[英]SQL in (@Variable) query
I have the following code, the problem is that my variable list @LocationList is essentially a csv string. 我有以下代码,问题是我的变量列表@LocationList本质上是一个csv字符串。 When I use this as part of the where LocationID in (@LocationList) it says its not an int (LocationID is an int).
当我使用它作为(@LocationList)中LocationID的一部分时,它表示它不是一个int(LocationID是一个int)。 How can I get this csv string to be accepted by teh in clause?
如何让这个csv字符串被teh in子句接受?
Declare @LocationList varchar(1000)
Set @LocationList = '1,32'
select Locations from table where Where LocationID in (@LocationList)
The most efficient way to do this is with Dynamic SQL such as rt2800 mentions (with injection warnings by Michael Allen) 最有效的方法是使用动态SQL,例如rt2800提及(由迈克尔艾伦注射警告)
However you can make a function: 但是你可以做一个功能:
ALTER FUNCTION [dbo].[CSVStringsToTable_fn] ( @array VARCHAR(8000) )
RETURNS @Table TABLE ( value VARCHAR(100) )
AS
BEGIN
DECLARE @separator_position INTEGER,
@array_value VARCHAR(8000)
SET @array = @array + ','
WHILE PATINDEX('%,%', @array) <> 0
BEGIN
SELECT @separator_position = PATINDEX('%,%', @array)
SELECT @array_value = LEFT(@array, @separator_position - 1)
INSERT @Table
VALUES ( @array_value )
SELECT @array = STUFF(@array, 1, @separator_position, '')
END
RETURN
END
and select from it: 并从中选择:
DECLARE @LocationList VARCHAR(1000)
SET @LocationList = '1,32'
SELECT Locations
FROM table
WHERE LocationID IN ( SELECT *
FROM dbo.CSVStringsToTable_fn(@LocationList) )
OR 要么
SELECT Locations
FROM table loc
INNER JOIN dbo.CSVStringsToTable_fn(@LocationList) list
ON list.value = loc.LocationID
Which is extremely helpful when you attempt to send a multi-value list from SSRS to a PROC. 当您尝试从SSRS向PROC发送多值列表时,这非常有用。
I often have this requirement, and SOMETIME , if you know very well the column you are searching on [the size/format/length], you can do a kind of REGEX. 我经常有这个要求, 有时 ,如果你很清楚你正在搜索的列[大小/格式/长度],你可以做一种REGEX。
Something like this : 像这样的东西:
DECLARE @MyListOfLocation varchar(255)
set @MyListOfLocation = '|1|32|36|24|3|'
Select LocationID
from Table
where @MyListOfLocation like '%|' + LocationID + '|%'
NOTE : the PIPE character is used to protect the query from returning any LocationID that contains a single character (the '1', for example). 注意 :PIPE字符用于保护查询不返回任何包含单个字符的LocationID(例如,“1”)。
Here is a complete working example : 这是一个完整的工作示例:
DECLARE @MyListOfLocation varchar(255)
set @MyListOfLocation = '|1|11|21|'
SELECT LocationName
FROM (
select '1' as LocationID, 'My Location 1' as LocationName
union all
select '11' as LocationID, 'My Location 11' as LocationName
union all
select '12' as LocationID, 'My Location 12' as LocationName
union all
select '13' as LocationID, 'My Location 13' as LocationName
union all
select '21' as LocationID, 'My Location 21' as LocationName
) as MySub
where @MyListOfLocation like '%|' + LocationID + '|%'
WARNING! 警告! This method is not Index friendly!
这种方法不友好!
If you want do add some IN(@MyListOfLocation) in all that, to leverage use of INDEXES, you can modify your script do to : 如果你想在所有这些中添加一些IN(@MyListOfLocation),为了利用INDEXES的使用,你可以修改你的脚本做到:
SELECT MyDATA.*
FROM HugeTableWithAnIndexOnLocationID as MyDATA
WHERE LocationID in (
Select LocationID
from Table
where @MyListOfLocation like '%|' + LocationID + '|%')
declare @querytext Nvarchar(MAX)
set @querytext = 'select Locations from table where Where LocationID in (' + @LocationList + ');';
exec sp_executesql @querytext;
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