Question

我有一个c＃程序，想要给存储过程一个参数。我的c＃程序中的字符串就像“'食物'，'衣服'，'血'”。

ALTER PROCEDURE [dbo].[GetLocations]
    @longMax float =100,
    @longMin float=0,
    @latMax float=100,
    @latMin float=0,
    @categoryFilter char(200) = ''
AS
BEGIN
    SET NOCOUNT ON;

    SELECT *
    FROM dbo.Locations
    WHERE longitude BETWEEN @longMin AND @longMax
      AND latitude BETWEEN @latMin AND @latMax
      AND subCategory in (@categoryFilter) 
END

结果应该给我3个条目，但结果是空的。我试图用两个以上的参数来逃避参数'但结果没有改变。

它适用于其他列的int值，但不适用于chars。

如果有人可以提供帮助，那就太好了：）

Answer 1

您的结果设置为空白，因为in clause适用于数据集。而你传递的单个字符串为200个单词。您的查询实际上是在比较subCategory和categoryFilter

您可以通过提供以下设置在管理工作室中明确尝试

SELECT *
FROM dbo.Locations
WHERE longitude BETWEEN @longMin AND @longMax
AND latitude BETWEEN @latMin AND @latMax
AND subCategory in ('abc','bcd','cde');

abc-你的第一个类别过滤器，类似地bcd你的第二个，依此类推。如果您在@categoryfilter中有逗号（，）分隔的数据集，那么首先拆分该字符串，然后使用IN Clause

Answer 2

我认为您需要拆分字符串参数 -

DECLARE @categoryFilter VARCHAR(200) = 'Food,Clothes,Blood'

SELECT t.c.value('.', 'VARCHAR(50)')
FROM (
     SELECT ID = CAST ('<M>' + REPLACE(@categoryFilter, ',', '</M><M>') + '</M>' AS XML)
) r 
CROSS APPLY ID.nodes ('/M') t(c)

您的查询 -

ALTER PROCEDURE [dbo].[GetLocations] 

@longMax FLOAT = 100,
@longMin FLOAT = 0,
@latMax FLOAT = 100,
@latMin FLOAT = 0,
@categoryFilter VARCHAR(200) = 'Food,Clothes,Blood'

AS
BEGIN
     SET NOCOUNT ON;

     SELECT *
     FROM dbo.Locations
     WHERE longitude BETWEEN @longMin AND @longMax
          AND latitude BETWEEN @latMin AND @latMax
          AND (
               @categoryFilter = '' 
               OR 
               subCategory IN (
                    SELECT t.c.value('.', 'VARCHAR(50)')
                    FROM (
                         SELECT ID = CAST ('<M>' + REPLACE(@categoryFilter, ',', '</M><M>') + '</M>' AS XML)
                    ) r 
                    CROSS APPLY ID.nodes ('/M') t(c))
          )

END

Answer 3

试试这个

ALTER PROCEDURE [dbo].[GetLocations]
@longMax float =100,
@longMin float=0,
@latMax float=100,
@latMin float=0,
@categoryFilter char(200) = ''
AS
BEGIN
    SET NOCOUNT ON;
   SET @categoryFilter =  REPLACE(@categoryFilter,',',''',''')

   DECLARE @QUERY VARCHAR(MAX)
   SET @QUERY = 'SELECT *
    FROM dbo.Locations
    WHERE longitude BETWEEN @longMin AND @longMax
      AND latitude BETWEEN @latMin AND @latMax
      AND subCategory in ('''+RTRIM(@categoryFilter)+''')'

    --PRINT (@QUERY) 

    EXEC (@QUERY) 


END

Answer 4

你可以使用LIKE：

ALTER PROCEDURE [dbo].[GetLocations]
    @longMax float =100,
    @longMin float=0,
    @latMax float=100,
    @latMin float=0,
    @categoryFilter char(200) = ''
AS
BEGIN
    SET NOCOUNT ON;

    SELECT *
    FROM dbo.Locations
    WHERE longitude BETWEEN @longMin AND @longMax
      AND latitude BETWEEN @latMin AND @latMax
      AND @categoryFilter LIKE '%' + subCategory + '%'
END

Answer 5

尝试修剪您的传入字符串 - ＆gt; RTRIM（@string）。

如果你正在使用char，你总是需要修剪。

Answer 6

你可以尝试如下

ALTER PROCEDURE [dbo].[GetLocations]
    @longMax float =100,
    @longMin float=0,
    @latMax float=100,
    @latMin float=0,
    @categoryFilter char(200) = '',
    @Query varchar(2000)

AS
BEGIN
    SET NOCOUNT ON;

    Set @Query = 'SELECT *
            FROM dbo.Locations
           WHERE longitude BETWEEN @longMin AND @longMax
                  AND latitude BETWEEN @latMin AND @latMax
                  AND @categoryFilter IN (' + LTRIM(RTRIM(@categoryFilter)) + ')' 

    Exec(@Query)

END

SQL存储过程IN子句varchar数组

6 个答案: