database connection c#

//Download "System.Data.Sqlite" from "Manage Nuget Packages" Section using System.Data.SQLite; SQLiteConnection.CreateFile("TestDB.db3") //Create a Database SQLiteConnection conn = new SQLiteConnection(@"data source = TestDB.db3"); //Establish a connection with our created DB conn.Open(); SQLiteCommand cmd = new SQLiteCommand("create table table1 (username TEXT, password TEXT)", conn); cmd.ExecuteNonQuery(); Console.WriteLine("Enter the username"); string UserName = Console.ReadLine(); Console.WriteLine("Enter Password"); string PassWord = Console.ReadLine(); SQLiteCommand cmd2 = new SQLiteCommand("insert into table1 (username, password) values ('"+Username+"', '"+PassWord+"')", conn); cmd2.ExecuteNonQuery();

private static void CreateCommand(string queryString, string connectionString) { using (SqlConnection connection = new SqlConnection( connectionString)) { SqlCommand command = new SqlCommand(queryString, connection); command.Connection.Open(); command.ExecuteNonQuery(); } }

create class for database connection in c#

public static class SqlDBHelper
{
    public static DataSet ExecuteDataSet(string sql, CommandType cmdType, params SqlParameter[] parameters)
    {
        using (DataSet ds = new DataSet())
        using (SqlConnection connStr = new SqlConnection(ConfigurationManager.ConnectionStrings["DbConn"].ConnectionString))
        using (SqlCommand cmd = new SqlCommand(sql, connStr))
        {
            cmd.CommandType = cmdType;
            foreach (var item in parameters)
            {
                cmd.Parameters.Add(item);
            }

            try
            {
                cmd.Connection.Open();
                new SqlDataAdapter(cmd).Fill(ds);
            }
            catch (SqlException ex)
            {
                //log to a file or Throw a message ex.Message;
            }
            return ds;
        }
    }

    public static DataTable ExecuteDataSet(string sql, CommandType cmdType, params SqlParameter[] parameters)
    {
        using (DataSet ds = new DataSet())
        using (SqlConnection connStr = new SqlConnection(ConfigurationManager.ConnectionStrings["DbConn"].ConnectionString))
        using (SqlCommand cmd = new SqlCommand(sql, connStr))
        {
            cmd.CommandType = cmdType;
            foreach (var item in parameters)
            {
                cmd.Parameters.Add(item);
            }

            try
            {
                cmd.Connection.Open();
                new SqlDataAdapter(cmd).Fill(ds);
            }
            catch (SqlException ex)
            {
                //Show a message or log a message on ex.Message
            }
            return ds.Tables[0];
        }
    }   
}

Posted by: Guest on November-12-2020

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