用vb.net 怎樣建立一個mdb數(shù)據(jù)庫及一張表

首先在項目的VB.NET界面，使用菜單【項目】--【添加引用】--【COM】

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選擇 ?Microsoft ADO Ext. 2.x for DDL and Security

然后單擊【確定】，完成引用。

完整代碼如下：

Imports?ADOX

Public?Class?Form1

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

'創(chuàng)建空的access數(shù)據(jù)庫文件--數(shù)據(jù)庫文件.mdb，密碼為123

Dim?Mycat?As?Catalog?=?New?Catalog()

Mycat.Create("Provider=Microsoft.Jet.OLEDB.4.0;Jet?OLEDB:Engine?Type=5;Data?Source=?數(shù)據(jù)庫文件.mdb;Jet?OLEDB:Database?Password=123")

'以下代碼創(chuàng)建一個名為“實驗數(shù)據(jù)表”

Dim?MyTable?As?ADOX.Table?=?New?ADOX.Table?????????'定義新表

MyTable.Name?=?"實驗數(shù)據(jù)表"????'表命名

'給表“實驗數(shù)據(jù)表”?創(chuàng)建一個字符串字段，字段名“姓名”

MyTable.Columns.Append("姓名",?,?ADOX.DataTypeEnum.adWChar)

'給表“實驗數(shù)據(jù)表”?創(chuàng)建一個整數(shù)字段，字段名“學(xué)號”

MyTable.Columns.Append("學(xué)號",?ADOX.DataTypeEnum.adInteger)????'追加一個數(shù)字型字段

'給字段“學(xué)號”創(chuàng)建一個主鍵“PimaryKey_Field”????????

MyTable.Keys.Append("學(xué)號",?ADOX.KeyTypeEnum.adKeyPrimary,?"學(xué)號")

Mycat.Tables.Append(MyTable)?'把所有的新字段追加到表

MyTable?=?Nothing

Mycat?=?Nothing

End?Sub

End?Class

VB.NET大量數(shù)據(jù)列表化實時顯示用什么控件比較好

接收數(shù)據(jù)時，使用一個 Label 顯示就行了。而且跳過一些數(shù)據(jù)再顯示，例如一秒鐘才顯示一個數(shù)據(jù)。

你應(yīng)該把精力放到領(lǐng)導(dǎo)（或者用戶）的意圖上，不要糾結(jié)技術(shù)上的 ListBox。

VB.NET數(shù)組或數(shù)組列表

Dim TestItem() As String = New String() {"Pickle", "Pineapple", "Papaya"} '創(chuàng)建數(shù)組 并賦值

Dim TestShoppingList As String = Join(TestItem, " = ") 'Join 就是字符聯(lián)接函數(shù) 后面的 =號 可選 為空值就把所有的字符串在一起 本例用=號 就是把 所有數(shù)組的值用 =號聯(lián)接起來

MsgBox(TestShoppingList) '顯示結(jié)果值

'這例子 就一個函數(shù)可以解決 就不發(fā)圖片了

希望能幫到你 你慢慢研究吧 有問題可以找我

看到的 愛好者 多頂我一下 謝謝呵呵

利用VB.NET實現(xiàn)導(dǎo)出DataTable數(shù)據(jù)到excel中，各位大俠幫幫忙，最好有源碼，謝謝，江湖救急

剛好寫了個Helper類，你試驗一下DataTable2Exce(這個方法代碼如下：

Imports System.IO

Imports System.Data

Imports System.Data.OleDb

Public MustInherit Class ExcelHelper

Private Shared Function buildConnStr(excelFilePath As String) As String

Dim excelFileInfo As New System.IO.FileInfo(excelFilePath)

Dim constr As String

If excelFileInfo.Extension = ".xlsx" Then

constr = String.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 12.0 Xml;HDR=YES;IMEX=1'", excelFilePath)

Else

constr = String.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties='Excel 8.0;HDR=Yes;IMEX=1'", excelFilePath)

End If

Return constr

End Function

'將datatable導(dǎo)入到excel

Public Shared Function DataTable2Excel(dt As DataTable, excelFilePath As String) As Boolean

If File.Exists(excelFilePath) Then

Throw New Exception("該文件已經(jīng)存在！")

