问题描述
在我的应用程序中，我想执行像 SELECT * FROM tbl WHERE col IN (@list) 之类的查询，其中，@list 可以有变量没有值.我正在使用 MS SQL 服务器数据库.当我用谷歌搜索这个问题时，我找到了这个链接
In my application I want to execute query like SELECT * FROM tbl WHERE col IN (@list) where,@list can have variable no of values. I am using MS SQL server database. When I google this problem then I found this link
http://www.sommarskog.se/arrays-in-sql-2008.html
此链接说要使用表值参数.所以我使用 Microsoft SQL Server Management Studio 创建了用户定义的数据类型.
This link says to use table-valued parameter. So I created user-defined data type using Microsoft SQL Server Management Studio.
CREATE TYPE integer_list_tbltype AS TABLE (n int NOT NULL PRIMARY KEY)
然后我写了存储过程
CREATE PROCEDURE get_product_names @prodids integer_list_tbltype READONLY AS
SELECT p.ProductID, p.ProductName
FROM Northwind.dbo.Products p
WHERE p.ProductID IN (SELECT n FROM @prodids)
然后只使用管理工作室我执行了这个程序
and then using management studio only I executed this procedure
DECLARE @mylist integer_list_tbltype
INSERT @mylist(n) VALUES(9),(12),(27),(37)
EXEC get_product_names @mylist
它给了我正确的输出.但我想知道如何从 java 源代码调用这个存储过程.我知道如何使用常量数量的参数调用简单的存储过程
and it is giving me correct output. But I am wondering how to call this stored procedure from java source code. I know how to call simple stored procedure with constant number of argument
CallableStatement proc_stmt = null;
proc_stmt = con.prepareCall("{call test(?)}");
proc_stmt.setString(1,someValue);
但是如何在表值参数的情况下调用存储过程?
but how to call stored procedure in table-value parameter case?
推荐答案
搜索了一段时间后，我找到了这个问题的答案.特别是当您使用 IN 子句并且操作数不可变时，您可以使用逗号分隔的值作为IN 子句中的输入.
After searching for a while I found answer of this problem.Specially when you use IN clause and no of operands are variable then you can use comma-delimited values as an input in IN clause.
以下示例显示了如何使用动态 SQL 检索指定律师类型的所有律师的存储过程.
Here's the example how the stored procedure that will retrieve all lawyers of the given lawyer type in the provided ZIP code will look like using dynamic SQL.
CREATE PROCEDURE [dbo].[GetLawyers] ( @ZIP CHAR(5), @LawyerTypeIDs VARCHAR(100) )
AS
DECLARE @SQL VARCHAR(2000)
SET @SQL = 'SELECT * FROM [dbo].[Lawyers]
WHERE [ZIP] = ' + @ZIP + ' AND
[LawyerTypeID] IN (' + @LawyerTypeIDs + ')'
EXECUTE (@SQL)
GO
执行存储过程，以逗号分隔值传递用户输入的邮政编码和选定的律师类型:
To execute the stored procedure passing the ZIP code entered by the user and the selected lawyer types in a comma separated value:
EXECUTE [dbo].[GetLawyers] '12345', '1,4'
所以结论是你不需要使用TVP.无论您使用哪种语言[Java，PHP]，只需将参数作为逗号分隔的字符串传递给存储过程，它就会完美运行.
So conclusion is you do not need to use TVP. Whichever language[Java, PHP] you use just pass parameters as comma-delimited string to stored procedure and it will work perfect.
所以在JAVA中你可以调用上面的存储过程:-
So in JAVA you can call above stored procedure:-
proc_stmt = con.prepareCall("{call GetLawyers(?,?)}");
proc_stmt.setString(1,"12345");
proc_stmt.setString(2,"'1,4'");
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