E@DBFINDFLTMID
Name
The E@DBFINDFLTMID call has the following format:
DN@<Logical>(E@DBFINDFLTMID)
where <Logical> identifies the database file and index to use to perform the E@DBFINDFLTMID call.
Description
When you need to process a filtered range of data, starting at a given point in the range, use E@DBFINDFLTMID.
Using the API in a Program
The database routines perform an equal condition on all D@ fields that have an assigned value—that is, all columns up to, and including, the field moved to E@DBBEGRNG.
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. |
| Filter value parameter | Set this parameter using a method described in Setting the Filter Parameter Value, and create the filter using the routine described in U@FLTCREATE. |
Return Values
| Field | Description |
|---|---|
| D<prefix>@NOTFOUND | 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. |
Programming Example
The following example uses E@DBFILTERBEGR and then E@DBFINDFLTMID to reposition.
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