End If

If dt.TableName.Trim.Length = 0 Or dt.TableName.ToLower = "table" Then

dt.TableName = "Sheet1"

End If

Dim colCount As Integer = dt.Columns.Count

Dim pa(colCount - 1) As OleDb.OleDbParameter

Dim tableStructStr As String = "Create Table " dt.TableName "("

Dim connString As String = buildConnStr(excelFilePath)

Dim objconn As New OleDbConnection(connString)

Dim objcmd As New OleDbCommand

objcmd.Connection = objconn

Dim dataTypeList As New ArrayList

dataTypeList.Add("System.Decimal")

dataTypeList.Add("System.Double")

dataTypeList.Add("System.Int16")

dataTypeList.Add("System.Int32")

dataTypeList.Add("System.Int64")

dataTypeList.Add("System.Single")

Dim i As Integer = 0

For Each col As DataColumn In dt.Columns

If dataTypeList.IndexOf(col.GetType.ToString) 0 Then

pa(i) = New OleDbParameter("@" col.ColumnName, OleDbType.Double)

objcmd.Parameters.Add(pa(i))

If i + 1 = colCount Then

tableStructStr += col.ColumnName + " double)"

Else

tableStructStr += col.ColumnName + " double,"

End If

Else

pa(i) = New OleDbParameter("@" col.ColumnName, OleDbType.VarChar)

objcmd.Parameters.Add(pa(i))

If i + 1 = colCount Then

tableStructStr += col.ColumnName + " VarChar)"

Else

tableStructStr += col.ColumnName + " VarChar,"

End If

End If

i += 1

Next

Try

objcmd.CommandText = tableStructStr

If objconn.State = ConnectionState.Closed Then objconn.Open()

objcmd.ExecuteNonQuery()

Catch ex As Exception

Throw ex

End Try

Dim InsertSql_1 As String = "Insert into " + dt.TableName + " ("

Dim InsertSql_2 As String = " Values ("

Dim InsertSql As String = ""

For colID As Integer = 0 To colCount - 1 Step 1

If colID + 1 = colCount Then

InsertSql_1 += dt.Columns(colID).ColumnName ")"

InsertSql_2 += "@" + dt.Columns(colID).ColumnName + ")"

Else

InsertSql_1 += dt.Columns(colID).ColumnName + ","

InsertSql_2 += "@" + dt.Columns(colID).ColumnName + ","

End If

Next

InsertSql = InsertSql_1 + InsertSql_2

For rowID As Integer = 0 To dt.Rows.Count - 1 Step 1

For colID = 0 To dt.Columns.Count - 1

If pa(colID).DbType = DbType.Double And dt.Rows(rowID)(colID).ToString.Trim = "" Then

pa(colID).Value = 0

Else

pa(colID).Value = dt.Rows(rowID)(colID).ToString.Trim

End If

Next

Try

objcmd.CommandText = InsertSql

objcmd.ExecuteNonQuery()

Catch ex As Exception

Throw ex

End Try

Next

Try

If objconn.State = ConnectionState.Open Then objconn.Close()

Catch exp As Exception

Throw exp

End Try

Return True

End Function

' 獲取Excel文件數(shù)據(jù)表列表Sheets

Public Shared Function GetExcelTables(ExcelFileName As String) As ArrayList

'Dim sheets As New List(Of String)

'conn.Open()

'Dim dt As DataTable = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, Nothing)

'For Each r In dt.Rows

' sheets.Add(r("TABLE_NAME"))

'Next

'conn.Close()

'Return sheets

Dim dt As DataTable

If Not File.Exists(ExcelFileName) Then

Throw New Exception("指定的Excel文件不存在")

Return Nothing

End If

Dim tableList As New ArrayList

Using conn As OleDbConnection = New OleDbConnection(buildConnStr(ExcelFileName))

Try

conn.Open()

dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, New Object() {Nothing, Nothing, Nothing, "TABLE"})

Catch ex As Exception

Throw ex

End Try

For i As Integer = 0 To dt.Rows.Count - 1

Dim tableName As String = dt.Rows(i)(2).ToString.Trim.TrimEnd("$")

If tableList.IndexOf(tableName) 0 Then tableList.Add(tableName)

