[sqlite] SQLite3_Exec vs SQLite3_prepare

[Bogusław Brandys]

In sqlite 3.3.4 SQLite3_Exec return proper error for example 19 when 
column should be unique, but SQLite3_Prepare always return error code 1
I'm using sqlite3_prepare before sqlite3_Step to execute some SQL and I 
think it should return the same error code as sqlite3_exec.
Any reasons why it is happen ?

Regards
Boguslaw