How do I retrieve multiple result sets from a stored procedure using MySQLi in PHP?

Retrieving Multiple Result Sets from a Stored Procedure with MySQLi

Your stored procedure, "multiples," generates multiple result sets. To advance to and retrieve data from subsequent result sets, follow these steps using the MySQLi extension:

PHP Procedural Style:

<code class="php">// Prepare the statement
$stmt = mysqli_prepare($db, 'CALL multiples(?, ?)');

// Bind parameters
mysqli_stmt_bind_param($stmt, 'ii', $param1, $param2);

// Execute the statement
mysqli_stmt_execute($stmt);

// Fetch the first result set
$result1 = mysqli_stmt_get_result($stmt);
while ($row1 = $result1->fetch_assoc()) {
  echo "Result 1: " . $row1['id'] . "\n";
}

// Advance to the second result set
mysqli_stmt_next_result($stmt);
$result2 = mysqli_stmt_get_result($stmt);

// Fetch and print the second result set
while ($row2 = $result2->fetch_assoc()) {
  echo "Result 2: " . $row2['id'] . "\n";
}

// Close the statement
mysqli_stmt_close($stmt);</code>

PHP Object-Oriented Style:

<code class="php">// Create a prepared statement object
$stmt = $db->prepare('CALL multiples(?, ?)');

// Bind parameters
$stmt->bind_param('ii', $param1, $param2);

// Execute the statement
$stmt->execute();

// Fetch the first result set
$result1 = $stmt->get_result();
while ($row1 = $result1->fetch_assoc()) {
  echo "Result 1: " . $row1['id'] . "\n";
}

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

// Store and print results from the second result set
$result2 = $stmt->get_result();
while ($row2 = $result2->fetch_assoc()) {
  echo "Result 2: " . $row2['id'] . "\n";
}

// Close the statement
$stmt->close();</code>

Additional Notes:

• After advancing to the next result set, you must fetch and process it before moving on to the subsequent one.
• If your stored procedure generates ints that are returned as empty strings, check the column types in your database table.
• Consider using object-oriented style with MySQLi for a cleaner and more encapsulated code structure.

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