vb.net 如何寫(xiě)代碼讓SQL SERVER數(shù)據(jù)庫(kù)自動(dòng)計(jì)算

只要是提到“System.Data.OracleClient的”

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連接字符串的例子：

用戶ID =用戶;數(shù)據(jù)源=服務(wù)器/數(shù)據(jù)庫(kù)名;密碼=通過(guò); - 其他與sqlserver的是相似的，但這種改變的OracleConnection

的SqlDataAdapter的SqlConnection想改變OracleDataAdapter

的SqlCommand想改變的OracleCommand

用VB.NET編的計(jì)算器程序！

Public Class SimpleCalculator

Inherits System.Windows.Forms.Form

#Region " Windows 窗體設(shè)計(jì)器生成的代碼 "

Public Sub New()

MyBase.New()

'該調(diào)用是 Windows 窗體設(shè)計(jì)器所必需的。

InitializeComponent()

'在 InitializeComponent() 調(diào)用之后添加任何初始化

End Sub

'窗體重寫(xiě)處置以清理組件列表。

Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)

If disposing Then

If Not (components Is Nothing) Then

components.Dispose()

End If

End If

MyBase.Dispose(disposing)

End Sub

'Windows 窗體設(shè)計(jì)器所必需的

Private components As System.ComponentModel.IContainer

'注意：以下過(guò)程是 Windows 窗體設(shè)計(jì)器所必需的

'可以使用 Windows 窗體設(shè)計(jì)器修改此過(guò)程。

'不要使用代碼編輯器修改它。

Friend WithEvents Label1 As System.Windows.Forms.Label

Friend WithEvents TextBox1 As System.Windows.Forms.TextBox

Friend WithEvents Button1 As System.Windows.Forms.Button

Friend WithEvents Button2 As System.Windows.Forms.Button

Friend WithEvents Button3 As System.Windows.Forms.Button

Friend WithEvents Button4 As System.Windows.Forms.Button

Friend WithEvents Button5 As System.Windows.Forms.Button

Friend WithEvents Button6 As System.Windows.Forms.Button

Friend WithEvents Button7 As System.Windows.Forms.Button

Friend WithEvents Button8 As System.Windows.Forms.Button

Friend WithEvents Button9 As System.Windows.Forms.Button

Friend WithEvents Button10 As System.Windows.Forms.Button

Friend WithEvents Button11 As System.Windows.Forms.Button

Friend WithEvents Button12 As System.Windows.Forms.Button

Friend WithEvents Button13 As System.Windows.Forms.Button

Friend WithEvents Button14 As System.Windows.Forms.Button

Friend WithEvents Button15 As System.Windows.Forms.Button

Friend WithEvents Button16 As System.Windows.Forms.Button

System.Diagnostics.DebuggerStepThrough() Private Sub InitializeComponent()

Me.Label1 = New System.Windows.Forms.Label

Me.TextBox1 = New System.Windows.Forms.TextBox

Me.Button1 = New System.Windows.Forms.Button

Me.Button2 = New System.Windows.Forms.Button

Me.Button3 = New System.Windows.Forms.Button

Me.Button4 = New System.Windows.Forms.Button

Me.Button5 = New System.Windows.Forms.Button

Me.Button6 = New System.Windows.Forms.Button

Me.Button7 = New System.Windows.Forms.Button

Me.Button8 = New System.Windows.Forms.Button

Me.Button9 = New System.Windows.Forms.Button

Me.Button10 = New System.Windows.Forms.Button

Me.Button11 = New System.Windows.Forms.Button

Me.Button12 = New System.Windows.Forms.Button

Me.Button13 = New System.Windows.Forms.Button

Me.Button14 = New System.Windows.Forms.Button

Me.Button15 = New System.Windows.Forms.Button

Me.Button16 = New System.Windows.Forms.Button

Me.SuspendLayout()

'

'Label1

'

Me.Label1.Location = New System.Drawing.Point(16, 16)

Me.Label1.Name = "Label1"

Me.Label1.Size = New System.Drawing.Size(48, 16)

Me.Label1.TabIndex = 0

Me.Label1.Text = "結(jié)果："

'

'TextBox1

'

