ServiceStack OrmlLite从存储过程中获取标量输出

Question

如何从存储过程中获取标量输出？当我执行以下语句时，它返回DBNull。

我们正在使用ServiceStack.OrmLite 4.5.8

var le = db.<<SP Name>>(param1, param2)
                .TryGetParameterValue("output_id", out object val);

OrmLite T4模板生成以下代码：

public static OrmLiteSPStatement SPName(this IDbConnection db, string @Param1 = null, string @Param2 = null, @Output_id = null)
{
    var dbCmd = (DbCommand)OrmLiteConfig.ExecFilter.CreateCommand(db).ToDbCommand();
    dbCmd.CommandText = "SP NAME";
    dbCmd.CommandType = CommandType.StoredProcedure;
    dbCmd.Parameters.Add(CreateNewParameter(dbCmd,"Param1",@param1,ParameterDirection.Input,DbType.AnsiString));
    dbCmd.Parameters.Add(CreateNewParameter(dbCmd,"Param2",@param2,ParameterDirection.Input,DbType.AnsiString));        
    dbCmd.Parameters.Add(CreateNewParameter(dbCmd,"Output_id",@output_id,ParameterDirection.InputOutput,DbType.Int32));
    dbCmd.Parameters.Add(CreateNewParameter(dbCmd,"__ReturnValue",0,ParameterDirection.ReturnValue,DbType.Int32));
    return new OrmLiteSPStatement(db, dbCmd);
}

由于 rudrvij

Answer 1

var result = db.Scalar<int>("EXEC [SP Name] @param1, @param2", new { param1 = "value1", param2 = "value2" });