What potential issues can arise when emptying and refilling a table in PHP with MySQL?

One potential issue that can arise when emptying and refilling a table in PHP with MySQL is the loss of data if the process is not handled correctly. To solve this issue, you can first back up the data in the table before emptying it, and then refill the table with the backed up data after the operation is complete. 

// Backup data in the table before emptying it
$backupQuery = "CREATE TABLE backup_table SELECT * FROM original_table";
$backupResult = mysqli_query($conn, $backupQuery);

if($backupResult) {
    // Empty the original table
    $emptyQuery = "TRUNCATE TABLE original_table";
    $emptyResult = mysqli_query($conn, $emptyQuery);

    if($emptyResult) {
        // Refill the original table with backed up data
        $refillQuery = "INSERT INTO original_table SELECT * FROM backup_table";
        $refillResult = mysqli_query($conn, $refillQuery);

        if($refillResult) {
            echo "Table emptied and refilled successfully.";
        } else {
            echo "Error refilling table: " . mysqli_error($conn);
        }
    } else {
        echo "Error emptying table: " . mysqli_error($conn);
    }
} else {
    echo "Error backing up data: " . mysqli_error($conn);
}

Keywords

MySQL truncate PHP data loss foreign key constraints

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