用SQL语句判断数记录是否存在

发布时间：2013-09-19 11:33:46来源：阅读（1894）

ALTER PROCEDURE wg_News_InsertCategory

@Name  varchar(50),
@Description varchar(250),
@ImageUrl varchar(250),
@CategoryID int OUTPUT
AS
DECLARE @CurrID int


-- see if the category already exists


SELECT @CurrID = CategoryID
 FROM News_Categories
 WHERE Name = @Name


-- if not, add it


IF @CurrID IS NULL
 BEGIN
 INSERT INTO News_Categories
  (Name, Description, ImageUrl)
  VALUES (@Name, @Description, @ImageUrl)
 SET @CategoryID = @@IDENTITY
 IF @@ERROR > 0
  BEGIN
  RAISERROR ('Insert of Category failed', 16, 1)
  RETURN 99
  END
 END
ELSE
 BEGIN
 SET @CategoryID = -1
 END