简单数据库操作

2008-03-06 09:13 澜心阅读(239) 评论(0) 编辑收藏举报

using System;

using System.Data;

using System.Configuration;

using System.Collections;

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 Logic;

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

{

private string ID

{

get

{

if (Request["ID"] != null)

return Request["ID"].ToString();

else

return "";

}

protected void Page_Load(object sender, EventArgs e)

{

if (!Page.IsPostBack)

{

if (ID.Length > 0)

{

Users users = new Users();

users.LoadMe(int.Parse(ID));

txtName.Text = users.Name;

txtPassword.Text = users.Password;

}

protected void TextBox1_TextChanged(object sender, EventArgs e)

{

}

protected void Button1_Click(object sender, EventArgs e)

{

Users users = new Users();

users.Name = txtName.Text;

users.Password = txtPassword.Text;

if (ID.Length > 0)

{

users.ID = Convert.ToInt32(ID);

users.Update();

Page.RegisterStartupScript("ss", "<script>alert(\'修改成功！\');window.opener.__doPostBack(\'Button1\',\'\');window.close();</script>");

}

else

{

users.Insert();

Page.RegisterStartupScript("ss", "<script>alert(\'添加成功！\');window.opener.__doPostBack(\'Button1\',\'\');window.close();</script>");

}

//Page.RegisterStartupScript("sfsfsdf","<script>alert(\'添加成功！\');</script>");

}

数据层类：主要用于数据访问

using System;

using System.Data;

using System.Data.Sql;

using System.Data.SqlClient;

/// <summary>

/// DataAccess 的摘要说明

/// </summary>

public class DataAccess

{

string connectionStr = "";

SqlConnection conn;

SqlCommand comm;

SqlDataAdapter sqlDataAdapter;

public DataAccess()

{

connectionStr = System.Configuration.ConfigurationSettings.AppSettings["connnectionstring"];

conn = new SqlConnection(connectionStr);

}

/// <summary>

/// 执行命令，返回受影响的行数

/// </summary>

/// <param name="sql"></param>

/// <returns></returns>

public int ExecuteNoQuery(string sql)

{

conn.Open();

//comm = new SqlCommand();

//comm.Connection = conn;

//comm.CommandText = sql;

comm = new SqlCommand(sql, conn);

int result = comm.ExecuteNonQuery();

comm.Dispose();

conn.Close();

return result;

}

/// <summary>

/// 返回已经填充数据的DataSet

/// </summary>

/// <param name="sql"></param>

/// <returns></returns>

public DataSet ExecuteDataSet(string sql)

{

conn.Open();

comm = new SqlCommand(sql, conn);

sqlDataAdapter = new SqlDataAdapter(comm);

DataSet ds = new DataSet();

sqlDataAdapter.Fill(ds);

conn.Close();

return ds;

}

public string ExecuteScalar(string sql)

{

conn.Open();

//comm = new SqlCommand();

//comm.Connection = conn;

//comm.CommandText = sql;

comm = new SqlCommand(sql, conn);

object obj = comm.ExecuteScalar();

comm.Dispose();

conn.Close();

return obj.ToString();

}

逻辑层主要是实体类

using System;

using System.Data;

using System.Collections.Generic;

using System.Text;

namespace Logic

{

public class Users

{

DataAccess da = new DataAccess();

属性，分别对应数据库中的字段

/// <summary>

/// 根据主键，去数据库中查询，并用查询到的数据填充该类

/// </summary>

/// <param name="ID"></param>

public void LoadMe(int ID)

{

string sql = string.Format("select * from users where 1=1 and ID = {0}", ID);

DataSet ds = da.ExecuteDataSet(sql);

DataTable dt = ds.Tables[0];

DataRow row = dt.Rows[0];

m_Name = row["name"].ToString();

m_Password = row["password"].ToString();

}

public bool Insert()

{

string sql = string.Format("insert into users(name,password) values(\'{0}\',\'{1}\')",m_Name,m_Password);

int result = da.ExecuteNoQuery(sql);

return (result == 1);

}

public bool Update()

{

string sql = string.Format("update users set name = \'{0}\',password = \'{1}\' where 1=1 and ID = {2}", m_Name, m_Password,m_ID);

int result = da.ExecuteNoQuery(sql);

return (result == 1);

}

public bool Delete()

{

string sql = string.Format(" delete from users where 1=1 and ID = {0}", m_ID);

int result = da.ExecuteNoQuery(sql);

return (result == 1);

}

public Users()

{

}

public bool Login(string name, string password)

{

StringBuilder sb = new StringBuilder();

sb.Append("select count(*) from users where 1=1 ");

sb.AppendFormat(" and name = \'{0}\' and password = \'{1}\' ", name,password);

string result = da.ExecuteScalar(sb.ToString());

return (result == "1");

}

List页面

using System;

using System.Data;

using System.Configuration;

using System.Collections;

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 Data;

using Logic;

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

{

DataAccess da = new DataAccess();

protected void Page_Load(object sender, EventArgs e)

{

///第一次加载的时候执行，点击按钮等请求的时候不再执行该段代码

if (!Page.IsPostBack)

{

BindGridView();

}

public void BindGridView()

{

string sql = "select * from users ";

DataSet ds = da.ExecuteDataSet(sql);

GridView1.DataSource = ds;

GridView1.DataBind();

}

protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)

{

}

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)

{

string cmd = e.CommandName.ToString();

string ID = e.CommandArgument.ToString();

Users users = new Users();

users.ID = int.Parse(ID);

users.Delete();

BindGridView();

}

protected void Button1_Click(object sender, EventArgs e)

{

BindGridView();

}

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)

{

if (e.Row.RowType == DataControlRowType.DataRow)

{

LinkButton deleteBtn = (LinkButton)e.Row.FindControl("LbDeleteButton");

deleteBtn.Attributes.Add("onclick", "return confirm(\'确定删除吗？\');");

}

编辑页面