Command code in IMS DB/DC

KAMALAK · New User Joined: 18 Jul 2005 Posts: 14

pleasse send some material on command code

swathig · New User Joined: 20 Sep 2005 Posts: 3

There are some command codes like F, N, C, V, U, P, D, Q etc
For finding various ways of retrieval in IMS.

sanon · New User Joined: 09 Dec 2005 Posts: 5

Some frequently used command codes are :

D - Put this segment into the IO?AREA (path call)
N - Do not replace this segment
C - Concatenated key in this SSA
F - Locate first occurrence
L - Locate last occurrence
P - Establish parentage at this level
U - Maintain current position at this level
V - Maintain current position here & higher
- - Null Command code.

prasanth_thavva

can you explain the above command codes ,, if any program please give an idea

Bitneuker · Posted: Mon Dec 19, 2005 7:10 pm Post subject:

From the manual:
C
Use the concatenated key of a segment to identify the segment

D
Retrieve or insert a sequence of segments in a hierarchic path using only one call, instead of having to use a separate call for each segment (path call).

F
Back up to the first occurrence of a segment under its parent when searching for a particular segment occurrence. Disregarded for a root segment.

L
Retrieve the last occurrence of a segment under its parent

M
Move a subset pointer to the next segment occurrence after your current position. (Used with DEDBs only.)

N
Designate segments that you do not want replaced when replacing segments after a Get Hold call. Usually used when replacing a path of segments.

P
Set parentage at a higher level than what it usually is (the lowest SSA level of the call).

Q
Reserve a segment so that other programs will not be able to update it until you have finished processing and updating it.

R
Retrieve the first segment occurrence in a subset. (Used with DEDBs only.)

S
Unconditionally set a subset pointer to the current position. (Used with DEDBs only.)

U
Limit the search for a segment to the dependents of the segment occurrence on which position is established.

V
Use the current position at this hierarchic level and above as qualification for the segment.

W
Set a subset pointer to your current position, if the subset pointer is not already set. (Used with DEDBs only.)

Z
Set a subset pointer to zero, so it can be reused. (Used with DEDBs only.)

-
Null. Use an SSA in command code format without specifying the command code. Can be replaced during execution with the command code or codes that you want.