Question

我有一个存储过程，它返回一组多个结果（两个表）。我这样调用存储过程：

var result = context.Database.SqlQuery<RefererStatisticResult>(
"exec [dbo].[GetReferrer] @StartDate, @EndDate, @Source",
this.CreateInParam("@StartDate", SqlDbType.DateTime, startDate),
this.CreateInParam("@EndDate", SqlDbType.DateTime, endDate),
this.CreateInParam("@Source", SqlDbType.SmallInt, eventSourveVal)).ToArray();

My RefererStatisticResult包含两个List＆lt;＆gt;属性，用于结果集，但调用后列表为空。我该如何处理结果集？是否可以使用SqlQuery？

Answer 1

DbContext没有本机支持实现多个结果集。但是，通过下拉到ObjectContext并使用Translate方法将DbDataReader的结果复制到域模型中的实体，可以合理地直接实现。

这是一些示例代码。这假设您的ReferrerStatisticResult只是名为Set1和Set2的两个列表的容器。显然可以根据您的实际域模型进行调整。

// Create container ready for the resultsets
var result = new RefererStatisticResult();

using (var myContext = new MyContext())
{
    // Create command from the context in order to execute
    // the `GetReferrer` proc
    var command = myContext.Database.Connection.CreateCommand();
    command.CommandType = System.Data.CommandType.StoredProcedure;
    command.CommandText = "[dbo].[GetReferrer]";
    // add in command parameters
    // (not shown)

    try
    {
        myContext.Connection.Open();
        var reader = command.ExecuteReader();

        // Drop down to the wrapped `ObjectContext` to get access to
        // the `Translate` method
        var objectContext = ((IObjectContextAdapter)myContext).ObjectContext;

        // Read Entity1 from the first resultset
        result.Set1 = objectContext.Translate<Entity1>(reader, "Set1", MergeOptions.AppendOnly);

        // Read Entity2 from the second resultset
        reader.NextResult();
        result.Set2 = objectContext.Translate<Entity2>(reader, "Set2", MergeOptions.AppendOnly);        
    }
    finally
    {
        myContext.Database.Connection.Close();
    }
}

Answer 2

我认为以下代码可以为您提供帮助。

 MultiResultDomain domainEntity = new MultiResultDomain();
     var command = _DatabaseContext.Database.Connection.CreateCommand();
     command.CommandText = "[dbo].[SPR_GETMultipleResultSP]";
     command.CommandType = CommandType.StoredProcedure;
     try
     {
         _DatabaseContext.Database.Connection.Open();
         var reader = command.ExecuteReader();

     List<customcustomer> _listOfCustomer =
     ((IObjectContextAdapter)_DatabaseContext).ObjectContext.Translate<customcustomer>
     (reader).ToList();
         reader.NextResult();
         List<customproduct> _listOfProduct =
             ((IObjectContextAdapter)_DatabaseContext).ObjectContext.Translate<customproduct>
     (reader).ToList();

         foreach (var cust in _listOfCustomer)
         {
             Console.WriteLine("Name: Mr.{0} And Country: {1}", cust.FirstName,
             cust.Country);
         }

         foreach (var product in _listOfProduct)
         {
             Console.WriteLine("ProductName: {0} And Package: {1}",
             product.ProductName, product.Package);
         }

         domainEntity.Customer = _listOfCustomer;
         domainEntity.Product = _listOfProduct;
         return domainEntity;

参考：Click here

使用SqlQuery处理存储过程的多个结果

2 个答案: