sqlbean.java

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 package stu;

import java.io.*; 
import java.sql.*; 

public class sqlBean{/// 

public Connection conn=null; 

public ResultSet rs=null; 

private String DatabaseDriver="sun.jdbc.odbc.JdbcOdbcDriver"; 
//DataSource 数据源名称DSN 
private String DatabaseConnStr="jdbc:odbc:ClassDB2,'sa',shift";

//定义方法 
/*setXxx用于设置属性值;getXxx用于得到属性值*/ 
public void setDatabaseDriver(String Driver){ 
this.DatabaseDriver=Driver; 
} 
public String getDatabaseDriver(){ 
return (this.DatabaseDriver); 
} 

public void setDatabaseConnStr(String ConnStr){ 
this.DatabaseConnStr=ConnStr; 
} 
public String getDatabaseConnStr(){ 
return (this.DatabaseConnStr); 
} 

public sqlBean(){/////构造函数 
try{ 


Class.forName(DatabaseDriver); 
} 
catch(java.lang.ClassNotFoundException e){ 
System.err.println("加载驱动器有错误:"+e.getMessage( )); 
System.out.print("执行插入有错误:"+e.getMessage());//输出到客户端 
} 
} 

public String getString(String name) throws SQLException{
	        if(rs==null) throw new SQLException("ResultSet is null");
	        return String.valueOf(rs.getString(name));
	                     }	                 
public void executeInsert(String sql){ 
try{ 
conn = DriverManager.getConnection("jdbc:odbc:ClassDB","sa","shift");
Statement stmt=conn.createStatement( ); 
stmt.executeUpdate(sql); 
} 
catch(SQLException ex){ 
System.err.println("执行插入有错误:"+ex.getMessage() ); 
System.out.print("执行插入有错误:"+ex.getMessage());//输出到客户端 
} 
} 
// display data 

 
public ResultSet executeQuery(String sql){ 
rs=null; 
try{ 
conn = DriverManager.getConnection("jdbc:odbc:ClassDB","sa","shift");
Statement stmt=conn.createStatement( ); 
rs=stmt.executeQuery(sql);
} 
catch(SQLException ex){ 
System.err.println("执行查询有错误:"+ex.getMessage() ); 
System.out.print("执行查询有错误:"+ex.getMessage()); //输出到客户端 
} 
return rs; 
} 
// delete data 
public void executeDelete(String sql){ 
try{ 

conn = DriverManager.getConnection("jdbc:odbc:ClassDB","sa","shift");
Statement stmt=conn.createStatement( ); 
stmt.executeUpdate(sql); 
} 
catch(SQLException ex){ 
System.err.println("执行删除有错误:"+ex.getMessage() ); 
System.out.print("执行删除有错误:"+ex.getMessage()); //输出到客户端 
} 
} 
////////////////// 
public void CloseDataBase(){ 
try{ 
conn.close(); 
} 
catch(Exception end){ 
System.err.println("执行关闭Connection对象有错误："+end.getMessage( ) ); 
System.out.print("执行执行关闭Connection对象有错误：有错误:"+end.getMessage()); //输出到客户端 
} 
} 
}