vb.net 教程 20-4 库存管理系统3.8 库存货物操作（FormStorageInfoTable）

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vb.net 教程 20-4 库存管理系统3.8 库存货物操作（FormStorageInfoTable）

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提取码：ip5n

需要强调的是，严格控制用户输入，这样可以减少很多代码。例如库存量、采购价格、销售价格使用NumericUpDown控件，而不采用TextBox控件。

全部代码如下：

Imports System.ComponentModel

Imports System.Data.OleDb

Public Class FormStorageInfoTable

'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

Dim arrSupplier As List(Of Integer)

Dim arrGoodsType As List(Of Integer)

'如果是修改原库存物

'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 FormStorageInfoTable_Load(sender As Object, e As EventArgs) Handles MyBase.Load

arrSupplier = New List(Of Integer)

arrGoodsType = New List(Of 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 cbSupplier 和 cbGoodsType

Private Sub fillControls()

'新建OleDbCommand对象实例

Dim command As New OleDbCommand()

'=========填充供应商选择框==================

'要执行的SQL查询

command.CommandText = "select 供应商ID,公司名称 from 供应商"

'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()

'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

arrSupplier.Add(odReader.GetValue(0))

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

Loop

End If

odReader.Close()

'==========填充货物类别选择框===================

'要执行的SQL查询

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

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

odReader = command.ExecuteReader()

'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

arrGoodsType.Add(odReader.GetValue(0))

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

Loop

End If

'关闭数据读取器

odReader.Close()

cbSupplier.SelectedIndex = 0

cbGoodsType.SelectedIndex = 0

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

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 产品名称,单位数量,库存量,产品编号,采购价格,销售价格,供应商ID,类别ID from 货物信息 where 产品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

txtName.Text = odReader.GetValue(0)

txtInfo.Text = odReader.GetValue(1)

nudStock.Value = odReader.GetValue(2)

txtGoodsNo.Text = odReader.GetValue(3)

nudBuyPrice.Value = odReader.GetValue(4)

nudSalePrice.Value = odReader.GetValue(5)

'供应商

Dim supplier As Integer = CType(odReader.GetValue(6), Integer)

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

If supplier = arrSupplier(i) Then

cbSupplier.SelectedIndex = i

Exit For

End If

'货物类别

Dim goodsType As Integer = CType(odReader.GetValue(7), Integer)

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

If goodsType = arrGoodsType(i) Then

cbGoodsType.SelectedIndex = i

Exit For

End If

odReader.Close()

Call UnabledControls()

End If

End Sub

'如果是新建，则允许控件操作

Private Sub EnabledControls()

txtName.Enabled = True

txtInfo.Enabled = True

nudStock.Enabled = True

txtGoodsNo.Enabled = True

nudBuyPrice.Enabled = True

nudSalePrice.Enabled = True

cbSupplier.Enabled = True

cbGoodsType.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()

txtName.Enabled = False

txtInfo.Enabled = False

nudStock.Enabled = False

txtGoodsNo.Enabled = False

nudBuyPrice.Enabled = False

nudSalePrice.Enabled = False

cbSupplier.Enabled = False

cbGoodsType.Enabled = False

btnSave.Enabled = False

btnEdit.Enabled = True

btnClose.Enabled = True

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

Dim errMsg As String = checkData()

If errMsg <> "" Then

MessageBox.Show(errMsg)

Exit Sub

End If

'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、将货物信息添加到数据库中

'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、新增需要返回此次货物对应的编号

command.CommandText = "Select top 1 产品ID from 货物信息 order by 产品ID desc"

Dim odReader As OleDbDataReader

odReader = command.ExecuteReader(CommandBehavior.SingleResult)

odReader.Read()

'记录刚建的出库单ID号

Dim newGoodsID As Integer = odReader.GetInt32(0)

odReader.Close()

'当前货物ID

orderId = newGoodsID

'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()

End If

'保存之后禁止编辑数据

Call UnabledControls()

End Sub

'检查数据合法性

Private Function checkData() As String

If txtName.Text.Trim = "" Then

Return "买家姓名不能为空"

End If

If txtInfo.Text.Trim = "" Then

Return "货物单位数量不能为空"

End If

If txtGoodsNo.Text.Trim = "" Then

Return "货物编号不能为空"

End If

Return ""

End Function

'新增时候插入出库单详细使用的sql语句

Private Function getAddSql() As String

'货物名称

Dim goodsName As String = txtName.Text.Trim

'单位数量

Dim goodsInfo As String = txtInfo.Text

'库存量

Dim Stock As String = nudStock.Value

'货物编号

Dim goodsNo As String = txtGoodsNo.Text

'采购价格

Dim BuyPrice As String = nudBuyPrice.Value

'销售价格

Dim SalePrice As String = nudSalePrice.Value

'供应商

Dim Supplier As Integer = arrSupplier(cbSupplier.SelectedIndex)

'货物类别

Dim GoodsType As String = arrGoodsType(cbGoodsType.SelectedIndex)

Dim sqlString As String

sqlString = "insert into 货物信息(产品名称,产品编号,供应商ID,类别ID,单位数量,采购价格,销售价格,库存量,是否删除) " &

"values('" & goodsName & "','" & goodsNo & "'," & Supplier & "," & GoodsType & ",'" & goodsInfo & "'," &

BuyPrice & "," & SalePrice & "," & Stock & ",'否')"

Return sqlString

End Function

'修改时候出库单详细使用的sql语句

Private Function getEditSql() As String

'货物名称

Dim goodsName As String = txtName.Text.Trim

'单位数量

Dim goodsInfo As String = txtInfo.Text

'库存量

Dim Stock As String = nudStock.Value

'货物编号

Dim goodsNo As String = txtGoodsNo.Text

'采购价格

Dim BuyPrice As String = nudBuyPrice.Value

'销售价格

Dim SalePrice As String = nudSalePrice.Value

'供应商

Dim Supplier As Integer = arrSupplier(cbSupplier.SelectedIndex)

'货物类别

Dim GoodsType As String = arrGoodsType(cbGoodsType.SelectedIndex)

Dim sqlString As String

sqlString = "update 货物信息 set 产品名称='" & goodsName & "',产品编号='" & goodsNo & "',供应商ID=" & Supplier & ",类别ID=" & GoodsType &

",单位数量='" & goodsInfo & "',采购价格=" & BuyPrice & ",销售价格=" & SalePrice &

" where 产品ID=" & orderId

Return sqlString

End Function

'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

Private Sub FormStorageInfoTable_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/114224458

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