What are the potential pitfalls of using the "REPLACE INTO" statement in PHP when importing CSV files?

When using the "REPLACE INTO" statement in PHP to import CSV files, one potential pitfall is that it will completely replace existing data in the table with the new data from the CSV file. This can result in unintentional data loss if there are existing records that should not be overwritten. To avoid this issue, you can use the "INSERT INTO" statement with the "ON DUPLICATE KEY UPDATE" clause instead, which will insert new records and update existing ones based on a specified key. 

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

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

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

$sql = "LOAD DATA INFILE 'file.csv' INTO TABLE tablename FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n' IGNORE 1 LINES";

if ($conn->query($sql) === TRUE) {
    echo "CSV data imported successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();
?>

Keywords

REPLACE INTO PHP CSV files Importing Pitfalls

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