六 Repository接口

Repository接口是SpringDataJPA中爲我們提供的所有接口中的頂層接口。

Repository提供了兩種查詢方式的支持：

基於方法名稱規則查詢
基於@Query註解查詢

創建項目04-spring-data-jpa-repository

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>04-spring-data-jpa-repository</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 方法名稱命名規則查詢

1.1 規則：findBy（關鍵字） + 屬性名稱（屬性名稱的首字母大寫）+ 查詢條件（首字母大寫）

方法名稱命名規則
關鍵字	方法命名	sql where 子句
And	findByNameAndPwd	where name= ? and pwd= ?
Or	findByNameOrSex	where name= ? or sex= ?
Is,Equal	findById,findByIdIs,findByIdEqual	where id = ?
Between	findByIdBetween	where id between ? and ?
LessThan	findByIdLessThan	where id < ?
LessThanEqual	findByIdLessThanEqual	where id <= ?
GreaterThan	findByIdGreaterThan	where id > ?
GreaterThanEqual	findByIdGreaterThanEqual	where id >= ?
After	findByIdAfter	where id > ?
Before	findByIdBefore	where id < ?
IsNull	findByNameIsNull	where name is null
IsNotNull, NotNull	findByNameNotNull	where name is not null
Like	findByNameLike	where name like ?
NotLike	findByNameNotLike	where name not like ?
StartingWith	findByNameStartingWith	where name like '?%'
EndWith	findByNameEndWith	where name like '%?'
Containing	findByNameContaining	where name like '%?%'
OrderBy	findByIdOrderByXDesc	where id = ? order by x desc
Not	findByNameNot	where name <> ?
In	findByIdIn(Collection<?> c)	where id in (?)
NotIn	findByIdNotIn(Collection<?> c)	where id not in (?)
True	findByAaaTrue	where aaa = true
False	findByAaaFalse	where aaa = false
IgnoreCase	findByNameIgnoreCase	where UPPER(name) = UPPER(?)

缺點：如果查詢條件多的話，會導致方法名稱特長。

2 編寫dao

package com.bjsxt.dao;

import java.util.List;

import org.springframework.data.repository.Repository;

import com.bjsxt.pojo.Users;

public interface UsersDao extends Repository<Users, Long> {
	List<Users> findByUserNameIs(String userName);

	List<Users> findByUserNameLike(String userName);
	
	List<Users> findByUserNameIsNotNull();
}

3 編寫測試類

package com.bjsxt.dao.impl;

import java.util.List;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.bjsxt.dao.UsersDao;
import com.bjsxt.pojo.Users;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class RepositoryTest {

	@Autowired
	private UsersDao usersDao;

	/**
	 * Users(id=5, userName=路飛-海賊王, age=28)
	 */
	@Test
	public void test1() {
		/**
		 * 判斷相等的條件，有三種方式表示： 1 什麼都不寫，默認的就是相等判斷 2 IS 3 Equal
		 */
		List<Users> userList = this.usersDao.findByUserNameIs("路飛-海賊王");
		for (Users users : userList) {
			System.out.println(users);
		}
	}

	/**
	 * 根據username做模糊查詢 Users(id=5, userName=路飛-海賊王, age=28)
	 */
	@Test
	public void test2() {
		List<Users> userList = this.usersDao.findByUserNameLike("路飛%");
		for (Users users : userList) {
			System.out.println(users);
		}
	}

	/**
	 * Hibernate: select users0_.id as id1_0_, users0_.age as age2_0_,
	 * users0_.user_name as user_nam3_0_ from ts_users users0_ where
	 * users0_.user_name is not null
	 */
	@Test
	public void test3() {
		List<Users> userList = this.usersDao.findByUserNameIsNotNull();
		for (Users users : userList) {
			System.out.println(users);
		}
	}

}

2 基於@Query註解的查詢

2.1 通過JPQL語句查詢

JPQL:通過Hibernate的HQL演變而來，它和HQL語法及其相似；如：@Query(value = "from Users where userName = ?")

2.2 通過SQL語句查詢

如：@Query(value = "select * from ts_users where user_name = ?", nativeQuery = true)

編寫dao

package com.bjsxt.dao;

import java.util.List;

import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.Repository;

import com.bjsxt.pojo.Users;

/**
 * 基於@Query註解的查詢
 * 
 * @author guozi
 *
 */
public interface UsersDaoByQueryAnnotation extends Repository<Users, Long> {

	@Query(value = "from Users where userName = ?")
	List<Users> queryByUserNameUseJPQL(String userName);

	@Query(value = "from Users where userName like ?")
	List<Users> queryByUserNameLikeUseJPQL(String userName);

	@Query(value = "from Users where userName = ? and age = ?")
	List<Users> queryByUserNameAndAge(String userName, Integer age);

