public List <HvdcLineCktOwnerForeign> ExtractHvdcLineCktOwnersForeign(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 REPORTING_WEB_UI_UAT.ENTITY_ENTITY_RELN
WHERE PARENT_ENTITY='HVDC_LINE' 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 <HvdcLineCktOwnerForeign> cktOwnersForeign = new List <HvdcLineCktOwnerForeign>();
while (reader.Read())
{
HvdcLineCktOwnerForeign cktOwnerForeign = new HvdcLineCktOwnerForeign();
cktOwnerForeign.WebUatId = reader.GetInt32(0);
cktOwnerForeign.HvdcLineCktWebUatId = reader.GetInt32(1);
cktOwnerForeign.OwnerWebUatId = reader.GetInt32(2);
cktOwnersForeign.Add(cktOwnerForeign);
}
reader.Dispose();
return(cktOwnersForeign);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return(null);
}
}
}
}
public async Task <HvdcLineCktOwner> LoadSingleAsync(WRLDCWarehouseDbContext _context, ILogger _log, HvdcLineCktOwnerForeign cktOwnerForeign, EntityWriteOption opt)
{
// check if entity already exists
HvdcLineCktOwner existingCktOwner = await _context.HvdcLineCktOwners.SingleOrDefaultAsync(cO => cO.WebUatId == cktOwnerForeign.WebUatId);
// check if we should not modify existing entities
if (opt == EntityWriteOption.DontReplace && existingCktOwner != null)
{
return(existingCktOwner);
}
// find the HvdcLineCkt via the HvdcLineCkt WebUatId
int cktWebUatId = cktOwnerForeign.HvdcLineCktWebUatId;
HvdcLineCkt ckt = await _context.HvdcLineCkts.SingleOrDefaultAsync(c => c.WebUatId == cktWebUatId);
// if HvdcLineCkt doesnot exist, skip the import. Ideally, there should not be such case
if (ckt == null)
{
_log.LogCritical($"Unable to find HvdcLineCkt with webUatId {cktWebUatId} while inserting HvdcLineCktOwner with webUatId {cktOwnerForeign.WebUatId}");
return(null);
}
// find the Owner of the HvdcLineCkt via the Owner WebUatId
int ownerWebUatId = cktOwnerForeign.OwnerWebUatId;
Owner owner = await _context.Owners.SingleOrDefaultAsync(o => o.WebUatId == ownerWebUatId);
// if owner doesnot exist, skip the import. Ideally, there should not be such case
if (owner == null)
{
_log.LogCritical($"Unable to find Owner with webUatId {ownerWebUatId} while inserting HvdcLineCktOwner with webUatId {cktOwnerForeign.WebUatId}");
return(null);
}
try
{
// check if we have to replace the entity completely
if (opt == EntityWriteOption.Replace && existingCktOwner != null)
{
_context.HvdcLineCktOwners.Remove(existingCktOwner);
}
// if entity is not present, then insert or check if we have to replace the entity completely
if (existingCktOwner == null || (opt == EntityWriteOption.Replace && existingCktOwner != null))
{
HvdcLineCktOwner newCktOwner = new HvdcLineCktOwner();
newCktOwner.OwnerId = owner.OwnerId;
newCktOwner.HvdcLineCktId = ckt.HvdcLineCktId;
newCktOwner.WebUatId = cktOwnerForeign.WebUatId;
_context.HvdcLineCktOwners.Add(newCktOwner);
await _context.SaveChangesAsync();
return(newCktOwner);
}
// check if we have to modify the entity
if (opt == EntityWriteOption.Modify && existingCktOwner != null)
{
existingCktOwner.OwnerId = owner.OwnerId;
existingCktOwner.HvdcLineCktId = ckt.HvdcLineCktId;
await _context.SaveChangesAsync();
return(existingCktOwner);
}
}
catch (DbUpdateException e)
{
_log.LogCritical($"Error occured while inserting HvdcLineCktOwner with webUatId {cktOwnerForeign.WebUatId}, owner id {owner.OwnerId} and cktId {ckt.HvdcLineCktId}");
_log.LogCritical($"EntityWriteOption = {opt.ToString()}");
_log.LogCritical($"{e.Message}");
return(null);
}
return(null);
}