Question

我希望返回@from和@to之间的数据。 DB中的日期是nvarchar（max）类型。 Sql很好，因为当我设置@from和@to并在sql server中运行sql代码时，返回正确的结果。 XML不为空，有列名，但不是列数据。

public static DataSet Report(string from, string to)
{
    DataSet ds = new DataSet("Rez");
    using (SqlConnection conn = new SqlConnection(conf.ConnStrVienaSas))
    {
        using (SqlCommand cmd = new SqlCommand(FileReaderHelper.ReadSQLText("ExternalReports.sql"), conn))
        {
            cmd.CommandType = CommandType.Text;
            cmd.CommandTimeout = 180;
            cmd.Parameters.Add("@from", SqlDbType.NVarChar).Value = from;
            cmd.Parameters.Add("@to", SqlDbType.NVarChar).Value = to; 
            using (SqlDataAdapter adap = new SqlDataAdapter(cmd))
            try
            {
                adap.Fill(ds);
            }
            catch (Exception ex)
            {
                ds = WSErrorExtenderHelper.CreateErrorDS(ex.ToString() /*"Error reading data from DB."*/);
            }
        }
    }
    return ds;
}

SQL片段：

SELECT [A].[FieldValue] AS Created_at, [B].[Created_by], [C].[Code1], 
[D].[Code2], [E].[Code3], [F].[Code4]
FROM [dbo].[TEMP] A with (nolock)
INNER JOIN [dbo].[TEMP2] B with (nolock)
ON [A].[UserDefinedRowId] = [B].[UserDefinedRowId]
INNER JOIN [dbo].[TEMP3] C with (nolock)
ON [A].[UserDefinedRowId] = [C].[UserDefinedRowId]
INNER JOIN [dbo].[TEMP4] D with (nolock)
ON [A].[UserDefinedRowId] = [D].[UserDefinedRowId]
INNER JOIN [dbo].[TEMP5] E with (nolock)
ON [A].[UserDefinedRowId] = [E].[UserDefinedRowId]
INNER JOIN [dbo].[TEMP6] F with (nolock)
ON [A].[UserDefinedRowId] = [F].[UserDefinedRowId]

WHERE ([A].[FieldValue] between @from and @to)

Answer 1

我相信使用：

conn.Open();

将解决您的问题

SQL不返回数据

1 个答案: