com.blazebit.persistence.Queryable Maven / Gradle / Ivy

/*
 * Copyright 2014 - 2020 Blazebit.
 *
 * 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.blazebit.persistence;

import javax.persistence.TypedQuery;
import java.util.List;

/**
 * A base interface for builders that querying.
 *
 * @param  The query result type
 * @param  The concrete builder type
 * @author Christian Beikov
 * @since 1.1.0
 */
public interface Queryable> {

    /**
     * Returns the query string for the built query.
     *
     * @return The query string
     */
    public String getQueryString();

    /**
     * Returns the JPA typed query for the built query.
     * The returned query is already parameterized with all known parameters.
     *
     * @return The typed query for the built query
     */
    public TypedQuery getQuery();

    /**
     * Execute the query and return the result as a type List.
     *
     * @return The list of the results
     */
    public List getResultList();

    /**
     * Execute the query expecting a single result.
     *
     * @return The single result
     */
    public T getSingleResult();

}