Comparing command codes and options

The following table compares the options you use with EXEC DLI commands with the command codes you use with DL/I calls. For example, the LOCKED option performs the same function as a Q command code.

Table 1. Comparing call-level and command-level programs: command codes and options
Call- Level	Command-Level	Allows You to . . .
C	KEYS option	Use the concatenated key of a segment to identify the segment.
D	INTO or FROM specified on segment level to be retrieved or inserted.	Retrieve or insert a sequence of segments in a hierarchic path using only one request, instead of having to use a separate request for each segment. (Path call or command).
F	FIRST option	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	LAST option	Retrieve the last occurrence of a segment under its parent.
M	MOVENEXT option	Set a subset pointer to the segment following the current segment.
N	Leave out the SEGMENT option for segments you do not want replaced.	Designate segments you do not want replaced, when replacing segments after a get hold request. Usually used when replacing a path of segments.
P	SETPARENT	Set parentage at a higher level than what it usually is (the lowest hierarchic level of the request).
Q	LOCKCLASS, LOCKED	Reserve a segment so that other programs are not able to update it until you have finished processing it.
R	GETFIRST option	Retrieve the first segment in a subset.
S	SET option	Unconditionally set a subset pointer to the current segment.
U	No equivalent for command level programs.	Limit the search for a segment to the dependents of the segment occurrence on which position is established.
V	CURRENT option	Use the hierarchic level of and levels above the current position as qualifications for the segment.
W	SETCOND option	Conditionally set a subset pointer to the current segment.
Z	SETZERO option	Set a subset pointer to zero.
–	No command-level equivalent.	Null. Use an SSA in command code format without specifying the command code. Can be replaced during execution with the command codes you want.