每次我需要按！在SQL Server中执行SQL命令

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问题描述

嗨朋友

我在vb.net中为insert命令编写代码，当时没有exeception显示记录被保存但在表中它没有被插入每当我需要按下时自动！手动执行Sql命令然后插入它。

我尝试过：

Hi Friends

Iam writing a code for insert command in vb.net that time no exeception is showing records are getting saved but in table it is not getting inserted automatically each time i need to press that ! execute Sql command manually then it is getting inserted.

What I have tried:

Imports System.Data
Imports System.Data.SqlClient

Public Class Form3
    

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Dim con As New SqlConnection
        Dim cmd As New SqlCommand
        Try
            con.ConnectionString = "Data Source=ECCNEW\SQLEXPRESS;Initial Catalog=orders;Integrated Security=True"
            con.Open()
            cmd.Connection = con
            cmd.CommandText = "insert into Data(OrderID,OrderDate,CustomerName,Street1,Street2,Street3,EmailID,City,State,Pincode,Product,Quantity,BasicAmount,Mobile) values('" & TextBox1.Text & "','" & DateTimePicker1.Value & "','" & TextBox3.Text & "','" & TextBox4.Text & "','" & TextBox2.Text & "','" & TextBox5.Text & "','" & TextBox6.Text & "','" & TextBox7.Text & "','" & TextBox8.Text & "','" & TextBox9.Text & "','" & TextBox10.Text & "','" & TextBox11.Text & "','" & TextBox12.Text & "','" & TextBox13.Text & "')"
            cmd.ExecuteNonQuery()

        Catch ex As Exception
            MessageBox.Show("Error while inserting record on table..." & ex.Message, "Insert Records")
        Finally
            con.Close()
        End Try
    End Sub
End Class

推荐答案

SELECT * FROM MyTable WHERE StreetAddress = 'Baker's Wood'

就SQL而言，用户添加的引号会终止字符串，并且您会遇到问题。但情况可能更糟。如果我来并改为输入：x'; DROP TABLE MyTable; - 然后SQL收到一个非常不同的命令：

The quote the user added terminates the string as far as SQL is concerned and you get problems. But it could be worse. If I come along and type this instead: "x';DROP TABLE MyTable;--" Then SQL receives a very different command:

SELECT * FROM MyTable WHERE StreetAddress = 'x';DROP TABLE MyTable;--'

哪个SQL看作三个单独的命令：

Which SQL sees as three separate commands:

SELECT * FROM MyTable WHERE StreetAddress = 'x';

完全有效的SELECT

A perfectly valid SELECT

DROP TABLE MyTable;

完全有效的删除表格通讯和

A perfectly valid "delete the table" command

--'

其他一切都是评论。

所以它确实：选择任何匹配的行，从数据库中删除表，并忽略其他任何内容。

所以总是使用参数化查询！或者准备好经常从备份中恢复数据库。你经常定期备份，不是吗？

BTW：帮自己一个忙，并停止使用Visual Studio默认名称 - 你可能还记得TextBox8 今天是手机号码，但是当你必须在三周内修改它时，你会这样吗？使用描述性名称 - 例如tbMobileNo - 您的代码变得更容易阅读，更自我记录，更易于维护 - 并且编码速度更快，因为Intellisense可以通过三次击键来tbMobile，其中TextBox8需要思考大概和8次击键......

And everything else is a comment.
So it does: selects any matching rows, deletes the table from the DB, and ignores anything else.

So ALWAYS use parameterized queries! Or be prepared to restore your DB from backup frequently. You do take backups regularly, don't you?

BTW: Do yourself a favour, and stop using Visual Studio default names for everything - you may remember that "TextBox8" is the mobile number today, but when you have to modify it in three weeks time, will you then? Use descriptive names - "tbMobileNo" for example - and your code becomes easier to read, more self documenting, easier to maintain - and surprisingly quicker to code because Intellisense can get to to "tbMobile" in three keystrokes, where "TextBox8" takes thinking about and 8 keystrokes...

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