import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.sqlException;

/**
 * 本类专门负责数据库的连接与关闭操作，在实例化本类对象时就意味着要进行数据库的开发 
 * 所以在本类的构造方法里要进行数据库的驱动加载与数据库连接取得
 */
public class DatabaseConnection {
	private static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
	private static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
	private static final String DBUSER = "scott";
	private static final String PASSWORD = "tiger";
	private Connection conn = null;

	/**
	 * 在构造方法里面为conn对象进行实例化可以直接取得数据库的连接对象
	 */
	public DatabaseConnection() {
		try {
			Class.forName(DBDRIVER);
			this.conn = DriverManager.getConnection(DBURL,DBUSER,PASSWORD);
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (sqlException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	/**
	 * 负责数据库的关闭
	 */
	public void close() {
		if (this.conn != null) { // 表示现在存在连接对象
			try {
				this.conn.close();
			} catch (sqlException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	/**
	 * 负责数据库连接
	 */
	public Connection getConnection(){
		return this.conn;
	}
}