form1.frm

一个数据库打印的范例,比较简单

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   1275
   ClientLeft      =   1620
   ClientTop       =   1545
   ClientWidth     =   1995
   LinkTopic       =   "Form1"
   ScaleHeight     =   1275
   ScaleWidth      =   1995
   Begin VB.CommandButton Command1 
      Caption         =   "Print Data"
      Height          =   495
      Left            =   360
      TabIndex        =   0
      Top             =   360
      Width           =   1215
   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 MakeData()
Const NUM_POINTS = 40
Dim db As Database
Dim dbname As String
Dim i As Integer
Dim the_year As Date
Dim the_value As Single
Dim sql As String

    ' Open the database.
    dbname = App.Path
    If Right$(dbname, 1) <> "\" Then dbname = dbname & "\"
    dbname = dbname & "data.mdb"
    Set db = OpenDatabase(dbname)

    ' Delete any old data.
    sql = "DELETE FROM YearlyValues"
    db.Execute sql
    
    ' Create a bunch of data.
    the_year = #1/1/30#
    the_value = 1000
    Do While the_year <= #1/1/2020#
        sql = "INSERT INTO YearlyValues VALUES (#" & _
            Format$(the_year) & "#, " & _
            Format$(the_value) & ")"
        db.Execute sql
        
        the_year = DateAdd("yyyy", 1, the_year)
        the_value = the_value * (1 + Rnd * 0.2)
    Loop

    db.Close
End Sub


Private Sub Command1_Click()
' Use 1 inch margins.
Const TOP_MARGIN = 1440
Const LEFT_MARGIN = 1440

Dim bottom_margin As Single
Dim db As Database
Dim qdef As QueryDef
Dim rs As Recordset
Dim dbname As String
Dim the_year As Integer
Dim the_value As Integer

    MousePointer = vbHourglass
    DoEvents

    ' Open the database.
    dbname = App.Path
    If Right$(dbname, 1) <> "\" Then dbname = dbname & "\"
    dbname = dbname & "data.mdb"
    Set db = OpenDatabase(dbname)

    ' Get the records.
    Set qdef = db.CreateQueryDef("", _
        "SELECT Year, Value FROM YearlyValues")
    Set rs = qdef.OpenRecordset(dbOpenSnapshot)

    ' Read the data and print it.
    bottom_margin = Printer.ScaleTop + _
        Printer.ScaleHeight - 1440
    rs.MoveFirst
    
    Printer.CurrentY = TOP_MARGIN
    Do While Not rs.EOF
        ' Use rs!FieldName to get the data for
        ' the field named FieldName.
        Printer.CurrentX = LEFT_MARGIN
        Printer.Print _
            Format$(rs!Year, "yyyy") & _
            vbTab & _
            Format$(rs!Value, "0.0000")

        ' See if we have filled the page.
        If Printer.CurrentY >= bottom_margin Then
            ' Start a new page.
            Printer.NewPage
            Printer.CurrentY = TOP_MARGIN
        End If
        
        rs.MoveNext
    Loop

    rs.Close
    db.Close

    ' Finish printing.
    Printer.EndDoc

    MousePointer = vbDefault
End Sub