public async Task ImportForeignGeneratingStationOwners(WRLDCWarehouseDbContext _context, ILogger _log, string oracleConnStr, EntityWriteOption opt)
{
GeneratingStationOwnerExtract genStationOwnerExtract = new GeneratingStationOwnerExtract();
List <GeneratingStationOwnerForeign> genStationOwnersForeign = genStationOwnerExtract.ExtractGeneratingStationOwnersForeign(oracleConnStr);
LoadGeneratingStationOwner loadGenStationOwner = new LoadGeneratingStationOwner();
foreach (GeneratingStationOwnerForeign genStationOwnerForeign in genStationOwnersForeign)
{
GeneratingStationOwner insertedGenStationOwner = await loadGenStationOwner.LoadSingleAsync(_context, _log, genStationOwnerForeign, opt);
}
}
public async Task <GeneratingStationOwner> LoadSingleAsync(WRLDCWarehouseDbContext _context, ILogger _log, GeneratingStationOwnerForeign genStationOwnerForeign, EntityWriteOption opt)
{
// check if entity already exists
GeneratingStationOwner existingGenStationOwner = await _context.GeneratingStationOwners.SingleOrDefaultAsync(gso => gso.WebUatId == genStationOwnerForeign.WebUatId);
// check if we should not modify existing entities
if (opt == EntityWriteOption.DontReplace && existingGenStationOwner != null)
{
return(existingGenStationOwner);
}
// find the GeneratingStation via the GeneratingStation WebUatId
int genStationWebUatId = genStationOwnerForeign.GeneratingStationWebUatId;
GeneratingStation genStation = await _context.GeneratingStations.SingleOrDefaultAsync(gs => gs.WebUatId == genStationWebUatId);
// if GeneratingStation doesnot exist, skip the import. Ideally, there should not be such case
if (genStation == null)
{
_log.LogCritical($"Unable to find GeneratingStation with webUatId {genStationWebUatId} while inserting GeneratingStationOwner with webUatId {genStationOwnerForeign.WebUatId}");
return(null);
}
// find the Owner of the substation via the Owner WebUatId
int ownerWebUatId = genStationOwnerForeign.OwnerWebUatId;
Owner owner = await _context.Owners.SingleOrDefaultAsync(o => o.WebUatId == ownerWebUatId);
// if owner doesnot exist, skip the import. Ideally, there should not be such case
if (owner == null)
{
_log.LogCritical($"Unable to find Owner with webUatId {ownerWebUatId} while inserting GeneratingStationOwner with webUatId {genStationOwnerForeign.WebUatId}");
return(null);
}
// check if we have to replace the entity completely
if (opt == EntityWriteOption.Replace && existingGenStationOwner != null)
{
_context.GeneratingStationOwners.Remove(existingGenStationOwner);
}
// if entity is not present, then insert or check if we have to replace the entity completely
if (existingGenStationOwner == null || (opt == EntityWriteOption.Replace && existingGenStationOwner != null))
{
GeneratingStationOwner genStationOwner = new GeneratingStationOwner();
genStationOwner.OwnerId = owner.OwnerId;
genStationOwner.GeneratingStationId = genStation.GeneratingStationId;
genStationOwner.WebUatId = genStationOwnerForeign.WebUatId;
_context.GeneratingStationOwners.Add(genStationOwner);
await _context.SaveChangesAsync();
return(genStationOwner);
}
// check if we have to modify the entity
if (opt == EntityWriteOption.Modify && existingGenStationOwner != null)
{
existingGenStationOwner.OwnerId = owner.OwnerId;
existingGenStationOwner.GeneratingStationId = genStation.GeneratingStationId;
await _context.SaveChangesAsync();
return(existingGenStationOwner);
}
return(null);
}
