Can't retrieve data from local database?

Question

2.67/5 (3 votes)

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I am learning C#
and I am trying to create simple dictionary which will translate words from english to my native language.
I can't understand where i made mistake, i want to retrieve data from local database when user will press button "button1"
now it shows such message: Unhandled exception has occured in your application...
The following are my code of program:

C#

private void button1_Click(object sender, EventArgs e)
        {
            
                try
                {

                    SqlCeConnection con = new SqlCeConnection("c:\\users\\rustam\\documents\\visual studio 2012\\Projects\\Sozluk\\Sozluk\\dictionary.sdf");
                    SqlCeCommand com = new SqlCeCommand("Select soz, terjime, mysal from sozler where soz='" + soz1.Text + "'", con);
                    con.Open();

                    SqlCeDataReader reader = com.ExecuteReader();

                    if (reader.Read())
                    {
                        soz1.Text = reader.GetString(0);
                        terjime1.Text = reader.GetString(1);
                        mysal1.Text = reader.GetString(2);
                    }
                    else
                    {

                        MessageBox.Show("Invalid Word", "Dictionary", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }


                }
                catch (SqlCeException)
                {
                    MessageBox.Show("Error"); // Would be an improvement than just the word 'Error'
                }


           }

Posted 17-Jun-14 7:01am

Rustam777

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Dave Kreskowiak 17-Jun-14 13:13pm

...and the exception message would be .....? Hint: It's NOT 'An unhandled exception has occured...'

ZurdoDev 17-Jun-14 14:08pm

1. You are exposing your database to sql injections.
2. Never just show "Error" when there is an error. Show the message on the exception.
3. What is the actual error?
4. What line of code causes the error?

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Jafarinejadvazifehkhorani · Accepted Answer · 2014-06-17T08:04:00

Solution 1

Please refer to the following link that explains almost everything that you need.

http://technet.microsoft.com/en-us/library/aa226134(v=SQL.80).aspx[^]

I tried it in my machine and it worked.

I think there is a problem in the created table(sozler) or maybe in the connection string.

Posted 17-Jun-14 8:04am

Jafarinejadvazifehkhorani

Comments

Rustam777 17-Jun-14 14:22pm

Thank u.
I fixed my problem) but now i want to know how to include database for installer)?
for example if i want to install my app in another pc, it will not work because another pc doesnt have maybe installed sql server and even if installed, he doesnt have database which i created on my sqlServer. Do u know how to include database to installer?

leon de boer · Accepted Answer · 2014-06-17T08:09:00

Solution 2

1st question is the SQL database compact? Are you really sure you are suppose to be using SqlCeConnection rather than SqlConnection etc. Thats not causing the error by the way but if it's wrong it wont work anyhow :-)

Next you need to go back and read up again on string basics

Finally if you really do need to use SqlCeConnection then at least look at the Microsoft sample at the bottom of the help on the API call

HINT HERE SCROLL TO BOTTOM => http://msdn.microsoft.com/en-us/library/system.data.sqlserverce.sqlceconnection.connectionstring%28v=vs.100%29.aspx[^]

Posted 17-Jun-14 8:09am

leon de boer

Comments

Rustam777 17-Jun-14 14:12pm

Thank u leon de boer.
I fixed my problem) but now i want to know how to include database for installer)?

Rustam777 17-Jun-14 14:14pm

for example if i want to install my app in another pc, it will not work because another pc doesnt have maybe installed sql server and even if installed, he doesnt have database which i created on my sqlServer. Do u know how to include database to installer?

phil.o 17-Jun-14 17:19pm

Well, "dictionary.sdf" is pretty obvious on which database engine he needs, isn't it? :)

Jafarinejadvazifehkhorani · Accepted Answer · 2014-06-17T09:14:00

the following link is explaining how to deploy SQLServer Compact
http://msdn.microsoft.com/en-us/library/aa983326(v=vs.90).aspx[^]

and this one is explaining how to add your database in the deployment

http://msdn.microsoft.com/en-us/library/aa983340(v=vs.90).aspx[^]

Hope it solves the issue

Can't retrieve data from local database?

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