Question

------------------------这是我的sql程序更新表--------------- ---------

create procedure sp_stepUpdate
@ID int,
@StepOrder int

AS
BEGIN  


IF OBJECT_ID('tempdb.dbo.#UpdateBatch','u') IS NOT NULL
begin
DROP TABLE #UpdateBatch
end

IF OBJECT_ID('tempdb.dbo.#UpdateBatch2','u') IS NOT NULL
begin
DROP TABLE #UpdateBatch2
end

create table #UpdateBatch2
(
ID int,
StepOrder int
)

insert into #UpdateBatch2 values (@ID,@StepOrder)

Select *,ROW_NUMBER() OVER(ORDER BY ID) as newIID into #UpdateBatch
from #UpdateBatch2

set identity_insert [ODM_BatchSteps] ON

Update [ODM_BatchSteps]
set [StepOrder] = newIID
From #UpdateBatch 
where [ODM_BatchSteps].ID = #UpdateBatch.ID

set identity_insert [ODM_BatchSteps] off
END
go

---------------这是程序中的代码，用于从列表中获取新订单------

    connection.Open()


    For Each item As ListViewItem In ListView1.Items

        Dim command As SqlCommand = New SqlCommand("sp_stepUpdate", connection)
        command.CommandType = CommandType.StoredProcedure
        command.Parameters.AddWithValue("@ID", item.SubItems(0).Text)
        command.Parameters.AddWithValue("@StepOrder", item.SubItems(1).Text)
        command.ExecuteNonQuery()
    Next

当我尝试使用listview中的新订单更新表格时，我违反了UNIQUE KEY约束

-----------这是我试图更新的订单-----

    create table [dbo].[ODM_BatchSteps]
(
[ID] uniqueidentifier primary key not null default newid(),
[StepOrder]int ,
[StepType]int,
[StepGrid]nvarchar(max),
[BatchGrid]int,
foreign key (BatchGrid) REFERENCES ODM_Batches(ID)
)

Answer 1

错误意味着您正在尝试插入数据库中已存在的键值（id？）。我只看到一个插入语句，所以你最好检查一下你传递给它的值..

Answer 2

我认为你的字段BatchGrid标识了一组按特定顺序保存的记录如果是这种情况并且没有外键引用您的ODM_BatchSteps字段，那么正确重写此记录块的一种粗鲁但有效的方法是删除引用相同BatchGrid的每个条目。然后重新插入ListView项目中的所有内容

Dim tran as SqlTransaction
Try
    connection.Open()
    tran = connection.BeginTransaction()
    Dim command As SqlCommand = new SqlCommand("DELETE FROM ODM_BatchSteps WHERE BatchGrid = @grd", connection, tran)
    command.Parameters.AddWithValue("@grd", currentGrid)
    command.ExecuteNonQuery()
    For Each item As ListViewItem In ListView1.Items

        ' Now we INSERT every item in the grid passing the parameters 
        ' required to rebuild the block of records for the same BatchGrid
        command = New SqlCommand("usp_stepInsert", connection, tran)
        command.CommandType = CommandType.StoredProcedure
        command.Parameters.AddWithValue("@ID", item.SubItems(0).Text)
        command.Parameters.AddWithValue("@StepOrder", item.SubItems(1).Text)
        command.Parameters.AddWithValue("add the other parameters to rebuild the record")
        command.ExecuteNonQuery()
    Next
    tran.Commit()
Catch Ex as Exception
    ' Log the exception, message to user ???
    tran.RollBack
End Try

当然，您的sp_stepUpdate应该重命名并重写（usp_stepInsert？），以接受以正确的步骤顺序插入新记录所需的所有参数

如果这是一种可行的方法，那么您可以尝试使用Table Valued Parameter来提升性能，而不是为每个项目单独调用数据库

Answer 3

好的感谢帮助人们非常感谢...采取了简单的方法并添加了计数以添加新订单的行数，将其替换为新表中数据库中的旧StepOrder

-------------------- sql update ---------------------

Update [ODM_BatchSteps]
set ODM_BatchSteps.StepOrder = UpdateBatch2.StepOrder
From UpdateBatch2 
where [ODM_BatchSteps].ID = UpdateBatch2.ID

----------------程序中的代码---------------------

Dim count As Integer

    For Each item As ListViewItem In ListView1.Items
        count = count + 1
        Dim command As SqlCommand = New SqlCommand("sp_stepUpdate", connection)
        command.CommandType = CommandType.StoredProcedure

        command.Parameters.AddWithValue("@ID", item.SubItems(0).Text)
        command.Parameters.AddWithValue("@StepOrder", count)
        command.Parameters.AddWithValue("@StepType", item.SubItems(2).Text)
        command.Parameters.AddWithValue("@StepGrid", item.SubItems(3).Text)
        command.Parameters.AddWithValue("@BatchGrid", item.SubItems(4).Text)        
        command.ExecuteNonQuery()

    Next


        connection.Close()

违反UNIQUE KEY约束无法在对象中插入重复键

3 个答案: