使用oci_num_rows在OCI / PHP中出现问题

Question

当通过SQL的完全相同的查询返回228时，为什么下面会显示0 results returned ？

error_reporting(E_ALL);
ini_set('display_errors', 1);

include("connection.php");

if($conn){

  $stid = oci_parse($conn, "SELECT COUNT(CustomerNo) FROM Customers");
  oci_execute($stid);

  echo oci_num_rows($stid) . " rows returned.<br />\n";

  oci_free_statement($stid);
  oci_close($conn);
}

Answer 1

您必须获取结果，然后调用oci_num_rows。 正如oci_num-rows的PHP手册中所述 -

Note: This function does not return number of rows selected! For SELECT statements this function will return the number of rows, that were fetched to the buffer with oci_fetch*() functions.

因此，您的PHP代码应该像：

error_reporting(E_ALL);
ini_set('display_errors', 1);

include("connection.php");

if($conn){

  $stid = oci_parse($conn, "SELECT COUNT(CustomerNo) FROM Customers");
  oci_execute($stid);

  $numrows = oci_fetch_all($stid, $res);
  echo $numrows . " rows returned.<br />\n";

  oci_free_statement($stid);
  oci_close($conn);
}