网上购物系统（Task003）——通用数据库访问函数集SqlHelper类

来源：岁月联盟 编辑：exp 时间：2012-05-10

六、代码页中的类SQLHelper

[csharp]  using System; 
using System.Data; 
using System.Data.SqlClient; 
using System.Configuration; 
using System.Collections.Generic; 
using WestGarden.Model; 
 
namespace WestGarden.Web 
{ 
    public partial class Default6 : System.Web.UI.Page 
    { 
        protected void Page_Load(object sender, EventArgs e) 
        { 
            IList<CategoryInfo> catogories = new List<CategoryInfo>(); 
 
            string connectionString = ConfigurationManager.ConnectionStrings["NetShopConnString"].ConnectionString; 
            string cmdText = "SELECT * FROM Category"; 
 
            //使用静态类，可直接调用，不需要new。  
            SqlDataReader rdr = SqlHelper.ExecuteReader(connectionString, CommandType.Text, cmdText,null); 
 
            while (rdr.Read()) 
            { 
                CategoryInfo category = new CategoryInfo(rdr.GetString(0), rdr.GetString(1), rdr.GetString(2)); 
                catogories.Add(category); 
            } 
            rdr.Close(); 
 
            repCategories.DataSource = catogories; 
            repCategories.DataBind(); 
        } 
    } 
 
    //这个类是静态的，应用程序启动时，自动驻留在内存中，所建连接，在使用过程中，  
    //也只是Close()，放回到连接池中。并没有注销Dispose()，可以下次连接时，快速使用。  
    public abstract class SqlHelper 
    { 
        public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) 
        { 
            SqlCommand cmd = new SqlCommand(); 
            SqlConnection conn = new SqlConnection(connectionString); 
 
            try 
            { 
                //cmd.Connection = conn;  
                //cmd.CommandType = cmdType;  
                //cmd.CommandText = cmdText;  
                 
                //conn.Open();  
 
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters); 
 
                //如果创建了 SqlDataReader 并将 CommandBehavior 设置为 CloseConnection，  
                //则关闭 SqlDataReader 会自动关闭此连接。  
                SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection); 
                cmd.Parameters.Clear(); 
                return rdr; 
            } 
            catch 
            { 
                conn.Close(); 
                throw; 
            } 
            //finally  
            //{  
            //    conn.Close();  
            //}  
        } 
 
        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms) 
        { 
 
            if (conn.State != ConnectionState.Open) 
                conn.Open(); 
 
            cmd.Connection = conn; 
            cmd.CommandText = cmdText; 
 
            if (trans != null) 
                cmd.Transaction = trans; 
 
            cmd.CommandType = cmdType; 
 
            if (cmdParms != null) 
            { 
                foreach (SqlParameter parm in cmdParms) 
                    cmd.Parameters.Add(parm); 
            } 
        } 
    } 
} 
using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections.Generic;
using WestGarden.Model;

namespace WestGarden.Web
{
    public partial class Default6 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            IList<CategoryInfo> catogories = new List<CategoryInfo>();

            string connectionString = ConfigurationManager.ConnectionStrings["NetShopConnString"].ConnectionString;
            string cmdText = "SELECT * FROM Category";

            //使用静态类，可直接调用，不需要new。
            SqlDataReader rdr = SqlHelper.ExecuteReader(connectionString, CommandType.Text, cmdText,null);

            while (rdr.Read())
            {
                CategoryInfo category = new CategoryInfo(rdr.GetString(0), rdr.GetString(1), rdr.GetString(2));
                catogories.Add(category);
            }
            rdr.Close();

            repCategories.DataSource = catogories;
            repCategories.DataBind();
        }
    }

    //这个类是静态的，应用程序启动时，自动驻留在内存中，所建连接，在使用过程中，
    //也只是Close()，放回到连接池中。并没有注销Dispose()，可以下次连接时，快速使用。
    public abstract class SqlHelper
    {
        public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            SqlConnection conn = new SqlConnection(connectionString);

            try
            {
                //cmd.Connection = conn;
                //cmd.CommandType = cmdType;
                //cmd.CommandText = cmdText;
               
                //conn.Open();

                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);

                //如果创建了 SqlDataReader 并将 CommandBehavior 设置为 CloseConnection，
                //则关闭 SqlDataReader 会自动关闭此连接。
                SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;
            }
            catch
            {
                conn.Close();
                throw;
            }
            //finally
            //{
            //    conn.Close();
            //}
        }

        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
        {

            if (conn.State != ConnectionState.Open)
                conn.Open();

            cmd.Connection = conn;
            cmd.CommandText = cmdText;

            if (trans != null)
                cmd.Transaction = trans;

            cmd.CommandType = cmdType;

            if (cmdParms != null)
            {
                foreach (SqlParameter parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }
    }
}
 

