| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.iotdb; |
| |
| import org.apache.iotdb.jdbc.IoTDBSQLException; |
| |
| import java.sql.Connection; |
| import java.sql.DriverManager; |
| import java.sql.ResultSet; |
| import java.sql.ResultSetMetaData; |
| import java.sql.SQLException; |
| import java.sql.Statement; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class SyntaxConventionRelatedExample { |
| /** |
| * if you want to create a time series named root.sg1.select, a possible SQL statement would be |
| * like: create timeseries root.sg1.select with datatype=FLOAT, encoding=RLE As described before, |
| * when using session API, path is represented using String. The path should be written as |
| * "root.sg1.select". |
| */ |
| private static final String ROOT_SG1_KEYWORD_EXAMPLE = "root.sg1.select"; |
| |
| /** |
| * if you want to create a time series named root.sg1.111, a possible SQL statement would be like: |
| * create timeseries root.sg1.`111` with datatype=FLOAT, encoding=RLE The path should be written |
| * as "root.sg1.`111`". |
| */ |
| private static final String ROOT_SG1_DIGITS_EXAMPLE = "root.sg1.`111`"; |
| |
| /** |
| * if you want to create a time series named root.sg1.`a"b'c``, a possible SQL statement would be |
| * like: create timeseries root.sg1.`a"b'c``` with datatype=FLOAT, encoding=RLE The path should be |
| * written as "root.sg1.`a"b`c```". |
| */ |
| private static final String ROOT_SG1_SPECIAL_CHARACTER_EXAMPLE = "root.sg1.`a\"b'c```"; |
| |
| /** |
| * if you want to create a time series named root.sg1.a, a possible SQL statement would be like: |
| * create timeseries root.sg1.a with datatype=FLOAT, encoding=RLE The path should be written as |
| * "root.sg1.a". |
| */ |
| private static final String ROOT_SG1_NORMAL_NODE_EXAMPLE = "root.sg1.a"; |
| |
| private static final String DEVICE = "root.sg1"; |
| |
| public static void main(String[] args) throws ClassNotFoundException, SQLException { |
| Class.forName("org.apache.iotdb.jdbc.IoTDBDriver"); |
| try (Connection connection = |
| DriverManager.getConnection( |
| "jdbc:iotdb://127.0.0.1:6667?version=V_0_13", "root", "root"); |
| Statement statement = connection.createStatement()) { |
| |
| // set JDBC fetchSize |
| statement.setFetchSize(10000); |
| |
| // create time series |
| try { |
| statement.execute(String.format("SET STORAGE GROUP TO %s", DEVICE)); |
| statement.execute( |
| String.format( |
| "CREATE TIMESERIES %s WITH DATATYPE=INT64, ENCODING=RLE, COMPRESSOR=SNAPPY", |
| ROOT_SG1_DIGITS_EXAMPLE)); |
| statement.execute( |
| String.format( |
| "CREATE TIMESERIES %s WITH DATATYPE=INT64, ENCODING=RLE, COMPRESSOR=SNAPPY", |
| ROOT_SG1_KEYWORD_EXAMPLE)); |
| statement.execute( |
| String.format( |
| "CREATE TIMESERIES %s WITH DATATYPE=INT64, ENCODING=RLE, COMPRESSOR=SNAPPY", |
| ROOT_SG1_NORMAL_NODE_EXAMPLE)); |
| statement.execute( |
| String.format( |
| "CREATE TIMESERIES %s WITH DATATYPE=INT64, ENCODING=RLE, COMPRESSOR=SNAPPY", |
| ROOT_SG1_SPECIAL_CHARACTER_EXAMPLE)); |
| } catch (IoTDBSQLException e) { |
| System.out.println(e.getMessage()); |
| } |
| |
| // show timeseries |
| ResultSet resultSet = statement.executeQuery("show timeseries root.sg1.*"); |
| List<String> timeseriesList = new ArrayList<>(); |
| while (resultSet.next()) { |
| timeseriesList.add(resultSet.getString("timeseries")); |
| } |
| for (String path : timeseriesList) { |
| for (int i = 0; i <= 10; i++) { |
| statement.addBatch(prepareInsertStatement(i, path)); |
| } |
| } |
| statement.executeBatch(); |
| statement.clearBatch(); |
| |
| resultSet = statement.executeQuery("select ** from root.sg1 where time <= 10"); |
| outputResult(resultSet); |
| for (String path : timeseriesList) { |
| // For example, for timeseires root.sg1.`111`, sensor is 111, as described in syntax |
| // convention, it should be written as `111` in SQL |
| // in resultSet of "show timeseries", result is root.sg1.`111`, which means you need not to |
| // worry about dealing with backquotes yourself. |
| resultSet = |
| statement.executeQuery(String.format("select %s from root.sg1", removeDevice(path))); |
| outputResult(resultSet); |
| } |
| } catch (IoTDBSQLException e) { |
| System.out.println(e.getMessage()); |
| } |
| } |
| |
| private static void outputResult(ResultSet resultSet) throws SQLException { |
| if (resultSet != null) { |
| System.out.println("--------------------------"); |
| final ResultSetMetaData metaData = resultSet.getMetaData(); |
| final int columnCount = metaData.getColumnCount(); |
| for (int i = 0; i < columnCount; i++) { |
| System.out.print(metaData.getColumnLabel(i + 1) + " "); |
| } |
| System.out.println(); |
| while (resultSet.next()) { |
| for (int i = 1; ; i++) { |
| System.out.print(resultSet.getString(i)); |
| if (i < columnCount) { |
| System.out.print(", "); |
| } else { |
| System.out.println(); |
| break; |
| } |
| } |
| } |
| System.out.println("--------------------------\n"); |
| } |
| } |
| |
| private static String prepareInsertStatement(int time, String path) { |
| // remove device root.sg1 |
| path = removeDevice(path); |
| return String.format( |
| "insert into root.sg1(timestamp, %s) values(" + time + "," + 1 + ")", path); |
| } |
| |
| private static String removeDevice(String path) { |
| return path.substring(DEVICE.length() + 1); |
| } |
| } |