C#操作数据库

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;

namespace 数据库
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = -1;
            //准备连接字符串
            string str = "Data Source=JACK-PC;Initial Catalog=test;Integrated Security=True";
            //连接数据库
            using (SqlConnection con = new SqlConnection(str))
            {
                //打开数据库
                con.Open();
                //sql语句
                //string sql = "select * from student";
                //string sql = "insert into student values(4,'陈蕊','chenrui@163.com','锦州')";
                string sql = "insert into student values(5,'陈小蕊','chenxiaorui@163.com','锦州')";
                //执行sql语句
                using (SqlCommand cmd = new SqlCommand(sql,con))
                {
                    n = cmd.ExecuteNonQuery();
                }
                if (n>0)
                {
                    Console.WriteLine("添加成功！");
                    Console.WriteLine("行数："+n);
                }
                else
                {
                    Console.WriteLine("添加失败！");
                }
                Console.ReadKey();
            }//连接结束
        }
    }
}