Select.java

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 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
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package org.jooq;

// ...
import static org.jooq.SQLDialect.CUBRID;
// ...
import static org.jooq.SQLDialect.DERBY;
import static org.jooq.SQLDialect.H2;
// ...
import static org.jooq.SQLDialect.HSQLDB;
// ...
// ...
import static org.jooq.SQLDialect.MARIADB;
import static org.jooq.SQLDialect.MYSQL;
// ...
import static org.jooq.SQLDialect.POSTGRES;
import static org.jooq.SQLDialect.SQLITE;
// ...
// ...
// ...

import java.util.List;

import org.jooq.exception.DataAccessException;

/**
 * A {@link Query} that can provide a {@link Result} after execution
 *
 * @param <R> The record type being returned by this query
 * @author Lukas Eder
 */
public interface Select<R extends Record> extends ResultQuery<R>, TableLike<R>, FieldLike {

    /**
     * Apply the <code>UNION</code> set operation.
     */
    @Support
    Select<R> union(Select<? extends R> select);

    /**
     * Apply the <code>UNION ALL</code> set operation.
     */
    @Support
    Select<R> unionAll(Select<? extends R> select);

    /**
     * Apply the <code>EXCEPT</code> (or <code>MINUS</code>) set operation.
     */
    @Support({ CUBRID, DERBY, H2, HSQLDB, MARIADB, MYSQL, POSTGRES, SQLITE })
    Select<R> except(Select<? extends R> select);

    /**
     * Apply the <code>EXCEPT ALL</code> set operation.
     */
    @Support({ CUBRID, DERBY, HSQLDB, POSTGRES })
    Select<R> exceptAll(Select<? extends R> select);

    /**
     * Apply the <code>INTERSECT</code> set operation.
     */
    @Support({ CUBRID, DERBY, H2, HSQLDB, MARIADB, MYSQL, POSTGRES, SQLITE })
    Select<R> intersect(Select<? extends R> select);

    /**
     * Apply the <code>INTERSECT ALL</code> set operation.
     */
    @Support({ CUBRID, DERBY, HSQLDB, POSTGRES })
    Select<R> intersectAll(Select<? extends R> select);

    /**
     * All fields selected in this query
     */
    List<Field<?>> getSelect();

    /**
     * Execute this query in the context of its attached executor and return a
     * <code>COUNT(*)</code> value.
     * <p>
     * This wraps a pre-existing <code>SELECT</code> query in another one to
     * calculate the <code>COUNT(*)</code> value, without modifying the original
     * <code>SELECT</code>. An example: <code><pre>
     * -- Original query:
     * SELECT id, title FROM book WHERE title LIKE '%a%'
     *
     * -- Wrapped query:
     * SELECT count(*) FROM (
     *   SELECT id, title FROM book WHERE title LIKE '%a%'
     * )
     * </pre></code> This is particularly useful for those databases that do not
     * support the <code>COUNT(*) OVER()</code> window function to calculate
     * total results in paged queries.
     *
     * @return The <code>COUNT(*)</code> result
     * @throws DataAccessException if something went wrong executing the query
     * @deprecated - 3.5.0 - [#3356] - This method is being removed as it is
     *             confusingly different from all the other types of
     *             {@link #fetch()} methods, in that it modifies the original
     *             {@link Select} statement by wrapping it. In particular, this
     *             method can be easily confused with {@link #fetch(Field)}, or
     *             more concretely <code>fetch(count())</code>, which has an
     *             entirely different semantics. Use
     *             {@link DSLContext#fetchCount(Select)} instead.
     */
    @Deprecated
    int fetchCount() throws DataAccessException;
}