/
Cursor.java
45 lines (40 loc) · 1.58 KB
/
Cursor.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
/*
* Copyright 2009-2023 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
*
* https://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 fit in memory. If you use collections in resultMaps then cursor SQL queries
* must be ordered (resultOrdered="true") using the id columns of the resultMap.
*
* @author Guillaume Darmont / guillaume@dropinocean.com
*/
public interface Cursor<T> extends Closeable, Iterable<T> {
/**
* @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();
}