(PHP 4, PHP 5, PHP 7, PHP 8)
odbc_num_rows — Number of rows in a result
$statement): int
Gets the number of rows in a result. For INSERT, UPDATE and DELETE
statements odbc_num_rows() returns the number of rows
affected. For a SELECT clause this can be the number
of rows available.
Returns the number of rows in an ODBC result. This function will return -1 on error.
注意:
Using odbc_num_rows() to determine the number of rows available after a SELECT will return -1 with many drivers.