网上购物系统（Task003）——通用数据库访问函数集SqlHelper类
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.x
[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="">
<head runat="server">
<title>肯德基订餐——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=" "
target="_blank" alt="西园电脑工作室" />
</map>
</form>
</body>
</html>
作者 yousuosi