gridlister.frm

VB6数据库开发指南》的配套源程序

VERSION 5.00
Object = "{00028C01-0000-0000-0000-000000000046}#1.0#0"; "DBGRID32.OCX"
Begin VB.Form Form1 
   BackColor       =   &H00C0C0C0&
   Caption         =   "Grid Lister"
   ClientHeight    =   3150
   ClientLeft      =   1440
   ClientTop       =   2325
   ClientWidth     =   6420
   BeginProperty Font 
      Name            =   "MS Sans Serif"
      Size            =   8.25
      Charset         =   0
      Weight          =   700
      Underline       =   0   'False
      Italic          =   0   'False
      Strikethrough   =   0   'False
   EndProperty
   LinkTopic       =   "Form1"
   PaletteMode     =   1  'UseZOrder
   ScaleHeight     =   3150
   ScaleWidth      =   6420
   Begin VB.TextBox txtProductId 
      DataField       =   "ProductID"
      DataSource      =   "datProducts"
      Enabled         =   0   'False
      Height          =   285
      Left            =   3960
      TabIndex        =   5
      Top             =   360
      Width           =   1455
   End
   Begin VB.TextBox txtUnitsInStock 
      DataField       =   "UnitsInStock"
      DataSource      =   "datProducts"
      Enabled         =   0   'False
      Height          =   285
      Left            =   2400
      TabIndex        =   4
      Top             =   360
      Width           =   1335
   End
   Begin VB.Data datOrderDetails 
      Caption         =   "Order Details"
      Connect         =   "Access"
      DatabaseName    =   "D:\Program Files\Microsoft Visual Studio\VB6\Nwind.mdb"
      DefaultCursorType=   0  'DefaultCursor
      DefaultType     =   2  'UseODBC
      Exclusive       =   0   'False
      Height          =   465
      Left            =   3720
      Options         =   0
      ReadOnly        =   0   'False
      RecordsetType   =   1  'Dynaset
      RecordSource    =   "Order Details"
      Top             =   2640
      Visible         =   0   'False
      Width           =   2535
   End
   Begin VB.TextBox txtProductName 
      DataField       =   "ProductName"
      DataSource      =   "datProducts"
      Enabled         =   0   'False
      Height          =   285
      Left            =   120
      MultiLine       =   -1  'True
      TabIndex        =   0
      Top             =   360
      Width           =   2055
   End
   Begin VB.Data datProducts 
      Caption         =   "Products"
      Connect         =   "Access"
      DatabaseName    =   "D:\Program Files\Microsoft Visual Studio\VB6\Nwind.mdb"
      DefaultCursorType=   0  'DefaultCursor
      DefaultType     =   2  'UseODBC
      Exclusive       =   0   'False
      Height          =   465
      Left            =   120
      Options         =   0
      ReadOnly        =   0   'False
      RecordsetType   =   1  'Dynaset
      RecordSource    =   "Products"
      Top             =   2640
      Width           =   2535
   End
   Begin MSDBGrid.DBGrid dbgOrderDetails 
      Bindings        =   "GridLister.frx":0000
      Height          =   1575
      Left            =   120
      OleObjectBlob   =   "GridLister.frx":001A
      TabIndex        =   6
      Top             =   960
      Width           =   6255
   End
   Begin VB.Label Label3 
      Caption         =   "Product ID"
      Height          =   255
      Left            =   3960
      TabIndex        =   3
      Top             =   120
      Width           =   1575
   End
   Begin VB.Label Label2 
      Caption         =   "Units in Stock"
      Height          =   255
      Left            =   2400
      TabIndex        =   2
      Top             =   120
      Width           =   1335
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      BackColor       =   &H00C0C0C0&
      Caption         =   "Product Name:"
      Height          =   195
      Left            =   120
      TabIndex        =   1
      Top             =   120
      Width           =   1275
   End
   Begin VB.Menu mnuFile 
      Caption         =   "&File"
      Begin VB.Menu mnuFileExit 
         Caption         =   "E&xit"
      End
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Private Sub datProducts_Reposition()
    Dim strSql As String
    
    If datProducts.Recordset.RecordCount = 0 Then
    
        ' Don't re-query the Order Details if there are
        ' no products displayed.
        Exit Sub
    End If

    ' Re-query the Order Detail grid by SQL SELECT statement.
    ' The WHERE clause picks up only the order details for
    ' the displayed product.
    strSql = "SELECT * FROM [Order Details] WHERE ProductID = " _
        & datProducts.Recordset.Fields("ProductID")
    
    ' Assign the desired SQL statement as the record source.
    datOrderDetails.RecordSource = strSql
    
    ' Re-query the database to bring new data to the recordset
    datOrderDetails.Refresh
    
    ' Set the default value for ProductID for any possible future
    ' Order Details inserts to the displayed product ID.
    dbgOrderDetails.Columns("ProductID").DefaultValue = _
        datProducts.Recordset.Fields("ProductID")
    
End Sub

Private Sub mnuFileExit_Click()
    
    Unload Me

End Sub