使用java在未知表字段情况下通过sql查询信息

场景

在只知道表名，不知道表包含哪些字段情况下，查询该表信息的场景

解决方案

@Testpublic void test() {Connection connection;String DB_URL = "jdbc:mysql://192.168.20.75:9950/geespace_bd_platform_dev?characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&";List<Map<String, Object>> data = new ArrayList<>();Statement stmt = null;ResultSet rs = null;try {Class.forName("com.mysql.jdbc.Driver");connection = DriverManager.getConnection(DB_URL, "geespace", "gee123456");stmt = connection.createStatement();// 获取sql//            rs = stmt.executeQuery("SELECT nth_interval_of_temperature1,number_of_temperature1 FROM 114_interval_statistical_table GROUP BY nth_interval_of_temperature1,number_of_temperature1 order BY nth_interval_of_temperature1 asc");rs = stmt.executeQuery("SELECT * from ge_drag_spark_task");ResultSetMetaData rsmd = rs.getMetaData();while (rs.next()) {for (int i = 1; i <= rsmd.getColumnCount(); i++) {Map<String, Object> map = new HashMap<>(1);map.put(rsmd.getColumnName(i), rs.getObject(i));data.add(map);}}for (Map<String, Object> map: data) {log.info(" map:{}", map);}} catch (SQLException e) {log.error("[getColumnData Exception] --> the exception message is:{}", e.getMessage());} catch (ClassNotFoundException e) {e.printStackTrace();}finally {JdbcUtils.close(rs);JdbcUtils.close(stmt);}}

重要信息

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