需要在数据库中搜索标准是日期字段 [英] Need to search in a database whille the criteria is a date field

问题描述

大家好，



我需要您的紧急帮助解决以下问题..



我正在尝试使用Access表填充DataGridView，但所选数据保持以下多个条件，问题是它没有正确导致错误MSG出现



以下代码需要解决..



PS：如果我删除日期部分查询得到正确执行但我需要紧急的日期标准plz

Hi All,

please i need your urgent help in solving the below problem..

I'm trying to fill a DataGridView with Access table but the selected data holding the below multiple criteria , the problem that it didn't results correctly as an error MSG appeared

below codes needs to be solved please..

P.S: if i removed the date section the query got executed correctly but i need the date criteria urgently plz

Private Sub Supplier_Query()
        Dim Yesterday As DateTime = DateTime.Today.AddDays(-1)
        cnnOLEDB.ConnectionString = strConnectionString
        cnnOLEDB.Open()
        'Dim strUpdate As String
        Try
            Dim sqlQRY As String
            sqlQRY = "Select * From Customers WHERE SupplierName = '" & SuppNameVariable.Text & "' AND SupplierFeedbackDate = '.... / .... / .....' AND DateAdded <'" & CDate(Yesterday) & "'"
            Dim da As OleDbDataAdapter
            Dim ds As DataSet = New DataSet
            da = New OleDbDataAdapter(sqlQRY, cnnOLEDB)
            Dim cb As OleDbCommandBuilder = New OleDbCommandBuilder(da)
            da.Fill(ds, "Customers")
            Alerting_Escalation_Tool.DataGridViewCustomer.DataSource = ds
            Alerting_Escalation_Tool.DataGridViewCustomer.DataMember = "Customers"
        Catch ex As OleDbException
            MsgBox(ex.ToString)
        End Try
        cnnOLEDB.Close()
End  Sub()

推荐答案

从一开始你的方法就错了。通过串联从UI获取的字符串组成的查询。不仅重复的字符串连接是低效的（因为字符串是不可变的;我是否必须解释为什么它会使重复连接变坏？），但是有更重要的问题：它打开了通向良好的大门已知的漏洞称为 SQL注入。



这是它的工作原理： http://xkcd.com/327 。



你明白了吗？从控件中获取的字符串可以是任何东西，包括......一段SQL代码。



怎么办？只需阅读有关此问题和主要补救措施：参数化语句： http://en.wikipedia.org/ wiki / SQL_injection 。



使用ADO.NET，使用：http://msdn.microsoft.com/en-us/library/ff648339.aspx 。



请参阅我过去的答案有更多细节：

在com.ExecuteNonQuery中更新EROR（ ）; ，

嗨姓名不显示？。

-SA

Your approach is wrong from the very beginning. The query composed by concatenation with strings taken from UI. Not only repeated string concatenation is inefficient (because strings are immutable; do I have to explain why it makes repeated concatenation bad?), but there is way more important issue: it opens the doors to a well-known exploit called SQL injection.

This is how it works: http://xkcd.com/327.

Are you getting the idea? The string taken from a control can be anything, including… a fragment of SQL code.

What to do? Just read about this problem and the main remedy: parametrized statements: http://en.wikipedia.org/wiki/SQL_injection.

With ADO.NET, use this: http://msdn.microsoft.com/en-us/library/ff648339.aspx.

Please see my past answers for some more detail:
EROR IN UPATE in com.ExecuteNonQuery();,
hi name is not displaying in name?.

—SA

这就是我修复它的方式..



以及DateAdded字段在数据库设计中保存日期类型的方式



sqlQRY =选择*来自客户WHERE SupplierName ='&SuppNameVariable.Text&'AND SupplierFeedbackDate ='.... / .... / .....'和DateAdded< ＃+昨天+＃



谢谢大家

问候

Bassam

This is how i fixed it..

and by the way the field DateAdded holds Date Type in data base design

sqlQRY = "Select * From Customers WHERE SupplierName = '" & SuppNameVariable.Text & "' AND SupplierFeedbackDate = '.... / .... / .....' AND DateAdded < #" + Yesterday + "#"

Thanks guys
Regards
Bassam

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