vb.net 教程 20-4 库存管理系统3.11 入库单操作（FormStorageInOrder）

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vb.net 教程 20-4 库存管理系统3.11 入库单操作（FormStorageInOrder）

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入库单中，如果修改了货物种类、数量，应该对前后货物情况进行组合，获得货物增删情况，并最终对应修改在货物信息表的库存量字段中的数据。例如下面

原入库单中入库的三种货物的ID和数量： 1,10 2,20 3,30

修改后入库单中三种货物的ID和数量：2,25 3,20 4,15

先进行组合，然后再修改货物信息表的库存量

组合后的货物ID和数量： 1,10 2,-5 3,10 4,-15

在代码中使用 Dictionary(Of Integer, Integer) 保存旧、新入库单中货物ID和数量，再使用editGoodsCount()方法对数据进行组合。关于Dictionary，请参看教程第4.2.3节《键值对集合》。

全部代码如下：

Imports System.ComponentModel

Imports System.Data.OleDb

Public Class FormStorageInOrder

'是否新增标志，如果是，设置为True；否则False

Dim isAdd As Boolean

'传入的入库单ID号，也是判断新增还是修改的依据

Dim orderId As Integer

Dim connection As OleDbConnection

'修改入库清单中的物品时设置标记

Dim isEditGoods As Boolean = False

Structure GoodsType

Dim TypeId As Integer

Dim TypeInfo As String

End Structure

Dim arrExpress As List(Of Integer)

Dim arrGoodsType As List(Of GoodsType)

'如果是修改原入库单

'键值对分别保存货物ID和对应数量，需要在货物信息表（库存）中进行增删

'原入库单中的

Dim dicGoodsInfoOld As Dictionary(Of Integer, Integer)

'修改后入库单中的

Dim dicGoodsInfoNew As Dictionary(Of Integer, Integer)

'根据传入的入库单号进行确认操作

'如果入库号为0，那么新增

'否则，修改

Public Sub New(ByVal OrderId As Integer)

' 此调用是设计器所必需的。

InitializeComponent()

' 在 InitializeComponent() 调用之后添加任何初始化。

Me.orderId = OrderId

If Me.orderId = 0 Then isAdd = True Else isAdd = False

End Sub

Private Sub FormStorageInOrder_Load(sender As Object, e As EventArgs) Handles MyBase.Load

dtpOrder.Value = Now

dtpEnter.Value = Now

arrExpress = New List(Of Integer)

arrGoodsType = New List(Of GoodsType)

dicGoodsInfoOld = New Dictionary(Of Integer, Integer)

dicGoodsInfoNew = New Dictionary(Of Integer, Integer)

connection = New OleDbConnection(databaseConnString)

'打开数据连接

connection.Open()

Call fillControls()

Call drawControls()

End Sub

'填充数据选项，主要是 cbExpress 和 cbGoodsType

Private Sub fillControls()

'新建OleDbCommand对象实例

Dim command As New OleDbCommand()

'==========填充货物种类选择框===================

'要执行的SQL查询

command.CommandText = "select * from 货物类别"

'设置OleDbCommand的数据连接为OleDbConnection

command.Connection = connection

'声明OleDbDataReader对象

Dim odReader As OleDbDataReader

'通过OleDbCommand的ExecuteReader方法获得OleDbDataReader对象实例。

odReader = command.ExecuteReader()

Dim gt As GoodsType

'如果OleDbDataReader中包含数据

If odReader.HasRows Then

'循环读取每一行数据，直到Read方法返回False

Do While odReader.Read

gt.TypeId = odReader.GetValue(0)

cbGoodsType.Items.Add(odReader.GetValue(1))

gt.TypeInfo = odReader.GetValue(2)

arrGoodsType.Add(gt)

Loop

End If

'关闭数据读取器

odReader.Close()

End Sub

'向控件中填充数据

'如果是新增，那么保持控件原状

'如果是修改，那么需要读取数据库中的数据再填充

Private Sub drawControls()

If isAdd = True Then

cbGoodsType.SelectedIndex = 0

Call EnabledControls()

Else

'如果是修改数据，那么填充所有控件中的数据

'新建OleDbCommand对象实例

Dim command As New OleDbCommand()

'=========填充lvGoodsType==================

'要执行的SQL查询

command.CommandText = "select 操作员ID,订购日期,入库日期 from 入库单 where 入库单ID=" & orderId

'设置OleDbCommand的数据连接为OleDbConnection

command.Connection = connection

'声明OleDbDataReader对象

Dim odReader As OleDbDataReader

'通过OleDbCommand的ExecuteReader方法获得OleDbDataReader对象实例。

odReader = command.ExecuteReader(CommandBehavior.SingleRow)

odReader.Read()

'省略了检查数据记录是否有效

Dim recordUserID As Integer = odReader.GetValue(0)

dtpOrder.Value = odReader.GetValue(1).ToString

dtpEnter.Value = odReader.GetValue(2).ToString

cbGoodsType.SelectedIndex = 0

odReader.Close()

'=========填充 lvEnterInfo ==================

'要执行的SQL查询

command.CommandText = "SELECT 入库单明细.产品ID, 货物信息.产品名称, 入库单明细.单价, 入库单明细.数量 " &

"FROM 货物信息 INNER JOIN 入库单明细 ON 货物信息.产品ID = 入库单明细.产品ID " &

"where 入库单明细.入库单ID=" & orderId

'设置OleDbCommand的数据连接为OleDbConnection

command.Connection = connection

odReader = command.ExecuteReader()

Dim lvItem As ListViewItem

'如果OleDbDataReader中包含数据

If odReader.HasRows Then

'循环读取每一行数据，直到Read方法返回False

Do While odReader.Read

lvItem = New ListViewItem(odReader.GetValue(0).ToString)

lvItem.SubItems.Add(odReader.GetValue(1).ToString)

lvItem.SubItems.Add(odReader.GetValue(2).ToString)

lvItem.SubItems.Add(odReader.GetValue(3).ToString)

lvEnterInfo.Items.Add(lvItem)

dicGoodsInfoOld.Add(odReader.GetValue(0), odReader.GetValue(3))

Loop

End If

odReader.Close()

Call UnabledControls()

If recordUserID <> loginId Then

btnSave.Enabled = False

btnEdit.Enabled = False

End If

End Sub

'如果是新建，则允许控件操作

Private Sub EnabledControls()

dtpOrder.Enabled = True

dtpEnter.Enabled = True

lvGoods.Enabled = True

btnGoodsAdd.Enabled = True

btnDelete.Enabled = True

txtGoodsPrice.Enabled = True

nudGoodsCount.Enabled = True

lvEnterInfo.Enabled = True

btnSave.Enabled = True

btnEdit.Enabled = False

btnClose.Enabled = True

End Sub

'如果是修改，初始不允许控件操作

Private Sub UnabledControls()

dtpOrder.Enabled = False

dtpEnter.Enabled = False

cbGoodsType.Enabled = False

lvGoods.Enabled = False

btnGoodsAdd.Enabled = False

btnDelete.Enabled = False

txtGoodsPrice.Enabled = False

nudGoodsCount.Enabled = False

lvEnterInfo.Enabled = False

btnSave.Enabled = False

btnEdit.Enabled = True

btnClose.Enabled = True

End Sub

'入库物类别选中

Private Sub cbGoodsType_SelectedIndexChanged(sender As Object, e As EventArgs) Handles cbGoodsType.SelectedIndexChanged

Dim selIndex As Integer = cbGoodsType.SelectedIndex

lblGoodsTypeInfo.Text = arrGoodsType(selIndex).TypeInfo

lvGoods.Items.Clear()

Call fillLvGoods(arrGoodsType(selIndex).TypeId)

End Sub

'当选择货物种类时，填充lvGoodsType数据

Private Sub fillLvGoods(ByVal TypeId As Integer)

'新建OleDbCommand对象实例

Dim command As New OleDbCommand()

'=========填充lvGoodsType==================

'要执行的SQL查询

command.CommandText = "Select 产品ID,产品名称,采购价格,销售价格,库存量 from 货物信息 where 类别ID=" & TypeId

'设置OleDbCommand的数据连接为OleDbConnection

command.Connection = connection

'声明OleDbDataReader对象

Dim odReader As OleDbDataReader

'通过OleDbCommand的ExecuteReader方法获得OleDbDataReader对象实例。

odReader = command.ExecuteReader()

Dim lvItem As ListViewItem

'如果OleDbDataReader中包含数据

If odReader.HasRows Then

'循环读取每一行数据，直到Read方法返回False

Do While odReader.Read

lvItem = New ListViewItem(odReader.GetValue(0).ToString)

lvItem.SubItems.Add(odReader.GetValue(1).ToString)

lvItem.SubItems.Add(odReader.GetValue(2).ToString)

lvItem.SubItems.Add(odReader.GetValue(3).ToString)

lvItem.SubItems.Add(odReader.GetValue(4).ToString)

lvGoods.Items.Add(lvItem)

