Question

I have problem searching for a long string that contains special character in MS Access. Here is my sample data.

staff_Id | hashValue
   1     | 4ENOA2838F09dbfTKXeAdEIKRM91MdsDg0W4pRNChdkGa7iwoVifWH9avZdjrPp1QqLJ0ecNe/X716HlwqfSYA==

Here is my SQL command.

SELECT *
FROM table
WHERE hashValue='4ENOA2838F09dbfTKXeAdEIKRM91MdsDg0W4pRNChdkGa7iwoVifWH9avZdjrPp1QqLJ0ecNe/X716HlwqfSYA==';

I had tried googling for escape characters, however I cannot get this working. Hope that you can help me. Thank you.

P.S. I am developing a C# program that interacts with MS-access

UPDATE

Here is my SQL query in my C# program that execute the search query.

string sqlStatement = "SELECT * FROM table WHERE hashValue = @hashedValue";
using (OleDbConnection connection = new OleDbConnection(connString))
{
    using (OleDbCommand command = new OleDbCommand())
    {
        command.Connection = connection;
        command.CommandText = sqlStatement;
        command.Parameters.AddWithValue("@hashedValue", hashedValue);

        ds = new DataSet(); //have been declared
        dbAdapter = new OleDbDataAdapter(); //have been declared
        dbAdapter.SelectCommand = command;
        dbAdapter.Fill(ds, "table"); //empty dataset here
    }
}

Answer 1

in C# try writing the command like this:

string hashValue = @"4ENOA2838F09dbfTKXeAdEIKRM91MdsDg0W4pRNChdkGa7iwoVifWH9avZdjrPp1QqLJ0ecNe/X716HlwqfSYA==";

string sql = string.Format("SELECT * FROM table WHERE hashValue = '{0}'", hashValue);

notis the @ mark before the string. this allows you to have string that look like this:

string test = @" \ ";
Console.WriteLine(test); //output: \

In your case you can do it like this:

command.Parameters.AddWithValue("@hashedValue", @hashedValue);

but the @-trick works best if its set when the string is declared.