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/*
 * Copyright (c) 2009-2016, Data Geekery GmbH (http://www.datageekery.com)
 * All rights reserved.
 *
 * 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.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses for this work are available. These replace the above
 * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
 * database integrations.
 *
 * For more information, please visit: http://www.jooq.org/licenses
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */
package org.jooq;

// ...
import static org.jooq.SQLDialect.FIREBIRD;
// ...
import static org.jooq.SQLDialect.POSTGRES;

import java.util.Optional;

import org.jooq.exception.DataAccessException;

/**
 * This type is used for the {@link Delete}'s DSL API.
 * 
 * Example: 
 * DSLContext create = DSL.using(configuration);
 *
 * create.delete(table)
 *       .where(field1.greaterThan(100))
 *       .execute();
 * 
 * 
 * This implemented differently for every dialect:
 * 

 * Firebird and Postgres have native support for
 * UPDATE .. RETURNING clauses
 * DB2 allows to execute
 * SELECT .. FROM FINAL TABLE (DELETE ...)
 * 
 *
 * @author Lukas Eder
 */
public interface DeleteResultStep extends Delete {

    /**
     * The result holding returned values as specified by the
     * {@link UpdateReturningStep}.
     *
     * @return The returned values as specified by the
     *         {@link UpdateReturningStep}. Note:
     *         
     *         Not all databases / JDBC drivers support returning several
     *         values on multi-row inserts!
     *         This may return an empty Result in case jOOQ
     *         could not retrieve any generated keys from the JDBC driver.
     *         
     * @throws DataAccessException if something went wrong executing the query
     * @see UpdateQuery#getReturnedRecords()
     */
    @Support({ FIREBIRD, POSTGRES })
    Result fetch() throws DataAccessException;

    /**
     * The record holding returned values as specified by the
     * {@link UpdateReturningStep}.
     *
     * @return The returned value as specified by the
     *         {@link UpdateReturningStep}. This may return null in
     *         case jOOQ could not retrieve any generated keys from the JDBC
     *         driver.
     * @throws DataAccessException if something went wrong executing the query
     * @see UpdateQuery#getReturnedRecord()
     */
    @Support({ FIREBIRD, POSTGRES })
    R fetchOne() throws DataAccessException;


    /**
     * The record holding returned values as specified by the
     * {@link UpdateReturningStep}.
     *
     * @return The returned value as specified by the
     *         {@link UpdateReturningStep}
     * @throws DataAccessException if something went wrong executing the query
     * @see UpdateQuery#getReturnedRecord()
     */
    @Support({ FIREBIRD, POSTGRES })
    Optional fetchOptional() throws DataAccessException;

}