public List <TransformerOwnerForeign> ExtractTransformerOwnersForeign(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='TRANSFORMER' and PARENT_ENTITY_ATTRIBUTE='Owner' and CHILD_ENTITY='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 <TransformerOwnerForeign> transOwnersForeign = new List <TransformerOwnerForeign>();
while (reader.Read())
{
TransformerOwnerForeign transOwnerForeign = new TransformerOwnerForeign();
transOwnerForeign.WebUatId = reader.GetInt32(0);
transOwnerForeign.TransformerWebUatId = reader.GetInt32(1);
transOwnerForeign.OwnerWebUatId = reader.GetInt32(2);
transOwnersForeign.Add(transOwnerForeign);
}
reader.Dispose();
return(transOwnersForeign);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return(null);
}
}
}
}
public async Task <TransformerOwner> LoadSingleAsync(WRLDCWarehouseDbContext _context, ILogger _log, TransformerOwnerForeign trOwnerForeign, EntityWriteOption opt)
{
// check if entity already exists
TransformerOwner existingTrOwner = await _context.TransformerOwners.SingleOrDefaultAsync(trO => trO.WebUatId == trOwnerForeign.WebUatId);
// check if we should not modify existing entities
if (opt == EntityWriteOption.DontReplace && existingTrOwner != null)
{
return(existingTrOwner);
}
// find the Transformer via the TransformerWebUatId
int trWebUatId = trOwnerForeign.TransformerWebUatId;
Transformer transformer = await _context.Transformers.SingleOrDefaultAsync(tr => tr.WebUatId == trWebUatId);
// if Transformer doesnot exist, skip the import. Ideally, there should not be such case
if (transformer == null)
{
_log.LogCritical($"Unable to find Transformer with webUatId {trWebUatId} while inserting TransformerOwner with webUatId {trOwnerForeign.WebUatId}");
return(null);
}
// find the Owner of the substation via the Owner WebUatId
int ownerWebUatId = trOwnerForeign.OwnerWebUatId;
Owner owner = await _context.Owners.SingleOrDefaultAsync(o => o.WebUatId == ownerWebUatId);
// if owner doesnot exist, skip the import. Ideally, there should not be such case
if (owner == null)
{
_log.LogCritical($"Unable to find Owner with webUatId {ownerWebUatId} while inserting TransformerOwner with webUatId {trOwnerForeign.WebUatId}");
return(null);
}
// check if we have to replace the entity completely
if (opt == EntityWriteOption.Replace && existingTrOwner != null)
{
_context.TransformerOwners.Remove(existingTrOwner);
}
// if entity is not present, then insert or check if we have to replace the entity completely
if (existingTrOwner == null || (opt == EntityWriteOption.Replace && existingTrOwner != null))
{
TransformerOwner newTrOwner = new TransformerOwner();
newTrOwner.OwnerId = owner.OwnerId;
newTrOwner.TransformerId = transformer.TransformerId;
newTrOwner.WebUatId = trOwnerForeign.WebUatId;
_context.TransformerOwners.Add(newTrOwner);
await _context.SaveChangesAsync();
return(newTrOwner);
}
// check if we have to modify the entity
if (opt == EntityWriteOption.Modify && existingTrOwner != null)
{
existingTrOwner.OwnerId = owner.OwnerId;
existingTrOwner.TransformerId = transformer.TransformerId;
await _context.SaveChangesAsync();
return(existingTrOwner);
}
return(null);
}
