using System;
using System.Data;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string constring = "data source=127.0.0.1;Database=;user id=;password=";
SqlConnection myconn = new SqlConnection(constring);
string sql = "";
//SqlCommand mycmd = new SqlCommand(sql);
// mycmd.Connection = myconn;
SqlCommand mycmd = new SqlCommand(sql, myconn);
myconn.Open();
int rows = mycmd.ExecuteNonQuery();//返回受影响的行数,多用于 insert，update，delete，create
myconn.Close();
string sql2 = "";
SqlCommand mycmd2 = new SqlCommand(sql2, myconn);
myconn.Open();
int count = (int)mycmd.ExecuteScalar();//返回单个值，返回记录集中第一行第一列，忽略额外的行和列
myconn.Close();
string sql3 = "";
SqlCommand mycmd3 = new SqlCommand(sql3, myconn);
myconn.Open();
SqlDataReader dr = new SqlDataReader();//返回一行或多行，多用于select
while (dr.Read())
{
//遍历结果集
Response.Write(dr.GetInt32(0) + " " + dr.GetString(1).ToString());
//遍历结果集,使用序数索引器
Response.Write(dr[0].ToString() + " " + dr[1].ToString());
//遍历结果集，使用列名索引器
Response.Write(dr["id"].ToString() + " " + dr["name"].ToString());
//FieldCount(获取当前行中的列数【int】),HasRows(获取当前记录集中的是否包含一行或多行【bool】)
}
dr.Close();
myconn.Close();
string sql4 = "sql1;sql2";
SqlCommand mycmd4 = new SqlCommand(sql4, myconn);
myconn.Open();
SqlDataReader drm = new SqlDataReader();//返回一行或多行，多用于select
do
{
while (drm.Read())
{
//遍历结果集
Response.Write(drm.GetInt32(0) + " " + drm.GetString(1).ToString());
//遍历结果集,使用序数索引器
Response.Write(drm[0].ToString() + " " + drm[1].ToString());
//遍历结果集，使用列名索引器
Response.Write(drm["id"].ToString() + " " + drm["name"].ToString());
}
} while (drm.NextResult());
drm.Close();
myconn.Close();
using (SqlConnection conn = new SqlConnection(constring))
{
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = "sql6";
conn.Open();
using (SqlDataReader drx = cmd.ExecuteReader())//返回一行或多行，多用于select
{
while (drx.Read())
{
//遍历结果集
Response.Write(drx.GetInt32(0) + " " + drx.GetString(1).ToString());
//遍历结果集,使用序数索引器
Response.Write(drx[0].ToString() + " " + drx[1].ToString());
//遍历结果集，使用列名索引器
Response.Write(drx["id"].ToString() + " " + drx["name"].ToString());
}
}
}
}
public void getDataAdapter(){
string constring = "data source=127.0.0.1;Database=;user id=;password=";
SqlConnection myconn = new SqlConnection(constring);
SqlDataAdapter adapter = new SqlDataAdapter("select * from userinfo ", myconn);
//SqlCommand cmd = new SqlCommand("select * from userinfo where id>@id ",myconn);
//cmd.Parameters.AddWithValue("@id",str);
//SqlDataAdapter adapter = new SqlDataAdapter(cmd);
DataTable data = new DataTable();
adapter.Fill(data);
for (int i = 0; i < data.Rows.Count; i++)
{
Response.Write(data.Rows[i]["id"]+" "+data.Rows[i]["name"]);
}
// DataRow dr = data.Rows[n];
}
}