VB operation ACCESS example exercises--ATM cash machine code snippet-C#.Net Tutorial-php.cn

VB operation ACCESS example exercises--ATM cash machine code snippet

黄舟

Release： 2017-03-02 11:33:14

Original

1564 people have browsed it

====================================
General
==== ================================
Connect to the database (just splice the connection database string and call the function):

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()

Copy after login

Verify username and password (that is, take the username and password entered on the interface and match it in the database. If it can be found, pass):

 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()

Copy after login

    &#39;验证一下用户名密码是否存在
        Dim strSql As String = "select * from AccountInfo where AccountNo = &#39;" & _
       Trim(TextBox1.Text) & "&#39; and Password = &#39;" & Trim(TextBox2.Text) & "&#39;"
        Dim connCommand As OleDb.OleDbCommand = New OleDb.OleDbCommand(strSql, connConnection)
        Dim myReader As OleDb.OleDbDataReader = connCommand.ExecuteReader


        &#39;如果有数据
        If myReader.HasRows Then
            myReader.Read() &#39;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()
        &#39;没数据直接返回错误
        Return False

    End Function

Copy after login

Exit (actually Just hide all open windows and display the login window):

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

Copy after login

====================== ==============
Customer
============================== =======
Withdrawal:

 '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()

Copy after login

Deposit:

'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()

Copy after login

Account inquiry:

'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()

Copy after login

=== ================================
admin
========== ========================
Record operation log:

 sql = "insert into AccountAct (AccountNo,Lastopt,Amount) values (&#39;" & Trim(frmLogin.TextBox1.Text) & "&#39;,&#39;" & Trim(DateTime.Now.ToString()) & "&#39;,
 " & CType(TextBox1.Text, Integer) & ")"
        cmd = New OleDb.OleDbCommand(sql, connConnection)
        cmd.ExecuteNonQuery()


        connConnection.Close()

Copy after login

View all operation logs:

'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

Copy after login

View all user accounts

 '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

Copy after login

The above is the content of the VB operation ACCESS example practice question-ATM cash machine code segment. For more related content, please pay attention to the PHP Chinese website (www. php.cn)!