Question

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，以便用户选择All People WHERE语句为LIKE而不是=符号

示例：

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

Answer 1

喜欢这个

SELECT * FROM [db1].[dbo].[table1]
WHERE @strPro = 'All People' OR [Name] = @strPro

如果传递“所有人” - 第一个条件将为真且所有记录将被返回（您不需要执行LIKE '%'）否则只会返回匹配[名称]的记录。

Answer 2

尝试这样的事情，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：如果你想要所有人＆＃39;你不会需要一个WHERE子句。 ... 注2：您可能需要调整一些单引号...

如何在SQL Server存储过程中使用if / else

2 个答案: