/// <summary>
/// Deletes row.
/// </summary>
/// <param name="rowId"></param>
public void Delete(RowId rowId)
{
Debug.Assert(0 <= rowId.Value && rowId.Value < this.table.Count, "broken rowId");
this.ValidateModification();
ValueList <Row> .Address address = this.table.ItemAddress(rowId.Value);
SnapTable <TRecord> .ValidateModification(ref address);
this.PushToLog(ref address.Page[address.Index], rowId);
// if the row was inserted in this transaction, then after deletion it will be invalid. so just ignore it in all future operations
address.Page[address.Index].IsDeleted = true;
}
/// <summary>
/// Sets entire structure.
/// </summary>
/// <param name="rowId"></param>
/// <param name="data"></param>
/// <returns></returns>
public bool SetData(RowId rowId, ref TRecord data)
{
Debug.Assert(0 <= rowId.Value && rowId.Value < this.table.Count, "broken rowId");
this.ValidateModification();
ValueList <Row> .Address address = this.table.ItemAddress(rowId.Value);
SnapTable <TRecord> .ValidateModification(ref address);
if (TableSnapshot <TRecord> .Compare(this.Fields, ref address.Page[address.Index].Data, ref data) != 0)
{
this.PushToLog(ref address.Page[address.Index], rowId);
address.Page[address.Index].Data = data;
Debug.Assert(TableSnapshot <TRecord> .Compare(this.Fields, ref address.Page[address.Index].Data, ref data) == 0, "Assignment or comparison failed");
return(true);
}
return(false);
}
/// <summary>
/// Updates field of the row
/// </summary>
/// <typeparam name="TField"></typeparam>
/// <param name="rowId"></param>
/// <param name="field"></param>
/// <param name="value"></param>
/// <returns></returns>
public bool SetField <TField>(RowId rowId, IField <TRecord, TField> field, TField value)
{
Debug.Assert(0 <= rowId.Value && rowId.Value < this.table.Count, "broken rowId");
this.ValidateModification();
// It is only possible to set value via basic fields defined on table.
this.ValidateField(field);
ValueList <Row> .Address address = this.table.ItemAddress(rowId.Value);
SnapTable <TRecord> .ValidateModification(ref address);
if (field.Compare(field.GetValue(ref address.Page[address.Index].Data), value) != 0)
{
this.PushToLog(ref address.Page[address.Index], rowId);
field.SetValue(ref address.Page[address.Index].Data, value);
Debug.Assert(field.Compare(field.GetValue(ref address.Page[address.Index].Data), value) == 0, "Assignment or comparison failed");
return(true);
}
return(false);
}