public Column(IDataReader dr)
{
this.ColumnId = Convert.ToInt32(dr["Column_id"]);
this.Name = Convert.ToString(dr["ColumnName"]);
this.DBTypeName = Convert.ToString(dr["Type"]);
this.Length = Convert.ToInt32(dr["Length"]);
this.Precision = Convert.ToInt32(dr["Precision"]);
this.Scale = Convert.ToInt32(dr["SCALE"]);
this.IsIdentity = Convert.ToBoolean(dr["IDENTITY"]);
this.IsPrimaryKey = Convert.ToBoolean(dr["PrimaryKey"]);
this.NullAble = Convert.ToBoolean(dr["NullAble"]);
this.Remarks = Convert.ToString(dr["ColumnDesc"]);
this.Default = Convert.ToString(dr["Default"]);
this.CreateTime = Convert.ToDateTime(dr["Create_Date"]);
this.ModifyTime = Convert.ToDateTime(dr["Modify_Date"]);
//this.IsAssistant=
string csTypeName, convertFormat;
TypeMappings.GetTypeName(DBTypeName, out csTypeName, out convertFormat);
this.CSTypeName = csTypeName;
this.ConvertFormat = convertFormat;
}