七、App_Code文件夹中的类SQLHelper.cs

using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Collections;

namespace WestGarden.Web
{

    /// <summary>
    /// SQLHelper 的摘要说明
    /// </summary>
    //这个类是静态的，应用程序启动时，自动驻留在内存中，所建连接，在使用过程中，
    //也只是Close()，放回到连接池中。并没有注销Dispose()，可以下次连接时，快速使用。
    public abstract class SqlHelper
    {
        public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            SqlConnection conn = new SqlConnection(connectionString);

            try
            {
                //cmd.Connection = conn;
                //cmd.CommandType = cmdType;
                //cmd.CommandText = cmdText;

                //conn.Open();

                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);

                //如果创建了 SqlDataReader 并将 CommandBehavior 设置为 CloseConnection，
                //则关闭 SqlDataReader 会自动关闭此连接。
                SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;
            }
            catch
            {
                conn.Close();
                throw;
            }
            //finally
            //{
            //    conn.Close();
            //}
        }

        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
        {

            if (conn.State != ConnectionState.Open)
                conn.Open();

            cmd.Connection = conn;
            cmd.CommandText = cmdText;

            if (trans != null)
                cmd.Transaction = trans;

            cmd.CommandType = cmdType;

            if (cmdParms != null)
            {
                foreach (SqlParameter parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }
    }
}


八、类库DBUtility中的类SQLHelper.cs

[csharp] using System; 
using System.Configuration; 
using System.Data; 
using System.Data.SqlClient; 
using System.Collections; 
 
namespace WestGarden.DBUtility 
{ 
 
    /// <summary>  
    /// SQLHelper 的摘要说明  
    /// </summary>  
    //这个类是静态的，应用程序启动时，自动驻留在内存中，所建连接，在使用过程中，  
    //也只是Close()，放回到连接池中。并没有注销Dispose()，可以下次连接时，快速使用。  
    public abstract class SqlHelper 
    { 
        public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) 
        { 
            SqlCommand cmd = new SqlCommand(); 
            SqlConnection conn = new SqlConnection(connectionString); 
 
            try 
            { 
                //cmd.Connection = conn;  
                //cmd.CommandType = cmdType;  
                //cmd.CommandText = cmdText;  
 
                //conn.Open();  
 
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters); 
 
                //如果创建了 SqlDataReader 并将 CommandBehavior 设置为 CloseConnection，  
                //则关闭 SqlDataReader 会自动关闭此连接。  
                SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection); 
                cmd.Parameters.Clear(); 
                return rdr; 
            } 
            catch 
            { 
                conn.Close(); 
                throw; 
            } 
            //finally  
            //{  
            //    conn.Close();  
            //}  
        } 
 
        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms) 
        { 
 
            if (conn.State != ConnectionState.Open) 
                conn.Open(); 
 
            cmd.Connection = conn; 
            cmd.CommandText = cmdText; 
 
            if (trans != null) 
                cmd.Transaction = trans; 
 
            cmd.CommandType = cmdType; 
 
            if (cmdParms != null) 
            { 
                foreach (SqlParameter parm in cmdParms) 
                    cmd.Parameters.Add(parm); 
            } 
        } 
    } 
} 
using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Collections;

namespace WestGarden.DBUtility
{

    /// <summary>
    /// SQLHelper 的摘要说明
    /// </summary>
    //这个类是静态的，应用程序启动时，自动驻留在内存中，所建连接，在使用过程中，
    //也只是Close()，放回到连接池中。并没有注销Dispose()，可以下次连接时，快速使用。
    public abstract class SqlHelper
    {
        public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            SqlConnection conn = new SqlConnection(connectionString);

            try
            {
                //cmd.Connection = conn;
                //cmd.CommandType = cmdType;
                //cmd.CommandText = cmdText;

                //conn.Open();

                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);

                //如果创建了 SqlDataReader 并将 CommandBehavior 设置为 CloseConnection，
                //则关闭 SqlDataReader 会自动关闭此连接。
                SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;
            }
            catch
            {
                conn.Close();
                throw;
            }
            //finally
            //{
            //    conn.Close();
            //}
        }

        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
        {

            if (conn.State != ConnectionState.Open)
                conn.Open();

            cmd.Connection = conn;
            cmd.CommandText = cmdText;

            if (trans != null)
                cmd.Transaction = trans;

            cmd.CommandType = cmdType;

            if (cmdParms != null)
            {
                foreach (SqlParameter parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }
    }
}
 

