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[转载]SqlConnection,SqlCommand,SqldataReader的用法总结:

2012-03-12 22:21 204 查看

http://www.cnblogs.com/winner/archive/2008/01/09/1032651.html

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

//-------------------SqlConnection,SqlCommand,SqldataReader的用法-------------------//

//下面的4种形式等价,如果你的数据库是Windows连接方法,直接把连接字符串改成"server=.;database=northwind;integrated security=true;"

//如果你的数据库是某个实例名,直接把"server=."改成"server=你的计算机名实例名"就可以了

SqlConnection con = new SqlConnection();

con.ConnectionString = "server=.;database=northwind;uid=sa;pwd=;"; //双引号中的最后一个分号可以去掉

con.Open();

SqlCommand cmd = con.CreateCommand();

cmd.CommandText = "select * from customers";

SqlDataReader sdr = cmd.ExecuteReader();

this.GridView1.DataSource = sdr;

this.GridView1.DataBind();

sdr.Close();

con.Close();

//SqlConnection con = new SqlConnection();

//con.ConnectionString = "server=.;database=northwind;uid=sa;pwd=;"; //双引号中的最后一个分号可以去掉

//con.Open();

//SqlCommand cmd = new SqlCommand("select * from customers");

//cmd.Connection = con;

//SqlDataReader sdr = cmd.ExecuteReader();

//this.GridView1.DataSource = sdr;

//this.GridView1.DataBind();

//sdr.Close();

//con.Close();

////我最经常用这一种,同时连接对象是整个程序的公共对象,所以我一般会把数据库连接封装到一个类中,这样就可以在程序的任何地方随时调用

//SqlConnection con = new SqlConnection("server=.;database=northwind;uid=sa;pwd=;"); //双引号中的最后一个分号可以去掉

//con.Open();

//SqlCommand cmd = new SqlCommand("select * from customers", con);

//SqlDataReader sdr = cmd.ExecuteReader();

//this.GridView1.DataSource = sdr;

//this.GridView1.DataBind();

//sdr.Close();

//con.Close();

//SqlConnection con = new SqlConnection();

//con.ConnectionString = "server=.;database=northwind;uid=sa;pwd=;"; //双引号中的最后一个分号可以去掉

//con.Open();

//SqlCommand cmd = new SqlCommand();

//cmd.Connection = con;

//cmd.CommandText = "select * from customers";

//cmd.CommandType = CommandType.Text; //这条语句是多余的,因为默认就是Text

//SqlDataReader sdr = cmd.ExecuteReader();

//this.GridView1.DataSource = sdr;

//this.GridView1.DataBind();

//sdr.Close();

//con.Close();

}

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