com.querydsl.jpa.impl.JPADeleteClause Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of querydsl-jpa Show documentation
JPA support for Querydsl
There is a newer version: 6.10.1
/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * Licensed 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 com.querydsl.jpa.impl;

import com.querydsl.core.JoinType;
import com.querydsl.core.dml.DeleteClause;
import com.querydsl.core.support.QueryMixin;
import com.querydsl.core.types.EntityPath;
import com.querydsl.core.types.Predicate;
import com.querydsl.jpa.JPAQueryMixin;
import com.querydsl.jpa.JPQLSerializer;
import com.querydsl.jpa.JPQLTemplates;
import jakarta.persistence.EntityManager;
import jakarta.persistence.LockModeType;
import jakarta.persistence.Query;
import org.jetbrains.annotations.Nullable;

/**
 * DeleteClause implementation for JPA
 *
 * @author tiwe
 */
public class JPADeleteClause implements DeleteClause {

  private final QueryMixin queryMixin = new JPAQueryMixin();

  private final EntityManager entityManager;

  private final JPQLTemplates templates;

  @Nullable private LockModeType lockMode;

  public JPADeleteClause(EntityManager em, EntityPath entity) {
    this(em, entity, JPAProvider.getTemplates(em));
  }

  public JPADeleteClause(
      EntityManager entityManager, EntityPath entity, JPQLTemplates templates) {
    this.entityManager = entityManager;
    this.templates = templates;
    queryMixin.addJoin(JoinType.DEFAULT, entity);
  }

  @Override
  public long execute() {
    JPQLSerializer serializer = new JPQLSerializer(templates, entityManager);
    serializer.serializeForDelete(queryMixin.getMetadata());

    Query query = entityManager.createQuery(serializer.toString());
    if (lockMode != null) {
      query.setLockMode(lockMode);
    }
    JPAUtil.setConstants(query, serializer.getConstants(), queryMixin.getMetadata().getParams());
    return query.executeUpdate();
  }

  @Override
  public JPADeleteClause where(Predicate... o) {
    for (Predicate p : o) {
      queryMixin.where(p);
    }
    return this;
  }

  public JPADeleteClause setLockMode(LockModeType lockMode) {
    this.lockMode = lockMode;
    return this;
  }

  @Override
  public String toString() {
    JPQLSerializer serializer = new JPQLSerializer(templates, entityManager);
    serializer.serializeForDelete(queryMixin.getMetadata());
    return serializer.toString();
  }
}