I'm trying to run a query on an Oracle Database directly from my WCF service and return the result but it seems that the code that would query and return a result in a winform program is not doing the same for the wcf service. I'm getting several errors in the code from the conn.Open and cmd. saying that they are a field but used like a type ... I think I've probably got my code in the wrong place or containers so I've tried wrapping it in a class and that didn't seem to work either. What is going wrong?
[OperationContract]
CompositeType GetDataUsingDataContract(CompositeType composite);
// TODO: Add your service operations here
[OperationContract]
string oradb = "Data Source=cecc-db1;User Id=dcsi;Password=dcsi;";
OracleConnection conn = new OracleConnection(oradb); // C#
conn.Open();
OracleCommand cmd = new OracleCommand();
cmd.Connection = conn;
cmd.CommandText = "select t2.meternumber, t1.blinkdate, t1.blinkcount from (select * from cecc_processed_blinks where trunc(blinkdate) between to_date('01-may-15', 'dd-mon-yy') and to_date('08-may-15', 'dd-mon-yy')) t1 left join meteraccts t2 on t1.serialnumber = t2.serialnumber order by t1.blinkdate desc";
cmd.CommandType = CommandType.Text;
OracleDataReader dr = cmd.ExecuteReader();
dr.Read();
//TODO display the results...
conn.Dispose();
}
I believe, following is what you are looking for. To create a wcf service, first define a contract (with all operation signatures that you need) and then implement the contract with your implementations.
For more details refer to Walkthrough: Creating and Accessing WCF Services
Interface (IMyService.cs):
namespace WcfServiceLibrary
{
[ServiceContract]
public interface IMyService
{
[OperationContract]
List<string> GetMeterBlinkData();
}
}
Interface Implementation (MyService.cs):
namespace WcfServiceLibrary
{
public class MyService: IMyService
{
public List<string> GetMeterBlinkData()
{
List<string> result = new List<string>();
string oradb = "Data Source=cecc-db1;User Id=dcsi;Password=dcsi;";
OracleConnection conn = new OracleConnection(oradb); // C#
conn.Open();
OracleCommand cmd = new OracleCommand();
cmd.Connection = conn;
cmd.CommandText = "select t2.meternumber, t1.blinkdate, t1.blinkcount from (select * from cecc_processed_blinks where trunc(blinkdate) between to_date('01-may-15', 'dd-mon-yy') and to_date('08-may-15', 'dd-mon-yy')) t1 left join meteraccts t2 on t1.serialnumber = t2.serialnumber order by t1.blinkdate desc";
cmd.CommandType = CommandType.Text;
OracleDataReader dr = cmd.ExecuteReader();
dr.Read();
//TODO loop through results and fill the results object
conn.Dispose();
return result;
}
}
}
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