是否可以将Dictionary<String, String>
(或类似的东西;如键/值对)作为参数传递给MS SQL 2005服务器上的存储过程?
我正在寻找一个实际的例子。
更新
这个问题使我问this one。
最佳答案
您需要一种在TSQL中拆分和处理字符串的方法,有很多方法可以做到这一点。本文介绍了几乎每种方法的优点和缺点:
"Arrays and Lists in SQL Server 2005 and Beyond, When Table Value Parameters Do Not Cut it" by Erland Sommarskog
您需要创建一个拆分功能。这是分割函数的使用方式:
SELECT
*
FROM YourTable y
INNER JOIN dbo.yourSplitFunction(@Parameter) s ON y.ID=s.Value
I prefer the number table approach to split a string in TSQL,但是在SQL Server中有很多分割字符串的方法,请参阅前面的链接,其中解释了每种方法的优点和缺点。
为了使Numbers Table方法起作用,您需要进行一次时间表设置,这将创建一个表
Numbers
,该表包含从1到10,000的行:SELECT TOP 10000 IDENTITY(int,1,1) AS Number
INTO Numbers
FROM sys.objects s1
CROSS JOIN sys.objects s2
ALTER TABLE Numbers ADD CONSTRAINT PK_Numbers PRIMARY KEY CLUSTERED (Number)
设置号码表后,请创建以下拆分功能:
CREATE FUNCTION [dbo].[FN_ListToTableRows]
(
@SplitOn char(1) --REQUIRED, the character to split the @List string on
,@List varchar(8000)--REQUIRED, the list to split apart
)
RETURNS TABLE
AS
RETURN
(
----------------
--SINGLE QUERY-- --this will return empty rows, and row numbers
----------------
SELECT
ROW_NUMBER() OVER(ORDER BY number) AS RowNumber
,LTRIM(RTRIM(SUBSTRING(ListValue, number+1, CHARINDEX(@SplitOn, ListValue, number+1)-number - 1))) AS ListValue
FROM (
SELECT @SplitOn + @List + @SplitOn AS ListValue
) AS InnerQuery
INNER JOIN Numbers n ON n.Number < LEN(InnerQuery.ListValue)
WHERE SUBSTRING(ListValue, number, 1) = @SplitOn
);
GO
现在,您可以轻松地将CSV字符串拆分为表格并加入表格。要完成您的任务,请假设您可以传入两个参数,其中之一是值之一,然后按以下步骤创建过程:
CREATE PROCEDURE StoredProcedureName
(
@Params1 int
,@Array1 varchar(8000)
,@Params2 int
,@Array2 varchar(8000)
)
AS
DECLARE @YourTable table (col1 int, col2 int)
INSERT INTO @YourTable
(col1, col2)
SELECT
a1.ListValue, a2.ListValue
FROM dbo.FN_ListToTableRows(',',@Array1) a1
INNER JOIN dbo.FN_ListToTableRows(',',@Array2) a2 ON a1.RowNumber=a2.RowNumber
select * from @YourTable
GO
测试一下:
exec StoredProcedureName 17,'127,204,110,198',7,'162,170,163,170'
输出:
(4 row(s) affected)
col1 col2
----------- -----------
127 162
204 170
110 163
198 170
(4 row(s) affected)
或者,如果您要传递单个参数键值对,请使用以下命令:
CREATE PROCEDURE StoredProcedureName
(
@KeyValueList varchar(8000)
)
AS
DECLARE @YourTable table (RowKey varchar(500), RowValue varchar(500))
INSERT INTO @YourTable
(RowKey, RowValue)
SELECT
LEFT(y.ListValue,CHARINDEX(',',y.ListValue)-1),RIGHT(y.ListValue,LEN(y.ListValue)-CHARINDEX(',',y.ListValue))
FROM dbo.FN_ListToTableRows(';',@KeyValueList) y
SELECT * FROM @YourTable
GO
运行:
exec StoredProcedureName 'a,5;b,BBB;abc,xyz'
输出:
RowKey RowValue
------- -----------
a 5
b BBB
abc xyz
(3 row(s) affected)
关于sql-server-2005 - 将列表结构作为参数传递给存储过程,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/3557658/