/// <summary>
/// 删除
/// </summary>
public static void Delete(DataContentEntity modelDC)
{
modelDC.ContentPage.Contents.Remove(modelDC);
//写入文件
modelDC.Table.DataFile.FileStream.Seek(modelDC.ContentPage.PageID * Config.PAGE_SIZE + ContentPageEntity.CONTENT_START + modelDC.ContentIndex * modelDC.Column.DataLength, SeekOrigin.Begin);
modelDC.Table.DataFile.FileStream.Write(new byte[modelDC.Column.DataLength], 0, modelDC.Column.DataLength);
}
/// <summary>
/// 创建
/// </summary>
public static void Create(DataColumnEntity modelDT, DataContentEntity modelDC, int RowIndex)
{
//赋值
modelDC.ContentPage = GetPage(modelDT, RowIndex);
modelDC.ContentIndex = RowIndex % ((Config.PAGE_SIZE - ContentPageEntity.CONTENT_START) / modelDT.DataLength);
modelDC.Column = modelDT;
//写入列
modelDC.ContentPage.Contents.Add(modelDC);
//写入文件
modelDT.Table.DataFile.FileStream.Seek(modelDC.ContentPage.PageID * Config.PAGE_SIZE+ ContentPageEntity.CONTENT_START + modelDC.ContentIndex * modelDT.DataLength, SeekOrigin.Begin);
modelDT.Table.DataFile.FileStream.Write(modelDC.ToBytes(), 0, modelDT.DataLength);
}
/// <summary>
/// 修改
/// </summary>
public static void Update(DataContentEntity modelDC)
{
//写入文件
modelDC.Table.DataFile.FileStream.Seek(modelDC.ContentPage.PageID * Config.PAGE_SIZE + ContentPageEntity.CONTENT_START + modelDC.ContentIndex * modelDC.Column.DataLength, SeekOrigin.Begin);
modelDC.Table.DataFile.FileStream.Write(modelDC.ToBytes(), 0, modelDC.Column.DataLength);
}
/// <summary>
/// 从byte[]中读取
/// </summary>
/// <param name="arr"></param>
public void FromBytes(byte[] arr)
{
NextPageID = BitConverter.ToInt64(arr, NEXTPAGEID_START);
Contents = new List<DataContentEntity>();
if (Column.Type == EColumnType.RowIndex)
{
for (int i = 0; i < (Config.PAGE_SIZE - CONTENT_START) / Column.DataLength; i++)
{
byte[] temp = new byte[Column.DataLength];
temp = ByteUtil.ReadBytes(arr, i * Column.DataLength + CONTENT_START, Column.DataLength);
if (ByteUtil.IsNotZero(temp))
{
DataContentEntity modelDT = new DataContentEntity();
modelDT.ContentPage = this;
modelDT.ContentIndex = i;
modelDT.Column = Column;
modelDT.FromBytes(temp);
Contents.Add(modelDT);
}
}
}
else
{
//获取行索引
List<int> listRowIndex = DataTableManage.GetRowIndexList(Table);
for (int i = 0; i < Column.PageMaxCount; i++)
{
if (listRowIndex.Contains(PageIndex * Column.PageMaxCount + i))
{
byte[] temp = new byte[Column.DataLength];
temp = ByteUtil.ReadBytes(arr, i * Column.DataLength + CONTENT_START, Column.DataLength);
DataContentEntity modelDT = new DataContentEntity();
modelDT.ContentPage = this;
modelDT.ContentIndex = i;
modelDT.Column = Column;
modelDT.FromBytes(temp);
Contents.Add(modelDT);
}
}
}
}
