The mi_scan_nprojs() accessor function
The mi_scan_nprojs() function returns a value that is 1 less than the number of columns in a query projection.
Syntax
mi_integer mi_scan_nprojs(MI_AM_SCAN_DESC *scanDesc)- scanDesc
- Points to the scan descriptor.
Usage
Use the return value from this function to determine the number of times to loop through the related mi_scan_projs() function.
The mi_scan_nprojs() function
returns 2 to indicate that the following SELECT statement
projects three columns:
SELECT column1, column2, column3 FROM tableReturn values
The integer return value indicates the number of columns that the Projection clause of a query specifies.