daxFetch(
const cursor, // db cursor handle
var& vals[], // target array for one row
[const nullind]) // null indicators (default = false)
Fetch next row from cursor. Returns true if row was fetched, otherwise
false (no more data available).
If argument nullind is passed as true, each fetched value is made
out of 2 variables, where the first is the value itself and the second is
a boolean indicating null values by true state. The size of vals
must therefore always be even.
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