asp.net連接查詢SQL數據庫并把結果顯示在網頁上(2種方法)_Mssql數據庫教程

//建立ASP.NET Web 應用程序，直接在Page_load函數中加入一下代碼，貌似就可以用了
public void Page_Load(object sender, EventArgs e)
{
using (SqlConnection con = new SqlConnection("Data Source=.;uid=sa;pwd=sa;Database=NorthWind"))
{
string username = "forever";
string strSQL = "select * from table where name='" + username + "'";
SqlDataAdapter adapter = new SqlDataAdapter(strSQL, con);
DataSet ds = new DataSet();
adapter.Fill(ds);
foreach (DataRowView drv in ds.Tables[0].DefaultView)
{
Response.Write(drv["第一個字段"]+"|"+drv["第二個字段"]);
}
}
}

//1、修改Web.config配置文件
<configuration>
<connectionStrings>
</connectionStrings>
//下面三行是添加的內容，即連接數據庫的信息
<appSettings>
<add key="connect" value="server=.;database=NorthWind;uid=sa;pwd=sa;"/>
</appSettings>
<system.web>
//2、連接數據庫
sCon = ConfigurationManager.AppSettings["connect"];
if (string.IsNullOrEmpty(sCon))
{
Response.Write("連接字符串為空！");
}
con = new SqlConnection(sCon);
//3、打開數據庫
if (con.State == ConnectionState.Closed)
con.Open();
//4、查詢函數
public SqlDataReader ExcuteDataReader(string strTxt, CommandType cmdType, SqlParameter[] Params)
{
SqlDataReader dr = null;
if (con.State == ConnectionState.Closed)
{
Response.Write("數據庫的連接沒有打開！");
return dr;
}
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandText = strTxt;
cmd.CommandType = cmdType;
if (Params != null)
{
foreach (SqlParameter param in Params)
{
if (param != null) cmd.Parameters.Add(param);
}
}
#if NOTALLOWEXCEPTION
try
#endif
{
if (cmd.ExecuteScalar() != null)
{
dr = cmd.ExecuteReader();
}
}
#if NOTALLOWEXCEPTION
catch(SqlException se)
{
_objToShowErr = se;
_sError = se.Message;
return null;
}
finally
#endif
{
cmd.Dispose();
}
return dr;
}
//5、執行查詢
//SQL語句，id=N'id',加個N是為了能識別中文字符。
string s = "select * from table where id=N'" + id + "'";
SqlParameter[] Params1 = null;
//保存結果
SqlDataReader select_result = null;
select_result = a.ExcuteDataReader(s, CommandType.Text, Params1);
string ss = "";
while (select_result.Read())
{
//根據自己的字段數寫
ss = ss + "第一個字段：" + select_result[0] + ", 第二個字段：" + select_result[1] + "; ";
}
//測試輸出
Response.Write(ss);