form2.frm

很多的vb经典源代码

VERSION 5.00
Begin VB.Form Form2 
   BorderStyle     =   3  'Fixed Dialog
   Caption         =   "查询条件构成器"
   ClientHeight    =   2295
   ClientLeft      =   45
   ClientTop       =   330
   ClientWidth     =   6525
   LinkTopic       =   "Form2"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   2295
   ScaleWidth      =   6525
   ShowInTaskbar   =   0   'False
   StartUpPosition =   2  '屏幕中心
   Begin VB.CommandButton Command1 
      Caption         =   "取消"
      Height          =   375
      Left            =   3720
      TabIndex        =   9
      Top             =   1800
      Width           =   1215
   End
   Begin VB.Frame Frame1 
      Caption         =   "查询条件表达式："
      Height          =   615
      Left            =   240
      TabIndex        =   7
      Top             =   960
      Width           =   6135
      Begin VB.Label Labvalue 
         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            =   4080
         TabIndex        =   11
         Top             =   240
         Width           =   1935
      End
      Begin VB.Label Laboperate 
         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            =   2040
         TabIndex        =   10
         Top             =   240
         Width           =   1815
      End
      Begin VB.Label Labfield 
         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            =   240
         TabIndex        =   8
         Top             =   240
         Width           =   1575
      End
   End
   Begin VB.CommandButton CmdOk 
      Caption         =   "确定(&O)"
      Height          =   375
      Left            =   2160
      TabIndex        =   6
      Top             =   1800
      Width           =   1215
   End
   Begin VB.ComboBox Combo3 
      Height          =   300
      Left            =   4560
      TabIndex        =   4
      Top             =   480
      Width           =   1815
   End
   Begin VB.ComboBox Combo2 
      Height          =   300
      Left            =   2520
      Style           =   2  'Dropdown List
      TabIndex        =   3
      Top             =   480
      Width           =   1695
   End
   Begin VB.ComboBox Combo1 
      Height          =   300
      Left            =   240
      Style           =   2  'Dropdown List
      TabIndex        =   2
      Top             =   480
      Width           =   1575
   End
   Begin VB.Label Label3 
      Caption         =   "查询值："
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   210
      Left            =   4560
      TabIndex        =   5
      Top             =   120
      Width           =   840
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      Caption         =   "选择关系运算符："
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   210
      Left            =   2520
      TabIndex        =   1
      Top             =   120
      Width           =   1680
   End
   Begin VB.Label Label1 
      Caption         =   "选择查询字段："
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   210
      Left            =   240
      TabIndex        =   0
      Top             =   120
      Width           =   1530
   End
End
Attribute VB_Name = "Form2"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit


Private Sub CmdOk_Click()
   Dim Fieldname, operate, value As String
   Select Case Combo2.ListIndex
          Case 0
              operate = "="
          Case 1
              operate = ">="
          Case 2
              operate = ">"
          Case 3
              operate = "<"
          Case 4
              operate = "<="
          Case 5
              operate = "<>"
    End Select
    Fieldname = Combo1.Text
    value = Combo3.Text
    Select Case Combo1.ListIndex
          Case 0, 1, 2, 7
             FindString = Fieldname & operate & "'" & value & "'"
          Case 3, 4, 6
             FindString = Fieldname & operate & value
          Case 5
             FindString = Fieldname & operate & "#" & value & "#"
        
      End Select
      
      



   Unload Form2
   
End Sub

Private Sub Combo1_Click()
   Labfield.Caption = Combo1.Text
End Sub

Private Sub Combo2_Click()
   Dim Temp As String
   Select Case Combo2.ListIndex
          Case 0
              Temp = "="
          Case 1
              Temp = ">="
          Case 2
              Temp = ">"
          Case 3
              Temp = "<"
          Case 4
              Temp = "<="
          Case 5
              Temp = "<>"
    End Select
    Laboperate.Caption = Temp
End Sub

Private Sub Combo3_Change()
   Labvalue.Caption = Combo3.Text
End Sub

Private Sub Combo3_Click()
    Labvalue.Caption = Combo3.Text
End Sub

Private Sub Combo3_KeyPress(KeyAscii As Integer)
    If KeyAscii = 13 Then
        Labvalue.Caption = Combo3.Text
    End If
End Sub

Private Sub Command1_Click()
   cancelFlag = True
   Unload Me
End Sub

Private Sub Form_Load()
    
    Dim num As Integer
    For num = 0 To Form1.Data1.Recordset.Fields.Count - 1
        Combo1.AddItem Form1.Data1.Recordset.Fields(num).Name
    Next num
    '---
    Combo2.AddItem "等于（=）"
    Combo2.AddItem "大于或等于（>=）"
    Combo2.AddItem "大于（>）"
    Combo2.AddItem "小于（<）"
    Combo2.AddItem "小于或等（<=）"
    Combo2.AddItem "不等于（<>）"
    '--
    Combo1.ListIndex = 1
    Combo2.ListIndex = 0
    '--
    Combo3.AddItem "H001"
    Combo3.AddItem "H002"
    Combo3.AddItem "H003"
    Combo3.AddItem "H004"
End Sub