以下示例将创建 usp_GetList
存储过程。此过程将返回价格不超过指定数值的产品的列表。此示例显示如何使用多个 SELECT
语句和多个 OUTPUT
参数。OUTPUT 参数允许外部过程、批处理或多条 Transact-SQL 语句在过程执行期间访问设置的某个值。
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USE AdventureWorks; GO IF OBJECT_ID ( 'Production.usp_GetList', 'P' ) IS NOT NULL DROP PROCEDURE Production.usp_GetList; GO CREATE PROCEDURE Production.usp_GetList @product varchar(40) , @maxprice money , @compareprice money OUTPUT , @listprice money OUT AS SELECT p.name AS Product, p.ListPrice AS 'List Price' FROM Production.Product p JOIN Production.ProductSubcategory s ON p.ProductSubcategoryID = s.ProductSubcategoryID WHERE s.name LIKE @product AND p.ListPrice < @maxprice; -- Populate the output variable @listprice. SET @listprice = (SELECT MAX(p.ListPrice) FROM Production.Product p JOIN Production.ProductSubcategory s ON p.ProductSubcategoryID = s.ProductSubcategoryID WHERE s.name LIKE @product AND p.ListPrice < @maxprice); -- Populate the output variable @compareprice. SET @compareprice = @maxprice; GO |
执行 usp_GetList
,返回价格低于 $700
的 Adventure Works 产品(自行车)的列表。OUTPUT
参数 @cost
和 @compareprices
用于流控制语言,以便在“消息”窗口中返回消息。
注意: |
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OUTPUT 变量必须在创建过程时或使用变量时定义。参数名和变量名不一定要匹配;但是,除非使用 @listprice = variable 的形式,否则数据类型和参数位置必须匹配。
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DECLARE @compareprice money, @cost money EXECUTE Production.usp_GetList '%Bikes%', 700, @compareprice OUT, @cost OUTPUT IF @cost <= @compareprice BEGIN PRINT 'These products can be purchased for less than |
下面是部分结果集:
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Product List Price -------------------------------------------------- ------------------ Road-750 Black, 58 539.99 Mountain-500 Silver, 40 564.99 Mountain-500 Silver, 42 564.99 ... Road-750 Black, 48 539.99 Road-750 Black, 52 539.99 (14 row(s) affected) These items can be purchased for less than $700.00. |
+RTRIM(CAST(@compareprice AS varchar(20)))+'.' END ELSE PRINT 'The prices for all products in this category exceed
下面是部分结果集:
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___FCKpd___2 |
+ RTRIM(CAST(@compareprice AS varchar(20)))+'.'
下面是部分结果集:
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___FCKpd___2 |