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

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 { 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 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 = https://www.it610.com/article/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