ELEMENT_ID

[giorgiob]

I need to retrieve, through a CTRL script, the ELEMENT_ID of the ELEMENTS table in RDB archive.

dpGetId() retrieves dp_id and dpe_id, but how do I get sys_id and how do I combine them to calculate ELEMENT_ID?

Thanks.

[leoknipp]

The system ID is the system number. The system number you can get with the function getSystemId() if you know the system name.

Best Regards
Leopold Knipp
Senior Support Specialist

[giorgiob]

Ok, but how to calculate ELEMENT_ID? Maybe:

ELEMENT_ID = dp_id * 0x1000000 + dpe_id * 0x100 + sys_id

?

[giorgiob]

Is it correct?

[ngloeckner]

I think so. The formula seems right, because my results are correct.

[leoknipp]

The information from the source code to calculate the ELEMENT_ID is

PVSSlonglong SQLParser::makeElementIDNr(unsigned long dpId,
long dpeId,
SystemNumTypeRDB sysID)
{
/*
PVSSlonglong elemID = (((PVSSlonglong) dpId) << 24) +
(((PVSSlonglong) dpeId) << 8) +
(PVSSlonglong) sysID;
*/
//cut out the first 8 bits
PVSSlonglong tSys1 = (PVSSlonglong) ( (PVSSlonglong) sysID & 0xFF);
PVSSlonglong tSys2 = (PVSSlonglong) (( (PVSSlonglong) sysID >> 8) & 0xFFFF);

PVSSlonglong elemID = (((PVSSlonglong) tSys2) << 56) +
(((PVSSlonglong) dpId) << 24) +
(((PVSSlonglong) dpeId) << 8) +
(PVSSlonglong) tSys1;
return elemID;

Best Regards
Leopold Knipp
Senior Support Specialist