14.15 DataAdapter对象

Posted 2020-07-02 前缘

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

namespace _14._15DataAdapter对象
{
    class Program
    {
        static void Main(string[] args)
        {
            string constr = "Server=.;uid=sa;pwd=zqyo850619;database=csharpzxw";
            SqlConnection mycon = new SqlConnection(constr);
            try
            {
                //mycon.Open();
                //string sql = "select*from mytable001";
                //SqlDataAdapter myda = new SqlDataAdapter(sql, mycon);//创建SQL适配器
                //DataSet myds = new DataSet();//初始化数据集
                //myda.Fill(myds, "mytable001");//适配器将表填充进入DataSet
                //Console.WriteLine("填充成功");
                //outValues(myds);
                //Console.ReadKey();

                //更改数据源文件
                mycon.Open();
                string updateSql = "update mytable001 set gender=‘女‘ where name=‘张三‘";
                SqlDataAdapter myda = new SqlDataAdapter("select * from mytable001",mycon);
                
                DataSet myds = new DataSet();
                myda.Fill(myds, "mytable001");//acceptchange 处于true状态
                Console.WriteLine("原dataset对象内容");
                outValues(myds);
                myda.UpdateCommand = new SqlCommand(updateSql, mycon);
                DataRow row = myds.Tables[0].Rows[0];
                   row["gender"] = "女";
                Console.WriteLine("更改后dataset的内容");
                myda.Update(myds, "mytable001");
                outValues(myds);

                Console.ReadKey();

            }
            catch(Exception ex)
            {
                Console.WriteLine(ex.Message.ToString());
            }
            finally
            {
                mycon.Close();
            }

          
        }
        public static void outValues(DataSet ds)
        {
            foreach(DataTable dt in ds.Tables)
            {
               
                Console.WriteLine();
                foreach (DataRow row in dt.Rows)
                {
                   foreach(DataColumn col in dt.Columns)
                        Console.Write(row[col]+"\t");
                }
                Console.WriteLine("表名" + dt.TableName);
            }
          
        }
    }
}