参数给EXISTS子句在存储过程 [英] Parameters to the EXISTS clause in a stored procedure
问题描述
我有一个表 DEPT
,其中包含两列 - ID,名称
一个搜索表单呈现从 DEPT
表中的ID和用户可以选择任意数量的ID并提交表单,得到相关姓名
澄清/输入:
- 我不希望建立一个动态查询 - 它不是管理
- 我使用表值参数的偏爱存储过程
任何其他解决方案进行
请注意:结果
这个例子是简单的用1台 - 在现实生活中,我要处理超过6桌
感谢您的任何建议。
CREATE TYPE dbo.DeptList
如表
(
ID INT
);
GO
CREATE PROCEDURE dbo.RetrieveDepartments
@dept_list AS dbo.DeptList READONLY
AS
BEGIN
SET NOCOUNT ON;
选择的名字从dbo.table1 WHERE ID IN(SELECT ID FROM @dept)
UNION ALL
选择的名字从dbo.table2 WHERE ID IN(SELECT ID FROM @dept)
- ...
端
GO
现在在C#代码,创建一个DataTable,用的ID填写它,并把它传递到存储过程。假设你已经有一个名为tempList列表和ID存储在ID:
<预类=郎-CS prettyprint-覆盖>
DataTable的TVP =新的DataTable();
tvp.Columns.Add(新的DataColumn(ID));
的foreach(在tempList VAR项)
{
tvp.Rows.Add(item.id);使用(connObject)
{
的SqlCommand CMD =新的SqlCommand(StoredProcedure的connObject)
}
;
cmd.CommandType = CommandType.StoredProcedure;
的SqlParameter tvparam = cmd.Parameters.AddWithValue(@ dept_list,TVP);
tvparam.SqlDbType = SqlDbType.Structured;
:
}
您还可以使用拆分功能。许多存在的,这是我喜欢的,如果你能保证输入是安全的(无<,>,&安培;等):
<预类=朗SQL prettyprint-覆盖>
CREATE FUNCTION dbo.SplitInts_XML
(
@list VARCHAR(MAX),
@Delimiter CHAR(1)
)
RETURNS TABLE
AS
返回
(
选择项目= yivalue('(./文())[1]','廉政')
从
(
选择X = CONVERT(XML,'< I>'
+ REPLACE(@list,@Delimiter,'< I> /;< I>')+' < /我方式>')查询('')
)作为一个
CROSS APPLY x.nodes(I)为Y(I)
);
GO
现在你的程序可以是:
<预类=郎-SQL prettyprint-覆盖>
CREATE PROCEDURE dbo.RetrieveDepartments
@dept_list VARCHAR(MAX),
AS
BEGIN
SET NOCOUNT ON;
;以D AS(SELECT ID = FROM dbo.SplitInts(@dept_list,项目','))
从dbo.table1 SELECT name,其中ID IN(SELECT ID FROM D)
UNION ALL
选择的名字从dbo.table2 WHERE ID IN(SELECT ID FROM D)
- ...
端
GO
I have a table DEPT
, which holds 2 columns - ID, NAME
.
A search form is presented with the IDs from the DEPT
table and the user can chose any number of IDs and submit the form, to get the related NAMEs
.
Clarification/Inputs:
- I don't want to build a dynamic query - its not manageable.
- I prefer a stored procedure using table-valued parameters
Any other solutions to proceed?
NOTE:
This example is simple with 1 table - in real life, I have to deal with more than 6 tables!
Thanks for any suggestions
CREATE TYPE dbo.DeptList
AS TABLE
(
ID INT
);
GO
CREATE PROCEDURE dbo.RetrieveDepartments
@dept_list AS dbo.DeptList READONLY
AS
BEGIN
SET NOCOUNT ON;
SELECT Name FROM dbo.table1 WHERE ID IN (SELECT ID FROM @dept)
UNION ALL
SELECT Name FROM dbo.table2 WHERE ID IN (SELECT ID FROM @dept)
-- ...
END
GO
Now in your C# code, create a DataTable, fill it in with the IDs, and pass it in to the stored procedure. Assuming you already have a list called tempList and the IDs are stored in id:
DataTable tvp = new DataTable();
tvp.Columns.Add(new DataColumn("ID"));
foreach(var item in tempList)
{
tvp.Rows.Add(item.id);
}
using (connObject)
{
SqlCommand cmd = new SqlCommand("StoredProcedure", connObject);
cmd.CommandType = CommandType.StoredProcedure;
SqlParameter tvparam = cmd.Parameters.AddWithValue("@dept_list", tvp);
tvparam.SqlDbType = SqlDbType.Structured;
...
}
You can also use a split function. Many exist, this is the one I like if you can guarantee that the input is safe (no <, >, & etc.):
CREATE FUNCTION dbo.SplitInts_XML
(
@List VARCHAR(MAX),
@Delimiter CHAR(1)
)
RETURNS TABLE
AS
RETURN
(
SELECT Item = y.i.value('(./text())[1]', 'int')
FROM
(
SELECT x = CONVERT(XML, '<i>'
+ REPLACE(@List, @Delimiter, '</i><i>') + '</i>').query('.')
) AS a
CROSS APPLY x.nodes('i') AS y(i)
);
GO
Now your procedure can be:
CREATE PROCEDURE dbo.RetrieveDepartments
@dept_list VARCHAR(MAX)
AS
BEGIN
SET NOCOUNT ON;
;WITH d AS (SELECT ID = Item FROM dbo.SplitInts(@dept_list, ','))
SELECT Name FROM dbo.table1 WHERE ID IN (SELECT ID FROM d)
UNION ALL
SELECT Name FROM dbo.table2 WHERE ID IN (SELECT ID FROM d)
-- ...
END
GO
这篇关于参数给EXISTS子句在存储过程的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!