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A Data Entry is an IMAS concept for designating a pulse with given shot and run numbers located in some database (see below).
The methods exposed by HLIs are:
- Operations on data base entry:
- CREATE
- OPEN
- CLOSE
- Operations on IDSs:
- PUT
- GET
- PUT_SLICE
- GET_SLICE
- DELETE
In this tutorial, we will describe each method of the HLI API (section 1.1. HLI API).
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The pulse file is opened, however no data have been yet fetched from the pulse file.
put put/close
IDSs are data containers described by the IMAS Data Dictionary. IDSs represent either a Diagnostics (like the 'bolometer' IDS), or a System (like the 'camera_ir'), or a concept like the 'equilibrium' IDS representing the plasma equilibrium.
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Let'read the 'magnetics' IDS previously created in put/closein 1.1.3.
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import imas import getpass import numpy as np from imas import imasdef #opens the Data Entry object 'data_entry' associated to the pulse file with shot=15000, run=1, belonging to database 'data_access_tutorial' of the current user, using the MDS+ backend data_entry = imas.DBEntry(imasdef.MDSPLUS_BACKEND, 'data_access_tutorial, 15000, 1, user_name=getpass.getuser()) #opens the pulse file associated to the Data Entry object 'data_entry' previously created data_entry.open() magnetics_ids = imas.magnetics() #creating a #reads the 'magnetics' IDS magnetics_ids.ids_properties.homogeneous_time=1 #setting from the homogeneous time (mandatory) magnetics_ids.ids_properties.comment='IDS created for testing the IMAS Data Access layer' magnetics_ids.time=np.array([0]) #the time(vector) basis must be not empty if homogeneous_time==1 otherwise an error will occur at runtime data_entry object previously opened data_entry.putget('magnetics_ids', 0) #writing magnetics data to the data_entry associated to the pulse file. The #The second argument 0 is the so-called IDS occurrence. #close the pulse file associated to the 'data_entry' object data_entry.close() #print some IDS attributes print('homogeneous_time = ', magnetics_ids.ids_properties.homogeneous_time) print('comment = ', magnetics_ids.ids_properties.comment) |
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$ python get.py
homogeneous_time = 1
comment = IDS created for testing the IMAS Data Access layer |