public List <MajorSubstationForeign> ExtractMajorSubstationsForeign(string oracleConnString)
{
using (OracleConnection con = new OracleConnection(oracleConnString))
{
using (OracleCommand cmd = con.CreateCommand())
{
try
{
con.Open();
cmd.BindByName = true;
cmd.CommandText = "select ID, NAME, STATE_ID from MAJOR_SUBSTATION where :id=1 and NAME IS NOT NULL and ID IS NOT NULL and STATE_ID IS NOT NULL";
// 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 <MajorSubstationForeign> majorSubstationsForeign = new List <MajorSubstationForeign>();
while (reader.Read())
{
MajorSubstationForeign majorSSForeign = new MajorSubstationForeign();
majorSSForeign.WebUatId = reader.GetInt32(0);
majorSSForeign.Name = reader.GetString(1);
majorSSForeign.StateWebUatId = reader.GetInt32(2);
majorSubstationsForeign.Add(majorSSForeign);
}
reader.Dispose();
return(majorSubstationsForeign);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return(null);
}
}
}
}
public async Task <MajorSubstation> LoadSingleAsync(WRLDCWarehouseDbContext _context, ILogger _log, MajorSubstationForeign majorSSForeign, EntityWriteOption opt)
{
// check if entity already exists
MajorSubstation existingMajorSS = await _context.MajorSubstations.SingleOrDefaultAsync(mss => mss.WebUatId == majorSSForeign.WebUatId);
// check if we should not modify existing entities
if (opt == EntityWriteOption.DontReplace && existingMajorSS != null)
{
return(existingMajorSS);
}
// find the region of the state via the region WebUatId
int stateWebUatId = majorSSForeign.StateWebUatId;
State majorSSState = await _context.States.SingleOrDefaultAsync(s => s.WebUatId == stateWebUatId);
// if state doesnot exist, skip the import. Ideally, there should not be such case
if (majorSSState == null)
{
_log.LogCritical($"Unable to find State with webUatId {stateWebUatId} while inserting MajorSubstation with webUatId {majorSSForeign.WebUatId} and name {majorSSForeign.Name}");
return(null);
}
// if entity is not present, then insert
if (existingMajorSS == null)
{
MajorSubstation newMajorSS = new MajorSubstation();
newMajorSS.Name = majorSSForeign.Name;
newMajorSS.StateId = majorSSState.StateId;
newMajorSS.WebUatId = majorSSForeign.WebUatId;
_context.MajorSubstations.Add(newMajorSS);
await _context.SaveChangesAsync();
return(newMajorSS);
}
// check if we have to replace the entity completely
if (opt == EntityWriteOption.Replace && existingMajorSS != null)
{
_context.MajorSubstations.Remove(existingMajorSS);
MajorSubstation newMajorSS = new MajorSubstation();
newMajorSS.Name = majorSSForeign.Name;
newMajorSS.StateId = majorSSState.StateId;
newMajorSS.WebUatId = majorSSForeign.WebUatId;
_context.MajorSubstations.Add(newMajorSS);
await _context.SaveChangesAsync();
return(newMajorSS);
}
// check if we have to modify the entity
if (opt == EntityWriteOption.Modify && existingMajorSS != null)
{
existingMajorSS.Name = majorSSForeign.Name;
existingMajorSS.StateId = majorSSState.StateId;
await _context.SaveChangesAsync();
return(existingMajorSS);
}
return(null);
}
