怎样在Datagrid中显示查询结果？

用什么连接数据库？

还有就是单击“查询”按钮，就在datagrid中显示查询结果，查询按钮的单击事件怎么写

Adodc1.RecordSource

Option Explicit
Dim px As Boolean




Private Sub cmdFirst_Click() '第一条
  Adodc1.Recordset.MoveFirst
  Tongbu
End Sub

Private Sub cmdLast_Click() '最后一条
 Adodc1.Recordset.MoveLast
 Tongbu
End Sub



Private Sub cmdNext_Click() '下一条
  Adodc1.Recordset.MoveNext
  If Adodc1.Recordset.EOF Then Adodc1.Recordset.MoveLast
  Tongbu
End Sub

Private Sub cmdPrevious_Click() '上一条
  Adodc1.Recordset.MovePrevious
  If Adodc1.Recordset.BOF Then Adodc1.Recordset.MoveFirst
  Tongbu
End Sub




Private Sub cmdQue_Click()
Dim connstring As String
  connstring = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=G:\VB编程\familyIO.mdb;Persist Security Info=False"
  Adodc1.ConnectionString = connstring
   = adCmdText
  Adodc1.RecordSource = "select * from out where '" & Combo1.Text & "'" & " like '" & gjzText.Text & "'"
  DataGrid1.DataSource = Adodc1
  Adodc1.Refresh
  
  DataGrid1.Columns(1) = Adodc1.Recordset.Fields("1")
  DataGrid1.Columns(2) = Adodc1.Recordset.Fields("2")
  DataGrid1.Columns(3) = Adodc1.Recordset.Fields("3")
  DataGrid1.Columns(4) = Adodc1.Recordset.Fields("4")
  DataGrid1.Columns(5) = Adodc1.Recordset.Fields("5")
  DataGrid1.Columns(6) = Adodc1.Recordset.Fields("6")
  DataGrid1.Columns(7) = Adodc1.Recordset.Fields("7")
  DataGrid1.Columns(8) = Adodc1.Recordset.Fields("8")
  DataGrid1.Columns(9) = Adodc1.Recordset.Fields("9")
  DataGrid1.Columns(10) = Adodc1.Recordset.Fields("10")
  DataGrid1.Columns(11) = Adodc1.Recordset.Fields("11")
  DataGrid1.Columns(12) = Adodc1.Recordset.Fields("12")
  DataGrid1.Columns(13) = Adodc1.Recordset.Fields("13")
  DataGrid1.Columns(14) = Adodc1.Recordset.Fields("14")
  DataGrid1.Columns(15) = Adodc1.Recordset.Fields("15")
  DataGrid1.Columns(16) = Adodc1.Recordset.Fields("16")
  DataGrid1.Columns(17) = Adodc1.Recordset.Fields("17")
  DataGrid1.Columns(18) = Adodc1.Recordset.Fields("18")

  
DataGrid1.Columns(0).Width = 500 '设置datagrid1控件列宽
DataGrid1.Columns(1).Width = 1000
DataGrid1.Columns(2).Width = 800
DataGrid1.Columns(3).Width = 600
DataGrid1.Columns(4).Width = 800
DataGrid1.Columns(5).Width = 600
DataGrid1.Columns(6).Width = 800
DataGrid1.Columns(7).Width = 600
DataGrid1.Columns(8).Width = 800
DataGrid1.Columns(9).Width = 600
DataGrid1.Columns(10).Width = 800
DataGrid1.Columns(11).Width = 600
DataGrid1.Columns(12).Width = 800
DataGrid1.Columns(13).Width = 600
DataGrid1.Columns(14).Width = 800
DataGrid1.Columns(15).Width = 600
DataGrid1.Columns(16).Width = 1000
DataGrid1.Columns(17).Width = 800
DataGrid1.Columns(18).Width = 800
  If Adodc1.Recordset.EOF Then MsgBox "没有查找到结果！", , "查询提示"

   
End Sub

Private Sub DataGrid1_HeadClick(ByVal ColIndex As Integer)
  px = Not px
  If px Then
    Adodc1.Recordset.Sort = DataGrid1.Columns(ColIndex).DataField & " asc" '单击字段标题自动升序
  Else
    Adodc1.Recordset.Sort = DataGrid1.Columns(ColIndex).DataField & " desc" '单击字段标题自动降序
  End If
End Sub

Private Sub DataGrid1_RowColChange(LastRow As Variant, ByVal LastCol As Integer)
 If Adodc1.Recordset.BOF Then Adodc1.Recordset.MoveFirst
 If Adodc1.Recordset.EOF Then Adodc1.Recordset.MoveLast
 Tongbu
End Sub

Private Sub Form_Load()
Dim connstring As String
  connstring = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=G:\VB编程\familyIO.mdb;Persist Security Info=False"
  Adodc1.ConnectionString = connstring
   = adCmdText
  Adodc1.RecordSource = "select * from out where '" & Combo1.Text & "'" & " like '" & gjzText.Text & "'"
  Adodc1.Refresh
  Set DataGrid1.DataSource = Adodc1


Adodc1.Recordset.Sort = DataGrid1.Columns(1).DataField
Adodc1.Recordset.MoveLast
px = False

Combo1.AddItem ("日期")
Combo1.AddItem ("水果类")
Combo1.AddItem ("其他辅食类")
Combo1.AddItem ("生活用品类")
Combo1.AddItem ("衣物类")
Combo1.AddItem ("交通类")
Combo1.AddItem ("通信类")
Combo1.AddItem ("娱乐文化类")
Combo1.AddItem ("其他类")
DataGrid1.Enabled = False
'Combo1.ListIndex = 0
End Sub

（总结）要想将查询结果显示在Datagrid中，须注意以下几点：
1.select查询语句中where后的字段及其值不能同时使用变量，不然提示出错，改为：字段为常量，用select语句分情况select语句 解决，“ like '% 查询变量 %'”实现模糊查询
2.执行查询语句后，如果查询文本型字段的值为空，则提示NULL错误，解决方法：打开数据库，将其字段的“必填”选“是”；默认为“ ”。

好好学习，天天向上~~~