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WSupported on Windows
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USupported on Unix
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VSupported on OpenVMS
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NSupported in Synergy .NET
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xcall DD_RELATION(dcs, DDR_LIST, names_req, array, [start][, #names])
or
xcall DD_RELATION(dcs, DDR_INFO, name, from_key, to_struct, to_key)
Arguments
dcs
The repository control structure.
DDR_LIST
Returns the current structure’s relation names.
names_req
The number of relation names requested. (d2)
array
Returned with the array of relation names. ((*)a30)
start
(optional) Contains the relation name at which to start. (a30)
#names
(optional) Returned with the number of relation names. (d2)
DDR_INFO
Returns general relation information.
name
The unique relation name. (a30)
from_key
Returned with the name of the relation’s “from” key. (a30)
to_struct
Returned with the name of the relation’s “to” structure. (a30)
to_key
Returned with the name of the relation’s “to” key. (a30)
Discussion
The DD_RELATION subroutine returns information about relations for the current structure. There are two ways to call DD_RELATION:
- DDR_LIST enables you to retrieve the structure’s relation names.
- DDR_INFO enables you to retrieve general information about a relation.
You must have previously set the current structure with the DD_STRUCT subroutine. The same DD_STRUCT call should also have told you the number of relations that exist.
DDR_LIST
If you pass DDR_LIST, the DD_RELATION subroutine returns an array of relation names for the current structure. The names are returned in alphabetical order, starting with either the first name found or the specified name. DD_RELATION returns as many relation names as are found or as are requested, whichever is smaller. The actual number of names in the array can be returned in #names.
You must ensure that the buffer passed is large enough to hold the number of names you are requesting.
DDR_INFO
If you pass DDR_INFO, this subroutine reads the specified relation. If that relation is not found, the relevant error code is returned in the control structure. If it is found, general relation information is returned.
