java-使用DriverManager进行数据库连接

Posted 2021-02-19 ~泊水~

BeanHandler<T>是返回一个实体对象，BeanListHandler<T>是返回一个list实体集合，MapHandler是返回不确定的单个实体对象，MapListHandler是返回不确定的list实体集合。

PreparedStatement statement = connection.prepareStatement(sqlBuilder.toString());
ResultSet resultSet = statement.executeQuery();
BeanListHandler<LocalPerson> listHandler = new BeanListHandler<>(LocalPerson.class);
List<LocalPerson> localPersonList = listHandler.handle(resultSet);

 

/**
     * 连接数据库
     * @param ip
     * @param port
     * @param name
     * @param user
     * @param password
     * @return
     */
    public Connection connectionDataBase(String ip,String port,String name,String user,String password){
        Connection connection = null;
        try {
            String url = "jdbc:postgresql://" + ip + ":" + port + "/" + name;
            connection = DriverManager.getConnection(url,user,password);
            logger.info("数据库连接成功，url: " + url);
        } catch (Exception e) {
            logger.error("connectionDataBase error: ",e);
        }
        return connection;
    }

    /**
     * 关闭数据库
     * @param connection
     */
    public void closeDataBase(Connection connection){
        try {
            if (connection != null){
                connection.close();
                logger.info("数据库关闭连接");
            }
        } catch (SQLException e) {
            logger.error("closeDataBase error: ",e);
        }
    }