八 PagingAndSortingRepository接口

創建項目06-spring-data-jpa-pagingandsortingrepository

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.bjsxt</groupId>
	<artifactId>06-spring-data-jpa-pagingandsortingrepository</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<properties>
		<java.version>1.8</java.version>
		<spring.version>4.3.23.RELEASE</spring.version>
		<hibernate.version>5.1.17.Final</hibernate.version>
		<mysql.version>5.1.47</mysql.version>
		<c3p0.version>0.9.2.1</c3p0.version>
		<junit.version>4.12</junit.version>
		<lombok.version>1.18.6</lombok.version>
		<hibernate-entitymanager.version>5.0.7.Final</hibernate-entitymanager.version>
		<spring-data-jpa.version>1.7.0.RELEASE</spring-data-jpa.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-core</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aspects</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aop</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-jdbc</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-orm</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-core</artifactId>
			<version>${hibernate.version}</version>
		</dependency>

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>${mysql.version}</version>
		</dependency>

		<dependency>
			<groupId>com.mchange</groupId>
			<artifactId>c3p0</artifactId>
			<version>${c3p0.version}</version>
		</dependency>

		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>${junit.version}</version>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<version>${lombok.version}</version>
			<scope>provided</scope>
		</dependency>

		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-entitymanager</artifactId>
			<version>${hibernate-entitymanager.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework.data</groupId>
			<artifactId>spring-data-jpa</artifactId>
			<version>${spring-data-jpa.version}</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/log4j/log4j -->
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.17</version>
		</dependency>

	</dependencies>
</project>

jdbc.properties

jdbc.url=jdbc:mysql://localhost:3306/spring-data-test?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT
#jdbc.url=jdbc:mysql://localhost:3306/spring-data-test 這個保存到數據庫中會導致亂碼
jdbc.driver.class=com.mysql.jdbc.Driver
jdbc.username=root
jdbc.password=123456

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:jpa="http://www.springframework.org/schema/data/jpa"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
		http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.11.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">

	<!-- 配置讀取properties文件的工具類 -->
	<context:property-placeholder location="classpath:jdbc.properties" />

	<!-- 配置c3p0數據庫連接池 -->
	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<property name="jdbcUrl" value="${jdbc.url}" />
		<property name="driverClass" value="${jdbc.driver.class}" />
		<property name="user" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
	</bean>

	<!-- spring整合jpa 配置EntityManagerFactory -->
	<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<property name="jpaVendorAdapter">
			<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
				<!-- hibernate相關的屬性注入 -->
				<!-- 配置數據庫類型 -->
				<property name="database" value="MYSQL" />
				<!-- 正向工程自動創建表 -->
				<property name="generateDdl" value="true" />
				<!-- 顯示執行的sql -->
				<property name="showSql" value="true" />
			</bean>
		</property>
		
		<!-- 配置掃描實體的包 -->
		<property name="packagesToScan">
			<list>
				<value>com.bjsxt.pojo</value>
			</list>
		</property>
	</bean>
	
	<!-- 配置hibernate的事務管理器 -->
	<bean id="transactionManager"
		class="org.springframework.orm.jpa.JpaTransactionManager">
		<property name="entityManagerFactory" ref="entityManagerFactory" />
	</bean>

	<!-- 配置開啓註解事務處理 -->
	<tx:annotation-driven transaction-manager="transactionManager"/>

	<!-- 配置springIOC的註解掃描 -->
	<context:component-scan base-package="com.bjsxt"></context:component-scan>
	
	<!-- Spring Data JPA的配置 base-package掃描dao接口所在的包 -->
	<jpa:repositories base-package="com.bjsxt.dao"></jpa:repositories>
</beans>

1 分頁處理

編寫dao接口

/**
 * PagingAndSortingRepository接口使用
 * @author guozi
 *
 */
public interface UsersDao extends PagingAndSortingRepository<Users, Long> {
	
}

編寫測試類

package com.bjsxt.dao;

import java.util.List;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.bjsxt.pojo.Users;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class UsersDaoTest {
	
	@Autowired
	private UsersDao usersDao;

	/**
	 * 	Hibernate: select count(users0_.id) as col_0_0_ from ts_users users0_
		Hibernate: select users0_.id as id1_0_, users0_.age as age2_0_, users0_.user_name as user_nam3_0_ from ts_users users0_ limit ?
		數據的總條數：8
		數據的總頁數：4
		Users(id=4, userName=??, age=18)
		Users(id=5, userName=路飛-海賊王, age=18)
	 */
	@Test
	public void testPaging() {
		int page = 0; // page當前頁的索引，注意索引是從0開始的
		int size = 2; // size表示每頁顯示的數據條數
		Pageable pageable = new PageRequest(page, size);
		Page<Users> userPage = this.usersDao.findAll(pageable);
		System.out.println("數據的總條數：" + userPage.getTotalElements());
		System.out.println("數據的總頁數：" + userPage.getTotalPages());
		List<Users> userList = userPage.getContent();
		for (Users users : userList) {
			System.out.println(users);
		}
	}

}

2 排序處理

	/**
	 * 單列排序
	 * 	Hibernate: select users0_.id as id1_0_, users0_.age as age2_0_, users0_.user_name as user_nam3_0_ from ts_users users0_ order by users0_.id desc
		Users(id=13, userName=布洛克, age=89)
		Users(id=12, userName=弗蘭奇, age=20)
		Users(id=11, userName=羅賓, age=19)
		Users(id=10, userName=娜美, age=18)
		Users(id=9, userName=烏索普, age=27)
		Users(id=6, userName=索羅-二把手, age=28)
		Users(id=5, userName=路飛-海賊王, age=18)
		Users(id=4, userName=??, age=18)
	 */
	@Test
	public void testSortOne() {
		/**
		 * Sort：該對象封裝了排序規則及指定的排序字段
		 * direction:排序規則
		 * properties：指定做排序的屬性（實體對象的屬性名）
		 */
		Sort sort = new Sort(Direction.DESC, "id");
		List<Users> userList = (List<Users>) this.usersDao.findAll(sort);
		for (Users users : userList) {
			System.out.println(users);
		}
	}
	
	/**
	 * 多列排序
	 * 	Hibernate: select users0_.id as id1_0_, users0_.age as age2_0_, users0_.user_name as user_nam3_0_ from ts_users users0_ order by users0_.age asc, users0_.id desc
		Users(id=10, userName=娜美, age=18)
		Users(id=5, userName=路飛-海賊王, age=18)
		Users(id=4, userName=??, age=18)
		Users(id=11, userName=羅賓, age=19)
		Users(id=12, userName=弗蘭奇, age=20)
		Users(id=9, userName=烏索普, age=27)
		Users(id=6, userName=索羅-二把手, age=28)
		Users(id=13, userName=布洛克, age=89)
	 */
	@Test
	public void testSortMulti() {
		/**
		 * Sort：該對象封裝了排序規則及指定的排序字段
		 * direction:排序規則
		 * properties：指定做排序的屬性（實體對象的屬性名）
		 */
		Order orderAge = new Order(Direction.ASC, "age");
		Order orderId = new Order(Direction.DESC, "id");
		Sort sort = new Sort(orderAge, orderId);
		List<Users> userList = (List<Users>) this.usersDao.findAll(sort);
		for (Users users : userList) {
			System.out.println(users);
		}
	}