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Commit 9f2b4a0

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Code sample - 23c JDBC Reactive Extensions (#317)
* Code sample - 23c JDBC Reactive Extensions * code sample adjustments * code sample adjustments * code sample adjustments * changed to make the explanation release-agnostic * updated to driver 23.6.0.24.10 as requested * updated to driver 23.7.0.25.01, added Statements for DDL, added OraclePreparedStatement for DML, added new queries including select (streaming) example method, added sql file, added DB connection config.properties file
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.oracle.jdbc.reactive</groupId>
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<artifactId>jdbc-reactive-extensions-intro</artifactId>
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<version>1.0-SNAPSHOT</version>
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<name>jdbc-reactive-extensions-intro</name>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>21</maven.compiler.source>
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<maven.compiler.target>21</maven.compiler.target>
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</properties>
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<dependencies>
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<dependency>
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<groupId>com.oracle.database.jdbc</groupId>
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<artifactId>ojdbc17-production</artifactId>
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<version>23.7.0.25.01</version>
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<type>pom</type>
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</dependency>
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</dependencies>
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<build>
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<pluginManagement><!-- lock down plugins versions to avoid using Maven
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defaults (may be moved to parent pom) -->
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<plugins>
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<plugin>
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<artifactId>maven-clean-plugin</artifactId>
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<version>3.1.0</version>
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</plugin>
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<plugin>
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<artifactId>maven-site-plugin</artifactId>
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<version>3.7.1</version>
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</plugin>
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<plugin>
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<artifactId>maven-project-info-reports-plugin</artifactId>
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<version>3.0.0</version>
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</plugin>
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<!-- see
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http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
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<plugin>
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<artifactId>maven-resources-plugin</artifactId>
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<version>3.0.2</version>
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</plugin>
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.8.0</version>
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</plugin>
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<plugin>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>2.22.1</version>
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</plugin>
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<plugin>
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<artifactId>maven-jar-plugin</artifactId>
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<version>3.0.2</version>
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</plugin>
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<plugin>
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<artifactId>maven-install-plugin</artifactId>
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<version>2.5.2</version>
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</plugin>
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<plugin>
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<artifactId>maven-deploy-plugin</artifactId>
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<version>2.8.2</version>
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</plugin>
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</plugins>
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</pluginManagement>
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</build>
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</project>
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/*
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Copyright (c) 2024, Oracle and/or its affiliates.
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This software is dual-licensed to you under the Universal Permissive License
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(UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl or Apache License
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2.0 as shown at http://www.apache.org/licenses/LICENSE-2.0. You may choose
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either license.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package com.oracle.jdbc.reactive;
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import oracle.jdbc.OracleConnection;
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import oracle.jdbc.pool.OracleDataSource;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.sql.SQLException;
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import java.util.Properties;
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public class DatabaseConfig {
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private static final ConfigData CONFIG_DATA = loadConfig();
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private static ConfigData loadConfig() {
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Properties properties = new Properties();
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try {
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var fileStream = Files.newInputStream(Path.of("src/main/resources/config.properties"));
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properties.load(fileStream);
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return new ConfigData(properties.getProperty("DRIVER"), properties.getProperty("USER"),
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properties.getProperty("PASSWORD"), properties.getProperty("HOST"),
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Integer.parseInt(properties.getProperty("PORT")), properties.getProperty("DATABASE"),
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properties.getProperty("DB_TABLE_NAME"));
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} catch (IOException e) {
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e.printStackTrace();
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return null;
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}
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}
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public static OracleDataSource getDataSource() throws SQLException {
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if (CONFIG_DATA == null) {
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throw new IllegalStateException("Configuration data is not available, check file path.");
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}
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OracleDataSource dataSource = new OracleDataSource();
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dataSource
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.setURL("jdbc:oracle:thin:@" + CONFIG_DATA.host() + ":" + CONFIG_DATA.port() + "/" + CONFIG_DATA.database());
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dataSource.setUser(CONFIG_DATA.user());
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dataSource.setPassword(CONFIG_DATA.password());
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return dataSource;
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}
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public static OracleConnection getConnection() throws SQLException {
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return (OracleConnection) getDataSource().getConnection();
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}
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public static String getDbTableName() {
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if (CONFIG_DATA == null) {
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throw new IllegalStateException("Configuration could not be loaded.");
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}
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return CONFIG_DATA.dbTableName();
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}
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public static String getDriver() {
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if (CONFIG_DATA == null) {
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throw new IllegalStateException("Configuration could not be loaded.");
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}
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return CONFIG_DATA.driver();
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}
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public static String getUser() {
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if (CONFIG_DATA == null) {
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throw new IllegalStateException("Configuration could not be loaded.");
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}
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return CONFIG_DATA.user();
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}
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public static String getPassword() {
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if (CONFIG_DATA == null) {
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throw new IllegalStateException("Configuration could not be loaded.");
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}
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return CONFIG_DATA.password();
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}
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public static String getHost() {
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if (CONFIG_DATA == null) {
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throw new IllegalStateException("Configuration could not be loaded.");
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}
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return CONFIG_DATA.host();
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}
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public static int getPort() {
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if (CONFIG_DATA == null) {
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throw new IllegalStateException("Configuration could not be loaded.");
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}
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return CONFIG_DATA.port();
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}
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public static String getDatabase() {
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if (CONFIG_DATA == null) {
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throw new IllegalStateException("Configuration could not be loaded.");
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}
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return CONFIG_DATA.database();
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}
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private record ConfigData(String driver, String user, String password, String host, int port, String database,
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String dbTableName) {
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}
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}
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/*
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Copyright (c) 2024, Oracle and/or its affiliates.
