VB.net怎么訪問數據集？我是VS2019的。

可用ado.net訪問。

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換電腦數據還在要求有服務器，要么是局域網內一臺服務器，要么是公網服務器。

VB.NET數據集怎么排序？

給數據集排序？為什么不直接在SQL文里排序。。如果你逼不得已非要用數據集排序。。就得循環了，循環數據集，按照你的需求來做出排序，重新綁定到數據集里。。

vb.net的數據庫連接

1·綁定數據源來進行連接

2.用代碼連接

先到數據庫建立一個數據庫和相應的表

連接數據庫的代碼：

Dim str As String = "Data Source=服務器名;Initial Catalog=數據庫名;Persist Security Info=True;User ID=;Password="

dim conn As SqlClient.SqlConnection

try

conn = New SqlClient.SqlConnection

conn.ConnectionString = str

conn.Open()

Return True

Catch ex As Exception

MsgBox(ex.ToString)

Return False

End Try

登錄代碼：Dim str As String = "Data Source=服務器名;Initial Catalog=數據庫名;Persist Security Info=True;User ID=;Password="

dim conn As SqlClient.SqlConnection

conn = New SqlClient.SqlConnection

conn.ConnectionString = str

conn.Open()

sqlstr = "Select * From Amd Where AmdName='" TextBox1.Text "' And AmdPwd = '" TextBox2.Text "'"

Dim sqlcmd As SqlClient.SqlCommand = New SqlClient.SqlCommand(sqlstr, conn)

Dim dr As SqlClient.SqlDataReader

dr = sqlcmd.ExecuteReader

If dr.Read = True Then '判斷一條記錄為真

kf.Show() '顯示下個窗體

Me.Hide() ’隱藏當前窗體

Else

MessageBox.Show("輸入信息有誤！", "提示")

TextBox1.Text = ""

TextBox2.Text = ""

End If

vb.net讀取Access數據庫的方法

建立數據集，綁定到窗口。不會的話，把要用的表從數據集拖到窗口，再刪除就行了

提取方法

數據及名稱.表格名稱.rows（2）.item(3).tostring 就是了

vb.net數據庫操作

參考一下下面這段代碼就可以了。

Imports System.Data

'引入數據庫操作類命名空間

Imports System.Data.OleDb

'引入ADO.NET操作命名空間

Public Class FrmModifystInfo

Inherits System.Windows.Forms.Form

Public ADOcmd As OleDbDataAdapter

Public ds As DataSet = New DataSet()

'建立DataSet對象

Public mytable As Data.DataTable

'建立表單對象

Public myrow As Data.DataRow

'建立數據行對象

Public rownumber As Integer

'定義一個整型變量來存放當前行數

Public SearchSQL As String

Public cmd As OleDbCommandBuilder

'======================================================

#Region " Windows 窗體設計器生成的代碼 "

#End Region

'======================================================

Private Sub FrmModifystInfo_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load

'窗體的載入

TxtSID.Enabled = False

TxtName.Enabled = False

ComboSex.Enabled = False

TxtBornDate.Enabled = False

TxtClassno.Enabled = False

TxtRuDate.Enabled = False

TxtTel.Enabled = False

TxtAddress.Enabled = False

TxtComment.Enabled = False '設置信息為只讀

Dim tablename As String = "student_Info "

SearchSQL = "select * from student_Info "

ExecuteSQL(SearchSQL, tablename) '打開數據庫

ShowData() '顯示記錄

End Sub

Private Sub ShowData()

'在窗口中的textbox中顯示數據

myrow = mytable.Rows.Item(rownumber)

TxtSID.Text = myrow.Item(0).ToString

TxtName.Text = myrow.Item(1).ToString

ComboSex.Text = myrow.Item(2).ToString

TxtBornDate.Text = Format(myrow.Item(3), "yyyy-MM-dd ")

