Function Command.bindParameter
Bind a D variable to a prepared statement parameter.
In this implementation, binding comprises setting a value into the appropriate element of an array of Variants which represent the parameters, and setting any required specializations.
To bind to some D variable, we set the corrsponding variant with its address, so there is no need to rebind between calls to execPreparedXXX.
Prototype
void bindParameter(T)(
ref T val,
size_t pIndex,
ParameterSpecialization psn = PSN(0, SQLType
);