How to Retrieve Multiple Result Sets from Stored Procedures in MySQL with PHP/mysqli and PDO?

Handling Multiple Result Sets from Stored Procedures in MySQL Using PHP/mysqli

Retrieving multiple result sets from stored procedures in PHP/mysqli can be achieved by employing the mysqli_stmt_next_result() function. The following example demonstrates how to use this function to advance to the second result set:

<code class="php">$stmt = mysqli_prepare($db, 'CALL multiples(?, ?)');
mysqli_stmt_bind_param($stmt, 'ii', $param1, $param2);
mysqli_stmt_execute($stmt);

// Fetch and process the first result set
$result1 = mysqli_stmt_get_result($stmt);
while ($row1 = mysqli_fetch_assoc($result1)) {
    // Process row1
}

// Advance to the second result set
mysqli_stmt_next_result($stmt);
if (mysqli_stmt_error($stmt)) {
    die('Failed to advance to the second result set: ' . mysqli_stmt_error($stmt));
}

// Fetch and process the second result set
$result2 = mysqli_stmt_get_result($stmt);
while ($row2 = mysqli_fetch_assoc($result2)) {
    // Process row2
}</code>

PDO Solution

Using PDO, the code would appear as follows:

<code class="php">$stmt = $db->prepare('CALL multiples(:param1, :param2)');
$stmt->execute([':param1' => $param1, ':param2' => $param2]);

// Fetch and process the first result set
while ($row1 = $stmt->fetch()) {
    // Process row1
}

// Advance to the second result set
$stmt->nextRowset();

// Fetch and process the second result set
while ($row2 = $stmt->fetch()) {
    // Process row2
}</code>

Note:

It is important to remember that not all database servers support multiple result sets from stored procedures. Always refer to your database server's documentation for compatibility.

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