Gets the double type value from the current record.
[in] Request handle received in DatabasePrepare().
[in] Field index in the request. Field numbering starts from zero and cannot exceed DatabaseColumnsCount() - 1.
[out] Reference to the variable for writing the field value.
Return true if successful, otherwise false. To get the error code, use GetLastError(), the possible responses are:
The value can be obtained only if at least one DatabaseRead() call has been preliminarily made for 'request'.
To read the value from the next record, call DatabaseRead() preliminarily.