Experimental Physics and
Industrial Control System

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<== Date ==>		<== Thread ==>

Subject:	EPICS database Feature request
From:	Emmanuel Mayssat <[email protected]>
To:	EPICS mailing list <[email protected]>
Date:	Fri, 6 Jun 2014 08:22:43 -0700

Hello all,

A feature I use a lot with my db file is overwriting a record, ie:

record(ao, "myAO") {

field(VAL, "20")

field(DRVH, "40")

}

and later in the same or another db file

record(ao, "myAO") {

field(VAL, "21")

field(FLNK, "AnotherAO")

}

The above is equivalent to 1 single entry with

record(ao, "mAO") {

field(VAL, "21")

field(DRVH, "40")

field(FLNK, "AnotherAO")

}

Now the issue is that to overwrite the field of a record, you need to know its type (i.e. ao) as you need to repeat the record line.

Is it possible to have a database entry (maybe like the alias entry) where you could just say:

changefield("myAO", VAL, 21)

which doesn't create the record if it doesn't exist, but which perform the equivalent to

record(ao, "myAO") {

field(VAL, "21")

}

if it does.

Maybe a similar command already exist.

If so let me know,

Emmanuel

Replies:: Re: EPICS database Feature request Shen, Guobao; Re: EPICS database Feature request Pearson, Matthew R.; Re: EPICS database Feature request Pete Jemian

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ANJ, 17 Dec 2015