OCI-Lob->erase

(PHP 5, PECL OCI8 >= 1.1.0)

OCI-Lob->erase — Erases a specified portion of the internal LOB data

int OCI-Lob::erase ([ int $offset [, int $length ]] )

Erases a specified portion of the internal LOB data starting at a specified offset. If called without parameters, it erases all LOB data.

For BLOBs, erasing means that the existing LOB value is overwritten with zero-bytes. For CLOBs, the existing LOB value is overwritten with spaces.

Returns the actual number of characters/bytes erased 或者在失败时返回 FALSE.