我试图调试别人的SQL报表，并已将底层报表查询放入SQL 2012的查询窗口。
报告要求的参数之一是一个整数列表。这是通过一个多选下拉框在报表上实现的。报告的底层查询在where子句中使用这个整数列表。
select *
from TabA
where TabA.ID in (@listOfIDs)
我不想修改我正在调试的查询，但我不知道如何在SQL Server上创建一个变量，可以保存这种类型的数据来测试它。
如。
declare @listOfIDs int
set listOfIDs = 1,2,3,4
没有可以保存整数列表的数据类型，因此如何在SQL Server上使用与报表相同的值运行报表查询?
当前回答
对于SQL Server 2016+和Azure SQL数据库，添加了STRING_SPLIT函数，这将是这个问题的完美解决方案。以下是文档: https://learn.microsoft.com/en-us/sql/t-sql/functions/string-split-transact-sql
这里有一个例子:
/*List of ids in a comma delimited string
Note: the ') WAITFOR DELAY ''00:00:02''' is a way to verify that your script
doesn't allow for SQL injection*/
DECLARE @listOfIds VARCHAR(MAX) = '1,3,a,10.1,) WAITFOR DELAY ''00:00:02''';
--Make sure the temp table was dropped before trying to create it
IF OBJECT_ID('tempdb..#MyTable') IS NOT NULL DROP TABLE #MyTable;
--Create example reference table
CREATE TABLE #MyTable
([Id] INT NOT NULL);
--Populate the reference table
DECLARE @i INT = 1;
WHILE(@i <= 10)
BEGIN
INSERT INTO #MyTable
SELECT @i;
SET @i = @i + 1;
END
/*Find all the values
Note: I silently ignore the values that are not integers*/
SELECT t.[Id]
FROM #MyTable as t
INNER JOIN
(SELECT value as [Id]
FROM STRING_SPLIT(@listOfIds, ',')
WHERE ISNUMERIC(value) = 1 /*Make sure it is numeric*/
AND ROUND(value,0) = value /*Make sure it is an integer*/) as ids
ON t.[Id] = ids.[Id];
--Clean-up
DROP TABLE #MyTable;
查询结果为1,3
其他回答
您不能这样做，但可以执行将其存储在变量中的整个查询。
例如:
DECLARE @listOfIDs NVARCHAR(MAX) =
'1,2,3'
DECLARE @query NVARCHAR(MAX) =
'Select *
From TabA
Where TabA.ID in (' + @listOfIDs + ')'
Exec (@query)
表变量
declare @listOfIDs table (id int);
insert @listOfIDs(id) values(1),(2),(3);
select *
from TabA
where TabA.ID in (select id from @listOfIDs)
or
declare @listOfIDs varchar(1000);
SET @listOfIDs = ',1,2,3,'; --in this solution need put coma on begin and end
select *
from TabA
where charindex(',' + CAST(TabA.ID as nvarchar(20)) + ',', @listOfIDs) > 0
对于SQL Server 2016+和Azure SQL数据库，添加了STRING_SPLIT函数，这将是这个问题的完美解决方案。以下是文档: https://learn.microsoft.com/en-us/sql/t-sql/functions/string-split-transact-sql
这里有一个例子:
/*List of ids in a comma delimited string
Note: the ') WAITFOR DELAY ''00:00:02''' is a way to verify that your script
doesn't allow for SQL injection*/
DECLARE @listOfIds VARCHAR(MAX) = '1,3,a,10.1,) WAITFOR DELAY ''00:00:02''';
--Make sure the temp table was dropped before trying to create it
IF OBJECT_ID('tempdb..#MyTable') IS NOT NULL DROP TABLE #MyTable;
--Create example reference table
CREATE TABLE #MyTable
([Id] INT NOT NULL);
--Populate the reference table
DECLARE @i INT = 1;
WHILE(@i <= 10)
BEGIN
INSERT INTO #MyTable
SELECT @i;
SET @i = @i + 1;
END
/*Find all the values
Note: I silently ignore the values that are not integers*/
SELECT t.[Id]
FROM #MyTable as t
INNER JOIN
(SELECT value as [Id]
FROM STRING_SPLIT(@listOfIds, ',')
WHERE ISNUMERIC(value) = 1 /*Make sure it is numeric*/
AND ROUND(value,0) = value /*Make sure it is an integer*/) as ids
ON t.[Id] = ids.[Id];
--Clean-up
DROP TABLE #MyTable;
查询结果为1,3
我用这个:
1-在构建的脚本中声明一个临时表变量:
DECLARE @ShiftPeriodList TABLE(id INT NOT NULL);
分配给临时表:
IF (SOME CONDITION)
BEGIN
INSERT INTO @ShiftPeriodList SELECT ShiftId FROM [hr].[tbl_WorkShift]
END
IF (SOME CONDITION2)
BEGIN
INSERT INTO @ShiftPeriodList
SELECT ws.ShiftId
FROM [hr].[tbl_WorkShift] ws
WHERE ws.WorkShift = 'Weekend(VSD)' OR ws.WorkShift = 'Weekend(SDL)'
END
在WHERE语句中引用表:
INSERT INTO SomeTable WHERE ShiftPeriod IN (SELECT * FROM @ShiftPeriodList)
最后我得出的结论是，如果不修改查询的工作方式，我就不能将值存储在变量中。我使用SQL分析器捕获值，然后将它们硬编码到查询中，以查看它是如何工作的。有18个这样的整数数组，有些数组中有超过30个元素。
我认为MS/SQL有必要在语言中引入一些附加的数据类型。数组是非常常见的，我不明白为什么你不能在存储过程中使用它们。
