org.apache.ibatis.cursor.Cursor Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of mybatis Show documentation

The MyBatis SQL mapper framework makes it easier to use a relational database with object-oriented applications. MyBatis couples objects with stored procedures or SQL statements using a XML descriptor or annotations. Simplicity is the biggest advantage of the MyBatis data mapper over object relational mapping tools.

There is a newer version: 3.5.16

Show newest version

/**
 *    Copyright 2009-2015 the original author or authors.
 *
 *    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 org.apache.ibatis.cursor;

import java.io.Closeable;

/**
 * Cursor contract to handle fetching items lazily using an Iterator.
 * Cursors are a perfect fit to handle millions of items queries that would not normally fits in memory.
 * Cursor SQL queries must be ordered (resultOrdered="true") using the id columns of the resultMap.
 *
 * @author Guillaume Darmont / [email protected]
 */
public interface Cursor extends Closeable, Iterable {

    /**
     * @return true if the cursor has started to fetch items from database.
     */
    boolean isOpen();

    /**
     *
     * @return true if the cursor is fully consumed and has returned all elements matching the query.
     */
    boolean isConsumed();

    /**
     * Get the current item index. The first item has the index 0.
     * @return -1 if the first cursor item has not been retrieved. The index of the current item retrieved.
     */
    int getCurrentIndex();
}