PHP / PSQL / SQL资源是否总是在成功查询后返回？

Question

I am writing some business critical queries and am relying on is_resource to filter all failed queries (ie, bad syntax etc.)

Take this query for example:

$result = pg_query('SELECT * FROM logs');

if (!is_resource($result)) {
    die('Error');
}

Will that also die('Error') if the query works but no rows are returned? I need it to return a resource even if no rows have been returned from the database.

Answer 1

There will be a resource if there is no error. To check rows, you want to use pg_num_rows .

Answer 2

Quote from php.net: "If an error occurs, and FALSE is returned, details of the error can be retrieved using the pg_last_error() function if the connection is valid." "A query result resource on success or FALSE on failure."

That sounds like there will always be a resource as result as long as there was no error.