Once again I'm at a loss.
I tried this:
dbsession.execute("LOCK TABLES tokens WRITE")
dbsession.execute(cond_insert) # As per above discussion.
dbsession.execute("UNLOCK TABLES")
which raises an error: 1100, "Table 'tokens' was not locked with LOCK
TABLES".
Then I read that the temporary table created by an inner select needs to be
locked as well, but it doesn't exist at the time when LOCK TABLES executes.
So using stmt.alias("foo") for the INSERT, and adding "foo" to the LOCK
TABLES doesn't work. The "dual" table can't be locked either, as it doesn't
actually exist. No other table is being used by the conditional INSERT as
far as I can see.
I can't quite make sense of the error message, and how to resolve it.
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