c#连接数据库

1、首先，要导入MySql.Data.dll

2、代码连接数据库，并进行查询测试

using MySql.Data.MySqlClient;

 class Program
    {
        static void Main(string[] args)
        {
            string connStr = "Database=test007;Data Source=127.0.0.1;port=3306;User Id=root;Password=root;";//注意，每一项之间用分号隔开，不区分大小写，也可以写成"Database=test007;Datasource=127.0.0.1;port=3306;user=root;pwd=root;"
            MySqlConnection conn = new MySqlConnection(connStr);
            conn.Open();
            MySqlCommand cmd = new MySqlCommand("select * from user", conn);
            MySqlDataReader reader = cmd.ExecuteReader();
            ///只读取一行数据
            //if(reader.HasRows)
            //{
            //    reader.Read();  //表示读取一行记录，调用一次读取一行数据
            //    string username = reader.GetString("username");
            //    string password = reader.GetString("password");
            //    Console.WriteLine(username + ":" + password);

            //}

            //全部读取
            while (reader.Read())   //当读取到一行数据的时候，read()返回true，否则返回false
            {
                string username = reader.GetString("username");
                string password = reader.GetString("password");
                Console.WriteLine(username + ":" + password);

            }
            reader.Close();
            conn.Close();
            Console.ReadKey();
        }
    }