package com.birds.chart.demo;

import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.LinkedList;

public class DBTools {

	private java.sql.Connection connection;
	private java.sql.PreparedStatement preparedStatement;

	public DBTools() {
		try {
			connection = DriverManager.getConnection(
					"jdbc:mysql://localhost:3306/goldtest", "root", "admin123");
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

	static {
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public void close() {
		if (connection != null) {
			try {
				connection.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}

	public ResultSet executeQuery(String sql, LinkedList<Object> params) {
		try {
			preparedStatement = connection.prepareStatement(sql);
			if (params != null) {
				int i = 1;
				for (Object p : params) {
					preparedStatement.setObject(i++, p);
				}
			}
			return preparedStatement.executeQuery();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return null;
	}

	public static void main(String[] args) {
		LinkedList<Object> params = new LinkedList<Object>();
		params.add("HOME");
		DBTools tool = new DBTools();
		ResultSet rs = tool.executeQuery("SELECT * FROM users where Type= ? order by UpdateTime limit 100", params);
		try {
			System.err.println(rs.next());
		} catch (SQLException e) {
			e.printStackTrace();
		}
		tool.close();
	}
}