你可以使用VB.Net中的ADO.NET库来连接和操作Microsoft Access数据库。以下是一个示例代码,用于循环遍历所有表单并将其导出为文本:
Imports System.Data.OleDb
Imports System.IO
Public Class Form1
Private Sub btnExport_Click(sender As Object, e As EventArgs) Handles btnExport.Click
' 连接到Access数据库
Dim connString As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\path\to\your\access\database.accdb"
Using conn As New OleDbConnection(connString)
conn.Open()
' 获取所有表单的名称
Dim dt As DataTable = conn.GetSchema("Tables")
Dim tableNames As New List(Of String)
For Each row As DataRow In dt.Rows
Dim tableName As String = row("TABLE_NAME").ToString()
If tableName.StartsWith("MSys") Then ' 排除系统表
Continue For
End If
tableNames.Add(tableName)
Next
' 循环遍历每个表单并导出为文本
For Each tableName As String In tableNames
Dim sql As String = $"SELECT * FROM [{tableName}]"
Using cmd As New OleDbCommand(sql, conn)
Using reader As OleDbDataReader = cmd.ExecuteReader()
' 创建一个文件来保存导出的数据
Dim filePath As String = $"C:\path\to\exported\{tableName}.txt"
Using writer As New StreamWriter(filePath)
' 写入表单的列名
For i As Integer = 0 To reader.FieldCount - 1
writer.Write(reader.GetName(i))
If i < reader.FieldCount - 1 Then
writer.Write(vbTab) ' 使用制表符分隔列
End If
Next
writer.WriteLine()
' 写入表单的数据行
While reader.Read()
For i As Integer = 0 To reader.FieldCount - 1
writer.Write(reader(i))
If i < reader.FieldCount - 1 Then
writer.Write(vbTab)
End If
Next
writer.WriteLine()
End While
End Using
End Using
End Using
Next
conn.Close()
End Using
MessageBox.Show("导出完成!")
End Sub
End Class
请确保将“C:\path\to\your\access\database.accdb”替换为你的Microsoft Access数据库的实际文件路径。导出的文件将保存在“C:\path\to\exported\”目录下,每个表单将作为一个单独的文本文件导出。