TxtClassno.Text = myrow.Item(4).ToString

TxtTel.Text = myrow.Item(5).ToString

TxtRuDate.Text = Format(CDate(myrow.Item(6)), "yyyy-MM-dd ")

TxtAddress.Text = myrow.Item(7).ToString

TxtComment.Text = myrow.Item(8).ToString

End Sub

Private Sub BtFirst_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtFirst.Click

'指向第一條數據

rownumber = 0

ShowData()

End Sub

Private Sub BtPrev_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtPrev.Click

'指向上一條數據

BtNext.Enabled = True

rownumber = rownumber - 1

If rownumber 0 Then

rownumber = 0 '如果到達記錄的首部，行號設為零

BtPrev.Enabled = False

End If

ShowData()

End Sub

Private Sub BtNext_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtNext.Click

'指向上一條數據

BtPrev.Enabled = True

rownumber = rownumber + 1

If rownumber mytable.Rows.Count - 1 Then

rownumber = mytable.Rows.Count - 1 '判斷是否到達最后一條數據

BtNext.Enabled = False

End If

ShowData()

End Sub

Private Sub BtLast_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtLast.Click

'指向最后一條數據

rownumber = mytable.Rows.Count - 1

ShowData()

End Sub

Private Sub BtDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtDelete.Click

mytable.Rows.Item(rownumber).Delete() '刪除記錄

If MsgBox( "確定要刪除改記錄嗎？ ", MsgBoxStyle.OKCancel + vbExclamation, "警告 ") = MsgBoxResult.OK Then

cmd = New OleDbCommandBuilder(ADOcmd)

'使用自動生成的SQL語句

ADOcmd.Update(ds, "student_Info ")

BtNext.PerformClick()

End If

End Sub

Private Sub BtModify_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtModify.Click

TxtSID.Enabled = False '關鍵字段只讀

TxtName.Enabled = True '可讀寫

ComboSex.Enabled = True

TxtBornDate.Enabled = True

TxtClassno.Enabled = True

TxtRuDate.Enabled = True

TxtTel.Enabled = True

TxtAddress.Enabled = True

TxtComment.Enabled = True

End Sub

Private Sub BtUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtUpdate.Click

If Not Testtxt(TxtName.Text) Then

MsgBox( "請輸入姓名！ ", vbOKOnly + vbExclamation, "警告 ")

TxtName.Focus()

Exit Sub

End If

If Not Testtxt(ComboSex.Text) Then

MsgBox( "請選擇性別！ ", vbOKOnly + vbExclamation, "警告 ")

ComboSex.Focus()

Exit Sub

End If

If Not Testtxt(TxtClassno.Text) Then

MsgBox( "請選擇班號！ ", vbOKOnly + vbExclamation, "警告 ")

TxtClassno.Focus()

Exit Sub

End If

If Not Testtxt(TxtTel.Text) Then

MsgBox( "請輸入聯系電話！ ", vbOKOnly + vbExclamation, "警告 ")

TxtTel.Focus()

Exit Sub

End If

If Not Testtxt(TxtAddress.Text) Then

MsgBox( "請輸入家庭住址！ ", vbOKOnly + vbExclamation, "警告 ")

TxtAddress.Focus()

Exit Sub

End If

If Not IsNumeric(Trim(TxtSID.Text)) Then

MsgBox( "請輸入數字學號！ ", vbOKOnly + vbExclamation, "警告 ")

Exit Sub

TxtSID.Focus()

End If

If Not IsDate(TxtBornDate.Text) Then

MsgBox( "出生時間應輸入日期格式（yyyy-mm-dd）！ ", vbOKOnly + vbExclamation, "警告 ")

Exit Sub

TxtBornDate.Focus()

End If

If Not IsDate(TxtRuDate.Text) Then

MsgBox( "入校時間應輸入日期格式（yyyy-mm-dd）！ ", vbOKOnly + vbExclamation, "警告 ")

TxtRuDate.Focus()