Me.TextBox1.Location = New System.Drawing.Point(64, 8)

Me.TextBox1.Name = "TextBox1"

Me.TextBox1.Size = New System.Drawing.Size(120, 21)

Me.TextBox1.TabIndex = 1

Me.TextBox1.Text = ""

'

'Button1

'

Me.Button1.Location = New System.Drawing.Point(200, 8)

Me.Button1.Name = "Button1"

Me.Button1.Size = New System.Drawing.Size(56, 24)

Me.Button1.TabIndex = 2

Me.Button1.Text = "清空"

'

'Button2

'

Me.Button2.Location = New System.Drawing.Point(48, 56)

Me.Button2.Name = "Button2"

Me.Button2.Size = New System.Drawing.Size(24, 24)

Me.Button2.TabIndex = 3

Me.Button2.Text = "1"

'

'Button3

'

Me.Button3.Location = New System.Drawing.Point(88, 56)

Me.Button3.Name = "Button3"

Me.Button3.Size = New System.Drawing.Size(24, 24)

Me.Button3.TabIndex = 4

Me.Button3.Text = "2"

'

'Button4

'

Me.Button4.Location = New System.Drawing.Point(136, 56)

Me.Button4.Name = "Button4"

Me.Button4.Size = New System.Drawing.Size(24, 24)

Me.Button4.TabIndex = 5

Me.Button4.Text = "3"

'

'Button5

'

Me.Button5.Location = New System.Drawing.Point(48, 88)

Me.Button5.Name = "Button5"

Me.Button5.Size = New System.Drawing.Size(24, 24)

Me.Button5.TabIndex = 6

Me.Button5.Text = "4"

'

'Button6

'

Me.Button6.Location = New System.Drawing.Point(88, 88)

Me.Button6.Name = "Button6"

Me.Button6.Size = New System.Drawing.Size(24, 24)

Me.Button6.TabIndex = 7

Me.Button6.Text = "5"

'

'Button7

'

Me.Button7.Location = New System.Drawing.Point(136, 88)

Me.Button7.Name = "Button7"

Me.Button7.Size = New System.Drawing.Size(24, 24)

Me.Button7.TabIndex = 8

Me.Button7.Text = "6"

'

'Button8

'

Me.Button8.Location = New System.Drawing.Point(48, 120)

Me.Button8.Name = "Button8"

Me.Button8.Size = New System.Drawing.Size(24, 24)

Me.Button8.TabIndex = 9

Me.Button8.Text = "7"

'

'Button9

'

Me.Button9.Location = New System.Drawing.Point(88, 120)

Me.Button9.Name = "Button9"

Me.Button9.Size = New System.Drawing.Size(24, 24)

Me.Button9.TabIndex = 10

Me.Button9.Text = "8"

'

'Button10

'

Me.Button10.Location = New System.Drawing.Point(136, 120)

Me.Button10.Name = "Button10"

Me.Button10.Size = New System.Drawing.Size(24, 24)

Me.Button10.TabIndex = 11

Me.Button10.Text = "9"

'

'Button11

'

Me.Button11.Location = New System.Drawing.Point(48, 152)

Me.Button11.Name = "Button11"

Me.Button11.Size = New System.Drawing.Size(24, 24)

Me.Button11.TabIndex = 12

Me.Button11.Text = "0"

'

'Button12

'

Me.Button12.Location = New System.Drawing.Point(176, 56)

Me.Button12.Name = "Button12"

Me.Button12.Size = New System.Drawing.Size(24, 24)

Me.Button12.TabIndex = 13

Me.Button12.Text = "+"

'

'Button13

'

Me.Button13.Location = New System.Drawing.Point(176, 88)

Me.Button13.Name = "Button13"

Me.Button13.Size = New System.Drawing.Size(24, 24)

Me.Button13.TabIndex = 14

Me.Button13.Text = "-"

'

'Button14

'

Me.Button14.Location = New System.Drawing.Point(176, 120)

Me.Button14.Name = "Button14"

Me.Button14.Size = New System.Drawing.Size(24, 24)

Me.Button14.TabIndex = 15

Me.Button14.Text = "*"

'

'Button15

'

Me.Button15.Location = New System.Drawing.Point(176, 152)

