Java tutorial
/* * The MIT License (MIT) * * Copyright (c) 2014 abel533@gmail.com * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package com.github.pagehelper.test.basic; import com.github.pagehelper.Page; import com.github.pagehelper.PageHelper; import com.github.pagehelper.mapper.CountryMapper; import com.github.pagehelper.model.Country; import com.github.pagehelper.util.MybatisHelper; import org.apache.ibatis.session.RowBounds; import org.apache.ibatis.session.SqlSession; import org.junit.Test; import java.util.List; import static org.junit.Assert.assertEquals; public class PageHelperTest { @Test public void shouldGetAllCountries() { SqlSession sqlSession = MybatisHelper.getSqlSession(); try { List<Country> list = sqlSession.selectList("selectAll"); assertEquals(183, list.size()); } finally { sqlSession.close(); } } /** * Mapper?PageHelper.startPage??Mapper?? */ @Test public void testMapperWithStartPage() { SqlSession sqlSession = MybatisHelper.getSqlSession(); CountryMapper countryMapper = sqlSession.getMapper(CountryMapper.class); try { //?110?count PageHelper.startPage(1, 10, "id desc"); List<Country> list = countryMapper.selectAll(); assertEquals(10, list.size()); assertEquals(183, ((Page<?>) list).getTotal()); //?210??count PageHelper.orderBy("countryname desc"); list = countryMapper.selectAll(); assertEquals(183, list.size()); assertEquals(183, ((Page<?>) list).getTotal()); //?210??count PageHelper.startPage(2, 10, false); PageHelper.orderBy("id asc"); list = countryMapper.selectAll(); assertEquals(10, list.size()); assertEquals(-1, ((Page<?>) list).getTotal()); //?320?count PageHelper.orderBy("countryname desc"); PageHelper.startPage(3, 20); list = countryMapper.selectAll(); assertEquals(20, list.size()); assertEquals(183, ((Page<?>) list).getTotal()); } finally { sqlSession.close(); } } /** * Mapper??RowBounds???xml?? * <p/> * RowBounds??count?Page? * <p/> * ??startPagestartPage */ @Test public void testMapperWithRowBounds() { SqlSession sqlSession = MybatisHelper.getSqlSession(); CountryMapper countryMapper = sqlSession.getMapper(CountryMapper.class); try { //?110?count List<Country> list = countryMapper.selectAll(new RowBounds(0, 10)); assertEquals(10, list.size()); assertEquals(-1, ((Page<?>) list).getTotal()); //?? assertEquals(1, list.get(0).getId()); assertEquals(10, list.get(list.size() - 1).getId()); //?210??count list = countryMapper.selectAll(new RowBounds(10, 10)); assertEquals(10, list.size()); assertEquals(-1, ((Page<?>) list).getTotal()); //?? assertEquals(11, list.get(0).getId()); assertEquals(20, list.get(list.size() - 1).getId()); //?320?count list = countryMapper.selectAll(new RowBounds(60, 20)); assertEquals(20, list.size()); assertEquals(-1, ((Page<?>) list).getTotal()); //?? assertEquals(61, list.get(0).getId()); assertEquals(80, list.get(list.size() - 1).getId()); //?startPageRowBoundsstartPage PageHelper.startPage(1, 20); list = countryMapper.selectAll(new RowBounds(60, 20)); assertEquals(20, list.size()); assertEquals(183, ((Page<?>) list).getTotal()); //?? assertEquals(1, list.get(0).getId()); assertEquals(20, list.get(list.size() - 1).getId()); } finally { sqlSession.close(); } } /** * ??PageHelper.startPage * <p/> * startPage??(true)?(false)countstartPagecount * <p/> * startPage?RowBoundsstartPage */ @Test public void testNamespaceWithStartPage() { SqlSession sqlSession = MybatisHelper.getSqlSession(); try { //?110?count PageHelper.startPage(1, 10); List<Country> list = sqlSession.selectList("selectAll"); assertEquals(10, list.size()); assertEquals(183, ((Page<?>) list).getTotal()); //?210??count PageHelper.startPage(2, 10, true); list = sqlSession.selectList("selectAll"); assertEquals(10, list.size()); assertEquals(183, ((Page<?>) list).getTotal()); //?210??count PageHelper.startPage(2, 10, false); list = sqlSession.selectList("selectAll"); assertEquals(10, list.size()); assertEquals(-1, ((Page<?>) list).getTotal()); //?320?count PageHelper.startPage(3, 20); list = sqlSession.selectList("selectAll"); assertEquals(20, list.size()); assertEquals(183, ((Page<?>) list).getTotal()); } finally { sqlSession.close(); } } /** * ???RowBoundsRowBounds?count * ??count?? * ?count?startPage * <p/> * ?startPagestartPage?startPage?? */ @Test public void testNamespaceWithRowBounds() { SqlSession sqlSession = MybatisHelper.getSqlSession(); try { //?010? List<Country> list = sqlSession.selectList("selectAll", null, new RowBounds(0, 10)); assertEquals(10, list.size()); assertEquals(-1, ((Page<?>) list).getTotal()); //?? assertEquals(1, list.get(0).getId()); assertEquals(10, list.get(list.size() - 1).getId()); //?1010? list = sqlSession.selectList("selectAll", null, new RowBounds(10, 10)); assertEquals(10, list.size()); assertEquals(-1, ((Page<?>) list).getTotal()); //?? assertEquals(11, list.get(0).getId()); assertEquals(20, list.get(list.size() - 1).getId()); //?2020? list = sqlSession.selectList("selectAll", null, new RowBounds(20, 20)); assertEquals(20, list.size()); assertEquals(-1, ((Page<?>) list).getTotal()); //?? assertEquals(21, list.get(0).getId()); assertEquals(40, list.get(list.size() - 1).getId()); //?startPageRowBoundsstartPage PageHelper.startPage(1, 20); list = sqlSession.selectList("selectAll", null, new RowBounds(0, 10)); assertEquals(20, list.size()); assertEquals(183, ((Page<?>) list).getTotal()); //?? assertEquals(1, list.get(0).getId()); assertEquals(20, list.get(list.size() - 1).getId()); } finally { sqlSession.close(); } } }