讲解SQL Server2005数据项的分拆与合并

核心提示： -- = -- Author: LzmTW -- create date: 20080102 -- Description: 分拆字符串 -- @TableName: 数据所在的表的名称 -- @KeyColName: 分拆为子字符串所依据的键值所在的列 -- @SpliteColName

-- =============================================

-- Author: LzmTW

-- create date: 20080102

-- Description: 分拆字符串

-- @TableName: 数据所在的表的名称

-- @KeyColName: 分拆为子字符串所依据的键值所在的列

-- @SpliteColName: 包含要分拆的字符串所在的列

-- @Quote: 分隔子字符串

-- @where: 选择条件，不包含where

-- =============================================

create PROCEDURE [Helper].[SpliteValues]
@TableName nvarchar(100)
,@KeyColName nvarchar(20)
,@SpliteColName nvarchar(20)
,@Quote nvarchar(10) = N’,’
,@where nvarchar(max) = NULL
AS
BEGIN
SET NOcount ON;
DECLARE
@SQL nvarchar(max)
IF @where IS NULL
SET @SQL = N’
select
KeyCol, NewValue
FROM
(
select
KeyCol = @KeyColName
,SpliteCol = CONVERT(xml, N’’’’ + REPLACE(@SpliteColName, N’’@Quote’’, N’’’’) + N’’’’)
FROM @TableName
) a
’
ELSE
SET @SQL = N’
select
KeyCol, NewValue
FROM
(
select
KeyCol = @KeyColName
,SpliteCol = CONVERT(xml, N’’’’ + REPLACE(@SpliteColName, N’’@Quote’’, N’’’’) + N’’’’)
FROM @TableName
where @where
) a
’
SET @SQL = @SQL + N’
OUTER APPLY
(
select NewValue = N.v.value(N’’.’’, ’’nvarchar(max)’’)
FROM SpliteCol.nodes(N’’/root/v’’) N(v)
) b’
SET @SQL = REPLACE(@SQL, N’@TableName’, @TableName)
SET @SQL = REPLACE(@SQL, N’@KeyColName’, @KeyColName)
SET @SQL = REPLACE(@SQL, N’@SpliteColName’, @SpliteColName)
SET @SQL = REPLACE(@SQL, N’@Quote’, @Quote)
IF NOT @where IS NULL
SET @SQL = REPLACE(@SQL, N’@where’, @where)
exec sp_executesql @Sql