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  • vb.net 教程 8-4 excel操作 2

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设计界面:
 
 
 
代码:
 
1、引用OleDb
 
Imports System.Data.OleDb
2、定义两个全局变量:
 
    Dim filename As String = "d:\销售.xls"
 
    Dim conn As OleDbConnection
3、窗体载入的时候:
 
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        conn = New OleDbConnection()
        conn.ConnectionString = "Provider = Microsoft.ACE.OLEDB.12.0;data source=" & filename & ";Extended Properties='Excel 12.0 XML;HDR=YES;'" 
        conn.Open()
    End Sub
4、显示所有数据,使用OleDbDataReader逐一读取,参看:vb.net 教程 8-3 数据库操作2,请大家注意select语句,使用方括号"[工作表名$]"来表示要操作的工作表。
 
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
 
        Dim sql As String = "select * from [Sheet1$]"
        Dim cmd As New OleDbCommand(sql, conn)
 
 
        Dim dr As OleDbDataReader = cmd.ExecuteReader
        Dim fc As Integer = dr.FieldCount
 
        Dim shuju As String = ""
 
        If dr.HasRows Then
            Dim strtemp As String = ""
            Do While dr.Read
                strtemp = ""
                For i As Integer = 0 To fc - 1
                    strtemp &= dr(i) & " "
                Next
                strtemp &= ControlChars.CrLf
                shuju &= strtemp
            Loop
 
        End If
        TextBox1.Text = shuju
        dr.Close()
    End Sub
执行后:
 
 
5、同样的,如果选择单价7000以上的电脑:
 
    Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
        Dim sql As String = "select * from [Sheet1$] where 价格>7000"
        Dim cmd As New OleDbCommand(sql, conn)
 
 
        Dim dr As OleDbDataReader = cmd.ExecuteReader
        Dim fc As Integer = dr.FieldCount
 
        Dim shuju As String = ""
 
        If dr.HasRows Then
            Dim strtemp As String = ""
            Do While dr.Read
                strtemp = ""
                For i As Integer = 0 To fc - 1
                    strtemp &= dr(i) & " "
                Next
                strtemp &= ControlChars.CrLf
                shuju &= strtemp
            Loop
 
        End If
        TextBox1.Text = shuju
        dr.Close()
    End Sub
运行时:
 
 
 
6、插入新数据:
 
    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        Dim sql As String = "insert into [Sheet1$] values(7,'华硕','飞行堡垒',8099,17)"
        Dim cmd As New OleDbCommand(sql, conn)
 
        Dim fc As Integer = cmd.ExecuteNonQuery()
 
    End Sub
运行时:
 
 
 
7、更新数据:
 
    Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
        Dim sql As String = "update [Sheet1$] set 型号='玩家国度',价格=10799  where 编号=7"
        Dim cmd As New OleDbCommand(sql, conn)
 
        Dim fc As Integer = cmd.ExecuteNonQuery()
    End Sub
运行时:
 
 
 
8、删除数据,请看完后面的说明。
 
    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
        Dim sql As String = "delete * from [Sheet1$] where 日期=20180301"
        Dim cmd As New OleDbCommand(sql, conn)
 
        Dim fc As Integer = cmd.ExecuteNonQuery()
    End Sub
非常遗憾,删除的时候会出错:
 
 
 
经过多方查证,使用操作数据库的方法对excel表是不能执行删除的。
 
以后在讲office操作的时候会讲到如何删除数据。
 
 
 
 
 
 
 
由于.net平台下C#和vb.NET很相似,本文也可以为C#爱好者提供参考。
 
学习更多vb.net知识,请参看vb.net 教程 目录
 
 
 
 
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版权声明:本文为CSDN博主「VB.Net」的原创文章,遵循CC 4.0 BY-SA版权协议,转载请附上原文出处链接及本声明。
原文链接:https://blog.csdn.net/uruseibest/article/details/79733318

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