Question

我使用datagridview来显示学生记录..

我想显示按照旅店老板出生日期过滤的记录。

当我使用自定义格式datetimepicker从dd/mm选择11/09来搜索数据时，它没有显示任何内容。

如何在忽略年份的同时仅匹配dd / mm来显示所有记录？

这是我的代码：

Try
    con = New OleDbConnection(cs)
    con.Open()

    cmd = New OleDbCommand("SELECT HostelerID as [Hosteler ID],HostelerName as [Hosteler Name],DOB,HostelName as [Hostel Name],RoomNo as [Room No],DateOfJoining as [Date Of Joining],Purpose,FatherName as [Father's Name],MobNo1 as [Mobile No],Phone1 as [Phone No],MotherName as [Mother's Name],MobNo2 as [Mobile No 2],City,Address,Email,ContactNo as [Contact No],InstOfcDetails as [Ins/Ofc Details],Phone2 as [Phone No 2],Agreement,GuardianName as  [Guardian Name],GuardianAddress as [Guardian Address],MobNo3 as [Guardian Mobile No],Phone3 as [Guardian Phone No],FixedDeposit as [Fixed Deposit],CompletionDate as [Completion Date],Photo,DocsPic as [Docs Pic] from Hostelers where DOB like #" & DateTimePicker1.Text & "# order by HostelerName", con)

    Dim myDA As OleDbDataAdapter = New OleDbDataAdapter(cmd)
    Dim myDataSet As DataSet = New DataSet()

    myDA.Fill(myDataSet, "Hostelers")

    DataGridView6.DataSource = myDataSet.Tables("Hostelers").DefaultView

    con.Close()
Catch ex As Exception
    MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try

Answer 1

尝试将'where'子句更改为：

" WHERE MONTH(DOB) = " & DateTimePicker1.Value.Month &
      " AND DAY(DOB) = " & DateTimePicker1.Value.Day

但是我也强烈建议您使用参数化SQL命令 http://msdn.microsoft.com/en-us/library/system.data.oledb.oledbcommand.parameters.aspx

这将阻止SQL注入（http://technet.microsoft.com/en-us/library/ms161953(v=SQL.105).aspx）和其他错误

Answer 2

“使用自定义格式dd / mm从日期时间选择器中选择11/09来搜索数据”

在Access查询中，您可以要求数据库引擎将Format()应用于您的DOB值，然后进行比较。这样做可以用于静态值 '11 / 09' ...

WHERE Format(DOB, 'dd/mm') = '11/09'

为了使其灵活，您可以使用参数查询并提供DateTimePicker1.Text作为参数值。

WHERE Format(DOB, 'dd/mm') = your_string

Answer 3

将您的查询更改为以下内容：

cmd = New OleDbCommand("
SELECT HostelerID as [Hosteler ID], HostelerName as [Hosteler Name], 
    DOB, HostelName as [Hostel Name],
    RoomNo as [Room No], DateOfJoining as [Date Of Joining], 
    Purpose, FatherName as [Father's Name],
    MobNo1 as [Mobile No], Phone1 as [Phone No], 
    MotherName as [Mother's Name], MobNo2 as [Mobile No 2],
    City, Address, Email, ContactNo as [Contact No], 
    InstOfcDetails as [Ins/Ofc Details], Phone2 as [Phone No 2],
    Agreement, GuardianName as  [Guardian Name],
    GuardianAddress as [Guardian Address], MobNo3 as [Guardian Mobile No],
    Phone3 as [Guardian Phone No], FixedDeposit as [Fixed Deposit],
    CompletionDate as [Completion Date], Photo, DocsPic as [Docs Pic] 
FROM Hostelers 
WHERE (DatePart(\"M\", DOB) = '" + DateTimePicker1.Value.Date.Month + '")
  AND (DatePart(\"D\", DOB) = '" + DateTimePicker1.Value.Date.Day + '"))
ORDER BY HostelerName
")

如何使用日期搜索记录

3 个答案: