Java通过JDBC操作ORACLE数据库工具类

    package com.util;  
      
    import java.sql.Connection;  
    import java.sql.DriverManager;  
    import java.sql.PreparedStatement;  
    import java.sql.ResultSet;  
    import java.sql.SQLException;  
    /** 
     *   
     * 2015-3-5下午2:45:56 
     * 
     *MusicWeb.util.DBUtil 
     *连接数据库 类 
     */  
    public class DBUtil {  
          
      
            private static String driver = "oracle.jdbc.driver.OracleDriver";  
      
            private String url = "jdbc:oracle:thin:@localhost:1521:orcl";  
      
            private String user = "XXX";//oracle数据库的用户名  
            private String pwd = "XXXXXX";//oracle数据库的用户密码  
            private PreparedStatement sta = null;  
            private ResultSet rs = null;  
            private Connection conn = null;  
      
            /** 
             * 加载驱动程序 
             */  
            static {  
                try {  
                    Class.forName(driver);  
                } catch (ClassNotFoundException e) {  
                    e.printStackTrace();  
                }  
            }  
      
            /** 
             * @return 连接对象 
             */  
            public Connection getConn() {  
                try {  
                    conn = DriverManager.getConnection(url,user,pwd);  
                } catch (SQLException e) {  
      
                    e.printStackTrace();  
                }  
                return conn;  
            }  
      
            /** 
             * @param sql 
             *            sql语句  增加，删除，修改 
             * @param obj 
             *            参数 
             * @return 
             */  
            public int update(String sql,Object... obj) {  
                int count = 0;  
                conn = getConn();  
                try {  
                    sta = conn.prepareStatement(sql);  
                    if (obj != null) {  
                        for (int i = 0; i < obj.length; i++) {  
                            sta.setObject(i + 1,obj[i]);  
                        }  
                    }  
                    count = sta.executeUpdate();  
                } catch (SQLException e) {  
                    e.printStackTrace();  
                } finally{  
                  
                    close();  
                }  
                return count;  
            }  
      
            /** 
             * @param sql sql语句 
             * @param obj 参数 
             * @return 数据集合 
             */  
            public ResultSet Query(String sql,Object...obj){  
                conn=getConn();  
                try {  
                    sta=conn.prepareStatement(sql);  
                    if(obj!=null){  
                        for(int i=0;i<obj.length;i++){  
                            sta.setObject(i+1,obj[i]);  
                        }  
                    }  
                    rs=sta.executeQuery();  
                } catch (SQLException e) {  
                    e.printStackTrace();  
                }  
                return rs;  
            }  
              
            /** 
             * 关闭资源 
             */  
            public void close() {  
                try {  
                    if (rs != null) {  
                        rs.close();  
                    }  
                } catch (SQLException e) {  
                    e.printStackTrace();  
                } finally {  
                    try {  
                        if (sta != null) {  
                            sta.close();  
                        }  
                    } catch (SQLException e2) {  
                        e2.printStackTrace();  
                    } finally {  
                        if (conn != null) {  
                            try {  
                                conn.close();  
                            } catch (SQLException e) {  
                                e.printStackTrace();  
                            }  
                        }  
                    }  
                }  
            }  
      
    }