On Mon, 04 Apr 2016 17:51:30 +0200 Domingo Alvarez Duarte wrote:

>FOREIGN KEY constraint failed  

>I have some databases with lots of foreign keys and I sometimes I need to
>change the structure of some tables and I get this message

Before restructuring a database schema always use:

PRAGMA foreign_keys = OFF;

After restructuring is executed successfully you can test the result by 
querying with this pragma ON.
http://sqlite.org/pragma.html#pragma_foreign_keys

Kind regards/Vriendelijke groeten.
Klaas `Z4us` Van B., CEO/CIO LI#437429414

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