package com.bdqn.util;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;


public class DbUtil01 {
	static Connection conn = null;
	static PreparedStatement ps = null;
	static ResultSet rs = null;

	// 获取链接的方法
	public static Connection getConn() {
		// 获取配置文件所配置的信息
		Properties p = new Properties();
		InputStream is = DbUtil.class.getClassLoader().getResourceAsStream("mysql.properties");
		try {
			p.load(is);
			String driver = p.getProperty("driver");
			String url = p.getProperty("url");
			String username = p.getProperty("username");
			String pwd = p.getProperty("password");
			// 第一步 加载驱动
			Class.forName(driver);
			// 第二步 获取链接
			conn = DriverManager.getConnection(url, username, pwd);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return conn;
	}

	// 关闭链接的方法
	public static void closeAll(Connection conn, PreparedStatement ps,
			ResultSet rs) {
		if (conn != null) {
			try {
				conn.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		if (ps != null) {
			try {
				ps.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		if (rs != null) {
			try {
				rs.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

	// 拼接SQL语句
	public static PreparedStatement executeSql(String sql, Object[] obj) {
		conn = getConn();
		if (obj != null || obj.length >= 0) {
			try {
				ps = conn.prepareStatement(sql);
				for (int i = 0; i < obj.length; i++) {
					ps.setObject(i + 1, obj[i]);
				}
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		return ps;
	}
}