def get_pv(self, name):
"""return pv by name
"""
if isinstance(name, PV):
return name
name = normalize_pvname(name)
out = self.query(PV).filter(PV.name==name).all()
ret = None_or_one(out, 'get_pv expected 1 or None PV')
# print 'instrument.get_pv ',name, out, ret
if ret is None and name.endswith('.VAL'):
name = name[:-4]
out = self.query(PV).filter(PV.name==name).all()
if out is not None:
# update pv name to end in '.VAL' here!
idx = out[0].id
self.tables['pv'].update(whereclause="id=%i" % idx).execute(name="%s.VAL" % name)
ret = None_or_one(out, 'get_pv expected 1 or None PV')
return ret
def add_pv(self, name, notes=None, attributes=None, pvtype=None, **kws):
"""add pv
notes and attributes optional
returns PV instance"""
name = normalize_pvname(name)
out = self.query(PV).filter(PV.name==name).all()
if len(out) > 0:
return
kws['notes'] = notes
kws['attributes'] = attributes
row = self.__addRow(PV, ('name',), (name,), **kws)
if pvtype is None:
self.pvs[name] = epics.PV(name)
self.pvs[name].get()
pvtype = get_pvtypes(self.pvs[name])[0]
self.set_pvtype(name, pvtype)
self.session.add(row)
self.commit()
return row