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This software is dual-licensed to you under the Universal Permissive License
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(UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl or Apache License
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2.0 as shown at http://www.apache.org/licenses/LICENSE-2.0. You may choose
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either license.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package com.oracle.jdbc.reactive;
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import java.sql.SQLException;
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import java.util.concurrent.Flow;
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import java.util.concurrent.SubmissionPublisher;
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import java.util.stream.IntStream;
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import oracle.jdbc.OracleConnection;
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import oracle.jdbc.OraclePreparedStatement;
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import oracle.jdbc.OracleResultSet;
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import oracle.jdbc.OracleStatement;
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public class SQLStatementWithAsynchronousJDBC {
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public static void main(String[] args) throws InterruptedException {
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SQLStatementWithAsynchronousJDBC asyncSQL = new SQLStatementWithAsynchronousJDBC();
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try (OracleConnection conn = DatabaseConfig.getConnection()) {
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asyncSQL.createTable(conn);
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IntStream.rangeClosed(0, 3).forEach(i -> asyncSQL.insertData(conn, i, "Java " + i, "Duke " + i));
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asyncSQL.readData(conn);
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Thread.sleep(5000);
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asyncSQL.dropTable(conn);
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} catch (SQLException e) {
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e.printStackTrace();
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}
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}
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private Flow.Publisher<Boolean> insertData(OracleConnection connection, int id, String firstName, String lastName) {
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try {
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final OraclePreparedStatement insertStatement = (OraclePreparedStatement) connection
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.prepareStatement("INSERT INTO employee_names (id, first_name, last_name) VALUES (?, ?, ?)");
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insertStatement.setInt(1, id);
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insertStatement.setString(2, firstName);
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insertStatement.setString(3, lastName);
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Flow.Publisher<Boolean> insertPublisher = insertStatement.unwrap(OraclePreparedStatement.class)
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.executeAsyncOracle();
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insertPublisher.subscribe(new Flow.Subscriber<Boolean>() {
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private Flow.Subscription subscription;
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public void onSubscribe(Flow.Subscription subscription) {
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this.subscription = subscription;
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subscription.request(1L);
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}
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public void onNext(Boolean item) {
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}
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public void onError(Throwable throwable) {
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closeStatement();
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throwable.printStackTrace();
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}
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public void onComplete() {
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closeStatement();
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}
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void closeStatement() {
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try {
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if (insertStatement != null && !insertStatement.isClosed()) {
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insertStatement.close();
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}
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} catch (SQLException closeException) {
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closeException.printStackTrace();
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}
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}
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});
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return insertPublisher;
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} catch (SQLException e) {
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e.printStackTrace();
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SubmissionPublisher<Boolean> publisher = new SubmissionPublisher<>();
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publisher.close();
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return publisher;
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}
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}
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public Flow.Publisher<OracleResultSet> readData(OracleConnection connection) {
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try {
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final OraclePreparedStatement readStatement = (OraclePreparedStatement) connection
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.prepareStatement("SELECT * FROM employee_names WHERE first_name LIKE ?");
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readStatement.setString(1, "Jav%");
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Flow.Publisher<OracleResultSet> readPublisher = readStatement.unwrap(OraclePreparedStatement.class)
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.executeQueryAsyncOracle();
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readPublisher.subscribe(new Flow.Subscriber<OracleResultSet>() {
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private Flow.Subscription subscription;
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public void onSubscribe(Flow.Subscription subscription) {
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this.subscription = subscription;
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subscription.request(Long.MAX_VALUE);
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}
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public void onNext(OracleResultSet resultSet) {
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try {
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while (resultSet.next()) {
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int id = resultSet.getInt("id");
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String firstName = resultSet.getString("first_name");
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String lastName = resultSet.getString("last_name");
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System.out.println("ID: " + id + ", First Name: " + firstName + ", Last Name: " + lastName);
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}
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System.out.println("Finished receiving stream data successfully. \nPreparing to drop table...");
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} catch (SQLException e) {
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onError(e);
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}
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}
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public void onError(Throwable throwable) {
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closeStatement();
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throwable.printStackTrace();
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}
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public void onComplete() {
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closeStatement();
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}
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void closeStatement() {
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try {
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if (readStatement != null && !readStatement.isClosed()) {
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readStatement.close();
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}
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} catch (SQLException closeException) {
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closeException.printStackTrace();
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}
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}
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});
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return readPublisher;
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} catch (SQLException e) {
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e.printStackTrace();
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SubmissionPublisher<OracleResultSet> publisher = new SubmissionPublisher<>();
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publisher.close();
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return publisher;
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}
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}
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private void createTable(OracleConnection connection) {
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String createTableSQL = "CREATE TABLE employee_names (id NUMBER PRIMARY KEY, first_name VARCHAR2(50), last_name VARCHAR2(50))";
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try (OracleStatement createTableStatement = (OracleStatement) connection.createStatement()) {
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createTableStatement.execute(createTableSQL);
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System.out.println("Table 'employee_names' created successfully.");
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} catch (SQLException e) {
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e.printStackTrace();
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}
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}
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private void dropTable(OracleConnection connection) {
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String dropTableSQL = "DROP TABLE employee_names";
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try (OracleStatement dropTableStatement = (OracleStatement) connection.createStatement()) {
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dropTableStatement.execute(dropTableSQL);
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System.out.println("Table 'employee_names' dropped successfully.");
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} catch (SQLException e) {
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e.printStackTrace();
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}
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}
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}
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HOST=<YOUR_DB_HOST_NAME>
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PORT=<YOUR_DB_PORT>
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DATABASE=<YOUR_DB_NAME>
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USER=<YOUR_DB_USER
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PASSWORD=<YOUR_DB_PASSWORD>
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SCHEMA=<YOUR_DB_SCHEMA>
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DB_TABLE_NAME=employee_names

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