#114 Cppdb: Bound double constant becomes string of integer

[CN Liou]

Double constant 1000000. passed to PostgreSQL reaches PostgreSQL as string '1000000':

const double E6=1000000.f;
cppdb::result r=db_session << "SELECT amount/? FROM mytable" << E6;

PostgreSQL log:

Parameter:$1 = '1000000'

As a result, when amount is small, the selected result always becomes 0 rather than decimal like 0.01.