public bool Delete <TEntity> (IID entity) where TEntity : class
{
if (Connection == null)
{
throw new Exception("No connection to database");
}
try
{
Type baseType = typeof(TEntity);
TableAttribute ta = null;
while (true)
{
ta = (TableAttribute)Attribute.GetCustomAttribute(baseType, typeof(TableAttribute));
if (ta != null)
{
break;
}
baseType = baseType.BaseType;
if (baseType == null)
{
break;
}
}
if (ta == null)
{
throw new ArgumentException("Failed to find Table of " + typeof(TEntity).ToString( ));
}
using (CSDB context = new CSDB(Connection))
{
#if (DEBUG)
TextWriter log = new StringWriter();
context.Log = log;
#endif
TEntity t = GetSingle <TEntity> (entity.ID, context);
context.GetTable(baseType).DeleteOnSubmit(t);
context.SubmitChanges( );
#if (UseCache)
cache.DeleteItemFromCache(baseType, ((IID)t).ID);
#endif
return(true);
}
}
catch (Exception ex)
{
ChampionshipSolutions.Diag.Diagnostics.LogLine("Error deleting entity from database of type " + typeof(TEntity).ToString( ));
ChampionshipSolutions.Diag.Diagnostics.LogLine(ex.Message);
return(false);
}
}
private bool addRange <TEntity> (TEntity[] entities) where TEntity : class
{
if (Connection == null)
{
throw new Exception("No connection to database");
}
try
{
ArrayList newEntities = new ArrayList(entities.Count());
TEntity newEntity;
// determine type here
var type = typeof(TEntity); //.GetType(); // entities.GetType();
foreach (IID entity in entities)
{
// create an object of the type
newEntity = (TEntity)Activator.CreateInstance(type);
MakeObjectsEqual(newEntity, entity);
newEntities.Add(newEntity);
}
using (CSDB context = new CSDB(Connection))
{
TEntity[] array = (TEntity[])newEntities.ToArray();
context.GetTable <TEntity> ( ).InsertAllOnSubmit(array);
context.SubmitChanges( );
}
for (int i = 0; i < entities.Count( ); i++)
{
((IID)entities[i]).ID = ((IID)newEntities[i]).ID;
((IID)entities[i]).Discriminator = ((IID)newEntities[i]).Discriminator;
cache.AddToCache(type, (IID)entities[i]);
}
return(true);
}
catch (Exception ex)
{
ChampionshipSolutions.Diag.Diagnostics.LogLine("Error inserting range into database of type " + typeof(TEntity).ToString( ));
ChampionshipSolutions.Diag.Diagnostics.LogLine(ex.Message);
return(false);
}
}
public bool DeleteRange <TEntity> (TEntity[] entities) where TEntity : class
{
if (Connection == null)
{
throw new Exception("No connection to database");
}
try
{
using (CSDB context = new CSDB(Connection))
{
// retrieve entities from context
HashSet <TEntity> ToBeDeleted = new HashSet <TEntity>();
foreach (IID entity in entities)
{
TEntity t = GetSingle <TEntity> (entity.ID, context);
if (t != null)
{
ToBeDeleted.Add(t);
}
}
if (ToBeDeleted.Count == 0)
{
return(false);
}
context.GetTable <TEntity> ( ).DeleteAllOnSubmit(ToBeDeleted);
context.SubmitChanges( );
foreach (IID entity in entities)
{
cache.DeleteItemFromCache(typeof(TEntity), ((IID)entity).ID);
}
return(true);
}
}
catch (Exception ex)
{
ChampionshipSolutions.Diag.Diagnostics.LogLine("Error deleting range from database of type " + typeof(TEntity).ToString( ));
ChampionshipSolutions.Diag.Diagnostics.LogLine(ex.Message);
return(false);
}
}
private bool add <TEntity> (TEntity entity) where TEntity : class
{
if (Connection == null)
{
throw new Exception("No connection to database");
}
try
{
TEntity newEntity;
// determine type here
var type = entity.GetType();
Type baseType = typeof(TEntity);
TableAttribute ta = null;
while (true)
{
ta = (TableAttribute)Attribute.GetCustomAttribute(baseType, typeof(TableAttribute));
if (ta != null)
{
break;
}
