web application that involves importing large CSV files into a MySQL database. I understand that PHP provides the LOAD DATA INFILE statement to accomplish this, but I have read that set_local_infile_handler() can be used to customize the handling of local files before executing the LOAD DATA INFILE statement.

I would like to know how to use set_local_infile_handler() effectively in this scenario. Are there any specific steps or best practices that I should follow? It would be great if someone could provide an example code snippet demonstrating the usage of set_local_infile_handler().

Thanks in advance for your help!

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brakus.thaddeus

July 02 2023 at 04:45 PM

Hey there,

I actually had a similar requirement in one of my projects where I needed to import CSV files into a MySQL database using PHP. While I haven't specifically used set_local_infile_handler() myself, I can offer you an alternative solution that might be helpful.

In my case, instead of using set_local_infile_handler(), I utilized the LOAD DATA INFILE statement directly in PHP to handle the CSV import. Here's an example code snippet to demonstrate how I achieved it:

php
<?php

// Database connection settings

$servername = "localhost";

$username = "DB_USERNAME";

$password = "DB_PASSWORD";

$dbname = "DB_NAME";



// CSV file path

$csvFile = "path/to/your/csv/file.csv";



// Create a new mysqli instance

$conn = new mysqli($servername, $username, $password, $dbname);



// Check connection

if ($conn->connect_error) {

    die("Connection failed: " . $conn->connect_error);

}



// Import CSV using LOAD DATA INFILE

$sql = "LOAD DATA INFILE '$csvFile'

        INTO TABLE your_table

        FIELDS TERMINATED BY ','

        LINES TERMINATED BY '\n'

        IGNORE 1 ROWS";



if ($conn->query($sql) === true) {

    echo "CSV imported successfully";

} else {

    echo "Error importing CSV: " . $conn->error;

}



// Close the database connection

$conn->close();

?>

In this code snippet, you'll need to replace the `DB_USERNAME`, `DB_PASSWORD`, `DB_NAME`, `your_table`, and `path/to/your/csv/file.csv` with your actual database credentials and CSV file path.

By using the method above, you can directly import your CSV files into your MySQL database without the need for set_local_infile_handler().

I hope this approach works for you. However, if you still want to explore set_local_infile_handler() and get an example implementation using that function, I'm sure someone else in the community might be able to help you with that.

Good luck with your web application development!

Helpful (8)

gheidenreich

June 26 2023 at 10:22 AM

Hey everyone,

I stumbled upon this thread and thought I could share my experience with using `set_local_infile_handler()` in PHP for importing CSV files into a MySQL database.

In one of my recent projects, I had to handle large CSV imports efficiently. I opted to use `set_local_infile_handler()` to customize the file handling process before executing the `LOAD DATA INFILE` statement.

The `set_local_infile_handler()` function allows you to define your own callback function to handle open, read, and close operations on local files. This gives you more control over the importing process.

Here's a basic example of how you can use `set_local_infile_handler()`:

php
<?php

$connection = mysqli_connect("localhost", "username", "password", "database");



function handleLocalFile($fileName, &$buffer, &$errno, &$errmsg, &$wfpath) {

    $handle = fopen($fileName, 'r');

    if ($handle !== false) {

        while (($data = fgetcsv($handle)) !== false) {

            // Process each row from the CSV file

            $buffer[] = $data;

        }

        fclose($handle);

        return strlen($fileName);

    }

    return -1;

}



mysqli_set_local_infile_handler($connection, "handleLocalFile");



// After setting the handler, you can execute your LOAD DATA INFILE statement

$sql = "LOAD DATA LOCAL INFILE '/path/to/your/file.csv'

        INTO TABLE your_table

        FIELDS TERMINATED BY ','

        LINES TERMINATED BY '\n'

        IGNORE 1 ROWS";



if (mysqli_query($connection, $sql)) {

    echo "CSV imported successfully";

} else {

    echo "Error importing CSV: " . mysqli_error($connection);

}



mysqli_close($connection);

?>

In this example, the `handleLocalFile()` function is defined as the callback for `set_local_infile_handler()`. It uses `fopen()` and `fgetcsv()` to read the CSV file and process each row. You can customize this function according to your specific needs.

Once the handler is set, you can use the `LOAD DATA LOCAL INFILE` statement to import the CSV file into the MySQL table.

I hope this sheds some light on how to use `set_local_infile_handler()` for CSV imports. If you have any further questions, feel free to ask!

Good luck with your project!

Helpful (8)

PHP set_local_infile_handler() function (with example)

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