从存储过程中删除XML中的行

Question

我想看看是否可以使用存储过程从xml中删除一些数据。

我有一个XML文件，每次我将数据添加到我的表中时，它也会将它添加到我的XML文件中。 这是我的XML文件的示例：

<?xml version="1.0"?>

<appSchedule>

<task time="08/06/2016 9:25:00" name="79"/>
<task time="08/06/2016 9:25:00" name="80"/>
<task time="08/06/2016 9:25:00" name="81"/>
</appSchedule>

如您所见，名称和时间都是我表格中的字段。 哪个Name是我表中记录的id及其唯一值。

我想知道是否有办法，当我删除Name=79表格时我的数据库也从XML文件中删除原始数据？ 这是我的删除存储过程。 SmsSCh_ID值与XML中的Name相同

ALTER  PROCEDURE [dbo].[Cp_SmsSchPrj_Delete]
@SmsSCh_ID bigint = null,
@SmsSCh_IDs nvarchar(1000)=null
,@SmsSCh_UserIDReg int = null
AS
BEGIN
BEGIN TRY
BEGIN TRANSACTION SmsSCh
if (@SmsSCh_ID is not null)
begin
Delete from Prj_SmsSch where SmsSCh_ID=@SmsSCh_ID
select 1
end
else
begin 
delete from Prj_SmsSch where SmsSCh_ID in (SELECT * FROM UF_CSVToTable(@SmsSCh_IDs))
end  
COMMIT TRANSACTION SmsSCh
END TRY
BEGIN CATCH
ROLLBACK TRANSACTION SmsSCh
RETURN ERROR_MESSAGE()
END CATCH
END

谢谢

Answer 1

DECLARE @x XML = N'
<appSchedule>
    <task time="08/06/2016 9:25:00" name="79"/>
    <task time="08/06/2016 9:25:00" name="80"/>
    <task time="08/06/2016 9:25:00" name="81"/>
    <task time="08/06/2016 9:25:00" name="82"/>
</appSchedule>'

DECLARE @ignore_list TABLE (id INT)
INSERT INTO @ignore_list VALUES (79), (82)

DECLARE @t VARCHAR(50) = ''
SELECT @t += ',' + CAST(id AS VARCHAR(8000)) FROM @ignore_list
SET @t += ','

SET @x.modify('delete /appSchedule/task[(contains(sql:variable("@t"), concat(",", @name, ",")))]')

SELECT @x

Answer 2

阅读有关XML DML delete https://msdn.microsoft.com/en-us/library/ms190254.aspx
例

declare @x XML =
'<?xml version="1.0"?>
<appSchedule>
<task time="08/06/2016 9:25:00" name="79"/>
<task time="08/06/2016 9:25:00" name="80"/>
<task time="08/06/2016 9:25:00" name="81"/>
</appSchedule>'
--- read from file. Path is relative to server machine
SELECT @x = cast(x.bulkColumn as XML) 
FROM OPENROWSET(BULK 'c:\mydir\myfile.xml', SINGLE_CLOB) AS x

set @x.modify('delete  /appSchedule/task[@name="79"]');

select @x;

关于OPENROWSET BULK SINGLE_BLOB https://msdn.microsoft.com/en-us/library/ms190312.aspx

Answer 3

这是我的方法

CREATE TABLE #yourXmlStore (ID INT, YourXML XML);
INSERT INTO #yourXmlStore VALUES
(1,'<appSchedule>
    <task time="08/06/2016 9:25:00" name="79"/>
    <task time="08/06/2016 9:25:00" name="80"/>
    <task time="08/06/2016 9:25:00" name="81"/>
    </appSchedule>');

CREATE TABLE #yourData (ID INT IDENTITY, name VARCHAR(100),time DATETIME);
INSERT INTO #yourData(name,time) VALUES
 ('79',{ts'2016-06-08 09:25:00'})
,('80',{ts'2016-06-08 09:25:00'})
,('81',{ts'2016-06-08 09:25:00'});
GO

CREATE PROCEDURE DeleteTask @name VARCHAR(100)
AS
BEGIN
    DELETE FROM #yourData WHERE name=@name;
    UPDATE #yourXmlStore SET YourXML.modify('delete /appSchedule/task[@name=sql:variable("@name")]');
END
GO

SELECT * FROM #yourData;
SELECT * FROM #yourXmlStore;
EXEC DeleteTask @name='79';
SELECT * FROM #yourData;
SELECT * FROM #yourXmlStore;
GO

DROP TABLE #yourData;
DROP TABLE #yourXmlStore;   
DROP PROCEDURE DeleteTask;