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我从一个asp.net webform将参数传递给存储过程。MS SQL存储过程返回基于空白参数的意外结果
但是,对于一个特定的参数组合,单个参数似乎被忽略。
我传递的参数是导致该问题如下:
EXEC @return_value = [dbo].[spProgressCohorts]
@StuYear = N'10',
@DataCollection = N'March 2013 Teacher Assessments',
@SubjectName = N'English',
@TeachingGroup = N'Select All',
@Subgroup = N'Select All',
@KS2 = '',
@Result = ''
当我运行这些参数的结果返回好像@Result变量被忽略的存储过程。
结果的存储过程返回的(在ks2en和结果列都包含供参考):
surname forename ks2en result
El Hajj Zeinab D
Grzelak Marlena F+
Sage Nigel
但是,我得到的只是得到奈杰尔贤者记录(如预期,这是应该由被退回存储过程)时,当我运行以下查询:
select surname, forename, ks2en, result
from student join subject on subject.upn=student.upn
where datacollection='March 2013 Teacher Assessments' and stuyear='10' and name='english' and result='' and ks2en=''
我的存储过程是巨大的,所以我就包括具体到上面的参数代码:
ALTER PROCEDURE [dbo].[spProgressCohorts]
@StuYear varchar(2),
@DataCollection varchar(100),
@SubjectName varchar(100),
@TeachingGroup varchar(30),
@Subgroup varchar(10),
@Result varchar(4),
@KS2 varchar(4)
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
--interfering with SELECT statements.
SET NOCOUNT ON;
SELECT Forename + ' ' + Surname
FROM student
JOIN subject
ON subject.upn = student.upn
WHERE
(@StuYear = [stuyear]
AND @TeachingGroup = 'Select All'
AND [DataCollection] = @DataCollection
AND [Name] = @SubjectName
AND @Subgroup='Select All'
AND @KS2 = CASE @subjectName WHEN 'English' THEN KS2en WHEN 'Mathematics' THEN KS2ma ELSE KS2av END
AND [Result] like @Result + '%')
OR
(@StuYear = [stuyear]
AND @TeachingGroup Not Like 'Select All'
AND [DataCollection] = @DataCollection
AND [Name] = @SubjectName
AND [TeachingGroup] = @TeachingGroup
AND @Subgroup='Select All'
AND @KS2 = CASE @subjectName WHEN 'English' THEN KS2en WHEN 'Mathematics' THEN KS2ma ELSE KS2av END
AND [Result] like @Result + '%')
ORDER BY surname, forename
它完全按照预期工作。如果您想要完全匹配,请在存储过程中使用'='。像'%''将匹配所有的'NOT NULL'值。 –
感谢@MartinSmith。问题是我需要它来搜索像结果这样的值,因为如果我有一个从webform传递的参数,它将是一个完整的等级,例如A,B,C等,结果列中的结果可以具有+或 - 值例如A +,A,A-,B +,B,B-等等。有没有办法编辑我的where语句,以便分别处理'@result ='''和'@ ks2 ='''的情况? – Matt