What are the considerations when deciding between deleting and re-importing data from a .csv file into a MySQL database using PHP?

When deciding between deleting and re-importing data from a .csv file into a MySQL database using PHP, consider the size of the dataset, the frequency of updates, and the potential impact on existing data. If the dataset is small and updates are infrequent, deleting and re-importing may be a simple solution. However, if the dataset is large or updates are frequent, it may be more efficient to update existing records and insert new ones without deleting the entire dataset. 

// Sample PHP code for re-importing data from a .csv file into a MySQL database

// Connect to MySQL database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";
$conn = new mysqli($servername, $username, $password, $dbname);

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

// Read data from .csv file
$csvFile = 'data.csv';
$csvData = file_get_contents($csvFile);
$rows = array_map('str_getcsv', explode("\n", $csvData));

// Truncate existing table data
$conn->query("TRUNCATE TABLE table_name");

// Insert new data into MySQL table
foreach ($rows as $row) {
    $sql = "INSERT INTO table_name (column1, column2, column3) VALUES ('" . $row[0] . "', '" . $row[1] . "', '" . $row[2] . "')";
    $conn->query($sql);
}

// Close MySQL connection
$conn->close();

Keywords

CSV file MySQL database data deletion data re-import PHP script

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