import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.apache.log4j.Logger;  
  
public class BaseDao {  
    // 使用log4j記錄日志  
    private static Logger logger = Logger.getLogger(BaseDao.class);  
    // 連接驅(qū)動  
    private static final String DRIVER = "oracle.jdbc.driver.OracleDriver";  
    // 連接路徑  
    private static final String URL = "jdbc:oracle:thin:@localhost:1521:orcl";  
    // 用戶名  
    private static final String USERNAME = "scott";  
    // 密碼  
    private static final String PASSWORD = "tiger";  
      
    //靜態(tài)代碼塊  
    static {  
        try {  
            // 加載驅(qū)動  
            Class.forName(DRIVER);  
        } catch (ClassNotFoundException e) {  
            e.printStackTrace();  
        }  
    }  
  
    /* 
     * 獲取數(shù)據(jù)庫連接 
     */  
    public Connection getConnection() {  
        Connection conn = null;  
        logger.debug("開始連接數(shù)據(jù)庫");  
        try{  
            conn=DriverManager.getConnection(URL, USERNAME, PASSWORD);  
        }catch(SQLException e){  
            e.printStackTrace();  
            logger.error("數(shù)據(jù)庫連接失敗！");  
        }  
        logger.debug("數(shù)據(jù)庫連接成功");  
        return conn;  
    }  
  
    /* 
     * 關(guān)閉數(shù)據(jù)庫連接，注意關(guān)閉的順序 
     */  
    public void close(ResultSet rs, PreparedStatement ps, Connection conn) {  
        if(rs!=null){  
            try{  
                rs.close();  
                rs=null;  
            }catch(SQLException e){  
                e.printStackTrace();  
                logger.error("關(guān)閉ResultSet失敗");  
            }  
        }  
        if(ps!=null){  
            try{  
                ps.close();  
                ps=null;  
            }catch(SQLException e){  
                e.printStackTrace();  
                logger.error("關(guān)閉PreparedStatement失敗");  
            }  
        }  
        if(conn!=null){  
            try{  
                conn.close();  
                conn=null;  
            }catch(SQLException e){  
                e.printStackTrace();  
                logger.error("關(guān)閉Connection失敗");  
            }  
        }  
    }  
}