I'm writing a very simple program that comes up with a serial Number for computer systems that we make and stores the information about the systems with the serial number in an access file. I'm able to create the new row but I'm getting the error "No Value Given for One or More Parameters" when trying to read from the database searching for a given serial number. Here is my code for the search:
private void btn_Search_Click(object sender, EventArgs e)
{
string filePath = @"c:\serial\Settings.txt";
try
{
// Check if the file exists
if (File.Exists(filePath))
{
// Read the first line using StreamReader
using (StreamReader reader = new StreamReader(filePath))
{
string dataBaseLocation = reader.ReadLine();
//MessageBox.Show(dataBaseLocation);
string newConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + dataBaseLocation;
// Read the auto-incremented key value from a TextBox, assuming the TextBox is named textBoxKey
//MessageBox.Show(txtBox_SNLookUp.Text);
if (long.TryParse(txtBox_SNLookUp.Text, out long keyValue))
{
MessageBox.Show("The Value of keyValue is " + keyValue);
try
{
using (OleDbConnection newConnection = new OleDbConnection(newConnectionString))
{
newConnection.Open();
// SQL query to fetch data from a specific table in the new database
string query = "SELECT * FROM [Serial Numbers] WHERE [Serial Numbers] = @Key";
MessageBox.Show(query);
using (OleDbCommand command = new OleDbCommand(query, newConnection))
{
// Add the parameter to the command
command.Parameters.AddWithValue("@Key", keyValue);
OleDbDataAdapter adapter = new OleDbDataAdapter(command);
DataTable serial_Data_Table = new DataTable();
// Fill the DataTable with data from the new database
adapter.Fill(serial_Data_Table); // This is line 552 that has an error.
// Set the DataGridView's DataSource to the new DataTable
dataGridView_SerialNumbers.DataSource = serial_Data_Table;
}
}
}
catch (Exception ex)
{
// Handle any exceptions that may occur during the database operation
MessageBox.Show("Error: " + ex.Message);
MessageBox.Show(ex.ToString());
richTextBox_Software.Text = ex.ToString();
}
}
else
{
MessageBox.Show("Invalid key value.");
}
}
}
else
{
Console.WriteLine("The file does not exist.");
}
}
catch (Exception ex)
{
MessageBox.Show("Error occurred look hard: " + ex.Message);
}
}
The Access file sets the serial number as an auto increment key. I have double checked all the variables to make sure they are accurate the only one I don't seem to be able to get the value of is the @Key. This has my error traps in it still giving me popups with variables being shown during runtime. The following is the complete error that I'm getting through the debugging:
System.Data.OleDb.OleDbException (0x80040E10): No value given for one or more required parameters.
at System.Data.OleDb.OleDbCommand.ExecuteCommandTextErrorHandling(OleDbHResult hr)
at System.Data.OleDb.OleDbCommand.ExecuteCommandTextForSingleResult(tagDBPARAMS dbParams, Object& executeResult)
at System.Data.OleDb.OleDbCommand.ExecuteCommandText(Object& executeResult)
at System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method)
at System.Data.OleDb.OleDbCommand.ExecuteReader(CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataTable dataTable)
at Serial_Numbers.SLT_SSI.btn_Search_Click(Object sender, EventArgs e) in C:\Users\ccran\OneDrive - Star Light Technologies inc\General\Star light tech\Serial Numbers\Serial Numbers\Serial Numbers\Form1.cs:line 552
I market line 552
I have tried to put in the serial number instead of a variable but still got the same error. I have tried to error trap but with no avail. I have also tried to determine which parameter is empty or null. I have had an AI look at the code saying that the syntax is correct and that the database is set up correctly so there should be no problems.
I am getting an exceptions thrown: System.InvalidOperationException HResult=0x80131509 Message=Command parameter[0] '' data value could not be converted for reasons other than sign mismatch or data overflow.
Source=System.Data StackTrace: at System.Data.OleDb.OleDbCommand.ExecuteCommandTextErrorHandling(OleDbHResult hr) at System.Data.OleDb.OleDbCommand.ExecuteCommandTextForSingleResult(tagDBPARAMS dbParams, Object& executeResult) at System.Data.OleDb.OleDbCommand.ExecuteCommandText(Object& executeResult) at System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method) at System.Data.OleDb.OleDbCommand.ExecuteReader(CommandBehavior behavior) at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) at System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior) at System.Data.Common.DbDataAdapter.Fill(DataTable dataTable) at Serial_Numbers.SLT_SSI.btn_Search_Click(Object sender, EventArgs e) in C:\Users\ccran\OneDrive - Star Light Technologies inc\General\Star light tech\Serial Numbers\Serial Numbers\Serial Numbers\Form1.cs:line 552
Inner Exception 1: OleDbException: Multiple-step OLE DB operation generated errors. Check each OLE DB status value, if available. No work was done.
Access and C# read the auto incremented Serials field differently
As shown in the image above, I changed the code to show the entire data base (only 2 records) and the Serials (used to be Serial Numbers) is different in both. I had a format setup in access that would set the serial number to 202307000x1 but c# only reads the x. looks like I should try and fix this some how so that the format is read correctly. But if I put x into my program it will pull up the correct record.