Loop

End If

odReader.Close()

End Sub

'修改数据

Private Sub btnEdit_Click(sender As Object, e As EventArgs) Handles btnEdit.Click

'按下后允许修改数据

Call EnabledControls()

End Sub

'保存数据

Private Sub btnSave_Click(sender As Object, e As EventArgs) Handles btnSave.Click

'新建OleDbCommand对象实例

Dim command As New OleDbCommand()

'设置OleDbCommand的数据连接为OleDbConnection

command.Connection = connection

'保存数据，分两种情况

'新增或修改

If isAdd = True Then

'1、将出库单添加到数据库中

'新增的SQL语句

command.CommandText = getAddSql()

'不管是新增还是修改，都不用返回值，所以使用ExecuteNonQuery。

command.ExecuteNonQuery()

'2、新增需要返回此次出库单对应的编号

command.CommandText = "Select top 1 入库单ID from 入库单 order by 入库单ID desc"

Dim odReader As OleDbDataReader

odReader = command.ExecuteReader(CommandBehavior.SingleResult)

odReader.Read()

'记录刚建的入库单ID号

Dim newOrderID As Integer = odReader.GetInt32(0)

odReader.Close()

'3、向出库单明细中加入出库物品

Call addGoodsDetailed(newOrderID)

'4、修改货物信息表中对应的数量

Call editGoodsCount()

'当前出库单ID

orderId = newOrderID

'设置标志为修改

isAdd = False

Else

'修改的SQL语句

command.CommandText = getEditSql()

'不管是新增还是修改，都不用返回值，所以使用ExecuteNonQuery。

command.ExecuteNonQuery()

'如果修改了出库物品，那么

If isEditGoods = True Then

'1、删除出库单明细中原有出库物品

command.CommandText = "delete * from 出库单明细 where 订单ID=" & orderId

command.ExecuteNonQuery()

'2、重新向出库单明细中加入出库物品

Call addGoodsDetailed(orderId)

'3、修改货物信息表中对应的数量

Call editGoodsCount()

End If

'刷新货物信息 lvGoods

Dim selIndex As Integer = cbGoodsType.SelectedIndex

lblGoodsTypeInfo.Text = arrGoodsType(selIndex).TypeInfo

lvGoods.Items.Clear()

Call fillLvGoods(arrGoodsType(selIndex).TypeId)

'保存之后禁止编辑数据

Call UnabledControls()

End Sub

'新增时候插入入库单详细使用的sql语句

Private Function getAddSql() As String

'订购日期时间

Dim orderTime As String = dtpOrder.Text

'入库日期时间

Dim enterTime As String = dtpEnter.Text

Dim sqlString As String

sqlString = "insert into 入库单(操作员ID,订购日期,入库日期,是否删除) " &

"values(" & loginId & ",'" & orderTime & "','" & enterTime & "','否')"

Return sqlString

End Function

'修改时候入库单详细使用的sql语句

Private Function getEditSql() As String

'订购日期时间

Dim orderTime As String = dtpOrder.Text

'入库日期时间

Dim enterTime As String = dtpEnter.Text

Dim sqlString As String

sqlString = "update 入库单 set 订购日期='" & orderTime & "',入库日期='" & enterTime & "' where 入库单ID=" & orderId

Return sqlString

End Function

'增加入货单明细内容

Private Sub addGoodsDetailed(ByVal id As Integer)

'新建OleDbCommand对象实例

Dim command As New OleDbCommand()

'设置OleDbCommand的数据连接为OleDbConnection

command.Connection = connection

Dim lvi As ListViewItem

Dim GoodsID As Integer

Dim GoodsPrice As Single

Dim GoodsCount As Integer

'购买清单中的货物逐项加入数据表出库单明细

For i As Integer = 0 To lvEnterInfo.Items.Count - 1

lvi = lvEnterInfo.Items(i)

GoodsID = CType(lvi.SubItems(0).Text, Integer)

GoodsPrice = CType(lvi.SubItems(2).Text, Single)

GoodsCount = CType(lvi.SubItems(3).Text, Integer)

command.CommandText = "insert into 入库单明细 values(" & id & "," & GoodsID & "," & GoodsPrice & "," & GoodsCount & ")"

command.ExecuteNonQuery()

dicGoodsInfoNew.Add(CType(lvi.SubItems(0).Text, Integer), CType(lvi.SubItems(3).Text, Integer))

End Sub

'修改货物信息表中的数量

Private Sub editGoodsCount()