Me.Button15.Name = "Button15"

Me.Button15.Size = New System.Drawing.Size(24, 24)

Me.Button15.TabIndex = 16

Me.Button15.Text = "/"

'

'Button16

'

Me.Button16.Location = New System.Drawing.Point(88, 152)

Me.Button16.Name = "Button16"

Me.Button16.Size = New System.Drawing.Size(72, 24)

Me.Button16.TabIndex = 17

Me.Button16.Text = "計(jì)算"

'

'SimpleCalculator

'

Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)

Me.ClientSize = New System.Drawing.Size(264, 190)

Me.Controls.Add(Me.Button16)

Me.Controls.Add(Me.Button15)

Me.Controls.Add(Me.Button14)

Me.Controls.Add(Me.Button13)

Me.Controls.Add(Me.Button12)

Me.Controls.Add(Me.Button11)

Me.Controls.Add(Me.Button10)

Me.Controls.Add(Me.Button9)

Me.Controls.Add(Me.Button8)

Me.Controls.Add(Me.Button7)

Me.Controls.Add(Me.Button6)

Me.Controls.Add(Me.Button5)

Me.Controls.Add(Me.Button4)

Me.Controls.Add(Me.Button3)

Me.Controls.Add(Me.Button2)

Me.Controls.Add(Me.Button1)

Me.Controls.Add(Me.TextBox1)

Me.Controls.Add(Me.Label1)

Me.Name = "SimpleCalculator"

Me.Text = "簡(jiǎn)單計(jì)算器"

Me.ResumeLayout(False)

End Sub

#End Region

Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)

End Sub

Private Sub TextBox1_TabStopChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

Dim btn As Button '按鈕類型的變量

btn = sender '把產(chǎn)生該事件的按鈕對(duì)象賦值給btn

TextBox1.Text = TextBox1.Text + btn.Text '把該按鈕的Text屬性值連接到TextBox1中

End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

Dim btn As Button

btn = sender

TextBox1.Text += btn.Text

End Sub

Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click

Dim btn As Button

btn = sender

TextBox1.Text += btn.Text

End Sub

Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click

Dim btn As Button

btn = sender

TextBox1.Text += btn.Text

End Sub

Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click

Dim btn As Button

btn = sender

TextBox1.Text += btn.Text

End Sub

Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click

Dim btn As Button

btn = sender

TextBox1.Text += btn.Text

End Sub

Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click

Dim btn As Button

btn = sender

TextBox1.Text += btn.Text

End Sub

Private Sub Button9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button9.Click

Dim btn As Button

btn = sender

TextBox1.Text += btn.Text

End Sub

Private Sub Button10_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button10.Click

Dim btn As Button

btn = sender

TextBox1.Text += btn.Text

End Sub

Private Sub Button11_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button11.Click

Dim btn As Button

btn = sender

TextBox1.Text += btn.Text

End Sub

Private Sub Button12_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button12.Click

Dim btn As Button

btn = sender

'在文本框的Text屬性后連接一個(gè)空格、本按鈕的Text屬性值和一個(gè)空格

TextBox1.Text = TextBox1.Text + " " + btn.Text + " "

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

TextBox1.Text = "" '清空文本框

End Sub

Private Sub Button13_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button13.Click

Dim btn As Button

btn = sender

TextBox1.Text = TextBox1.Text + " " + btn.Text + " "

End Sub

Private Sub Button14_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button14.Click

Dim btn As Button

btn = sender

TextBox1.Text = TextBox1.Text + " " + btn.Text + " "

End Sub

Private Sub Button15_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button15.Click

Dim btn As Button

btn = sender

TextBox1.Text = TextBox1.Text + " " + btn.Text + " "

End Sub

Private Sub Button16_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button16.Click

'發(fā)生錯(cuò)誤轉(zhuǎn)移到標(biāo)號(hào)“ErrorPro”指定的行去執(zhí)行錯(cuò)誤處理程序

On Error GoTo ErrorPro

Dim r As Decimal '保存計(jì)算結(jié)果的變量

Dim t As String = TextBox1.Text '用于保存文本框中的算術(shù)表達(dá)式

Dim space As Integer = t.IndexOf(" ") '搜索空格位置,如果沒(méi)有空格，返回值為0

'字符串的取子符方法，第二個(gè)參數(shù)小于0，則將產(chǎn)生錯(cuò)誤號(hào)為5的異常，即過(guò)程參數(shù)不正確

Dim s1 As String = t.Substring(0, space) '通過(guò)取子串方法獲得第一個(gè)運(yùn)算數(shù)

