[英]How to use if/else in SQL Server stored procedure
我有以下存储过程:
ALTER PROCEDURE [dbo].[Provider]
(@strPro varchar(200))
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
-- Insert statements for procedure here
SELECT *
FROM [db1].[dbo].[table1]
WHERE [Name] = @strPro
END
我有一个下拉列表,其中将包含以下条目:
All People
John D.
Mike K.
Alan H.
Paul Q.
如何修改存储过程,以便如果用户选择All People
则WHERE
语句将成为LIKE
而不是=
符号
例:
ALTER PROCEDURE [dbo].[Provider]
(@strPro varchar(200))
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
-- Insert statements for procedure here
SELECT *
FROM [db1].[dbo].[table1]
if @strPro = 'All People'
BEGIN
WHERE [Name] LIKE '%'
END
ELSE
BEGIN
WHERE [Name] = @strPro
END
END
像这样
SELECT * FROM [db1].[dbo].[table1]
WHERE @strPro = 'All People' OR [Name] = @strPro
如果通过了“所有人员”,则第一个条件为true,并且将返回所有记录(您无需执行类似LIKE '%'
),否则,将仅返回具有匹配的[Name]的记录。
尝试使用类似的方法,在存储过程中构建SQL语句:
ALTER PROCEDURE [dbo].[Provider]
(
@strPro varchar(200)
)
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
DECLARE @SQL varchar(2000)
-- Insert statements for procedure here
SET @SQL = 'SELECT * FROM [db1].[dbo].[table1] '
if @strPro <> 'All People'
BEGIN
SET @SQL = @SQL + ' WHERE [Name] = ''' + @strPro + '''
END
EXEC (@SQL)
END
注意1:如果要使用“所有人”,则不需要WHERE子句。注意2:您可能需要调整某些单引号。
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