我想创建一个存储过程,它接受一串逗号分隔的值,如“1,2,3,4”,并将其拆分并使用这些数字在不同的表上运行查询。 / p>
所以在同一个存储过程中,它会像
那样select somefield from sometable where somefield = 1
select somefield from sometable where somefield = 2
select somefield from sometable where somefield = 3
select somefield from sometable where somefield = 4
谢谢!
答案 0 :(得分:5)
查看Erland Sommarskog关于如何将值列表传递给SQL Server 2005中的存储过程的优秀文章:
Arrays and Lists in SQL Server 2005 and Beyond
由此,您应该能够根据自己的标准创建查询。
答案 1 :(得分:3)
点击此处http://www.sommarskog.se/arrays-in-sql-2005.html#CSV 假设你想这样做
select somefield from sometable where somefield in(1,2,3,4)
答案 2 :(得分:0)
有一个非常好看的例子here。
使用链接中定义的分割功能,您可以执行此操作。
SELECT *
FROM table
WHERE id in ( SELECT convert(int,Value) FROM dbo.Split(@list_string,',')
或者,您可以使用split值的表值函数版本加入主查询。
答案 3 :(得分:0)
如果你想变得复杂,可以将输入字符串转换为临时表/表变量,然后在闲暇时进行一系列的IF语句或查询。
SQLServer proc采用逗号分隔的输入字符串并将其作为表变量返回。
IF EXISTS(SELECT name FROM sysobjects WHERE name = 'fn_parseString' AND (type = 'TF' OR type = 'IF' OR type = 'FN'))
DROP FUNCTION fn_parseString
GO
/* This function takes a comma delimited string of information and parses it based on commas, returning the resultant strings. */
CREATE FUNCTION fn_parseString
(@StringToParse TEXT)
RETURNS @StringTable TABLE (ParsedString VARCHAR(8000), StringIndex INT)
AS
BEGIN
DECLARE @CurrentString VARCHAR(8000)
DECLARE @CurrentStringIndex INT
DECLARE @TextLength INT
DECLARE @Index INT
DECLARE @Letter VARCHAR(1)
DECLARE @PreviousLetter VARCHAR(1)
SET @CurrentString = ''
SET @CurrentStringIndex = 0
SET @TextLength = DATALENGTH(@StringToParse)
SET @PreviousLetter = ''
SET @Index = 1
WHILE @Index <= @TextLength
BEGIN
SET @Letter = SUBSTRING(@StringToParse, @Index, 1)
IF @Letter = ','
BEGIN
SET @CurrentStringIndex = @CurrentStringIndex + 1
INSERT INTO @StringTable
(ParsedString,
StringIndex)
VALUES (@CurrentString,
@CurrentStringIndex)
IF @@ERROR <> 0
BEGIN
DELETE
FROM @StringTable
RETURN
END
SET @CurrentString = ''
END
ELSE IF @PreviousLetter <> ',' OR (@PreviousLetter = ',' AND @Letter <> ' ') /* Get rid of the spaces inserted when the string was created. */
BEGIN
SET @CurrentString = @CurrentString + @Letter
END
SET @PreviousLetter = @Letter
SET @Index = @Index + 1
END
IF @CurrentString <> ''
BEGIN
SET @CurrentStringIndex = @CurrentStringIndex + 1
INSERT INTO @StringTable
(ParsedString,
StringIndex)
VALUES (@CurrentString,
@CurrentStringIndex)
IF @@ERROR <> 0
BEGIN
DELETE
FROM @StringTable
RETURN
END
END
RETURN
END
在其他地方访问该功能的代码:
DECLARE @CommaDelimitedString VARCHAR(8000)
SET @CommaDelimitedString = '1,2,3,4,5,6,7,8,cow,dog,horse'
DECLARE @StringTable TABLE
(StringValue VARCHAR(8000),
ColumnID INT)
SET NOCOUNT ON
INSERT INTO @StringTable
(StringValue,
ColumnID)
SELECT ParsedString,
StringIndex
FROM dbo.fn_ParseString(@CommaDelimitedString)
IF @@ERROR <> 0
BEGIN
SET NOCOUNT OFF
RAISERROR('An error occurred while parsing the AccountIDs out of the string.',16,1)
END
SELECT * FROM [Sometable] JOIN @StringTable AS tmp ON [sometable.value] = tmp.StringValue