BaseDao

package com.hhy.dao;


import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/**
 * 得到可用连接
 * @author hhy
 *
 */
public class BaseDao {
	public Connection getConn(){
		Connection conn=null;
		try {
			Class.forName("oracle.jdbc.driver.OracleDriver");
			conn=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ORCL","adus","adus");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return conn;
	}
	/**
	 * 增删改通用
	 * @param sql
	 * @param objects
	 * @return
	 */
	public boolean Update(String sql,Object...objects){
		Connection conn=getConn();
		PreparedStatement pstmt=null;
		try {
			pstmt=conn.prepareStatement(sql);
			if(objects!=null){
				for (int i = 0; i < objects.length; i++) {
					pstmt.setObject(i+1, objects[i]);
				}
			}
			return pstmt.executeUpdate()>0;
		} catch (SQLException e) {
			e.printStackTrace();
			return false;
		}finally{
			closeAll(conn, pstmt, null);
		}
	}
	
	
	 /**
	  * 查询方法
	  * @param sql
	  * @param objects
	  * @return
	  */
	public ResultSet Query(String sql,Object...objects){
		Connection conn=getConn();
		PreparedStatement pstmt=null;
		try {
			pstmt=conn.prepareStatement(sql);
			if(objects!=null){
				for (int i = 0; i < objects.length; i++) {
					pstmt.setObject(i+1, objects[i]);
				}
			}
			return pstmt.executeQuery();
		} catch (SQLException e) {
			e.printStackTrace();
			return null;
		}
	}
	/**
	 * 关闭连接
	 * @param conn
	 * @param stmt
	 * @param rs
	 */
	public void closeAll(Connection conn,Statement stmt,ResultSet rs){
		if(rs!=null){
			try {
				rs.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		if(stmt!=null){
			try {
				stmt.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		if(conn!=null){
			try {
				conn.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}
}

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BaseDao

原文：http://blog.csdn.net/honghaoyang/article/details/22879681