(5) 查询子窗体代码
查询子窗体是用来查询库房中图书资料明细的。其运行效果如图41所示。
图41 查询子窗体运行效果
在列表框中给出编号或年月日后，“查询”按钮的Click事件将给出与数据库查找比较的结果。
Private Sub Command1_Click()
On Error GoTo cmderror
Dim find_date1 As String
Dim find_date2 As String
If Option1.Value = True Then
sqlfind = "select * from 图书资料 where 编号 between '" & _
Combo1(0).Text & "'" & " and " & "'" & Combo1(1).Text & "'"
End If
If Option2.Value = True Then
find_date1 = Format(CDate(Comboy(0).Text & "-" & _
Combom(0).Text & "-" & Combod(0).Text), "yyyy-mm-dd")
find_date2 = Format(CDate(Comboy(1).Text & "-" & _
Combom(1).Text & "-" & Combod(1).Text), "yyyy-mm-dd")
sqlfind = "select * from 图书资料 where 购买日期 between #" & _
find_date1 & "#" & " and" & " #" & find_date2 & "#"
End If
rs_data1.Open sqlfind, conn, adOpenKeyset, adLockPessimistic
frmdatamanage.displaygrid1
Unload Me
cmderror:
If Err.Number <> 0 Then
MsgBox Err.Description
End If
End Sub
运行查询子窗体时，组合框中就已经从数据库中提取了货单号和年月日两个待查条件。
Dim i As Integer
Dim sql As String
If findok = True Then
rs_data1.Close
End If
sql = "select * from 图书资料 order by 编号 desc"
rs_find.CursorLocation = adUseClient
rs_find.Open sql, conn, adOpenKeyset, adLockPessimistic
If rs_find.EOF = False Then ' 添加编号
With rs_find
Do While Not .EOF
Combo1(0).AddItem .Fields(0)
Combo1(1).AddItem .Fields(0)
.MoveNext
Loop
End With
End If
For i = 2001 To 2005 ' 添加年
Comboy(0).AddItem i
Comboy(1).AddItem i
Next i
For i = 1 To 12 ' 添加月
Combom(0).AddItem i
Combom(1).AddItem i
Next i
For i = 1 To 31 ' 添加日
Combod(0).AddItem i
Combod(1).AddItem i
Next i
End Sub
查询完毕后，输出查询结果，如图42所示。
图42 查询结果
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