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文章选自：http://www.cha-doo.comPAGE\*MERGEFORMAT2参考资料：sqlserver数据库原理与开发HYPERLINK"http://www.crizome.com"哈尔滨白癜风医院ATM系统查询余额DBHelp.cs中的内容：usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Data.SqlClient;namespaceATM{classDBHelp{publicstaticSqlConnectionconnection=newSqlConnection("datasource=.\\sqlexpress;database=ATM_System;integratedsecurity=true");}}Select_Sal查询余额：usingSystem;usingSystem.Collections.Generic;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Linq;usingSystem.Text;usingSystem.Windows.Forms;usingSystem.Data.SqlClient;namespaceATM{publicpartialclassSelect_Bal:Form{publicSelect_Bal(){InitializeComponent();}privatevoid返回ToolStripMenuItem_Click(objectsender,EventArgse){Operateo=newOperate();o.Show();this.Hide();}///<summary>///查询余额///1、从表ATM_Money中查询出余额///</summary>///<paramname="sender"></param>///<paramname="e"></param>privatevoidSelect_Bal_Load(objectsender,EventArgse){DBHelp.connection.Open();stringcommand="selectbalancefromATM_Moneywhereaccount='"+Login.account+"'";SqlCommandcomm=newSqlCommand(command,DBHelp.connection);label1.Text="您当前账户余额为："+comm.ExecuteScalar().ToString()+"元";DBHelp.connection.Close();｝}}
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