On 15 Sep 2014, at 12:19pm, Dominique Devienne <ddevie...@gmail.com> wrote:
> On Mon, Sep 15, 2014 at 12:29 PM, Dan Kennedy <danielk1...@gmail.com> wrote: > >> On 09/15/2014 03:18 PM, Dominique Devienne wrote: >> >>> whenever >>> you >>> want to update a single byte of a blob, you must rewrite the whole row, >>> i.e. the whole blob(s) in that row (and I think this applies to any column >>> of the row, not only blob columns). This is just prohibitive, and >>> unmanageable in practice. >> >> I think the only exception to this is if you use the incremental-blob API: >> >> http://www.sqlite.org/c3ref/blob_open.html > > What do you mean Dan? Are you saying that opening an existing blob, writing > 1 byte somewhere, and closing it, does not yield the whole row to be > updated? Correct. That's what the incremental-blob API does. It just rewrites bytes wherever the existing row is on disk, updates indexes and performs TRIGGERS where appropriate. It does not rewrite the whole row record, and you can't use it to change the length of the BLOB. Simon. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