	/**
	 * nativeQuery:默認是false，表示不開啓sql查詢，表示是否對value中的語句做轉義
	 */
	@Query(value = "select * from ts_users where user_name = ?", nativeQuery = true)
	List<Users> queryByUserNameUseSQL(String userName);
	

	@Query(value = "select * from ts_users where user_name like ?", nativeQuery = true)
	List<Users> queryByUserNameLikeUseSQL(String userName);

	@Query(value = "select * from ts_users where user_name = ? and age = ?", nativeQuery = true)
	List<Users> queryByUserNameAndAgeUseSQL(String userName, Integer age);
}

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.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.bjsxt.pojo.Users;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class UsersDaoByQueryAnnotationTest {

	@Autowired
	private UsersDaoByQueryAnnotation usersDaoByQueryAnnotation;

	/**
	 * Hibernate: select users0_.id as id1_0_, users0_.age as age2_0_,
	 * users0_.user_name as user_nam3_0_ from ts_users users0_ where
	 * users0_.user_name=?
	 */
	@Test
	public void testQueryByUserNameUseJPQL() {
		List<Users> userList = this.usersDaoByQueryAnnotation.queryByUserNameUseJPQL("路飛-海賊王");
		for (Users users : userList) {
			System.out.println(users);
		}
	}

	/**
	 * Hibernate: select users0_.id as id1_0_, users0_.age as age2_0_,
	 * users0_.user_name as user_nam3_0_ from ts_users users0_ where
	 * users0_.user_name like ?
	 * 
	 */
	@Test
	public void testQueryByUserNameLikeUseJPQL() {
		List<Users> userList = this.usersDaoByQueryAnnotation.queryByUserNameLikeUseJPQL("路飛%");
		for (Users users : userList) {
			System.out.println(users);
		}
	}

	/**
	 * Hibernate: select users0_.id as id1_0_, users0_.age as age2_0_,
	 * users0_.user_name as user_nam3_0_ from ts_users users0_ where
	 * users0_.user_name=? and users0_.age=?
	 * 
	 */
	@Test
	public void testQueryByUserNameAndAge() {
		List<Users> userList = this.usersDaoByQueryAnnotation.queryByUserNameAndAge("路飛-海賊王", 28);
		for (Users users : userList) {
			System.out.println(users);
		}
	}

	/**
	 * Hibernate: select * from ts_users where user_name = ?
	 */
	@Test
	public void testQueryByUserNameUseSQL() {
		List<Users> userList = this.usersDaoByQueryAnnotation.queryByUserNameUseSQL("路飛-海賊王");
		for (Users users : userList) {
			System.out.println(users);
		}
	}

	/**
	 * Hibernate: select * from ts_users where user_name like ?
	 */
	@Test
	public void testQueryByUserNameLikeUseSQL() {
		List<Users> userList = this.usersDaoByQueryAnnotation.queryByUserNameLikeUseSQL("路飛%");
		for (Users users : userList) {
			System.out.println(users);
		}
	}

	/**
	 * Hibernate: select * from ts_users where user_name = ? and age = ?
	 */
	@Test
	public void testQueryByUserNameAndAgeSQL() {
		List<Users> userList = this.usersDaoByQueryAnnotation.queryByUserNameAndAgeUseSQL("路飛-海賊王", 28);
		for (Users users : userList) {
			System.out.println(users);
		}
	}

}

3 @Query更新操作

創建dao接口

package com.bjsxt.dao;

import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.Repository;

import com.bjsxt.pojo.Users;

/**
 * 基於@Query註解的更新操作
 * 
 * @author guozi
 *
 */
public interface UsersDaoByQueryAnnotationUpdate extends Repository<Users, Long> {

	@Query(value = "update Users set age = ? where id = ?")
	@Modifying // 表示當前是一個更新語句
	void updateAgeById(Integer age, Long id);
}

創建測試類

package com.bjsxt.dao;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.annotation.Rollback;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.transaction.annotation.Transactional;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class UsersDaoByQueryAnnotationUpdateTest {

	@Autowired
	private UsersDaoByQueryAnnotationUpdate usersDaoByQueryAnnotationUpdate;

	/**
	 * Hibernate: update ts_users set age=? where id=?
	 * 1 不加@Transactional會拋異常：Caused by: javax.persistence.TransactionRequiredException: Executing an update/delete query
	 * 2 在測試方法中，如果使用事務，不加@Rollback(false)會默認回滾
	 */
	@Test
	@Transactional
	@Rollback(false)
	public void testUpdateAgeById() {
		this.usersDaoByQueryAnnotationUpdate.updateAgeById(18, 5l);
	}

}

六 Repository接口

1 方法名稱命名規則查詢

2 基於@Query註解的查詢

3 @Query更新操作

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