Function SQLGetConnectAttrW 

pub unsafe extern "system" fn SQLGetConnectAttrW(
    connection_handle: HDbc,
    attribute: ConnectionAttribute,
    value_ptr: Pointer,
    buffer_length: Integer,
    string_length_ptr: *mut Integer,
) -> SqlReturn

Returns the current setting of a connection attribute.

• buffer_length: is either buffer length or one of crate::IS_POINTER, crate::IS_UINTEGER, crate::IS_INTEGER, crate::IS_USMALLINT or crate::IS_SMALLINT.

Returns

SUCCESS, ERROR, SQL_NO_DATA, or INVALID_HANDLE.