E@DBFINDPRVRNG
Name
The E@DBFINDPRVRNG call has the following format:
DN@<Logical>(E@DBFINDPRVRNG)
where <Logical> identifies the database file and index to use to perform the E@DBFINDPRVRNG call.
Description
When you need to process a range of data without interruption, use E@DBFINDPRVRNG.
Using the API in a Program
You must precede E@DBFINDPRVRNG with E@DBFINDBEGRNG, E@DBFINDSUBRNG, E@DBFINDMIDRNG, or E@DBFINDMIDSUB.
Input Values
| Field | Description |
|---|---|
| <Logical> | <Logical> in the E@ statement identifies the database file and index to use to perform the call. |
| Record retrieval variables (also known as D@ and D# fields) | Define the beginning and ending values of the last key by moving the appropriate values to the record retrieval fields named D@<KeyFieldName> and D#END#<KeyFieldName>. |
| E@DBBEGRNG | Move a number into E@DBBEGRNG in order to tell the interface which key is the last significant one defining the range. This number is equivalent to the position of the field in the index. |
Return Values
| Field | Description |
|---|---|
| D<prefix>@NOTFOUND |
Each routine sets the logical value <FileName>-NOTFOUND or <FileName>-FOUND based on the outcome of the read process. The Find routines set D<prefix>@NOTFOUND to FALSE if a record is found, TRUE if a record is not found, or E@KEY@FOUND if the keys are found. |