Data source configuration wizard error. Help needed

Question

1.00/5 (1 vote)

See more:

When trying to insert database objects from my access(2016) to my C#(2015), I am getting a continuous error when I click finish of ...

one or more errors occurred while processing the database objects
<newuser>
Could not retrieve schema information for table or view NewUser.'

This is my current code...
Is anyone able to help me with this?

C#

OleDbConnection connection = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\DatabaseEmployees.accdb;Persist Security Info=True");
OleDbCommand command = new OleDbCommand();

int i = 0;
if (IDtbx.Text == string.Empty)
{
MessageBox.Show("Please log in");
}
command = new OleDbCommand("select count(*)from NewUser where Username= '" + IDtbx.Text + "' AND Password= '" + PSWtbx.Text + "'", connection);

if (connection.State == ConnectionState.Closed)
{
connection.Open();
i = (int)command.ExecuteScalar();
}

connection.Close();
if (i > 0)
{
MainSystem mainForm = new MainSystem();
mainForm.FormClosed += new FormClosedEventHandler(Login_FormClosed);
mainForm.Show();
this.Hide();
LoginError.Visible = false;
}

else
{
LoginError.Visible = true;
}

}

What I have tried:

I have tried using all three of my other databases linked to C#, deleting the database and starting again

Posted 11-Nov-17 3:47am

Member 13512434

Updated 11-Nov-17 22:27pm

Suvendu Shekhar Giri

v2

Add a Solution

Comments

Suvendu Shekhar Giri 11-Nov-17 10:45am

Are you sure your table name is "NewUser"?
Usually, people name it as "Users"/"UserLogins"/others and that's why asking.

Member 13512434 11-Nov-17 11:43am

Yes I've double checked and it is the correct name that I'm using

Sinisa Hajnal 11-Nov-17 15:29pm

First of all, you should NEVER paste user input to database query. Google SQL Injection for details.

The error may come from lack of spacing between count(*)from...other than that, is there a schema in Access? Finally, I'd use SQL Express rather than Access :)

Member 13512434 12-Nov-17 7:45am

Sorry, what do you mean by schema in Access please? I'm very new to this

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Patrice T · Answer 1 · 2017-11-11T22:27:00

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[^]