首先，这个需要使用ODAC，也就是Oracle.DataAccess.dll，新出的托管Oracle.ManagedDataAccess.dll不支持Object Type，无法使用 ODAC
下载地址参考：http://www.oracle.com/technetwork/topics/dotnet/utilsoft-086879.html
ODAC使用方法参考：http://blog.csdn.net/rrrrssss00/article/details/7178515
代码见附件http://www.kuaipan.cn/file/id_22823997376823621.htm，大致思路是：先根据SDO_GEOMETRY对象的内容，在C#中构建一个对应的类，然后在读取和写入时使用OracleParameter来操作这个类的对象，达到读取和写入
数据库SDO_GEOMETRY对象的目的
类名为SdoGeometry，主要代码如下（其中还用到了自定义的SdoPoint，
OracleArrayTypeFactory和OracleCustomTypeBase类，其代码见附件的相应文件）
[OracleCustomTypeMappingAttribute("MDSYS.SDO_GEOMETRY")]
public class SdoGeometry : OracleCustomTypeBase
{
private enum OracleObjectColumns { SDO_GTYPE, SDO_SRID, SDO_POINT, SDO_ELEM_INFO, SDO_ORDINATES }
private decimal sdo_Gtype;
[OracleObjectMappingAttribute(0)]
public decimal Sdo_Gtype
{
get { return sdo_Gtype; }
set { sdo_Gtype = value; }
}
private decimal sdo_Srid;
[OracleObjectMappingAttribute(1)]
public decimal Sdo_Srid
{
get { return sdo_Srid; }
set { sdo_Srid = value; }
}
private SdoPoint point;
[OracleObjectMappingAttribute(2)]
public SdoPoint Point
{
get { return point; }
set { point = value; }
}
private decimal[] elemArray;
[OracleObjectMappingAttribute(3)]
public decimal[] ElemArray
{
get { return elemArray; }
set { elemArray = value; }
}
private decimal[] ordinatesArray;
[OracleObjectMappingAttribute(4)]
public decimal[] OrdinatesArray
{
get { return ordinatesArray; }
set { ordinatesArray = value; }
}
[OracleCustomTypeMappingAttribute("MDSYS.SDO_ELEM_INFO_ARRAY")]
public class ElemArrayFactory : OracleArrayTypeFactoryBase {}
[OracleCustomTypeMappingAttribute("MDSYS.SDO_ORDINATE_ARRAY")]
public class OrdinatesArrayFactory : OracleArrayTypeFactoryBase {}
public override void MapFromCustomObject()
{
SetValue((int)OracleObjectColumns.SDO_GTYPE, Sdo_Gtype);
SetValue((int)OracleObjectColumns.SDO_SRID, Sdo_Srid);
SetValue((int)OracleObjectColumns.SDO_POINT, Point);
SetValue((int)OracleObjectColumns.SDO_ELEM_INFO, ElemArray);
SetValue((int)OracleObjectColumns.SDO_ORDINATES, OrdinatesArray);
}
public override void MapToCustomObject()
{
Sdo_Gtype = GetValue((int)OracleObjectColumns.SDO_GTYPE);
Sdo_Srid = GetValue((int)OracleObjectColumns.SDO_SRID);
Point = GetValue((int)OracleObjectColumns.SDO_POINT);
ElemArray = GetValue((int)OracleObjectColumns.SDO_ELEM_INFO);
OrdinatesArray = GetValue((int)OracleObjectColumns.SDO_ORDINATES);
}
}
从数据库里读取的代码为（示例表只有两列，id列为number类型,geo列为SDO_GEOMTRY类型）：
OracleCommand cmd = new OracleCommand()
cmd.Connection = con;
cmd.CommandType = CommandType.Text;
cmd.CommandText = " select id,geo from geoinfo ";
using (OracleDataReader readerGeoInfo = cmd.ExecuteReader())
{
while (readerGeoInfo.Read())
{
GeoInfo geoInfo = new GeoInfo();
if (!readerGeoInfo.IsDBNull(0))
{
geoInfo.Id = readerGeoInfo.GetDecimal(0);
}
if (!readerGeoInfo.IsDBNull(1))
{
geoInfo.Geo = (SdoGeometry)readerGeoInfo.GetValue(1);
}
geoInfoList.Add(geoInfo);
}
readerGeoInfo.Close();
}
插入的代码为：
cmd.CommandText = " insert into geoinfo values (geoinfo_seq.nextval,:param) ";
cmd.Parameters.Clear();
OracleParameter ora