How to Efficiently Get the Row Count from a PHP PDO SELECT Query?

PHP PDO: Determining Row Count in Select Queries

PDO, the PHP Data Objects extension, provides a robust interface for database interaction. However, it lacks a direct method for retrieving the number of rows returned by a SELECT query. This raises the question of how to efficiently determine the row count.

Alternative Approach: PDOStatement-> rowCount()

Despite its name, PDOStatement->rowCount() is not suitable for obtaining the row count in SELECT queries. According to the PDO documentation, it should not be used for this purpose.

Recommended Solution: PDO::query() and PDOStatement->fetchColumn()

The recommended method to retrieve row count is to use a SELECT COUNT(*) statement with the same conditions as the intended SELECT query. Use PDO::query() to issue the statement and then use PDOStatement->fetchColumn() to extract the count.

Determining Row Count in Existing Recordset

If you already have an active recordset, you can use one of the fetch* methods (e.g., fetchAll()) to retrieve the data and then use count to determine the row count. However, this approach is slightly less efficient than the aforementioned method because it requires fetching all the data.

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