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package org.apache.cayenne.query;

/**
 * A factory interface to create standard SQLActions for a set of standard queries.
 * Instances of SQLActionVisitor are passed by Cayenne to a Query in
 * {@link org.apache.cayenne.query.Query#createSQLAction(SQLActionVisitor)},
 * allowing query to choose the action type and convert itself to a "standard" query if
 * needed. Individual DbAdapters would provide special visitors, thus allowing for
 * DB-dependent execution algorithms.
 * 
 * @see org.apache.cayenne.query.Query#createSQLAction(SQLActionVisitor)
 * @since 1.2
 * @author Andrus Adamchik
 */
public interface SQLActionVisitor {

    /**
     * Executes a generic update query.
     */
    SQLAction updateAction(Query query);

    /**
     * Executes a batch update query.
     */
    SQLAction batchAction(BatchQuery query);

    /**
     * Executes a SelectQuery.
     */
    SQLAction objectSelectAction(SelectQuery query);

    /**
     * Executes a SQLTemplate.
     */
    SQLAction sqlAction(SQLTemplate query);

    /**
     * Executes a ProcedureQuery.
     */
    SQLAction procedureAction(ProcedureQuery query);
}