Harald,
Thursday, August 15, 2002, 4:02:44 PM, you wrote:
HF> I think I've found a bug in the handling of large INSERTs/UPDATEs
HF> (MySQL 4.0.2, Intel/Linux).
HF> Consider the following:
HF> CREATE TABLE IF NOT EXISTS tbl1 (
HF> id INT UNSIGNED NOT NULL AUTO_INCREMENT,
HF> txt LONGTEXT NOT NULL,
HF> PRIMARY KEY (id)
HF> ) TYPE=Innodb;
HF> INSERT INTO tbl1 (txt) VALUES (LOAD_FILE("/var/tmp/out"));
[skip]
HF> If I do
HF> UPDATE tbl1
HF> SET txt = CONCAT(txt, LOAD_FILE("/var/tmp/out"))
HF> WHERE id = 1;
HF> (i.e. duplicating txt), SELECT returns
HF> +----+-----+
HF> | id | len |
HF> +----+-----+
HF> | 1 | 0 |
HF> +----+-----+
HF> According to the manual, LOAD_FILE returns NULL if the file is too
HF> large, but apparently this isn't the case here.
In your case total text length is bigger than max_allowed_packet, that
is why you've got len=0
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