Question

我能够返回表查询以及rowcount吗？我想返回我的表，但我也想通知用户我的存储过程是否没有返回任何内容。

这是我到目前为止所做的：

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[pwp_getCouponRedemption]
(
    @couponCode varchar(max)
)
AS
SELECT CouponCode, CouponValue
FROM pwpCouponCodes cc
WHERE cc.CouponCode = @couponCode
ORDER BY cc.CouponCode

这是我的asp代码：

        SqlConnection conn;
        SqlCommand comm;
        SqlDataReader reader;
        string connectionString = ConfigurationManager.ConnectionStrings["SiteSqlServer"].ConnectionString;
        conn = new SqlConnection(connectionString);
        comm = new SqlCommand("pwp_getCouponRedemption", conn);
        comm.CommandType = CommandType.StoredProcedure;
        comm.Parameters.Add("@couponCode", SqlDbType.VarChar);
        comm.Parameters["@couponCode"].Value = couponCode;

        try
        {
            conn.Open();
            reader = comm.ExecuteReader();
            while (reader.Read())
            {
                sqlCouponCode =  reader[0].ToString();
                sqlCouponValue = float.Parse(reader[1].ToString());
            }
         } 
         blah blah catch final code...

我对这一切都很陌生，所以任何帮助都会非常感激。谢谢！

Answer 1

你可以这样做：

首先将存储过程更改为

ALTER PROCEDURE [dbo].[pwp_getCouponRedemption]
(
    @couponCode varchar(max)
)
AS

-- This is the first result returned by your SqlDataReader
SELECT COUNT(*)
FROM pwpCouponCodes cc
WHERE cc.CouponCode = @couponCode
ORDER BY cc.CouponCode

-- This is the second result available if the call to NextResult() returns true
SELECT CouponCode, CouponValue
FROM pwpCouponCodes cc
WHERE cc.CouponCode = @couponCode
ORDER BY cc.CouponCode

现在将您的调用代码更改为此类

string connectionString = ConfigurationManager.ConnectionStrings["SiteSqlServer"].ConnectionString;
using(SqlConnection conn = new SqlConnection(connectionString))
using(SqlCommand comm = new SqlCommand("pwp_getCouponRedemption", conn))
{
    comm.CommandType = CommandType.StoredProcedure;
    comm.Parameters.Add("@couponCode", SqlDbType.VarChar);
    comm.Parameters["@couponCode"].Value = couponCode;

    try
    {
        conn.Open();
        using(SqlDataReader reader = comm.ExecuteReader())
        {
            if (reader.Read())
            {
               int countRecord = Convert.ToInt32(reader[0]);
               if (reader.NextResult())
               {
                   while (reader.Read())
                   {
                      sqlCouponCode =  reader[0].ToString();
                      sqlCouponValue = float.Parse(reader[1].ToString());
                   }
                } 
            }
        }
    }
}

Answer 2

将存储过程更改为：

PROCEDURE [dbo].[pwp_getCouponRedemption]
(
    @couponCode varchar(max)
)
AS
SELECT CouponCode, CouponValue, 1 AS FoundACouponForYou
FROM pwpCouponCodes cc
WHERE cc.CouponCode = @couponCode
ORDER BY cc.CouponCode;

将您的C＃代码更改为：

    try
    {
        bool foundACouponCode = false;
        conn.Open();
        using(reader = comm.ExecuteReader())
        {
            if (reader.Read())
            {
               int countRecord = Convert.ToInt32(reader(0));
               if (reader.NextResult())
               {
                   while (reader.Read())
                   {
                      sqlCouponCode =  reader[0].ToString();
                      sqlCouponValue = float.Parse(reader[1].ToString());
                      foundACouponCode = reader[2].ToString() == "1";
                   }
                } 
            }
            if (!foundACouponCode)
                MessageBox.Show("Failed to find a coupon code!");
        }
    }

TBH你甚至不需要改变你的存储过程如果你不想，你可以将foundACouponCode设置为true，如果它通过那段代码，因为它只会到那里有优惠券代码。

Answer 3

如果您只是想知道存储过程是否返回行，您可以在

上进行测试

var zeroRows = reader.HasRows ? "Yes" : "No";

Answer 4

或者你可以在循环结束后检查sqlCouponCode。它只是在循环内部设置。

if(sqlCouponCode != null)
{
    //There are no rows...do something
}

存储过程返回查询和rowcount

4 个答案: