存储过程读取xml,还有更好的方法吗?SQL server 2008
本文关键字:方法 SQL 2008 server 更好 xml 读取 存储过程 | 更新日期: 2023-09-27 18:10:01
我这样做:
CREATE PROCEDURE [dbo].[InsertStudents]
(
@students nvarchar(max)
)
AS
DECLARE @studentstable TABLE
(
RowIndex int,
FirstName nvarchar(50),
LastName nvarchar(50),
Number nvarchar(20),
IdSchool int
)
DECLARE @xmldata xml
SET @xmldata = @students
INSERT INTO @studentstable
SELECT S.Stud.query('./RowIndex').value('.','int') RowIndex,
S.Stud.query('./FirstName').value('.','nvarchar(50)') FirstName,
S.Stud.query('./LastName').value('.','nvarchar(50)') LastName,
S.Stud.query('./Number').value('.','nvarchar(50)') Number,
S.Stud.query('./IdSchool').value('.','int') IdSchool,
FROM @xmldata.nodes('/Students/Student') AS S(Stud)
DECLARE @totalrows int
DECLARE @currentrow int
DECLARE @totalinserts int
DECLARE @currentfirstname nvarchar(50)
DECLARE @currentlastname nvarchar(50)
DECLARE @currentnumber nvarchar(20)
DECLARE @currentidschool int
DECLARE @insertresult int
SET @totalinserts = 0
SET @totalrows=(SELECT COUNT(*) FROM @studentstable)
SET @currentrow=0
WHILE(@currentrow<@totalrows) BEGIN
SELECT @currentfirstname = FirstName, @currentlastname = LastName, @currentnumber = Number, @currentidschool = IdSchool
FROM @studentstable
WHERE RowIndex=@currentrow
EXEC @insertresult = InsertStudent @currentfirstname, @currentlastname, @currentnumber, @currentidschool
IF @insertresult=0 BEGIN
SET @totalinserts=@totalinserts+1
END
SET @currentrow = @currentrow + 1
END
SELECT @totalinserts
InsertStudent返回0,如果插入成功;如果已经有学生,则返回1。
有没有办法在不搞乱变量表的情况下做到这一点?
使用merge
。
merge Student
using (select S.Stud.query('./RowIndex').value('.','int') RowIndex,
S.Stud.query('./FirstName').value('.','nvarchar(50)') FirstName,
S.Stud.query('./LastName').value('.','nvarchar(50)') LastName,
S.Stud.query('./Number').value('.','nvarchar(50)') Number,
S.Stud.query('./IdSchool').value('.','int') IdSchool
from @xmldata.nodes('/Students/Student') as S(Stud)) as SXML
on Student.Number = SXML.Number
when not matched then
insert (FirstName, LastName, Number, IdSchool)
values (SXML.FirstName, SXML.LastName, SXML.Number, SXML.IdSchool);
select @@rowcount