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Basic builder
Signed-off-by: Anders Swanson <anders.swanson@oracle.com>
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‎database/starters/oracle-spring-boot-json-relational-duality-views/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<!-- Copyright (c) 2023, 2024, Oracle and/or its affiliates. -->
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<!-- Licensed under the Universal Permissive License v 1.0 as shown at https://oss.oracle.com/licenses/upl. -->
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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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<parent>
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<artifactId>oracle-spring-boot-starters</artifactId>
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<groupId>com.oracle.database.spring</groupId>
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<version>25.2.0</version>
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<relativePath>../pom.xml</relativePath>
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</parent>
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<artifactId>oracle-spring-boot-json-relational-duality-views</artifactId>
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<version>25.2.0</version>
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<name>Oracle Spring Boot - JSON Relational Duality Views</name>
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<description>Spring Boot for Oracle Database JSON Relational duality Views</description>
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<url>https://github.com/oracle/spring-cloud-oracle/tree/main/database/starters/oracle-spring-boot-json-relational-duality-views</url>
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<organization>
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<name>Oracle America, Inc.</name>
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<url>https://www.oracle.com</url>
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</organization>
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<developers>
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<developer>
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<name>Oracle</name>
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<email>obaas_ww at oracle.com</email>
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<organization>Oracle America, Inc.</organization>
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<organizationUrl>https://www.oracle.com</organizationUrl>
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</developer>
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</developers>
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<licenses>
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<license>
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<name>The Universal Permissive License (UPL), Version 1.0</name>
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<url>https://oss.oracle.com/licenses/upl/</url>
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<distribution>repo</distribution>
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</license>
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</licenses>
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<scm>
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<url>https://github.com/oracle/spring-cloud-oracle</url>
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<connection>scm:git:https://github.com/oracle/spring-cloud-oracle.git</connection>
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<developerConnection>scm:git:git@github.com:oracle/spring-cloud-oracle.git</developerConnection>
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</scm>
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<dependencies>
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<dependency>
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<groupId>com.oracle.database.spring</groupId>
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<artifactId>oracle-spring-boot-starter-ucp</artifactId>
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<version>${project.version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-jdbc</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-jpa</artifactId>
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</dependency>
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<dependency>
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<groupId>jakarta.json</groupId>
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<artifactId>jakarta.json-api</artifactId>
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</dependency>
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<dependency>
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<groupId>org.eclipse.parsson</groupId>
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<artifactId>parsson</artifactId>
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</dependency>
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<dependency>
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<groupId>jakarta.json.bind</groupId>
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<artifactId>jakarta.json.bind-api</artifactId>
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</dependency>
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<dependency>
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<groupId>org.eclipse</groupId>
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<artifactId>yasson</artifactId>
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</dependency>
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<dependency>
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<groupId>org.testcontainers</groupId>
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<artifactId>junit-jupiter</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.testcontainers</groupId>
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<artifactId>testcontainers</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.testcontainers</groupId>
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<artifactId>oracle-free</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-testcontainers</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>

‎database/starters/oracle-spring-boot-json-relational-duality-views/src/main/java/com/oracle/spring/json/duality/builder/DualityViewBuilder.java

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package com.oracle.spring.json.duality.builder;
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import java.sql.Connection;
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import java.sql.SQLException;
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import java.sql.Statement;
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import java.util.ArrayList;
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import java.util.List;
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import javax.sql.DataSource;
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import org.springframework.beans.factory.DisposableBean;
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import org.springframework.boot.autoconfigure.orm.jpa.HibernateProperties;
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import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
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import org.springframework.stereotype.Component;
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@Component
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public final class DualityViewBuilder implements DisposableBean {
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private final DataSource dataSource;
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private final boolean isShowSql;
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private final RootSnippet rootSnippet;
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private final List<String> dualityViews = new ArrayList<>();
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public DualityViewBuilder(DataSource dataSource,
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JpaProperties jpaProperties,
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HibernateProperties hibernateProperties) {
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this.dataSource = dataSource;
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this.isShowSql = jpaProperties.isShowSql();
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this.rootSnippet = RootSnippet.fromDdlAuto(
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hibernateProperties.getDdlAuto()
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);
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}
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void build(Class<?> javaType, JsonRelationalDualityView dvAnnotation) {
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if (rootSnippet.equals(RootSnippet.NONE)) {
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return;
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}
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ViewEntity ve = new ViewEntity(javaType, new StringBuilder(), rootSnippet, 0);
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String ddl = ve.build().toString();
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if (isShowSql) {
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// TODO: log sql statement
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}
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if (rootSnippet.equals(RootSnippet.VALIDATE)) {
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// TODO: handle duality view validation
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return;
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}
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runDDL(ddl);
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}
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private void runDDL(String ddl) {
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try (Connection conn = dataSource.getConnection();
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Statement stmt = conn.createStatement()) {
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stmt.executeUpdate(ddl);
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} catch (SQLException e) {
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throw new RuntimeException(e);
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}
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}
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@Override
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public void destroy() throws Exception {
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if (rootSnippet.equals(RootSnippet.CREATE_DROP) && !dualityViews.isEmpty()) {
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final String dropView = """
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drop view %s
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""";
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try (Connection conn = dataSource.getConnection();
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Statement stmt = conn.createStatement()) {
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for (String view : dualityViews) {
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stmt.execute(dropView.formatted(view));
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}
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}
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}
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}
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}

‎database/starters/oracle-spring-boot-json-relational-duality-views/src/main/java/com/oracle/spring/json/duality/builder/DualityViewScanner.java

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package com.oracle.spring.json.duality.builder;
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import java.util.Set;
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import jakarta.annotation.PostConstruct;
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import jakarta.persistence.EntityManager;
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import jakarta.persistence.metamodel.EntityType;
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import org.springframework.stereotype.Component;
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@Component
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final public class DualityViewScanner {
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private final DualityViewBuilder dualityViewBuilder;
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private final EntityManager entityManager;
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public DualityViewScanner(DualityViewBuilder dualityViewBuilder, EntityManager entityManager) {
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this.dualityViewBuilder = dualityViewBuilder;
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this.entityManager = entityManager;
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}
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@PostConstruct
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public void scan() {
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Set<EntityType<?>> entities = entityManager.getMetamodel().getEntities();
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for (EntityType<?> entityType : entities) {
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Class<?> javaType = entityType.getJavaType();
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JsonRelationalDualityView dvAnnotation = javaType.getAnnotation(JsonRelationalDualityView.class);
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if (dvAnnotation != null) {
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dualityViewBuilder.build(javaType, dvAnnotation);
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}
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}
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}
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}

‎database/starters/oracle-spring-boot-json-relational-duality-views/src/main/java/com/oracle/spring/json/duality/builder/JsonRelationalDualityView.java

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package com.oracle.spring.json.duality.builder;
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import java.lang.annotation.Documented;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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@Documented
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@Target({ElementType.TYPE})
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@Retention(RetentionPolicy.RUNTIME)
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public @interface JsonRelationalDualityView {
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String name() default "";
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}

‎database/starters/oracle-spring-boot-json-relational-duality-views/src/main/java/com/oracle/spring/json/duality/builder/RootSnippet.java

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package com.oracle.spring.json.duality.builder;
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public enum RootSnippet {
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NONE(null),
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VALIDATE(null),
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CREATE("create force editionable json relational duality view"),
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CREATE_DROP(CREATE.snippet),
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UPDATE("create or replace force editionable json relational duality view");
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private final String snippet;
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RootSnippet(String snippet) {
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this.snippet = snippet;
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}
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public String getSnippet() {
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return snippet;
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}
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public static RootSnippet fromDdlAuto(String ddlAuto) {
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if (ddlAuto == null) {
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return NONE;
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}
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// none, validate, update, create, and create-drop
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return switch (ddlAuto) {
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case "none" -> NONE;
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case "validate" -> VALIDATE;
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case "create" -> CREATE;
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case "create_drop" -> CREATE_DROP;
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case "update" -> UPDATE;
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default -> throw new IllegalStateException("Unexpected value: " + ddlAuto);
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};
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}
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}

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