Exit Sub

End If

myrow.Item(0) = Trim(TxtSID.Text)

myrow.Item(1) = Trim(TxtName.Text)

myrow.Item(2) = Trim(ComboSex.Text)

myrow.Item(3) = Trim(TxtBornDate.Text)

myrow.Item(4) = Trim(TxtClassno.Text)

myrow.Item(5) = Trim(TxtTel.Text)

myrow.Item(6) = Trim(TxtRuDate.Text)

myrow.Item(7) = Trim(TxtAddress.Text)

myrow.Item(8) = Trim(TxtComment.Text)

mytable.GetChanges()

cmd = New OleDbCommandBuilder(ADOcmd)

'使用自動生成的SQL語句

ADOcmd.Update(ds, "student_Info ")

'對數據庫進行更新

MsgBox( "修改學籍信息成功！ ", vbOKOnly + vbExclamation, "警告 ")

TxtName.Enabled = False

ComboSex.Enabled = False

TxtBornDate.Enabled = False

TxtClassno.Enabled = False

TxtRuDate.Enabled = False

TxtTel.Enabled = False

TxtAddress.Enabled = False

TxtComment.Enabled = False '重新設置信息為只讀

End Sub

Private Sub BtCancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtCancel.Click

TxtSID.Enabled = False

TxtName.Enabled = False

ComboSex.Enabled = False

TxtBornDate.Enabled = False

TxtClassno.Enabled = False

TxtRuDate.Enabled = False

TxtTel.Enabled = False

TxtAddress.Enabled = False

TxtComment.Enabled = False

End Sub

Public Function ExecuteSQL(ByVal SQL As String, ByVal table As String)

Try

'建立ADODataSetCommand對象

'數據庫查詢函數

ADOcmd = New OleDbDataAdapter(SQL, "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\student.mdb ")

'建立ADODataSetCommand對象

ADOcmd.Fill(ds, table) '取得表單

mytable = ds.Tables.Item(0) '取得名為table的表

rownumber = 0 '設置為第一行

myrow = mytable.Rows.Item(rownumber)

'取得第一行數據

Catch

MsgBox(Err.Description)

End Try

End Function

End Class

vb.net從數據庫讀取信息填充treeview做成層次目錄怎么做

給你一段我曾經寫的代碼，主要是生成TreeView的節點！有什么不懂的地方你就提！

Public Sub InitializeTreeView(ByVal strvXL As TreeView, ByVal vrsRecordTwo As DataSet)

Dim treBaseNodeOne As TreeNode

Dim treBaseNodeTwo As TreeNode

Dim strDWDM As String

m_rsRecordTwo = g_clsSybase.SelectSC_PD_SBCSB1()

'查找供電局信息

g_clsSybase.SelectRS_ZZJG_ZZJGDMB(m_rsRecordOne)

'添加根節點

Do While m_rsRecordOne.Read

strDWDM = m_rsRecordOne.GetString(0) '獲取單位代碼

treBaseNodeOne = New TreeNode

treBaseNodeOne.Text = m_rsRecordOne.GetString(1).Trim() '獲取單位名稱

treBaseNodeOne.Name = m_rsRecordOne.GetString(1)

treBaseNodeOne.Tag = ""

strvXL.Nodes.Add(treBaseNodeOne)

'添加樹結構第二層

Dim drsTwo() As DataRow

drsTwo = m_rsRecordTwo.Tables(0).Select("SSDW='" strDWDM "' and SC__XLBM is null")

For Each dr As DataRow In drsTwo

treBaseNodeTwo = New TreeNode

treBaseNodeTwo.Text = dr.Item("XLMC").ToString.Trim

treBaseNodeTwo.Name = dr.Item("XLMC")

treBaseNodeTwo.Tag = dr.Item("XLBM")

treBaseNodeOne.Nodes.Add(treBaseNodeTwo)

Next

Loop

m_rsRecordOne.Close()

End Sub

當前標題：vb.net數據集,vbnet數據庫
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