How to Fetch a Single Cell Value Using PDO?

Retrieving a Single Cell Value with PDO

When working with relational databases, it's common to retrieve specific data from selected columns within a row. In this case, the objective is to retrieve a single cell value from a MySQL table.

To execute this task, PHP's PDO (PHP Data Objects) extension provides a convenient method. Assuming you have the query:

SELECT some_col_name FROM table_name WHERE user=:user

where you need to extract the value in the some_col_name column, the following code can be used:

<code class="php">$stmt = $dbh->prepare("SELECT some_col_name FROM table_name WHERE user=:user");
$stmt->bindParam(':user', $user);
$stmt->execute();

$col_value = $stmt->fetchColumn();</code>

Here, $col_value will directly contain the value of the column for the row matching the user parameter.

It's worth noting that before executing the query, you must bind the :user parameter with the actual user value. If your query returns no rows (e.g., no matching user found), the fetchColumn() method will return false.

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