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
ODAC使用方法参考:http://blog.csdn.net/rrrrssss00/article/details/7178515
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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