add is_write_type method for merge query

[ytetsuro]

I would like to get affected_rows when I run the following code:

<?php
$sql = <<<EOD
MERGE INTO DUAL A
USING DUAL B ON (A.ID = B.ID)
WHEN MATCHED THEN
    UPDATE SET A.FOO = B.BAR
WHEN NOT MATCHED THEN
    INSERT (ID, FOO) VALUES (B.ID, B.BAR)
EOD;

$this->db->query($sql);
var_dump($this->db->affected_rows());

[narfbg]

Why are you overriding the method for OCI8 instead of just adding MERGE to the original one?

[ytetsuro]

I thought MERGE was the only function of Oracel.
But that is wrong. It function MERGE also in SQL Server.
Thank you for your reply.

We rebased to change the modification part.

[ytetsuro]

merged thanks!