九、制作主界面Default.aspx

[html] <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="WestGarden.Web.Default" %> 
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head runat="server"> 
    <title>肯德基订餐系统——西园工作室</title> 
</head> 
<body> 
    <form id="form1" runat="server"> 
        <asp:Panel ID="panFocus" runat="server" DefaultButton="btnSearch"> 
            <table align="center" border="0" cellpadding="0" cellspacing="0" width="780"> 
                <tr valign="top"> 
                    <td rowspan="2"> 
                        <img src="Images/Comm_Images/Logo_home.jpg" alt="home" /></td> 
                    <td height="25" width="141"> 
                        <asp:TextBox ID="txtSearch" runat="server" CssClass="homeSearchBox" Width="130px"></asp:TextBox></td> 
                    <td width="50"> 
                        <asp:ImageButton ID="btnSearch" runat="server" AlternateText="Search" CausesValidation="false" 
                            CssClass="paddingSearchicon" ImageUrl="Images/Comm_Images/button-search.gif" /></td> 
                    <td width="50"> 
                        <asp:LoginStatus ID="lgnStatus" runat="server" CssClass="homeLink" LoginText="登 录" 
                            LogoutAction="Redirect" LogoutPageUrl="~/Default.aspx" LogoutText="退 出" /> 
                    </td> 
                    <td width="64"> 
                    </td> 
                </tr> 
                <tr> 
                    <td colspan="3"> 
                        <img src="Images/Comm_Images/KFC.JPG" /></td> 
                    <td width="64"> 
                    </td> 
                </tr> 
            </table> 
        </asp:Panel> 
        <table align="center" border="0" cellpadding="0" cellspacing="0" width="780"> 
            <tr> 
                <td width="112"> 
                </td> 
                <td bgcolor="#FFFFFF" width="5"> 
                </td> 
                <td bgcolor="#FFFFFF" height="5" width="436"> 
                </td> 
                <td bgcolor="#FFFFFF" style="width: 5px"> 
                </td> 
                <td width="224"> 
                </td> 
            </tr> 
            <tr> 
                <td> 
                     </td> 
                <td bgcolor="#FFFFFF"> 
                     </td> 
                <td class="welcome"> 
                    欢迎光临肯德基订餐网站</td> 
                <td bgcolor="#FFFFFF" style="width: 5px"> 
                     </td> 
                <td> 
                     </td> 
            </tr> 
            <tr> 
                <td colspan="5" height="1"> 
                </td> 
            </tr> 
            <tr> 
                <td width="112"> 
                    <img height="290" src="Images/Comm_Images/door.jpg" width="112" alt="Sea Horse" /></td> 
                <td bgcolor="#FFFFFF" width="5"> 
                     </td> 
                <td valign="top" width="436"> 
                    <table border="0" cellpadding="0" cellspacing="0"> 
                        <tr> 
                            <td> 
                                打开菜单，会有精彩的发现，各种美味在向您招手</td> 
                        </tr> 
                        <tr> 
                            <td> 
                                等待着您的品尝．</td> 
                        </tr> 
                        <tr> 
                            <td style="padding-left: 20px"> 
                                <asp:Repeater ID="repCategories" runat="server"> 
                                    <HeaderTemplate> 
                                        <table cellspacing="0" border="0" style="border-collapse: collapse;"> 
                                    </HeaderTemplate> 
                                    <ItemTemplate> 
                                        <tr> 
                                            <td> 
                                                <asp:HyperLink runat="server" ID="lnkCategory" NavigateUrl='<%# string.Format("~/Items.aspx?page=0&categoryId={0}", Eval("CategoryId")) %>' 
                                                    Text='<%# Eval("Name") %>' /><asp:HiddenField runat="server" ID="hidCategoryId" Value='<%# Eval("CategoryId") %>' /> 
                                            </td> 
                                        </tr> 
                                    </ItemTemplate> 
                                    <FooterTemplate> 
                                        </table> 
                                    </FooterTemplate> 
                                </asp:Repeater> 
                                <p> 
                                     </p> 
                                <br /> 
                            </td> 
                        </tr> 
                    </table> 
                </td> 
                <td bgcolor="#FFFFFF" valign="top" style="width: 5px"> 
                     </td> 
                <td valign="top"> 
                    <img src="Images/Comm_Images/main_logo.gif" alt="西园软件出品" usemap="#mapWestGardenSoftWare" 
                        border="0" /></td> 
            </tr> 
            <tr> 
                <td> 
                     </td> 
                <td> 
                     </td> 
                <td> 
                    Version 1.0 版权所有:西园电脑工作室.QQ交流群:13033480</td> 
                <td style="width: 5px"> 
                     </td> 
                <td> 
                     </td> 
            </tr> 
        </table> 
        <map id="mapWestGardenSoftWare" name="西园软件"> 
            <area shape="rect" coords="240,235,140,300" href="http://www.2cto.com " 
                target="_blank" alt="西园电脑工作室" /> 
        </map> 
    </form> 
</body> 
</html> 

 


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