SQL Server 2008：执行尝试通过连接访问数据库的 CLR 函数时出现异常

Question

我想在 SQL Server 2008 中使用 CLR 表值函数，它从内部访问数据库。我有一个许可例外。我正在尝试以创建该函数的同一用户身份执行该函数。所以问题的原因尚不清楚..

这是函数：

public partial class MyClass
    {    
        [SqlFunction(
            DataAccess = DataAccessKind.Read,
            FillRowMethodName = "Availability_FillRow",
            TableDefinition = "B0RID nchar(32)")]
        public static IEnumerable Fn_SEARCH_Availability(SqlDateTime checkin, SqlInt32 overnights)
        {
            if (checkin.IsNull || overnights.IsNull)
            {
                return null;
            }
            List<ResultRoom> roomsResultList = new List<ResultRoom>();


        using (SqlConnection conn = new SqlConnection("Data Source=MachineName;Initial Catalog=DBNANE;Integrated Security=True"))
        {
            conn.Open();
        }
        return roomsResultList;
    }
}

这是异常

A .NET Framework error occurred during execution of user-defined routine or aggregate "Fn_SEARCH_Availability": 
System.Security.SecurityException: Request for the permission of type 'System.Data.SqlClient.SqlClientPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
System.Security.SecurityException: 
   at System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet)
   at System.Security.PermissionSet.Demand()
   at System.Data.Common.DbConnectionOptions.DemandPermission()
   at System.Data.SqlClient.SqlConnection.PermissionDemand()
   at System.Data.SqlClient.SqlConnectionFactory.PermissionDemand(DbConnection outerConnection)
   at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
   at System.Data.SqlClient.SqlConnection.Open()
   at StoredProcedures.Fn_SEARCH_Availability(SqlDateTime checkin, SqlInt32 overnights)

Answer 1

也许尝试将建立连接的 using 语句更改为

using (SqlConnection conn = new SqlConnection("context connection=true;"))

Which 告诉 CLR 使用当前的 SQL 连接。

我猜测您失败的原因是，通过指定集成安全性，它将使用 SQL Server 服务帐户的凭据。

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