[odb-users] Setting index length

[Andreas Pasternak]

Hello all,

I created indexes for my tables using ODB. Now I get the following error:

what():  1170 (42000): BLOB/TEXT column 'd_frame_id' used in key 
specification without a key length

This means that I have to specify the length of the corresponding index.
I have the following code:

#pragma db index("mt::ps::TestData_idx")  \
member(d_.m_test_) /std::string*/ \
)

But where do I specify with this syntax length?

Thank you!
Andreas