baseType = baseType.BaseType;
if (baseType == null)
{
break;
}
}
if (ta == null)
{
throw new ArgumentException("Failed to find Table of " + typeof(TEntity).ToString( ));
}
// create an object of the type
newEntity = (TEntity)Activator.CreateInstance(type);
MakeObjectsEqual(newEntity, entity);
using (CSDB context = new CSDB(Connection))
{
context.GetTable <TEntity> ( ).InsertOnSubmit(newEntity);
context.SubmitChanges( );
}
((IID)entity).ID = ((IID)newEntity).ID;
((IID)entity).Discriminator = ((IID)newEntity).Discriminator;
cache.AddToCache(baseType, (IID)entity);
return(true);
}
catch (Exception ex)
{
ChampionshipSolutions.Diag.Diagnostics.LogLine("Error inserting into database of type " + typeof(TEntity).ToString());
ChampionshipSolutions.Diag.Diagnostics.LogLine(ex.Message);
return(false);
}
}
public TEntity GetID <TEntity> (int?ID) where TEntity : class
{
if (ID == null)
{
return(null);
}
if (Connection == null)
{
throw new Exception("No connection to database");
}
Type baseType = typeof(TEntity);
TableAttribute ta = null;
while (true)
{
ta = (TableAttribute)Attribute.GetCustomAttribute(baseType, typeof(TableAttribute));
if (ta != null)
{
break;
}
baseType = baseType.BaseType;
if (baseType == null)
{
break;
}
}
if (ta == null)
{
throw new ArgumentException("Failed to find Table of " + typeof(TEntity).ToString( ));
}
#if (UseCache)
// Try to get the data from the cache first
bool deleted;
TEntity cacheObj = (TEntity)cache.GetFromCache(baseType, ID.Value, out deleted);
if (deleted)
{
return(null);
}
if (cacheObj != null)
{
CacheReadCounter++;
return(cacheObj);
}
#endif
// could not find this item in the cache or it needs updating.
using (CSDB context = new CSDB(Connection))
{
TEntity temp = context.GetTable(baseType).OfType <TEntity>().Where(t => ((IID)t).ID == ID).ToList( ).FirstOrDefault();
if (temp != null)
{
if (typeof(IID).IsAssignableFrom(typeof(TEntity)))
{
((IID)temp).DState = getDataState( );
#if (UseCache)
cache.AddToCache(baseType, (IID)temp);
#endif
}
}
DBReadCounter++;
return(temp);
}
}
public IList <TEntity> GetAll <TEntity> ( ) where TEntity : class
{
if (Connection == null)
{
throw new Exception("No connection to database");
}
// try to get the Table (base) type instead of T
Type baseType = typeof(TEntity);
TableAttribute ta = null;
while (true)
{
ta = (TableAttribute)Attribute.GetCustomAttribute(baseType, typeof(TableAttribute));
if (ta != null)
{
break;
}
baseType = baseType.BaseType;
if (baseType == null)
{
break;
}
}
if (ta == null)
{
throw new ArgumentException("Failed to find Table of " + typeof(TEntity).ToString( ));
}
#if (UseCache)
// Try to get the data from the cache first
var cacheTable = cache.GetTableFromCache(baseType);
if (cacheTable != null)
{
CacheReadCounter++;
// Casting list makes sure that only valid items are returned.
// For example if TEntity is Athlete then we need to remove all
// objects of type person.
List <TEntity> castingList = new List <TEntity>();
foreach (var i in cacheTable)
{
if (i is TEntity)
{
castingList.Add((TEntity)i);
}
}
return(castingList.Cast <TEntity> ( ).ToList( ));
}
// could not find this item in the cache or it needs updating.
#endif
using (CSDB context = new CSDB(Connection))
{
context.DeferredLoadingEnabled = false;
IList <TEntity> temp = context.GetTable(baseType).OfType <TEntity>().ToList( );
if (typeof(IID).IsAssignableFrom(typeof(TEntity)))
{
foreach (TEntity ent in temp)
{
((IID)ent).DState = getDataState( );
}
#if (UseCache)
cache.AddTableToCache(baseType, temp.Cast <IID>().ToList());
#endif
}
DBReadCounter++;
return(temp);
}
}