Dim op As String = t.Substring(space + 1, 1) '通過(guò)取子串方法獲得運(yùn)算符

Dim s2 As String = t.Substring(space + 3) '通過(guò)取子串方法獲得第二個(gè)運(yùn)算數(shù)

Dim arg1, arg2 As Integer

arg1 = Val(s1) : arg2 = Val(s2)

Select Case op

Case "+" : r = arg1 + arg2

Case "-" : r = arg1 - arg2

Case "*" : r = arg1 * arg2

Case "/" : r = arg1 / arg2

Case Else

MsgBox("輸入的運(yùn)算符有誤！")

Exit Sub

End Select

TextBox1.Text = CStr(r) '顯示結(jié)果

Exit Sub '退出過(guò)程

ErrorPro: '錯(cuò)誤處理程序塊

Select Case Err.Number

Case 6 '除數(shù)為零時(shí)，或運(yùn)算溢出時(shí)的錯(cuò)誤號(hào)

MsgBox("算術(shù)運(yùn)算溢出！", , "溢出提示")

TextBox1.Focus()

Exit Sub

Case 5 ' Substring過(guò)程的參數(shù)不符合要求的錯(cuò)誤號(hào)

MsgBox("必須輸入運(yùn)算符和第二個(gè)運(yùn)算數(shù)！", , "運(yùn)算數(shù)少")

Exit Sub

Case Else

'其它情況顯示錯(cuò)誤號(hào)和錯(cuò)誤原因

MsgBox("錯(cuò)誤號(hào)為" Err.Number Chr(10) Chr(13) "錯(cuò)誤原因：" Err.Description)

Exit Sub

End Select

End Sub

End Class

我在用VB.net做一個(gè)計(jì)算程序，遇到一個(gè)問(wèn)題。一個(gè)數(shù)15563，需要取出萬(wàn)位和千位（1500）

dim a as integer

a=15563

萬(wàn)位=a\10000

千位=a\1000 mod 10

百位=a\100 mod 10

if a mod 105 then 百位+=1

vb.net中如何解決公式計(jì)算的精確度問(wèn)題

僅僅是普通表達(dá)式的話，定義數(shù)據(jù)類型，比如從單精度改為雙精度，如果想保留小數(shù)點(diǎn)位數(shù)，用formatnumber來(lái)處理。如果是某個(gè)算法的精度，就要復(fù)雜一些，要定義一個(gè)誤差，在算法迭代過(guò)程中，用while語(yǔ)句判斷計(jì)算結(jié)果的殘差是否小于定義的誤差值，至于殘差如何計(jì)算，與你的算法有關(guān)

vb.net 用循環(huán)計(jì)算數(shù)組中各元素之和

軟糖來(lái)回答吧，VB.net用循環(huán)是這樣的

Dim?k?=?New?Integer(9)?{1,?2,?3,?4,?5,?6,?7,?8,?9,?10}

Dim?和?As?Integer

For?i?=?0?To?k.Count?-?1

和?+=?k(i)

Next

計(jì)算數(shù)組中各元素之和更簡(jiǎn)單的方法是

使用擴(kuò)展方法Sum或者Lambda表達(dá)式，以下兩種均可

Dim?和1?=?k.Sum()

Dim?和2?=?k.Aggregate(Function(m,?n)?m?+?n)

vb.net 1.1中如何提高循環(huán)計(jì)算速度

運(yùn)用多線程技術(shù)把一個(gè)任務(wù)分配到幾個(gè)線程上讓它們同時(shí)處理,這樣會(huì)比單線程快很多,不過(guò)多線程技術(shù)不是一兩話能說(shuō)清的,你可以查一下相關(guān)的資料.

網(wǎng)頁(yè)標(biāo)題：vb.net迭代計(jì)算,vb中迭代代碼
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