'将前后两个Dictionary组合在一起，获得修改后货物的增减量

'A B 组合后

'1,10 2,25 1,10

'2,20 3,20 2,-5

'3,30 4,15 3,10

' 4,-15

'修改原 Dictionary

For i As Integer = 0 To dicGoodsInfoNew.Count - 1

Dim singleGoodsNew As KeyValuePair(Of Integer, Integer) = dicGoodsInfoNew.ElementAt(i)

If dicGoodsInfoOld.ContainsKey(singleGoodsNew.Key) = True Then

Console.WriteLine("输出： {0} {1}", dicGoodsInfoOld(singleGoodsNew.Key), singleGoodsNew.Value)

dicGoodsInfoOld(singleGoodsNew.Key) = dicGoodsInfoOld(singleGoodsNew.Key) - singleGoodsNew.Value

Else

dicGoodsInfoOld.Add(singleGoodsNew.Key, 0 - singleGoodsNew.Value)

End If

'修改数据库

Dim command As New OleDbCommand()

command.Connection = connection

'购买清单中的货物逐项加入数据表出库单明细

For Each singleGoodsNew As KeyValuePair(Of Integer, Integer) In dicGoodsInfoOld

'只需要对数量有变化的货物进行修改

If singleGoodsNew.Value <> 0 Then

command.CommandText = "update 货物信息 set 库存量=库存量-(" & singleGoodsNew.Value & ") where 产品ID=" & singleGoodsNew.Key

'Console.WriteLine("value:" & singleGoodsNew.Value)

'Console.WriteLine(command.CommandText)

command.ExecuteNonQuery()

End If

'数据库中修改后，将原Dictionary的值修改为新Dictionary的值

dicGoodsInfoOld = dicGoodsInfoNew

dicGoodsInfoNew.Clear()

End Sub

'按下关闭按钮

Private Sub btnClose_Click(sender As Object, e As EventArgs) Handles btnClose.Click

If btnSave.Enabled = True Then

If MessageBox.Show("数据未保存，是否退出？", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning) = DialogResult.OK Then

Me.Close()

End If

Else

Me.Close()

End If

End Sub

'点击lvGoods中的项目，将数据添加到对应位置

Private Sub lvGoods_MouseClick(sender As Object, e As MouseEventArgs) Handles lvGoods.MouseClick

Dim lvhti As ListViewHitTestInfo = lvGoods.HitTest(e.X, e.Y)

If IsNothing(lvhti.Item) Then

Exit Sub

End If

lblGoodsID.Text = lvhti.Item.SubItems(0).Text

lblGoodsName.Text = lvhti.Item.SubItems(1).Text

txtGoodsPrice.Text = lvhti.Item.SubItems(3).Text

End Sub

'购买的货物信息增加到lvBuyInfo

Private Sub btnGoodsAdd_Click(sender As Object, e As EventArgs) Handles btnGoodsAdd.Click

Dim GoodsID As String = lblGoodsID.Text

Dim GoodsName As String = lblGoodsName.Text

Dim GoodsPrice As Single

If Single.TryParse(txtGoodsPrice.Text, GoodsPrice) = False Then

MessageBox.Show("不是有效的货物价格。")

Exit Sub

End If

Dim GoodsCount As Integer = nudGoodsCount.Value

For i As Integer = 0 To lvEnterInfo.Items.Count - 1

If GoodsID = lvEnterInfo.Items(i).Text Then

MessageBox.Show("该货物已经添加，请先删除再添加。", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning)

Exit Sub

End If

'添加到lvEnterInfo

Dim lvi As New ListViewItem(GoodsID)

lvi.SubItems.Add(GoodsName)

lvi.SubItems.Add(GoodsPrice)

lvi.SubItems.Add(GoodsCount)

lvEnterInfo.Items.Add(lvi)

'标记修改了出库物品

isEditGoods = True

End Sub

'删除增加的出库物品

Private Sub btnDelete_Click(sender As Object, e As EventArgs) Handles btnDelete.Click

If lvEnterInfo.SelectedItems.Count < 1 Then

MessageBox.Show("未选择需要删除的数据")

Exit Sub

End If

lvEnterInfo.Items.Remove(lvEnterInfo.SelectedItems(0))

'标记修改了出库物品

isEditGoods = True

End Sub

Private Sub FormStorageInOrder_Closing(sender As Object, e As CancelEventArgs) Handles Me.Closing

connection.Close()

End Sub

End Class

由于.net平台下C#和vb.NET很相似，本文也可以为C#爱好者提供的参考。

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原文链接：https://blog.csdn.net/UruseiBest/article/details/114224586

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