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Jakarta Persistence 3.2 new feature - JPQL functions ID(), VERSION() (e…
…clipse-ee4j#2108) Implementation plus unit test according jakartaee/persistence#596 There are two new JPQL functions: - `ID(...)` to fetch Entity `@Id` value. There is support for single or composite primary key - `VERSION(...)` to fetch attribute value from attribute marked by `@Version` annotation These functions are specific as they are exist in JPQL only, but not in SQL like other JPQL functions where are usually similar SQL function/procedure at the DB side. Signed-off-by: Radek Felcman <radek.felcman@oracle.com>
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...src/main/java/org/eclipse/persistence/internal/jpa/jpql/JPQLFunctionsAbstractBuilder.java
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| /* | ||
| * Copyright (c) 2024 Oracle and/or its affiliates. All rights reserved. | ||
| * | ||
| * This program and the accompanying materials are made available under the | ||
| * terms of the Eclipse Public License v. 2.0 which is available at | ||
| * http://www.eclipse.org/legal/epl-2.0, | ||
| * or the Eclipse Distribution License v. 1.0 which is available at | ||
| * http://www.eclipse.org/org/documents/edl-v10.php. | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause | ||
| */ | ||
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| // Contributors: | ||
| // Oracle - initial API and implementation | ||
| // | ||
| package org.eclipse.persistence.internal.jpa.jpql; | ||
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| import org.eclipse.persistence.descriptors.ClassDescriptor; | ||
| import org.eclipse.persistence.descriptors.VersionLockingPolicy; | ||
| import org.eclipse.persistence.internal.helper.DatabaseField; | ||
| import org.eclipse.persistence.jpa.jpql.parser.EclipseLinkAnonymousExpressionVisitor; | ||
| import org.eclipse.persistence.jpa.jpql.parser.IdExpression; | ||
| import org.eclipse.persistence.jpa.jpql.parser.IdentificationVariable; | ||
| import org.eclipse.persistence.jpa.jpql.parser.StateFieldPathExpression; | ||
| import org.eclipse.persistence.jpa.jpql.parser.VersionExpression; | ||
| import org.eclipse.persistence.mappings.DatabaseMapping; | ||
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| import java.util.List; | ||
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| /** | ||
| * JPQL exclusive ID(), VERSION() functions/expressions are transformed there to StateFieldPathExpression. | ||
| * It should be used in the future for another JPQL functions/expressions which are not available at the DB level. | ||
| * E.g. For Entity e with idAttr as a primary key: <code>SELECT ID(e) FROM Entity e -> SELECT e.idAttr FROM Entity e</code> | ||
| * For Entity e with versionAttr as a version attribute: <code>SELECT VERSION(e) FROM Entity e -> SELECT e.versionAttr FROM Entity e</code> | ||
| * | ||
| * @author Radek Felcman | ||
| * @since 5.0 | ||
| */ | ||
| public abstract class JPQLFunctionsAbstractBuilder extends EclipseLinkAnonymousExpressionVisitor { | ||
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| /** | ||
| * The {@link JPQLQueryContext} is used to query information about the application metadata and | ||
| * cached information. | ||
| */ | ||
| final JPQLQueryContext queryContext; | ||
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| protected JPQLFunctionsAbstractBuilder(JPQLQueryContext queryContext) { | ||
| this.queryContext = queryContext; | ||
| } | ||
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| /** | ||
| * For Entity e with idAttr as a primary key: <code>SELECT ID(e) FROM Entity e -> SELECT e.idAttr FROM Entity e</code> | ||
| * | ||
| * @param expression The {@link IdExpression} to visit | ||
| */ | ||
| @Override | ||
| public void visit(IdExpression expression) { | ||
| //Fetch identification variable info | ||
| IdentificationVariable identificationVariable = (IdentificationVariable) expression.getExpression(); | ||
| String variableText = identificationVariable.getText(); | ||
| String variableName = identificationVariable.getVariableName(); | ||
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| //Get id attribute name | ||
| ClassDescriptor descriptor = this.queryContext.getDeclaration(variableName).getDescriptor(); | ||
| List<DatabaseField> primaryKeyFields = descriptor.getPrimaryKeyFields(); | ||
| String idAttributeName = getIdAttributeNameByField(descriptor.getMappings(), primaryKeyFields.get(0)); | ||
| StateFieldPathExpression stateFieldPathExpression = new StateFieldPathExpression(expression.getParent(), variableText + "." + idAttributeName); | ||
| expression.setStateFieldPathExpression(stateFieldPathExpression); | ||
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| //Continue with created StateFieldPathExpression | ||
| //It handle by ObjectBuilder booth @Id/primary key types (simple/composite) | ||
| expression.getStateFieldPathExpression().accept(this); | ||
| } | ||
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| /** | ||
| * For Entity e with versionAttr as a version attribute: <code>SELECT VERSION(e) FROM Entity e -> SELECT e.versionAttr FROM Entity e</code> | ||
| * | ||
| * @param expression The {@link VersionExpression} to visit | ||
| */ | ||
| @Override | ||
| public void visit(VersionExpression expression) { | ||
| //Fetch identification variable info | ||
| IdentificationVariable identificationVariable = (IdentificationVariable) expression.getExpression(); | ||
| String variableText = identificationVariable.getText(); | ||
| String variableName = identificationVariable.getVariableName(); | ||
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| //Get version attribute name | ||
| ClassDescriptor descriptor = this.queryContext.getDeclaration(variableName).getDescriptor(); | ||
| String versionAttributeName = ((VersionLockingPolicy) descriptor.getOptimisticLockingPolicy()).getVersionMapping().getAttributeName(); | ||
| StateFieldPathExpression stateFieldPathExpression = new StateFieldPathExpression(expression.getParent(), variableText + "." + versionAttributeName); | ||
| expression.setStateFieldPathExpression(stateFieldPathExpression); | ||
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| //Continue with created StateFieldPathExpression | ||
| expression.getStateFieldPathExpression().accept(this); | ||
| } | ||
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| private String getIdAttributeNameByField(List<DatabaseMapping> databaseMappings, DatabaseField field) { | ||
| for (DatabaseMapping mapping : databaseMappings) { | ||
| if (field.equals(mapping.getField()) || mapping.isPrimaryKeyMapping()) { | ||
| return mapping.getAttributeName(); | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
| } |
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