/// <summary>
/// 构造函数。
/// </summary>
/// <param name="tableName">表的名称</param>
/// <param name="primaryKey"> 要删除的行的主键</param>
public RowDeleteChange(String tableName, PrimaryKey primaryKey) : base(tableName, primaryKey)
{
}
public RowUpdateChange(String tableName, PrimaryKey primaryKey, long ts) : base(tableName, primaryKey)
{
this.timestamp = ts;
}