On Feb 8, 2005, at 9:05 AM, Levente Lajko wrote:
I have problem with a table from where I select specific field data
SELECT filed1, field2 FROM tbl WHERE progress = 1 LIMIT 1
through a perl script or multiple instances of that script. The script sets the progress value of the progressed record to 0, so that other processes not to access that row. I presume I would need some locking solution, only I haven’t found the real one.
I hope somebody has a bright idea.
Maybe you are looking for SELECT FOR UPDATE as in
SELECT filed1, field2 FROM tbl WHERE progress = 1 LIMIT 1 FOR UPDATE;
This locks the row for the remainder of the transaction. See
http://www.postgresql.org/docs/8.0/interactive/sql-select.html#SQL-FOR- UPDATE
John DeSoi, Ph.D. http://pgedit.com/ Power Tools for PostgreSQL
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