[DB open] will not prompt an error

[zxkc]

use fmdb/sqlcipher to open a database with password, if the password is not set, [DB open] will not prompt an error

[R4N]

Open/key will not immediately throw an error if the key is incorrect. You'll need to perform some operation on the database to test the key -- typically SELECT COUNT(*) FROM sqlite_master;

See this reference from the SQLCipher documentation: https://www.zetetic.net/sqlcipher/sqlcipher-api/#testing-the-key