Question

！[在此处输入图像说明] [1]我已经获得了最新的Mysql连接器，允许您使用asp.net webapi来使用Visual Studio Entity Framework设计器。并使用以下代码调用商店程序

 public static class Class1 
{
    public static List<T> ExecuteStoredProcedure<T>(this DbContext dbContext, string storedProcedureName,List<object> parameters)
    {
        string storedProcedureCommand = "CALL " + storedProcedureName + "(";

        List<object> augmentedParameters = parameters.ToList();

        storedProcedureCommand = AddParametersToCommand(storedProcedureCommand, augmentedParameters);

        storedProcedureCommand += ");";

        return dbContext.Database.SqlQuery<T>(storedProcedureCommand).ToList<T>();

    }

    public static List<T> ExecuteStoredRecursiveProcedure<T>(this DbContext dbContext, string storedProcedureName, params object[] parameters)
    {
        string storedProcedureCommand = "SET max_sp_recursion_depth = " + maxRecursionCount + "; CALL " + storedProcedureName + "(";

        List<object> augmentedParameters = parameters.ToList();

        storedProcedureCommand = AddParametersToCommand(storedProcedureCommand, augmentedParameters);

        storedProcedureCommand += ");";

        return dbContext.Database.SqlQuery<T>(storedProcedureCommand).ToList<T>();
    }

    private static string AddParametersToCommand(string storedProcedureCommand, List<object> augmentedParameters)
    {
        for (int i = 0; i < augmentedParameters.Count(); i++)
        {
            storedProcedureCommand = AddParameterToCommand(storedProcedureCommand, augmentedParameters, i);
        }
        return storedProcedureCommand;
    }
    private static string AddParameterToCommand(string storedProcedureCommand, List<object> augmentedParameters, int i)
    {
        if (augmentedParameters[i].GetType() == typeof(string))
        {
            storedProcedureCommand += "'";
        }

        storedProcedureCommand += (augmentedParameters[i].ToString());

        if (augmentedParameters[i].GetType() == typeof(string))
        {
            storedProcedureCommand += "'";
        }

        if (i < augmentedParameters.Count - 1)
        {
            storedProcedureCommand += ",";
        }

        return storedProcedureCommand;
    }

    public static string maxRecursionCount { get; set; }
}

这里我用零参数调用ExecuteStoredProcedure方法但是它会导致上述错误＆＃34;数据读取器有多个字段。多个字段对EDM原语或枚举类型无效。＆＃34;

  public List<decimal> Getcollection()
    {
     List<object> listobj=new List<object>();
         var x=  db.ExecuteStoredProcedure<decimal>("MangerModule",listobj);

         var list = x.ToList();
         return list;
        //collection collection = db.collections.Find(id);
        //if (collection == null)
        //{
        //    throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.NotFound));
        //}

        //return collection;
    }

Answer 1

我使用下面的代码来解决我的问题：

     public virtual List<columns> Getcollection()
    {
        string SQLQuery = "call MangerModule();";
        var objectContext = ((IObjectContextAdapter)db).ObjectContext;
        List<object> listobj = new List<object>();
        List<columns> data = objectContext.ExecuteStoreQuery<columns>(SQLQuery).AsQueryable().ToList();
        return data;
    }

数据阅读器有多个字段。多个字段对EDM原语或枚举类型无效

1 个答案: