managing escape character from windows form to mysql

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i have designed a windows forms which has a textbox in it,in that textbox i will enter path and on click of button i will bind that data to database(mysql) and i am done with it.but if the entered path contains '\'(escape character) it will be ignored while binding for e.g, if E:\folder is path it will be entered as E:folder into database,i know using @ would solve the problem,but still i am not able to do that,i am using property to read n write the file path,can i append @ in the property itself??or is there any other way to do that??

C#

public stringFilePath
        {
            get {return this.FilePathTextBox.Text.Trim();}
            set {this.FilePathTextBox.Text = value;}
        }

Posted 12-May-11 18:10pm

girish sp

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Programm3r · Accepted Answer · 2011-05-12T20:43:00

Solution 1

Hi,

According to the following web site: MySql Strings you can make use of: '\\' -> A backslash ('\') character.'\\'

I think that would solve your problem.

Kind regards,

Posted 12-May-11 20:43pm

Programm3r

Updated 12-May-11 20:44pm

v2

Comments

girish sp 13-May-11 3:38am

thanks very much for the link..
i will revert back if i find any prob,
thanks again,

girish sp 13-May-11 3:39am

my 5

Programm3r 13-May-11 3:53am

great stuff... :)

mahendren · Accepted Answer · 2011-05-12T20:49:00

Solution 2

Unfortunately, @ is for constant strings.
You need to escape the string yourself...

Posted 12-May-11 20:49pm

mahendren

Comments

girish sp 13-May-11 3:36am

ok,i got..as my string varies for each entry i need to escape it every time..that is where i am struck..

any help would be appreciated.

girish sp 13-May-11 3:39am

my 5

Wayne Gaylard · Accepted Answer · 2011-05-12T21:53:00

Solution 3

You can just use Replace to convert "\" to "\\" like this

C#

public string FilePath
        {
            get{return textBox1.Text.Trim();}
            set { this.textBox1.Text = value.Replace(@"\", @"\\"); }
        }

Hope this Helps

Here is the code for the whole form I used for testing :

C#

public string FilePath
        {
            get{return textBox1.Text.Trim();}
            set { this.textBox1.Text = value.Replace(@"\", @"\\"); }
        }
        public Form1()
        {
            InitializeComponent();
        }
        public void Save()
        {
            using (MySqlConnection con = new MySqlConnection("server=localhost;User Id=xxxx;password=xxxx;database=xxxx"))
            {
                MySqlCommand cmdSave = new MySqlCommand("UPDATE"
                                                          + " myTable"
                                                  + " SET"
                                                         + " FilePath = @FilePath"
                                                   + " WHERE"
                                                         + " myClassID = @myClassID", con);
                cmdSave.Parameters.AddWithValue("@myClassID", 1);
                cmdSave.Parameters.AddWithValue("@FilePath", FilePath);
                con.Open();
                int rowsAffected = cmdSave.ExecuteNonQuery();
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            Save();
        }

and it all works as expected.

Good Luck!!

Posted 12-May-11 21:53pm

Wayne Gaylard

Updated 12-May-11 23:26pm

v2

Comments

girish sp 13-May-11 4:27am

if i enter E:\dir\another,my sql would take it as E:\dirnother,don know why??

Wayne Gaylard 13-May-11 4:34am

I tested it with c:\folder1\folder2\folder3\folder4\test.txt and it works fine on MySQL 5.1 using .Net connector 6.3.3.0. I think you may have entered the info incorrectly maybe?

girish sp 13-May-11 5:15am

when i see the value at run time before passing it to a method ,it would still be E:\folder1\folder2 ,i don think its replacing the char??

girish sp 13-May-11 5:16am

if i pass E:\\folder1\\folder2,in textbox,in mysql it would display E:\folder1\folder2

girish sp 13-May-11 5:15am

i m using sharpdevelop and mysql workbench

Wayne Gaylard 13-May-11 5:17am

When I put a breakpoint in the setter for FilePath then I get "C:\\Folder1\\Folder2\\Folder3\\Folder4\\test.txt" as expected.

girish sp 13-May-11 5:19am

thats wat i was expecting,even i put a breakpoint and if i check it shows E:\folder1\folder2..

this really sucks!!

girish sp 13-May-11 6:59am

<pre>
public int Insert(int printerid,int roadid,string FilePath,string FileName)
{
MySqlCommand cmd=null;
try
{
con.Open();
string str=string.Format("INSERT"
+"INTO"
+ "tbl_Driver"
+ "VALUES"
+ " tbl_Driver_PrinterName_id_fk=@printerid"
+ " tbl_Driver_roads_id_fk=@roadid"
+"tbl_Driver_filePath=@FilePath"
+ " tbl_Driver_fileName=@FileName");
//as it reads this line null ref exception i get cmd.Parameters.AddWithValue("@printerid",printerid);
cmd.Parameters.AddWithValue("@roadid",roadid);
cmd.Parameters.AddWithValue("@FilePath",FilePath);
cmd.Parameters.AddWithValue("@FileName",FileName);
cmd=new MySqlCommand(str,con);
return cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
throw ex;
}
finally
{
if(con!=null)
{
con.Close();
con.Dispose();
}
if(cmd!=null)
{
cmd.Dispose();
}
}
}</pre>

this is giving null reference exception as soon as it reads the command(after the line which i have marked with //)

girish sp 13-May-11 7:51am

thanks very much it worked,but if i place your code in property it did not work out i used the same thing before passing it to the query it worked thanks a lot..

Wayne Gaylard 13-May-11 7:03am

I think you need to check whether the variable PrinterID has been initialised, and so is still null

girish sp 13-May-11 8:08am

thanks for your precious time:) solved..

Wayne Gaylard 13-May-11 9:05am

Pleasure.

Kim Togo · Accepted Answer · 2011-05-12T23:18:00

Solution 4

Check out static string MySqlHelper.EscapeString(string value) it takes care of must escaping on a string. But better is to use MySqlParameter.

Posted 12-May-11 23:18pm

Kim Togo

Comments

girish sp 13-May-11 5:21am

where should i use this??i am passing path to a method,before passing as an argument it should consider \ in the path?