frmlogin.frm

客户关系管理系统(打包+源程序)是数据库系统开发项目方案精解系列丛书VB数据库管理中附带CD中的程序

VERSION 5.00
Begin VB.Form frmLogin 
   BorderStyle     =   4  'Fixed ToolWindow
   Caption         =   "供应商与客户关系管理"
   ClientHeight    =   4365
   ClientLeft      =   45
   ClientTop       =   285
   ClientWidth     =   7110
   LinkTopic       =   "Form1"
   LockControls    =   -1  'True
   MaxButton       =   0   'False
   MinButton       =   0   'False
   Picture         =   "frmLogin.frx":0000
   ScaleHeight     =   4365
   ScaleWidth      =   7110
   StartUpPosition =   2  '屏幕中心
   Begin VB.TextBox NowPwd 
      Height          =   330
      IMEMode         =   3  'DISABLE
      Left            =   4200
      PasswordChar    =   "*"
      TabIndex        =   1
      Text            =   "admin"
      Top             =   1695
      Width           =   1935
   End
   Begin VB.TextBox NowUser 
      Height          =   330
      Left            =   4200
      TabIndex        =   0
      Text            =   "admin"
      Top             =   1200
      Width           =   1935
   End
   Begin VB.CommandButton Command1 
      Caption         =   "确定"
      Default         =   -1  'True
      Height          =   330
      Left            =   3435
      TabIndex        =   2
      Top             =   2295
      Width           =   1095
   End
   Begin VB.CommandButton Command2 
      Caption         =   "取消"
      Height          =   330
      Left            =   4995
      TabIndex        =   3
      Top             =   2295
      Width           =   1095
   End
   Begin VB.Label Label6 
      BackStyle       =   0  'Transparent
      Caption         =   "销售客户信息管理"
      BeginProperty Font 
         Name            =   "华文琥珀"
         Size            =   18
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   -1  'True
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H00FFFF80&
      Height          =   495
      Left            =   1320
      TabIndex        =   9
      Top             =   3000
      Width           =   3135
   End
   Begin VB.Label Label5 
      BackStyle       =   0  'Transparent
      Caption         =   "客户服务信息"
      BeginProperty Font 
         Name            =   "华文琥珀"
         Size            =   18
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   -1  'True
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H00FFFF80&
      Height          =   495
      Left            =   4440
      TabIndex        =   8
      Top             =   3600
      Width           =   2655
   End
   Begin VB.Label Label4 
      BackStyle       =   0  'Transparent
      Caption         =   "供应商信息管理"
      BeginProperty Font 
         Name            =   "华文琥珀"
         Size            =   18
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   -1  'True
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H00FFFF80&
      Height          =   495
      Left            =   360
      TabIndex        =   7
      Top             =   1920
      Width           =   2775
   End
   Begin VB.Label Label2 
      Alignment       =   2  'Center
      BackColor       =   &H8000000A&
      BackStyle       =   0  'Transparent
      Caption         =   "密  码："
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   255
      Left            =   3240
      TabIndex        =   6
      Top             =   1755
      Width           =   1215
   End
   Begin VB.Label Label1 
      Alignment       =   2  'Center
      BackColor       =   &H8000000A&
      BackStyle       =   0  'Transparent
      Caption         =   "用户名："
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   255
      Left            =   3240
      TabIndex        =   5
      Top             =   1260
      Width           =   1215
   End
   Begin VB.Label Label3 
      Alignment       =   2  'Center
      Appearance      =   0  'Flat
      BackColor       =   &H80000005&
      BackStyle       =   0  'Transparent
      Caption         =   "客户关系管理系统"
      BeginProperty Font 
         Name            =   "华文彩云"
         Size            =   24
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H0000FFFF&
      Height          =   615
      Left            =   2640
      TabIndex        =   4
      Top             =   360
      Width           =   4095
   End
End
Attribute VB_Name = "frmLogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Private Sub Command1_Click()
    Dim CnnBool As Boolean      '判断数据库连接是否成功
    Dim Rst As New ADODB.Recordset
    Dim strSQL As String
    Dim rstCount As Integer     '记录数据集中记录条数
    
On Error GoTo ErrorExit         '错误处理
    If NowUser.Text = "" Then   '登录名不能为空
        MsgBox "请输入登录者用户名。", vbExclamation, Me.Caption
        Me.NowUser.SetFocus
        Exit Sub
    End If
    Screen.MousePointer = vbHourglass
    CnnBool = ConnectDB      '连接数据库
    If CnnBool = False Then  '数据库连接失败
        Unload Me
        Exit Sub
    End If
    
    strSQL = "SELECT * FROM tb_Login WHERE LoginID ='" & NowUser.Text & "'"
    Rst.Open strSQL, CnnDatabase, adOpenDynamic, adLockReadOnly  '执行选取记录集的SQL语句
    rstCount = 0
    Do While Rst.EOF = False  '计算记录集中记录数
        rstCount = rstCount + 1
        Rst.MoveNext
    Loop
    If rstCount = 0 Then     '判断用户名是否存在：记录集中记录应不为0条
        MsgBox "无此用户！"
        CnnDatabase.Close    '关闭数据库
        Screen.MousePointer = vbDefault
        Me.NowUser.Text = ""
        Me.NowPwd.Text = ""
        Me.NowUser.SetFocus
        Exit Sub
    End If
    If Rst.RecordCount > 1 Then '记录集中记录数不唯一
        MsgBox "数据库错误：用户有重复！"
        CnnDatabase.Close       '关闭数据库
        Screen.MousePointer = vbDefault
        Unload Me               '关闭系统
        Exit Sub
    End If
    Rst.MoveFirst
    If IsNull(Rst.Fields("LoginPwd").Value) Then     '判断用户密码是否正确
        If NowPwd.Text <> "" Then
            MsgBox "用户密码不正确！"
            CnnDatabase.Close
            Screen.MousePointer = vbDefault
            Me.NowPwd.Text = ""
            Me.NowPwd.SetFocus
            Exit Sub
        End If
    Else
        If NowPwd.Text <> Rst.Fields("LoginPwd").Value Then
            MsgBox "用户密码不正确！"
            CnnDatabase.Close
            Screen.MousePointer = vbDefault
            Me.NowPwd.Text = ""
            Me.NowPwd.SetFocus
            Exit Sub
        End If
    End If
    
    strNowUser = Rst.Fields("UserName").Value   '记下当前登录的用户名
    Screen.MousePointer = vbDefault
    Set Rst = Nothing       '关闭动态的记录集
    Unload Me               '关闭当前窗口
    frmMDIMain.Show         '显示主窗口
    Exit Sub
ErrorExit:
    Screen.MousePointer = vbDefault
    MsgBox Err.Description, vbInformation, Me.Caption
    Set Rst = Nothing       '关闭记录集
    Set CnnDatabase = Nothing       '关闭数据库
    Unload Me
End Sub

Private Sub Command2_Click()
    Unload Me
End Sub

Private Sub Form_Load()
    Me.Height = 4700
    Me.Width = 7200
End Sub