public async Task ImportForeignSubstationOwners(WRLDCWarehouseDbContext _context, ILogger _log, string oracleConnStr, EntityWriteOption opt)
{
SubstationOwnerExtract ssOwnerExtract = new SubstationOwnerExtract();
List <SubstationOwnerForeign> ssOwnersForeign = ssOwnerExtract.ExtractSubstationOwnersForeign(oracleConnStr);
LoadSubstationOwner loadSSOwner = new LoadSubstationOwner();
foreach (SubstationOwnerForeign ssOwnerForeign in ssOwnersForeign)
{
SubstationOwner insertedSSOwner = await loadSSOwner.LoadSingleAsync(_context, _log, ssOwnerForeign, opt);
}
}
public async Task <SubstationOwner> LoadSingleAsync(WRLDCWarehouseDbContext _context, ILogger _log, SubstationOwnerForeign ssOwnerForeign, EntityWriteOption opt)
{
// check if entity already exists
SubstationOwner existingSSOwner = await _context.SubstationOwners.SingleOrDefaultAsync(ssO => ssO.WebUatId == ssOwnerForeign.WebUatId);
// check if we should not modify existing entities
if (opt == EntityWriteOption.DontReplace && existingSSOwner != null)
{
return(existingSSOwner);
}
// find the Substation via the Substation WebUatId
int ssWebUatId = ssOwnerForeign.SubstationWebUatId;
Substation substation = await _context.Substations.SingleOrDefaultAsync(ss => ss.WebUatId == ssWebUatId);
// if Substation doesnot exist, skip the import. Ideally, there should not be such case
if (substation == null)
{
_log.LogCritical($"Unable to find Substation with webUatId {ssWebUatId} while inserting SubstationOwner with webUatId {ssOwnerForeign.WebUatId}");
return(null);
}
// find the Owner of the substation via the Owner WebUatId
int ownerWebUatId = ssOwnerForeign.OwnerWebUatId;
Owner owner = await _context.Owners.SingleOrDefaultAsync(o => o.WebUatId == ownerWebUatId);
// if owner doesnot exist, skip the import. Ideally, there should not be such case
if (owner == null)
{
_log.LogCritical($"Unable to find Owner with webUatId {ownerWebUatId} while inserting SubstationOwner with webUatId {ssOwnerForeign.WebUatId}");
return(null);
}
try
{
// check if we have to replace the entity completely
if (opt == EntityWriteOption.Replace && existingSSOwner != null)
{
_context.SubstationOwners.Remove(existingSSOwner);
}
// if entity is not present, then insert or check if we have to replace the entity completely
if (existingSSOwner == null || (opt == EntityWriteOption.Replace && existingSSOwner != null))
{
SubstationOwner newSSOwner = new SubstationOwner();
newSSOwner.OwnerId = owner.OwnerId;
newSSOwner.SubstationId = substation.SubstationId;
newSSOwner.WebUatId = ssOwnerForeign.WebUatId;
_context.SubstationOwners.Add(newSSOwner);
await _context.SaveChangesAsync();
return(newSSOwner);
}
// check if we have to modify the entity
if (opt == EntityWriteOption.Modify && existingSSOwner != null)
{
existingSSOwner.OwnerId = owner.OwnerId;
existingSSOwner.SubstationId = substation.SubstationId;
await _context.SaveChangesAsync();
return(existingSSOwner);
}
}
catch (DbUpdateException e)
{
_log.LogCritical($"Error occured while inserting SubstationOwner with webUatId {ssOwnerForeign.WebUatId}, owner id {owner.OwnerId} and ssId {substation.SubstationId}");
_log.LogCritical($"EntityWriteOption = {opt.ToString()}");
_log.LogCritical($"{e.Message}");
return(null);
}
return(null);
}
