private EntityStateDetector()
{
this.ExistsStrategy = new Lazy <EntityStateDetectorExistsStrategy>(() =>
{
foreach (var column in this.Table.PrimaryKeys)
{
if (column.Flags.HasFlag(ColumnFlags.Generated))
{
continue;
}
return(item =>
{
var query = this.Database.QueryCache.Exists(this.Table);
var parameters = new PrimaryKeysParameterHandlerStrategy(this.Table, item);
var exists = this.Database.ExecuteScalar <bool>(query, parameters.Handler, this.Transaction);
if (exists)
{
return EntityState.Exists;
}
return EntityState.None;
});
}
return(item =>
{
if (EntityKey.HasKey(this.Table, item))
{
return EntityState.Exists;
}
return EntityState.None;
});
});
this.FetchStrategy = new Lazy <EntityStateDetectorFetchStrategy>(() =>
{
return((object item, out object persisted) =>
{
if (EntityKey.HasKey(this.Table, item))
{
var set = this.Database.Set(item.GetType(), this.Database.Source(this.Composer, this.Transaction));
persisted = set.Find(EntityKey.GetKey(this.Table, item));
if (persisted != null)
{
return EntityState.Exists;
}
}
persisted = null;
return EntityState.None;
});
});
}
public bool KeyChanged(ITableConfig table)
{
if (!this.Exists(table))
{
return(false);
}
var key = default(object);
if (!this.HasKey(table, out key))
{
return(true);
}
var item = this.Get(table);
if (!EqualityComparerFactory.Instance.Create(table.PrimaryKey.Property.PropertyType).Equals(EntityKey.GetKey(table, item), key))
{
return(true);
}
return(false);
}
