Private Sub Command1_Click() sqlstring1 = "select 零件信息.零件代码,零件名称,库存量 " sqlstring2 = "from 零件信息 where 零件代码=" & CInt(deptno) sqlstring = sqlstring1 & sqlstring2 main.Adodc1.RecordSource = sqlstring main.Adodc1.Refresh Set DataGrid1.DataSource = main.Adodc1 DataGrid1.Refresh End Sub
时间: 2024-02-19 20:01:37 浏览: 61
这是一个 Visual Basic 6.0 的代码段,功能是从一个名为“零件信息”的表中查询指定零件代码的零件名称和库存量,并将结果显示在一个名为“DataGrid1”的数据表格控件中。其中,变量“deptno”为指定的零件代码。这段代码使用了 ADO 数据库连接组件,通过执行 SQL 查询语句来获取数据。
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Option Compare Database Option Explicit Public a1 As Integer Public idnum As Long Dim rs1 As DAO.Recordset '定义记录集变量 Private Sub Command抽奖1_Click() If a1 = 1 Then a1 = 0 rs1.Close Else a1 = 1 Set rs1 = CurrentDb.OpenRecordset("奖励表", dbOpenTable) End If End Sub Private Sub Command抽奖2_Click() If a1 = 1 Then a1 = 0 rs1.Close DoCmd.SetWarnings (False) Dim del_sql As String del_sql = "Delete From 奖励表 Where ID=" & idnum DoCmd.RunSQL del_sql Else a1 = 1 Set rs1 = CurrentDb.OpenRecordset("奖励表", dbOpenTable) End If End Sub Private Sub Command重置_Click() DoCmd.SetWarnings (False) Dim del_sql As String del_sql = "Delete From 奖励表" DoCmd.RunSQL del_sql Dim update_sql As String update_sql = "insert into 奖励表 select * From 奖励备份表" DoCmd.RunSQL update_sql End Sub Sub 抽奖1() On Error GoTo 抽奖完成 If a1 = 1 Then Dim Record_count As Long Record_count = rs1.RecordCount Dim rnd_i As Long Randomize rnd_i = Int((Record_count - 1 + 1) * Rnd + 1) rs1.MoveFirst rs1.Move (rnd_i - 1) Me.奖励 = rs1.Fields("奖励名称").Value idnum = rs1.Fields("ID").Value End If Exit Sub 抽奖完成: MsgBox "抽奖完成,重新抽奖可重置" a1 = 0 rs1.Close End Sub Private Sub Form_Timer() If a1 = 1 Then Call 抽奖1 End If End Sub打开窗体之后点击抽奖按钮,但是奖励框中不显示奖励名称是为什么
根据提供的代码,可能是因为在抽奖1()子过程中,没有将抽中的奖励名称赋值给奖励框的属性。可以在抽奖1()子过程中添加一行代码,将抽中的奖励名称赋值给奖励框的属性,例如:
```
Me.奖励 = rs1.Fields("奖励名称").Value
```
其中,"奖励"是奖励框的属性名称,需要根据实际情况进行修改。
另外,建议在使用记录集变量时,先判断记录集是否已经打开,以避免出现异常情况。例如,在Command抽奖2_Click()子过程中,可以添加以下代码:
```
If rs1.State = adStateOpen Then
rs1.Close
End If
```
这样可以确保每次操作前记录集都已经关闭。
Private Sub Command1_Click() Set mycon = New ADODB.Connection mycon.Open "dsn=my", "sa" Set myres2 = New ADODB.Recordset myres2.Open "select * from user where " &用户名& " = "' & Text1.Text & " and " &密码& " = '" & Text2.Text & "'" , mycon, adOpenDynamic, adLockOptimistic If myres2.BOF And myres1.EOF Then Form2.Hide Form1.Show Else Dim res As Integer res = MsgBox("用户名或密码错误", vbExclamation + vb重新输入Cancel + vbDefaultButton2) Text1.Text = " " Text2.Text = " " End If End Sub 这个代码哪里有错误
这段代码有两个错误:
1. 第4行代码 myres2.Open 中的 myres1 应该改为 myres2,即:
```
myres2.Open "select * from user where " & 用户名 & " = '" & Text1.Text & "' and " & 密码 & " = '" & Text2.Text & "'", mycon, adOpenDynamic, adLockOptimistic
```
2. 第6行代码中,应该使用 myres2.RecordCount 而不是 myres2.BOF 和 myres1.EOF 判断记录是否为空。即:
```
If myres2.RecordCount = 0 Then
```
修改后的代码如下:
```
Private Sub Command1_Click()
Set mycon = New ADODB.Connection
mycon.Open "dsn=my", "sa"
Set myres2 = New ADODB.Recordset
myres2.Open "select * from user where " & 用户名 & " = '" & Text1.Text & "' and " & 密码 & " = '" & Text2.Text & "'", mycon, adOpenDynamic, adLockOptimistic
If myres2.RecordCount = 0 Then
Form2.Hide
Form1.Show
Else
Dim res As Integer
res = MsgBox("用户名或密码错误", vbExclamation + vb重新输入Cancel + vbDefaultButton2)
Text1.Text = ""
Text2.Text = ""
End If
End Sub
```