How to Do Database Connection in Selenium C#

Selenium is compatible with many languages like Java, C#, Python, Perl etc. Connect with database and execute query on database is very common thing in testing. 

Basic steps for connect with database and execute query is common for all languages.

• Connect with database
• execute query
• return query result

Syntax is only difference in different languages. If you are using C# in selenium then please go for below code for database connection and execute query.

I have created one function for database connection and execute query on database. It will return query result into DataTable object.

        public DataTable GetQueryResult(String vConnectionString, String vQuery)
        {
            SqlConnection Connection;  // It is for SQL connection
            DataSet ds = new DataSet();  // it is for store query result
   
            try
            {
                Connection = new SqlConnection(vConnectionString);  // Declare SQL connection with connection string 
                Connection.Open();  // Connect to Database
                Console.WriteLine("Connection with database is done.");
    
                SqlDataAdapter adp = new SqlDataAdapter(vQuery, Connection);  // Execute query on database 

                adp.Fill(ds);  // Store query result into DataSet object   

                Connection.Close();  // Close connection 
                Connection.Dispose();   // Dispose connection             
            }
            catch (Exception E)
            {
                Console.WriteLine("Error in getting result of query.");
                Console.WriteLine(E.Message);                                
                return new DataTable();
            }
            return ds.Tables[0];
        }

Code Explanation:

Connection = new SqlConnection(vConnectionString);
Connection.Open();

It is for connect to database as per you connection string.

Connection string format:

ConnectionString = @"Data Source="Data Source"; Initial Catalog="Database name"; User ID="Username"; Password="Password";

SqlDataAdapter adp = new SqlDataAdapter(vQuery, Connection);
adp.Fill(ds);

SqlDataAdapter is used for execute query.
Fill command is used for fill query result into DataSet object.

Connection.Close();
Connection.Dispose();

It is for Close and dispose database connection.

In above code, you can see I have return below value.

return ds.Tables[0];

It is because, query will give only one table. if your query will return more than

one table then your return type should be DataSet instead of DataTable.

return ds;

Please add comment if you have any question.