Next

End Using

Return tableList

End Function

'將Excel文件導(dǎo)出至DataTable(第一行作為表頭)

Public Shared Function InputFromExcel(ExcelFileName As String, TableName As String) As DataTable

If Not File.Exists(ExcelFileName) Then

Throw New Exception("指定的Excel文件不存在")

End If

Dim tableList As ArrayList = GetExcelTables(ExcelFileName)

If tableList.IndexOf(TableName) 0 Then

TableName = tableList(0).ToString.Trim

End If

Dim dt As New DataTable

Dim conn As New OleDbConnection(buildConnStr(ExcelFileName))

Dim cmd As New OleDbCommand("select * from [" TableName "$]", conn) '調(diào)試是否需要$

Dim adapter As New OleDbDataAdapter(cmd)

Try

If conn.State = ConnectionState.Closed Then conn.Open()

adapter.Fill(dt)

Catch ex As Exception

Throw ex

Finally

If conn.State = ConnectionState.Open Then conn.Close()

End Try

Return dt

End Function

'查詢excel文件中的一個數(shù)據(jù)

Public Shared Function ReadOneDataFromExcel(ExcelFileName As String, TableName As String, sql As String) As Object

If Not File.Exists(ExcelFileName) Then

Throw New Exception("指定的Excel文件不存在")

End If

Dim tableList As ArrayList = GetExcelTables(ExcelFileName)

If tableList.IndexOf(TableName) 0 Then

TableName = tableList(0).ToString.Trim

End If

Dim dt As New DataTable

Dim conn As New OleDbConnection(buildConnStr(ExcelFileName))

Dim cmd As New OleDbCommand(sql, conn) '調(diào)試是否需要$

Dim ret As Object

Try

If conn.State = ConnectionState.Closed Then conn.Open()

ret = cmd.ExecuteScalar()

Catch ex As Exception

Throw ex

Finally

If conn.State = ConnectionState.Open Then conn.Close()

End Try

Return ret

End Function

'獲取Excel文件指定數(shù)據(jù)表的數(shù)據(jù)列表columnNames

Public Shared Function GetExcelTableColumns(ExcelFileName As String, TableName As String) As ArrayList

Dim dt As DataTable

If Not File.Exists(ExcelFileName) Then

Throw New Exception("指定的Excel文件不存在")

Return Nothing

End If

Dim ColList As New ArrayList

Using conn As OleDbConnection = New OleDbConnection(buildConnStr(ExcelFileName))

Try

conn.Open()

dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Columns, New Object() {Nothing, Nothing, TableName, Nothing})

Catch ex As Exception

Throw ex

End Try

For i As Integer = 0 To dt.Rows.Count - 1

Dim ColName = dt.Rows(i)("Column_Name").ToString().Trim()

ColList.Add(ColName)

Next

End Using

Return ColList

End Function

End Class

vb.net中的list怎樣用數(shù)組添加列表項

list1.additem j 意思就是把j添加至list1列表中,這是在一個for 循環(huán)中，循環(huán)了10次，添加了10次 j，即 list1 中 有10列分別為：1,3,6,10,15,21,28,36,45,55

下面又來了一個循環(huán)， list1.removeitem 刪除列，刪除的是 list1.listcount - i ，list1.listcount 就是總列數(shù)為10，減去 i ，i 是1到4，即10-1，9-2，8-3，7-4 每減掉一次，list1.listcount 就少了一條記錄。

(注意，list1.listcount-1 是最后一條記錄)

減掉了第 9，7，5，3列

剩余為 1,3,6,15,28,45

結(jié)果為：3,15,28

'ListCount返回列表框中的項目總數(shù)

'ListCount-1是列表框中最后一個項目的索引號

'虧你提醒了，我寫錯了，上面修改了，第一個索引為0，最后一個為9.

'也就是，問題所問的第二列的索引為1，第四列的索引為3...

VB.Net中datagridview如何數(shù)據(jù)表

你可以在SQL語句里面把列名變?yōu)橹形拿?再放到DATAGRID里面啊

如 SELECT 字段1 AS 某某1 ,字段2 AS 某某2 FROM 某表

你的串號我已經(jīng)記下，采納后我會幫你制作

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