On Dec 12, 2008, at 11:16 AM, Marco Bambini wrote: > I have two databases, db1 and db2. > At some point I attach db2 to db1 as 'destdb' then I do: > > sqlite3_exec(db1, "BEGIN", ...); > sqlite3_exec(db1, "INSERT INTO destdb.table1 SELECT * FROM > main.table1", ...); > sqlite3_exec(db1, "INSERT INTO destdb.table2 SELECT * FROM > main.table2", ...); > sqlite3_exec(db1, "COMMIT", ...); > > so, I am actually reading from db1 and writing to db2, but since the > two db are attached and the transaction is started in db1, I wonder if > locking on db1 is marked as RESERVED or EXCLUSIVE at some point. (I > just would like to know if db1 seems a db with write operations from > sqlite's point of view)... and should the transaction be started on > db2 or it doesn't matter when the two dbs are attached? >
Recompile with -DSQLITE_DEBUG=1. Then call "PRAGMA lock_status" prior to the COMMIT (or any other place when you want to know what the status of the locks is) and it will tell you. Or, from C, call sqlite3_file_control() with the SQLITE_FCNTL_LOCKSTATE option for each attached database and you will get back the lock status for that database. See the implementation of the "lock_status" pragma for an example. D. Richard Hipp d...@hwaci.com _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
