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On 29/02/12 09:22, Pete wrote:
> The problem I have is that the error messages that come back from 
> constraint violations are extremely generic (e.g. "constraint failed")
> and would mean nothing to a user.

An issue first reported in 2006:

  http://www.sqlite.org/src/tktview?name=23b2128201

I think (but have not tried) that you can make a user defined function and
have that do the checks.  It can then either directly error, or put a
message in a buffer somewhere that you can retrieve on constraint failure.

Roger
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