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The segment modes based on absolute field number, also known as schema fields, are the preferred modes for segment definition. The preferred segment modes are defined in the SEG_MODE enum:
You may OR in the mode SEG_MODE.DESCENDING_SEG to the segment mode to specify the descending sort order for a segment. You can also OR in the segment mode SEG_MODE.ALTSEG_SEG to specify an alternate collating sequence for the segment.
The use of the preferred segment modes makes the FairCom DB API .NET table fully compatible with ISAM/Low Level applications and/or FairCom DB SQL applications.
Value |
Explanation |
|---|---|
SCHSEG_SEG |
Absolute field number |
USCHSEG_SEG |
Absolute field number - uppercase |
VSCHSEG_SEG |
Absolute field number - pad strings |
UVSCHSEG_SEG |
Absolute field number - pad strings upper |
SCHSRL_SEG |
Absolute field number - auto increment |
DESCENDING_SEG |
Descending segment mode |
ALTSEG_SEG |
Alternative collating sequence |
ENDSEG_SEG |
END segment mode |
The other segment modes are kept for compatibility with existing FairCom DB applications. Advanced FairCom DB API .NET functions like CTTable.Alter() may not work properly if the segment mode is not one of the preferred segment modes.
Value |
Explanation |
|---|---|
REGSEG_SEG |
Absolute byte offset - No transformation |
INTSEG_SEG |
Absolute byte offset - unsigned int/long |
UREGSEG_SEG |
Absolute byte offset - uppercase |
SRLSEG_SEG |
Absolute byte offset - auto increment |
VARSEG_SEG |
Relative field number |
UVARSEG_SEG |
Relative field number - uppercase |
SGNSEG_SEG |
Absolute byte offset - signed int/long |
FLTSEG_SEG |
Absolute byte offset - float/double |
DECSEG_SEG |
Absolute byte offset - not yet implemented |
BCDSEG_SEG |
Absolute byte offset - not yet implemented |
DESCENDING_SEG |
Descending segment mode |
ALTSEG_SEG |
Alternative collating sequence |
