结果有两个条件 [英] Two condition in result

问题描述

Dim a As String() = {"247.032", "247.038", "009.549", "009.452", "010.328", "009.901", "009.902", "009.948", "247.020", "008.540", "008.978", "009.236", "", "007.821", "007.823", "008.309", "008.310", "008.313", "008.314", "008.472", "008.473", "008.482", "007.821", "008.481", "008.306", "008.307", "010.740", "009.274", "009.275", "007.520", "007.620", "963.709", "007.850"}
            Dim b As String = "5"
            Dim t As String = regCis

            Dim result = a.Any(Function(x) t.StartsWith(x) AndAlso t.EndsWith(b))
            If result = True Then

                provider = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source ="
                dataFile = "sdf.accdb" ' Change it to your Access Database location
                connString = provider & dataFile
                Dim command As New OleDbCommand("SELECT * FROM Log WHERE [Zákaznické číslo] = '" & TextBox2.Text & "'")
                Dim cnn As New OleDbConnection(connString)
                command.Connection = cnn
                Try
                    cnn.Open()
                Catch
                    MsgBox("Připojení k databázi se nezdařilo.", , "Chyba")
                End Try
                dr = command.ExecuteReader

                If dr.HasRows And t.EndsWith(b) = True Then
                    MsgBox("Čárový kód byl již skenován " & TextBox2.Text, , "Chyba")
                    TextBox2.Clear()
                    tiskEtiketaBut.BackColor = Color.DimGray
                    tiskEtiketaBut.Enabled = True
                    TextBox2.Select()
                    myConnection.Close()

                Else

W帽子我试过了：



这是我的代码，我想在其他的hashrows之后粘贴其他条件。我该怎么做？谢谢。



如果结果为真，那么如果扫描了数字，则下一个条件会查找数据库。现在我想发送其他结果，否则为hashrows。

What I have tried:

Here is my code, I would like to paste else condition for result behind else of hashrows . How can I do it? Thank you.

If result is true then next condition look to database if number was scanned. And now I want send else for result and else for hashrows.

推荐答案

Dim command As New OleDbCommand("SELECT * FROM Log WHERE [Zákaznické číslo] = '" & TextBox2.Text & "'")

不是你问题的解决方案，而是你遇到的另一个问题。

永远不要通过连接字符串来构建SQL查询。迟早，您将使用用户输入来执行此操作，这会打开一个名为SQL注入的漏洞，这对您的数据库很容易并且容易出错。

名称中的单引号你的程序崩溃。如果用户输入像Brian O'Conner这样的名称可能会使您的应用程序崩溃，那么这是一个SQL注入漏洞，崩溃是最少的问题，恶意用户输入，并且它被提升为具有所有凭据的SQL命令。

SQL注入 - 维基百科 [ ^ ]

SQL注入 [ ^ ]

按示例进行SQL注入攻击 [ ^ ]

PHP：SQL注入 - 手册 [ ^ ]

SQL注入预防备忘单 - OWASP [ ^ ]

我该怎么办？解释没有技术术语的SQL注入？ - 信息安全堆栈交换 [ ^ ]

Not a solution to your question, but another problem you have.
Never build an SQL query by concatenating strings. Sooner or later, you will do it with user inputs, and this opens door to a vulnerability named "SQL injection", it is dangerous for your database and error prone.
A single quote in a name and your program crash. If a user input a name like "Brian O'Conner" can crash your app, it is an SQL injection vulnerability, and the crash is the least of the problems, a malicious user input and it is promoted to SQL commands with all credentials.
SQL injection - Wikipedia[^]
SQL Injection[^]
SQL Injection Attacks by Example[^]
PHP: SQL Injection - Manual[^]
SQL Injection Prevention Cheat Sheet - OWASP[^]
How can I explain SQL injection without technical jargon? - Information Security Stack Exchange[^]

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