C ＃ connect to the database to complete the operation of adding, deleting, modifying and querying

---

Preface

Introduce C# Connect to the database to complete the operations of adding, deleting, modifying and querying

---

One 、 download

1、 Download package

Select menu bar tool ->NuGet Package manager -> Manage solutions NuGet Package , Select browse , Input MySql.Data, Search and download .

Two 、 Use steps

using System;using MySql.Data.MySqlClient;namespace Demo{    class Program    {        private static MySqlConnectionStringBuilder mysqlbuilder = new MySqlConnectionStringBuilder();        private static MySqlConnection mysqlconnection;        static void Main(String[] args)        {            mysqlbuilder.UserID = "root";            mysqlbuilder.Password = "123456";            mysqlbuilder.Server = "localhost";            mysqlbuilder.Database = "springboot";            mysqlconnection = new MySqlConnection(mysqlbuilder.ConnectionString);            mysqlconnection.Open();            // increase             /*Console.WriteLine(" Please enter a user name :");            string name = Console.ReadLine();            Console.WriteLine(" Please enter age :");            string age = Console.ReadLine();            string sql = "insert into users(name,age) values(@name,@age)";            MySqlCommand cmd = new MySqlCommand(sql, mysqlconnection);            cmd.Parameters.Add(new MySqlParameter("@name", name));            cmd.Parameters.Add(new MySqlParameter("@age", age));            int rows=cmd.ExecuteNonQuery();            if (rows == 1)            {                Console.WriteLine(" Registered successfully !");            }            else            {                Console.WriteLine(" Registration failed !");            }*/            // Delete             /* Console.WriteLine(" Please enter id:");             string id = Console.ReadLine();             string sql = "delete from users where [email protected]";             MySqlCommand cmd = new MySqlCommand(sql, mysqlconnection);             cmd.Parameters.Add(new MySqlParameter("@id", id));             int rows = cmd.ExecuteNonQuery();             if (rows < 0)             {                 Console.WriteLine(" Delete failed !");             }             else             {                 Console.WriteLine(" Delete successful !");             }             mysqlconnection.Close();*/            // modify             Console.WriteLine(" Please enter ID:");            string id = Console.ReadLine();            Console.WriteLine(" Please enter age :");            string age = Console.ReadLine();            string sql = "update users set [email protected] where [email protected]";            MySqlCommand cmd = new MySqlCommand(sql, mysqlconnection);            cmd.Parameters.Add(new MySqlParameter("@age", age));            cmd.Parameters.Add(new MySqlParameter("@id", id));            int rows = cmd.ExecuteNonQuery();            if (rows < 0)            {                Console.WriteLine(" Modification failed !");            }            else            {                Console.WriteLine(" Modification successful !");            }            mysqlconnection.Close();            // Inquire about             /*   string sql = "select * from users";               MySqlCommand cmd = new MySqlCommand(sql, mysqlconnection);               MySqlDataReader reader = cmd.ExecuteReader();               Console.WriteLine("id\tname\tage");               while(reader.Read())               {                   Console.Write(reader.GetInt32(0) + "\t");                   if(reader.IsDBNull(1))                   {                       Console.Write("\t");                   }                   else                   {                       Console.Write(reader.GetString("name") + "\t");                   }                   if (reader.IsDBNull(2))                   {                       Console.Write(" ");                   }                   else                   {                       Console.WriteLine(reader.GetString(2) + "\t");                   }               }               mysqlconnection.Close();*/        }    }}

---

author ： the greatest hero in the world tr

Game programming , A game development favorite ~

If the picture is not displayed for a long time , Please use Chrome Kernel browser .