使用C#操作Oracle Spatial的SDO_GEOMETRY对像（读取和写入）

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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://pan.baidu.com/s/1dDquLhv
或
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<SdoGeometry>  {    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<decimal> {}    [OracleCustomTypeMappingAttribute("MDSYS.SDO_ORDINATE_ARRAY")]    public class OrdinatesArrayFactory : OracleArrayTypeFactoryBase<decimal> {}    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<decimal?>((int)OracleObjectColumns.SDO_GTYPE);      Sdo_Srid = GetValue<decimal?>((int)OracleObjectColumns.SDO_SRID);      Point = GetValue<SdoPoint>((int)OracleObjectColumns.SDO_POINT);      ElemArray = GetValue<decimal[]>((int)OracleObjectColumns.SDO_ELEM_INFO);      OrdinatesArray = GetValue<decimal[]>((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 oracleParameterGeo = new OracleParameter();          oracleParameterGeo.OracleDbType = OracleDbType.Object;          oracleParameterGeo.UdtTypeName = "MDSYS.SDO_GEOMETRY";          cmd.Parameters.Add(oracleParameterGeo);          //creating point          SdoGeometry geoPoint = new SdoGeometry();          geoPoint.Sdo_Gtype = 2001;           geoPoint.Point = new SdoPoint();          geoPoint.Point.X = 200;          geoPoint.Point.Y = 400;          oracleParameterGeo.Value = geoPoint;          //insert point in table geoinfo          cmd.ExecuteNonQuery();          //creating polygon          SdoGeometry geoPolygon = new SdoGeometry();          geoPolygon.Sdo_Gtype = 2003;          geoPolygon.ElemArray = new decimal[] { 1, 1003, 1 };          geoPolygon.OrdinatesArray = new decimal[] { 3, 3, 3, 10, 10, 10, 10, 3, 3, 3 };          oracleParameterGeo.Value = geoPolygon;           //insert polygon into table geoinfo           cmd.ExecuteNonQuery();

在实际使用中，使用DataAdapter的Fill方法将Select *的查询结果放到DataTable中时，如果已经定义了SdoGeometry的类，查询结果会自动地将DataTable的那列认为是SdoGeometry，非常方便，例如

OracleDataAdapter mAdp = new OracleDataAdapter("select * from geoinfo", con);

DataTable mDst = new DataTable();

mAdp.Fill(mDst);

此时mDst的第二列数据类型即为SdoGeometry

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