public List <GeneratingStationOwnerForeign> ExtractGeneratingStationOwnersForeign(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 PARENT_ENTITY = 'GENERATING_STATION' 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 <GeneratingStationOwnerForeign> genStationOwnersForeign = new List <GeneratingStationOwnerForeign>();
while (reader.Read())
{
GeneratingStationOwnerForeign genStationOwnerForeign = new GeneratingStationOwnerForeign();
genStationOwnerForeign.WebUatId = reader.GetInt32(0);
genStationOwnerForeign.GeneratingStationWebUatId = reader.GetInt32(1);
genStationOwnerForeign.OwnerWebUatId = reader.GetInt32(2);
genStationOwnersForeign.Add(genStationOwnerForeign);
}
reader.Dispose();
return(genStationOwnersForeign);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return(null);
}
}
}
}
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);
}
