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webform1.aspx.cs

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace work020{    public partial class WebForm1 : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {            //ExecuteScalar 的使用            System.Data.SqlClient.SqlConnectionStringBuilder builder = new System.Data.SqlClient.SqlConnectionStringBuilder();            builder.DataSource = "(local)";            builder.InitialCatalog = "test";            builder.UserID = "sa";            builder.Password = "123456";            string conString = builder.ConnectionString;            System.Data.SqlClient.SqlConnection con = new System.Data.SqlClient.SqlConnection(conString);            con.Open();            string sql = "select count(*) as 女性人数 from userinfo where sex=0";            System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand(sql, con);            int count = int.Parse(cmd.ExecuteScalar().ToString());            con.Close();            Response.Write("数据库表userinfo中有女性" + count + "人！");        }    }}

sql

create database test;create table UserInfo(	user_id int identity(1,1) not null,	user_name varchar(20) not null unique,	real_name nvarchar(8) not null,	age tinyint not null,	sex bit not null,	mobile varchar(14),	phone varchar(14),	email varchar(50) not null,	primary key(user_id) );insert into UserInfo values('zhangfei','张飞',36,1,'13011110001','8845996','zf@qq.com');insert into UserInfo values('guanyu','关羽',38,1,'13011110002','8845995','gy@qq.com');insert into UserInfo values('liubei','刘备',42,1,'13011110003','8845994','lb@qq.com');insert into UserInfo values('zhaoyun','赵云',32,1,'13011110004','8845993','zy@qq.com');insert into UserInfo values('huangzhong','黄忠',50,1,'13011110005','8845992','hz@qq.com');insert into UserInfo values('caocao','曹操',48,1,'13011110006','8845991','cc@qq.com');insert into UserInfo values('sunquan','孙权',33,1,'13011110007','8845990','sq@qq.com');insert into UserInfo values('diaochan','貂蝉',20,0,'13011110008','8845880','dc@qq.com');insert into UserInfo values('daqiao','大乔',21,0,'13011110009','8845881','dq@qq.com');insert into UserInfo values('xiaoqiao','小乔',20,0,'13011110010','8845882','xq@qq.com');