package cn.itcast.jdbc;

import java.io.InputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

import javax.sql.DataSource;

import org.apache.commons.dbcp.BasicDataSourceFactory;

public final class JdbcUtils {
	private static DataSource dataSource;
	static {
		try {
			Properties properties = new Properties();
			InputStream is = JdbcUtils.class.getClassLoader()
					.getResourceAsStream("dbcpconfig.properties");
			properties.load(is);
			dataSource = BasicDataSourceFactory.createDataSource(properties);
		} catch (Exception e) {
			throw new ExceptionInInitializerError(e);
		}
	}

	private JdbcUtils() {
	}

	public static Connection getConnection() throws SQLException {
		// return DriverManager.getConnection(url, user, password);
		return dataSource.getConnection();
	}

	public static void realse(ResultSet rs, Statement st, Connection conn)
			throws SQLException {
		try {
			if (rs != null)
				rs.close();
		} finally {
			try {
				if (st != null)
					st.close();
			} finally {
				if (conn != null)
					conn.close();
			}
		}
	}
}