将列表结构作为参数传递给存储过程

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。本文介绍了几乎所有方法的优缺点:

"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函数。拆分函数的使用方法如下:

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中分割字符串的方法有很多种,请参阅前面的链接,它解释了每种方法的优缺点。

要使数字表方法工作,您需要执行此一次性表设置,它将创建一个表。 Numbers 包含从1到10000行的:

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)

设置好数字表后,创建此拆分函数:

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字符串拆分为一个表并在表中联接。要完成任务,SIF可以传递两个参数,一个是键,另一个是值,然后创建如下过程:

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

测试出来:

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,如果要传入一个参数键值对,请使用如下方法:

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

运行它:

exec StoredProcedureName 'a,5;b,BBB;abc,xyz'

输出:

RowKey  RowValue
------- -----------
a       5
b       BBB
abc     xyz

(3 row(s) affected)

将此字典格式化为XML并将其传递给SQL Server。它了解XML数据类型并可以查询它。

<Data>
  <Entry Key="1" Value="One" />
  <Entry Key="2" Value="Two" />
</Data>

并将其作为sqldatatype.xml传递。SQL 2005及更高版本能够从XML查询。在SQL Server中有许多如何使用XML的示例。