Re: [Mysqlcppapi-main] How to convert decimal to double and mediatext to string?

[Jonathan W. <my...@ka...>]

2011/2/11 韩彦军（Hammer):
> Hi all, in the example ssqls1.cpp I want to convert the sql_decimal type
> to the ordinary c++ double via the following statements:
>
> double d;
> d = it->price;
>
> but I got errors when compiling as follows:
>
> lib/null.h: In member function ‘mysqlpp::Null<Type, Behavior>::operator
> Type() const [with Type = double, Behavior = mysqlpp::NullIsNull]’:
> examples/ssqls1.cpp:72:13: instantiated from here
> lib/null.h:55:2: error: ‘mysqlpp::null_type::operator
> CannotConvertNullToAnyOtherDataType() const [with
> CannotConvertNullToAnyOtherDataType = double]’ is protected
> lib/null.h:232:29: error: within this context
> make: *** [ssqls1_ssqls1.o] Error 1
>
> Besides, when I convert sql_mediatext type to the c++ string via:
>
> string s;
> s = it->description;
>
> I got a similar error:
>
> lib/null.h: In member function ‘mysqlpp::Null<Type, Behavior>::operator
> Type() const [with Type = std::basic_string<char>, Behavior =
> mysqlpp::NullIsNull]’:
> examples/ssqls1.cpp:72:13: instantiated from here
> lib/null.h:55:2: error: ‘mysqlpp::null_type::operator
> CannotConvertNullToAnyOtherDataType() const [with
> CannotConvertNullToAnyOtherDataType = std::basic_string<char>]’ is protected
> lib/null.h:232:29: error: within this context
> make: *** [ssqls1_ssqls1.o] Error 1
>
> I searched the archive and didn't find any solution. Any suggestion?
> Thank you very much!

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