`mysqli` Prepared Statements: `bind_result()` or `get_result()`?

Bind_result vs. Get_result: Which to Use?

Introduction

When working with prepared statements in mysqli, you have two options for fetching the result: bind_result() and get_result(). Understanding the differences between these methods is crucial for optimizing your database operations.

Bind_result()

bind_result() binds specific variables to the columns in the query result, allowing you to assign them directly to scalar variables. It's commonly used when you need specific columns from a query.

Example:

$query = 'SELECT id, first_name, last_name FROM table WHERE id = ?';
$id = 5;

$stmt = $mysqli->prepare($query);
$stmt->bind_param('i', $id);
$stmt->execute();
$stmt->store_result();
$stmt->bind_result($id, $first_name, $last_name);

Pros:

• Works with outdated PHP versions.
• Returns separate variables for each column.

Cons:

• Requires you to manually list all variables to bind.
• Requires additional code to return the row as an array.
• Must be updated when the table structure changes.

Get_result()

get_result() retrieves the entire result as an associative or enumerated array, automatically filled with data from the returned row. It's handy when you need to work with the entire row as an array.

Example:

$query = 'SELECT * FROM table WHERE id = ?';
$id = 5;

$stmt = $mysqli->prepare($query);
$stmt->bind_param('i', $id);
$stmt->execute();
$result = $stmt->get_result();

Pros:

• Returns an associative/enumerated array or object automatically.
• Supports fetch_all() for retrieving all returned rows at once.

Cons:

• Requires the MySQL native driver (mysqlnd).

Limitations and Differences

Both methods have limitations:

• bind_result() requires explicit column listing, making it error-prone and inflexible.
• get_result() doesn't support outdated PHP versions and requires the MySQL native driver.

Choosing the Right Method

The best method depends on your specific requirements:

• If you need separate variables for specific columns and work with older PHP versions, use bind_result().
• If you prefer working with the row as an array, want to retrieve all rows at once, and have a MySQL native driver, use get_result().

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