VB.NET修改數據存在多個txtbox時SQL語句的操作是怎樣的

今天就跟大家聊聊有關VB.NET修改數據存在多個txtbox時SQL語句的操作是怎樣的，可能很多人都不太了解，為了讓大家更加了解，小編給大家總結了以下內容，希望大家根據這篇文章可以有所收獲。

VB.NET修改數據存在多個txtbox時,SQL語句的操作
1. 一個Button1的text為查詢和一個DataGridView1,點擊查詢按鈕的代碼
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim strConn = "Data Source=192.168.1.110/orcl;User ID=test;Password=orcl"
        Dim dbcmd As OracleCommand
        Dim dt = New DataTable("ds")
        Dim dbConnection As OracleConnection
        Try
            dbConnection = New OracleConnection(strConn)
            dbConnection.Open()
            dbcmd = dbConnection.CreateCommand
            dbcmd.CommandText = "select * from student"
            Dim da As OracleDataAdapter = New OracleDataAdapter(dbcmd)
            da.Fill(dt)
            DataGridView1.DataSource = dt '這時候可以把dt的值直接賦值給DataGridview1控件
        Catch ex As Exception
            MsgBox("查詢數據庫出錯")
        End Try
    End Sub

2.存在兩個TextBox1.TextBox2,文本框和一個按鈕, Button2,按鈕text為修改,點擊后的代碼
  Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim username, password As String
        Dim temp, temp3 As String
        If Len(TextBox1.Text.Trim) <> 0 Then
            username = "sname=" + "'" + TextBox1.Text.Trim + "'" + " , "
        Else
            username = ""
        End If
        If Len(TextBox2.Text.Trim) <> 0 Then
            password = "spwd=" + "'" + TextBox2.Text.Trim + "'" + " , "
        Else
            password = ""
        End If
        If Len(username) <> 0 And Len(password) <> 0 Then
            temp = username + password
            MsgBox(temp.Length)
            temp = Mid(temp, 1, temp.Length - 3)
            MsgBox("temp" + temp)
            MsgBox("current" + DataGridView1.CurrentRow.Cells(1).Value)
        Else
  
         temp = ""
        End If
       
        Dim strConn = "Data Source=192.168.1.110/orcl;User ID=test;Password=orcl"
        Dim dbcmd As OracleCommand
        Dim dbConnection As OracleConnection
        'If username.Length = 0 And password = 0 Then
        Try
            dbConnection = New OracleConnection(strConn)
            dbConnection.Open()
            dbcmd = dbConnection.CreateCommand
            Dim temp2 As String
            temp2 = "update student set " + temp + "  where sname=" + "'" + DataGridView1.CurrentRow.Cells(1).Value + "'"
            dbcmd.CommandText = temp2
            MsgBox(temp2)
            'dbConnection.BeginTransaction()
            dbcmd.ExecuteNonQuery() '返回改動的row行數
        Catch ex As Exception
            MsgBox("修改失敗")
            Exit Sub
        End Try
        ' Else
        '    MsgBox("請填入要修改的參數")
        'End If
    End Sub

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