Java tutorial
/* * Copyright 2006-2012 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.springframework.batch.item.database; import static org.junit.Assert.assertEquals; import static org.junit.Assert.assertNotSame; import static org.junit.Assert.assertTrue; import java.util.ArrayList; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; import java.util.SortedMap; import java.util.TreeMap; import javax.sql.DataSource; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.junit.After; import org.junit.Before; import org.junit.Ignore; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.batch.item.database.support.AbstractSqlPagingQueryProvider; import org.springframework.batch.item.database.support.SqlPagingQueryProviderFactoryBean; import org.springframework.test.jdbc.JdbcTestUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; /** * @author Dave Syer * @author Michael Minella * @since 2.1 */ @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = "JdbcPagingItemReaderCommonTests-context.xml") public class JdbcPagingQueryIntegrationTests { private static Log logger = LogFactory.getLog(JdbcPagingQueryIntegrationTests.class); @Autowired private DataSource dataSource; private int maxId; private JdbcTemplate jdbcTemplate; private int itemCount = 9; private int pageSize = 2; @Before public void testInit() { jdbcTemplate = new JdbcTemplate(dataSource); String[] names = { "Foo", "Bar", "Baz", "Foo", "Bar", "Baz", "Foo", "Bar", "Baz" }; String[] codes = { "A", "B", "A", "B", "B", "B", "A", "B", "A" }; jdbcTemplate.update("DELETE from T_FOOS"); for (int i = 0; i < names.length; i++) { jdbcTemplate.update("INSERT into T_FOOS (ID,NAME, CODE, VALUE) values (?, ?, ?, ?)", maxId, names[i], codes[i], i); maxId++; } assertEquals(itemCount, JdbcTestUtils.countRowsInTable(jdbcTemplate, "T_FOOS")); } @After public void destroy() { jdbcTemplate.update("DELETE from T_FOOS"); } @Test public void testQueryFromStart() throws Exception { PagingQueryProvider queryProvider = getPagingQueryProvider(); int total = JdbcTestUtils.countRowsInTable(jdbcTemplate, "T_FOOS"); assertTrue(total > pageSize); int pages = total / pageSize; int count = 0; List<Map<String, Object>> list = jdbcTemplate.queryForList(queryProvider.generateFirstPageQuery(pageSize)); logger.debug("First page result: " + list); assertEquals(pageSize, list.size()); count += pageSize; Map<String, Object> oldValues = null; while (count < pages * pageSize) { Map<String, Object> startAfterValues = getStartAfterValues(queryProvider, list); assertNotSame(oldValues, startAfterValues); list = jdbcTemplate.queryForList(queryProvider.generateRemainingPagesQuery(pageSize), getParameterList(null, startAfterValues).toArray()); assertEquals(pageSize, list.size()); count += pageSize; oldValues = startAfterValues; } if (count < total) { Map<String, Object> startAfterValues = getStartAfterValues(queryProvider, list); list = jdbcTemplate.queryForList(queryProvider.generateRemainingPagesQuery(pageSize), getParameterList(null, startAfterValues).toArray()); assertEquals(total - pages * pageSize, list.size()); count += list.size(); } assertEquals(total, count); } @Test public void testQueryFromStartWithGroupBy() throws Exception { AbstractSqlPagingQueryProvider queryProvider = (AbstractSqlPagingQueryProvider) getPagingQueryProvider(); Map<String, Order> sortKeys = new LinkedHashMap<String, Order>(); sortKeys.put("NAME", Order.ASCENDING); sortKeys.put("CODE", Order.DESCENDING); queryProvider.setSortKeys(sortKeys); queryProvider.setSelectClause("select NAME, CODE, sum(VALUE)"); queryProvider.setGroupClause("NAME, CODE"); int count = 0; int total = 5; List<Map<String, Object>> list = jdbcTemplate.queryForList(queryProvider.generateFirstPageQuery(pageSize)); logger.debug("First page result: " + list); assertEquals(pageSize, list.size()); count += pageSize; Map<String, Object> oldValues = null; while (count < total) { Map<String, Object> startAfterValues = getStartAfterValues(queryProvider, list); assertNotSame(oldValues, startAfterValues); list = jdbcTemplate.queryForList(queryProvider.generateRemainingPagesQuery(pageSize), getParameterList(null, startAfterValues).toArray()); count += list.size(); if (list.size() < pageSize) { assertEquals(1, list.size()); } else { assertEquals(pageSize, list.size()); } oldValues = startAfterValues; } assertEquals(total, count); } private Map<String, Object> getStartAfterValues(PagingQueryProvider queryProvider, List<Map<String, Object>> list) { Map<String, Object> startAfterValues = new LinkedHashMap<String, Object>(); for (Map.Entry<String, Order> sortKey : queryProvider.getSortKeys().entrySet()) { startAfterValues.put(sortKey.getKey(), list.get(list.size() - 1).get(sortKey.getKey())); } return startAfterValues; } @Test @Ignore public void testJumpToItem() throws Exception { PagingQueryProvider queryProvider = getPagingQueryProvider(); int minId = jdbcTemplate.queryForObject("SELECT MIN(VALUE) FROM T_FOOS", Integer.class); String query = queryProvider.generateJumpToItemQuery(pageSize, pageSize); List<Map<String, Object>> list = jdbcTemplate.queryForList(query); logger.debug("Jump to page result: " + list); assertEquals(1, list.size()); System.err.println(list); String expected = "[{value=" + (minId + pageSize - 1); assertEquals(expected, list.toString().toLowerCase().substring(0, expected.length())); Object startAfterValue = list.get(0).entrySet().iterator().next().getValue(); list = jdbcTemplate.queryForList(queryProvider.generateRemainingPagesQuery(pageSize), startAfterValue); assertEquals(pageSize, list.size()); expected = "[{id=" + (minId + pageSize); } protected PagingQueryProvider getPagingQueryProvider() throws Exception { SqlPagingQueryProviderFactoryBean factory = new SqlPagingQueryProviderFactoryBean(); factory.setDataSource(dataSource); factory.setSelectClause("select ID, NAME, VALUE"); factory.setFromClause("from T_FOOS"); Map<String, Order> sortKeys = new LinkedHashMap<String, Order>(); sortKeys.put("VALUE", Order.ASCENDING); factory.setSortKeys(sortKeys); return factory.getObject(); } private List<Object> getParameterList(Map<String, Object> values, Map<String, Object> sortKeyValue) { SortedMap<String, Object> sm = new TreeMap<String, Object>(); if (values != null) { sm.putAll(values); } List<Object> parameterList = new ArrayList<Object>(); parameterList.addAll(sm.values()); if (sortKeyValue != null && sortKeyValue.size() > 0) { List<Map.Entry<String, Object>> keys = new ArrayList<Map.Entry<String, Object>>( sortKeyValue.entrySet()); for (int i = 0; i < keys.size(); i++) { for (int j = 0; j < i; j++) { parameterList.add(keys.get(j).getValue()); } parameterList.add(keys.get(i).getValue()); } } if (logger.isDebugEnabled()) { logger.debug("Using parameterList:" + parameterList); } return parameterList; } }