如何在C＃中显示SQL“PRINT”命令的输出？

我有一个总是返回“PRINT”命令的SQL过程，我想提取这个“PRINT”命令的输出，即C＃中的过程我该怎么做？ 这是程序

ALTER PROC ResultsPoll @pollid INT AS DECLARE @count1 INT DECLARE @count2 INT DECLARE @count3 INT DECLARE @count4 INT DECLARE @count5 INT DECLARE @test VARCHAR(MAX) DECLARE @value VARCHAR(MAX) SELECT @count1 = COUNT(mem_id) FROM Students_answer_Polls INNER JOIN Polls ON Polls.poll_id = Students_answer_Polls.poll_id WHERE Students_answer_Polls.poll_id = @pollid AND Students_answer_Polls.answer = Polls.a1 SELECT @count2 = COUNT(mem_id) FROM Students_answer_Polls INNER JOIN Polls ON Polls.poll_id = Students_answer_Polls.poll_id WHERE Students_answer_Polls.poll_id = @pollid AND Students_answer_Polls.answer = Polls.a2 SELECT @count3 = COUNT(mem_id) FROM Students_answer_Polls INNER JOIN Polls ON Polls.poll_id = Students_answer_Polls.poll_id WHERE Students_answer_Polls.poll_id = @pollid AND Students_answer_Polls.answer = Polls.a3 SELECT @count4 = COUNT(mem_id) FROM Students_answer_Polls INNER JOIN Polls ON Polls.poll_id = Students_answer_Polls.poll_id WHERE Students_answer_Polls.poll_id = @pollid AND Students_answer_Polls.answer = Polls.a4 SELECT @count5 = COUNT(mem_id) FROM Students_answer_Polls INNER JOIN Polls ON Polls.poll_id = Students_answer_Polls.poll_id WHERE Students_answer_Polls.poll_id = @pollid AND Students_answer_Polls.answer = Polls.a5 SELECT @test=Polls.a1 FROM Polls WHERE poll_id = @pollid IF(@test IS NOT NULL) BEGIN PRINT ('Number of students who chose '+@test+' is:'+' '+CAST (@count1 AS VARCHAR(MAX))) END SELECT @test=Polls.a2 FROM Polls WHERE poll_id = @pollid IF(@test IS NOT NULL) BEGIN PRINT ('Number of students who chose '+@test+' is:'+' '+CAST (@count2 AS VARCHAR(MAX))) END SELECT @test=Polls.a3 FROM Polls WHERE poll_id = @pollid IF(@test IS NOT NULL) BEGIN PRINT ('Number of students who chose '+@test+' is:'+' '+CAST (@count3 AS VARCHAR(MAX))) END SELECT @test=Polls.a4 FROM Polls WHERE poll_id = @pollid IF(@test IS NOT NULL) BEGIN PRINT ('Number of students who chose '+@test+' is:'+' '+CAST (@count4 AS VARCHAR(MAX))) END SELECT @test=Polls.a5 FROM Polls WHERE poll_id = @pollid IF(@test IS NOT NULL) BEGIN PRINT ('Number of students who chose '+@test+' is:'+' '+CAST (@count5 AS VARCHAR(MAX))) END 

Answer 1

您需要订阅SqlConnection.InfoMessage事件。

MSDN 在这里有一些示例代码。

Answer 2

正确的方法是将值记录在输出参数中，然后在存储过程中打印输出参数值。

例如：

 ALTER PROC ResultsPoll @pollid INT , @message varchar(max) OUTPUT AS SET @message = '' ... IF(@test IS NOT NULL) BEGIN SET @message = 'Number of students who chose '+@test+' is:'+' '+CAST (@count1 AS VARCHAR(MAX)) END ... PRINT(@message) 

然后，在您的代码中，检索输出参数的值。

更新

只有在返回单个状态或错误消息时，上述建议才有效。 仔细检查存储过程后，我意识到这不是这个存储过程的情况，因为print语句用于将数据返回给调用应用程序。

既然我理解了这一点，我建议如果可能的话，重写存储过程如下：

 ALTER PROC ResultsPoll @pollid INT AS SELECT result = 'Number of students who chose ' + MAX(Polls.a1) + ' is: ' + CAST(COUNT(1) AS NVARCHAR(MAX)) FROM Students_answer_Polls INNER JOIN Polls ON Polls.poll_id = Students_answer_Polls.poll_id WHERE Students_answer_Polls.poll_id = @pollid AND Students_answer_Polls.answer = Polls.a1 UNION SELECT result = 'Number of students who chose ' + MAX(Polls.a2) + ' is: ' + CAST(COUNT(1) AS NVARCHAR(MAX)) FROM Students_answer_Polls INNER JOIN Polls ON Polls.poll_id = Students_answer_Polls.poll_id WHERE Students_answer_Polls.poll_id = @pollid AND Students_answer_Polls.answer = Polls.a2 UNION SELECT result = 'Number of students who chose ' + MAX(Polls.a3) + ' is: ' + CAST(COUNT(1) AS NVARCHAR(MAX)) FROM Students_answer_Polls INNER JOIN Polls ON Polls.poll_id = Students_answer_Polls.poll_id WHERE Students_answer_Polls.poll_id = @pollid AND Students_answer_Polls.answer = Polls.a3 UNION SELECT result = 'Number of students who chose ' + MAX(Polls.a4) + ' is: ' + CAST(COUNT(1) AS NVARCHAR(MAX)) FROM Students_answer_Polls INNER JOIN Polls ON Polls.poll_id = Students_answer_Polls.poll_id WHERE Students_answer_Polls.poll_id = @pollid AND Students_answer_Polls.answer = Polls.a4 UNION SELECT result = 'Number of students who chose ' + MAX(Polls.a5) + ' is: ' + CAST(COUNT(1) AS NVARCHAR(MAX)) FROM Students_answer_Polls INNER JOIN Polls ON Polls.poll_id = Students_answer_Polls.poll_id WHERE Students_answer_Polls.poll_id = @pollid AND Students_answer_Polls.answer = Polls.a5 

有了这个，您可以只处理返回的行，这些行将包含一个名为result的列。