public List <SubstationOwnerForeign> ExtractSubstationOwnersForeign(string oracleConnString)
{
using (OracleConnection con = new OracleConnection(oracleConnString))
{
using (OracleCommand cmd = con.CreateCommand())
{
try
{
con.Open();
cmd.BindByName = true;
cmd.CommandText = "select ID, PARENT_ENTITY_ATTRIBUTE_ID, CHILD_ENTITY_ATTRIBUTE_ID from ENTITY_ENTITY_RELN where :id=1 and PARENT_ENTITY='ASSOCIATE_SUBSTATION' and CHILD_ENTITY='OWNER' and PARENT_ENTITY_ATTRIBUTE='Owner' and CHILD_ENTITY_ATTRIBUTE='OwnerId'";
// Assign id parameter
OracleParameter id = new OracleParameter("id", 1);
cmd.Parameters.Add(id);
//Execute the command and use DataReader to display the data
OracleDataReader reader = cmd.ExecuteReader();
List <SubstationOwnerForeign> ssOwnersForeign = new List <SubstationOwnerForeign>();
while (reader.Read())
{
SubstationOwnerForeign ssOwnerForeign = new SubstationOwnerForeign();
ssOwnerForeign.WebUatId = reader.GetInt32(0);
ssOwnerForeign.SubstationWebUatId = reader.GetInt32(1);
ssOwnerForeign.OwnerWebUatId = reader.GetInt32(2);
ssOwnersForeign.Add(ssOwnerForeign);
}
reader.Dispose();
return(ssOwnersForeign);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return(null);
}
}
}
}
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);
}
