Question

我试图直接从我的WCF服务在Oracle数据库上运行查询并返回结果，但似乎在winform程序中查询并返回结果的代码对于wcf服务。 我在conn.Open和cmd的代码中遇到了几个错误。说他们是一个领域但是像一个类型一样使用 ...我想我可能把我的代码放在了错误的地方或容器中，所以我尝试将它包装在一个类中并且没有＆似乎也可以工作。出了什么问题？

    [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();
}

Answer 1

我相信，以下是您正在寻找的。要创建wcf服务，首先要定义一个合同（包含您需要的所有操作签名），然后与您的实现实现合同。

有关详细信息，请参阅Walkthrough: Creating and Accessing WCF Services

接口（IMyService.cs）：

namespace WcfServiceLibrary
{  
    [ServiceContract]
    public interface IMyService
    {
        [OperationContract]
        List<string> GetMeterBlinkData();
    }
}

接口实现（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;
        }
    }
}

在WCF服务中运行Oracle Query

1 个答案: