When I do a single row
INSERT to a table that has an
AUTO_INCREMENT column I'd like to use the
LAST_INSERT_ID() function to return the new
AUTO_INCREMENT'ed value stored for that row.
As many Microsoft SQL Server devs and admins no doubt are aware the equivalent functionality in SQL Server (
@@IDENTITY) hasn't been without its problems.
I know the MySQL docs state:
The ID that was generated is maintained in the server on a per-connection basis. This means that the value returned by the function to a given client is the first
AUTO_INCREMENTvalue generated for most recent statement affecting an
AUTO_INCREMENTcolumn by that client. This value cannot be affected by other clients, even if they generate
AUTO_INCREMENTvalues of their own. This behavior ensures that each client can retrieve its own ID without concern for the activity of other clients, and without the need for locks or transactions.
and even go so far as to say:
AUTO_INCREMENTcolumns simultaneously from multiple clients is perfectly valid.
Are there any known risks or scenarios that may cause
LAST_INSERT_ID() not to return the correct value?
I'm using MySQL 5.5 on CentOS 5.5 x64 and Fedora 16 x64 and the InnoDB engine.