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ASP.NET 连接数据库测试(VS2010)
1.新建一个ASP.NET网站模板;双击web.config文件,在<configuration>和</configuration>节点中添加一个<connectionStrings>节点,代码如下:
<connectionStrings> <add name="Con" connectionString="server=YAYUN\SQLEXPRESS;DataBase=Hotel;User ID=sa;Password=1111qq" /> </connectionStrings>
sever是服务器名;DataBase是数据库名;User ID是登录用户名;password是登录密码。
加入后整体代码如下:
<?xml version="1.0"?> <!-- 有关如何配置 ASP.NET 应用程序的详细信息,请访问 http://go.microsoft.com/fwlink/?LinkId=169433 --> <configuration> <connectionStrings> <add name="Con" connectionString="server=YAYUN\SQLEXPRESS;DataBase=Hotel;User ID=sa;Password=1111qq" /> </connectionStrings> <!--<connectionStrings> <add name="ApplicationServices" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnetdb.mdf;User Instance=true" providerName="System.Data.SqlClient" /> </connectionStrings>--> <system.web> <compilation debug="true" targetFramework="4.0" /> <authentication mode="Forms"> <forms loginUrl="~/Account/Login.aspx" timeout="2880" /> </authentication> <membership> <providers> <clear/> <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/" /> </providers> </membership> <profile> <providers> <clear/> <add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/"/> </providers> </profile> <roleManager enabled="false"> <providers> <clear/> <add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/" /> <add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/" /> </providers> </roleManager> </system.web> <system.webServer> <modules runAllManagedModulesForAllRequests="true"/> </system.webServer> </configuration>2.双击Default.aspx文件,从工具箱拖一个Label控件到设计视图中。
双击解决方案资源管理器下的Default.aspx.cs,编写如下代码:
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Data.SqlClient; namespace WebApplication7 { public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { SqlConnection connecton = new SqlConnection(System.Web.Configuration.WebConfigurationManager.ConnectionStrings["Con"].ConnectionString.ToString()); try { connecton.Open(); this.Label1.Text = "连接数据库测试成功!"; } catch (Exception err) { this.Label1.Text = "连接数据库失败!"; Label1.Text += err; } finally { connecton.Close(); } } } }
调试结果如下:
连接不成功一般问题出在web.config文件的代码,即
<connectionStrings> <add name="Con" connectionString="server=YAYUN\SQLEXPRESS;DataBase=Hotel;User ID=sa;Password=1111qq" /> </connectionStrings>注意大小写,空格,字符输入,以及各名称对应的正确性!
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