PHP / MySQL-PDO库获取总行数

Question

How would I go about getting the total number of rows in a table using the PDO library?

Below is how I execute my queries.

$query = " 

"; 

try 
{ 

    $stmt = $db->prepare($query); 
    $stmt->execute(); 
} 
catch(PDOException $ex) 
{ 

    die("Failed to run query: " . $ex->getMessage()); 
}

EDIT

I should have made it more clear, I'm sorry, but I was looking for the PDO way of getting number of rows...

Answer 1

A database does not have rows. A table, however, does. What I think that you are looking for, is a SQL query that will count the rows in a table. Which you can do like this:

SELECT COUNT(*) AS count FROM table

If you execute that query, the count field in the result will contain the number of rows in the table.

Answer 2

Take a look at rowcount in PDO.

1) Useful for delete, update or insert queries

2) See the answer of kokx for select queries