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/*
* 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);
}
}