Beispielübungen für die VB-Operation ACCESS – Codeausschnitt für Geldautomaten

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Universell
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Stellen Sie eine Verbindung zur Datenbank her (spleißen Sie einfach die Verbindungsdatenbankzeichenfolge und rufen Sie die Funktion auf )?

Dim Con As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source= ATM.mdb"
        Dim connConnection As OleDb.OleDbConnection = New OleDb.OleDbConnection
        connConnection.ConnectionString = Con
        connConnection.Open()

Beenden (tatsächlich werden einfach alle geöffneten Fenster ausgeblendet und das Anmeldefenster angezeigt):

 Private Function UserIsValid() As Boolean
        '连接数据库
        Dim Con As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source= ATM.mdb"
        Dim connConnection As OleDb.OleDbConnection = New OleDb.OleDbConnection
        connConnection.ConnectionString = Con
        connConnection.Open()

    '验证一下用户名密码是否存在
        Dim strSql As String = "select * from AccountInfo where AccountNo = '" & _
       Trim(TextBox1.Text) & "' and Password = '" & Trim(TextBox2.Text) & "'"
        Dim connCommand As OleDb.OleDbCommand = New OleDb.OleDbCommand(strSql, connConnection)
        Dim myReader As OleDb.OleDbDataReader = connCommand.ExecuteReader


        '如果有数据
        If myReader.HasRows Then
            myReader.Read() '读一行数据到reader里面
            If Trim(TextBox1.Text) = myReader(1) And Trim(TextBox2.Text) = myReader(2) Then
                connConnection.Close()
                Return True
            Else
                connConnection.Close()
                Return False
            End If


        End If
        connConnection.Close()
        '没数据直接返回错误
        Return False

    End Function

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Kunde
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Auszahlung:

For Each f As Form In Application.OpenForms
            f.Hide()
            frmLogin.Show()
        Next

Einzahlung:

 '连接数据库
        Dim Con As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source= ATM.mdb"
        Dim connConnection As OleDb.OleDbConnection = New OleDb.OleDbConnection
        connConnection.ConnectionString = Con
        connConnection.Open()


        '修改金额(存钱)
        Dim sql As String = "update AccountInfo set Balance = Balance + " + TextBox1.Text + " where AccountNo = '" + frmLogin.TextBox1.Text + "'"
        Dim cmd As OleDb.OleDbCommand = New OleDb.OleDbCommand(sql, connConnection)
        cmd.ExecuteNonQuery()


        '记录操作日志
        sql = "insert into AccountAct (AccountNo,Lastopt,Amount) values ('" & Trim(frmLogin.TextBox1.Text) & "','" & Trim(DateTime.Now.ToString()) & "',
        " & CType(TextBox1.Text, Double) & ")"
        Dim cmd2 As OleDb.OleDbCommand = New OleDb.OleDbCommand(sql, connConnection)
        cmd2.ExecuteNonQuery()


        connConnection.Close()

Kontoanfrage:

'连接数据库
        Dim Con As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source= ATM.mdb"
        Dim connConnection As OleDb.OleDbConnection = New OleDb.OleDbConnection
        connConnection.ConnectionString = Con
        connConnection.Open()


        '修改金额(取钱)
        Dim sql As String = "update AccountInfo set Balance = Balance - " + TextBox2.Text + " where AccountNo = '" + frmLogin.TextBox1.Text + "'"
        Dim cmd As OleDb.OleDbCommand = New OleDb.OleDbCommand(sql, connConnection)
        cmd.ExecuteNonQuery()
        '记录操作日志
        sql = "insert into AccountAct (AccountNo,Lastopt,Amount) values ('" & Trim(frmLogin.TextBox1.Text) & "','" & Trim(DateTime.Now.ToString()) & "',
        " & CType(TextBox1.Text, Integer) & ")"
        cmd = New OleDb.OleDbCommand(sql, connConnection)
        cmd.ExecuteNonQuery()


        connConnection.Close()

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Administrator
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Aufzeichnen Betriebsprotokoll:

'连接数据库
        Dim Con As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source= ATM.mdb"
        Dim connConnection As OleDb.OleDbConnection = New OleDb.OleDbConnection
        connConnection.ConnectionString = Con
        connConnection.Open()


        Dim sql As String = "select Balance from AccountInfo where AccountNo = '" + frmLogin.TextBox1.Text + "'"
        Dim cmd As OleDb.OleDbCommand = New OleDb.OleDbCommand(sql, connConnection)
        Dim myReader As OleDb.OleDbDataReader = cmd.ExecuteReader
        If myReader.HasRows Then
            myReader.Read()
            Label1.Text = myReader(0)
        Else
            MessageBox.Show("未找到账户信息")
        End If


        connConnection.Close()

Alle Betriebsprotokolle anzeigen:

 sql = "insert into AccountAct (AccountNo,Lastopt,Amount) values ('" & Trim(frmLogin.TextBox1.Text) & "','" & Trim(DateTime.Now.ToString()) & "',
 " & CType(TextBox1.Text, Integer) & ")"
        cmd = New OleDb.OleDbCommand(sql, connConnection)
        cmd.ExecuteNonQuery()


        connConnection.Close()

Alle Benutzerkonten anzeigen

'连接数据库
        Dim Con As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source= ATM.mdb"
        Dim connConnection As OleDb.OleDbConnection = New OleDb.OleDbConnection
        connConnection.ConnectionString = Con
        connConnection.Open()


        '把查询的数据取出来放到data set
        Dim strSql As String = "select * from AccountAct"
        Dim myDataSet As DataSet = New DataSet()
        Dim myAdapter As OleDb.OleDbDataAdapter = New OleDb.OleDbDataAdapter(strSql, connConnection)
        myAdapter.Fill(myDataSet, "AccountAct")
        connConnection.Close()


        '把数据从dataset中取出来显示在控件上()
        DataGridView1.DataSource = myDataSet.Tables(0)
        DataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells

Das Obige sind VB-Operations-ACCESS-Beispielübungen - -Der Inhalt des Geldautomatencode-Segments Weitere verwandte Inhalte finden Sie auf der chinesischen PHP-Website (www.php.cn)!

 '连接数据库
        Dim Con As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source= ATM.mdb"
        Dim connConnection As OleDb.OleDbConnection = New OleDb.OleDbConnection
        connConnection.ConnectionString = Con
        connConnection.Open()


        '把查询的数据取出来放到data set
        Dim strSql As String = "select * from AccountInfo"
        Dim myDataSet As DataSet = New DataSet()
        Dim myAdapter As OleDb.OleDbDataAdapter = New OleDb.OleDbDataAdapter(strSql, connConnection)
        myAdapter.Fill(myDataSet, "AccountInfo")
        connConnection.Close()


        '把数据从dataset中取出来显示在控件上()
        DataGridView1.DataSource = myDataSet.Tables(0)
        DataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells