Memorex LOCK - VERSION 2-24 Informações Técnicas descarregar pdf (Página 209)

100

101

TSIDAC2 Subroutine

User Reference

Use Pursuant to Company Instructions

5-7

Sequential and

Random

Access

When using random access, TSIDAC2 returns the master record for a

specific dataset the first time TSIDAC2 is called for that dataset. On each

subsequent call, TSIDAC2 returns a detail record for that dataset.

When using sequential access, TSIDAC2 returns each record in order for

a single dataset. TSIDAC2 then moves to the next dataset in the DSN

Catalog index and begins returning the index records, one record at a

time. Detail records are always returned current version first, followed by

each successively older version.

Also, when using sequential access, TSIDAC2 reads the EDD (Master)

record. Once the EDD record has been returned, subsequent TSIDAC2

calls return a Detail/Version record “belonging” to that EDD until all

Detail records have been retrieved. Subsequent calls to TSIDAC2 will

return the next Master record. Detail records are always returned current

version first, followed by successively older versions.

It is your responsibility to determine the status of a Detail record (active,

open, conditionally cataloged, scratched). TSIDAC2.C and TSIDAC2.A

copybooks provide the mappings to assist you when determining the

status of the record.

Procedure Use the following procedure when invoking the TSIDAC2 subroutine

from a calling program. It may be useful to have the TSIDAC2.C member

available as a guide.

Step Action Description

1 Define the storage area

required for the parameter list

that occurs during a TSIDAC2

call.

This storage area begins with a

one-byte field that is used as a

return code from TSIDAC2.

The rest of the storage area

contains the data being passed

to and received from

TSIDAC2.

The TSIDAC2.C copybook and

the TSIDAC2.A copybook

contain the layout of this

storage area. Both copybooks

are in the BIM-EPIC

installation library. Use one of

these copybooks to define the

storage area.

2 Place the appropriate argument

in the USR-KEY field to

instruct TSIDAC2 which

function to perform.

See “Search Arguments and

Calls” in this chapter for

additional information.

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