RQSay 的技术小站
  • Dublin
  • °C ~ °C

“ SpringBoot整合JPA ”

发布时间：2023-07-22
今日阅读：0
来源：CSDN
作者：242030
...

SpringBoot整合JPA

1、Spring Data JPA概述

SpringDataSpring 的一个子项目。用于简化数据库访问，支持NoSQL 和 关系数据存储。其主要目标是使数据 库的访问变得方便快捷。 JPAJPA(Java Persistence API，Java持久化API)，定义了对象关系映射(Object Relation Mapping,ORM)以及实 体对象持久化的标准接口。Hibernate实现了JPA的一个ORM框架。 JPA Spring Data致力于减少数据访问层 (DAO) 的开发量，开发者唯一要做的，就只是声明持久层的接口， 其他都交给 Spring Data JPA 来完成。Spring Data JPA 是Spring基于ORM框架、JPA规范的基础上封装的一套JPA 应用框架。

2、SpringBoot整合JPA

2.1 建库建表

DROP TABLE IF EXISTS  student ;
CREATE TABLE  student  (
   id  int(11) NOT NULL AUTO_INCREMENT,
   name  varchar(100) DEFAULT NULL,
   sex  varchar(100) DEFAULT NULL,
   age  int(11) DEFAULT NULL,
  PRIMARY KEY ( id )
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

img

2.2 新建项目

目录结构如下 img

2.3 添加相关依赖

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.4</version>
        <relativePath/>
    </parent>
    <groupId>com.jpa.mysql</groupId>
    <artifactId>spring-data-jpa-mysql</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-data-jpa-mysql</name>
    <description>spring-data-jpa-mysql</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- jpa 依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <!-- lombok 依赖-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

2.4 修改application.properties配置文件

server.port=9000
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test
spring.datasource.username=root
spring.datasource.password=root
spring.jpa.show-sql=true
spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect

2.5 编写entity

package com.jpa.mysql.entity;
import lombok.Data;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import java.io.Serializable;
@Data
@Entity
@Table(name = "student")
public class Student implements Serializable {
    @Id
    @Column(name="id")
    private int id;
    @Column(name="name")
    private String name;
    @Column(name="sex")
    private String sex;
    @Column(name="age")
    private int age;
}

2.6 编写dao

package com.jpa.gbase.dao;
import com.jpa.gbase.entity.Student;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface StudentDao extends JpaRepository<Student, Integer> {
    List<Student> findByName(String name);
}

2.6 编写service接口

package com.jpa.gbase.service;
import com.jpa.gbase.entity.Student;
import org.springframework.stereotype.Component;
import java.util.List;
@Component
public interface IStudentService {
    Student findById(Integer id);
    List<Student> findAll();
    List<Student> findByName(String name);
    Student save(String name) throws Exception;
    void delete(Integer id) throws Exception;
}

2.7 编写service实现类

package com.jpa.gbase.service.impl;
import com.jpa.gbase.dao.StudentDao;
import com.jpa.gbase.entity.Student;
import com.jpa.gbase.service.IStudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;
@Component
public class StudentServiceImpl implements IStudentService {
    @Autowired
    private StudentDao studentDao;
    @Override
    public Student findById(Integer id) {
        return studentDao.findById(id).get();
    }
    @Override
    public List<Student> findAll() {
        return studentDao.findAll();
    }
    @Override
    public List<Student> findByName(String name) {
        return studentDao.findByName(name);
    }
    @Override
    @Transactional
    public Student save(String name) throws Exception {
        Student student = new Student();
        student.setName(name);
        student.setSex("M");
        student.setAge(18);
        return studentDao.save(student);
    }
    @Override
    @Transactional
    public void delete(Integer id) throws Exception {
        studentDao.deleteById(id);
    }
}

2.8 编写controller

package com.jpa.gbase.controller;
import com.jpa.gbase.entity.Student;
import com.jpa.gbase.service.IStudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
@RequestMapping(value = "/student")
public class StudentController {
    @Autowired
    private IStudentService studentService;
    @GetMapping(value = "/findById/{id}")
    public Student findById(@PathVariable("id") Integer id) {
        return studentService.findById(id);
    }
    @GetMapping(value = "/findAll")
    public List<Student> findAll() {
        return studentService.findAll();
    }
    @GetMapping(value = "/findByName/{name}")
    public List<Student> findByName(@PathVariable("name") String name) {
        return studentService.findByName(name);
    }
    @GetMapping(value = "/save/{name}")
    public Student save(@PathVariable("name") String name) {
        Student student = new Student();
        try {
            student = studentService.save(name);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return student;
    }
    @GetMapping(value = "/delete/{id}")
    public boolean delete(@PathVariable("id") Integer id) {
        boolean flg = false;
        try {
            studentService.delete(id);
            flg = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return flg;
    }
}

2.9 编写启动类

package com.jpa.mysql;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SpringDataJpaMysqlApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringDataJpaMysqlApplication.class, args);
    }
}

3.测试

3.1 添加数据

http://localhost:9000/student/save/tom

img

3.2 根据id查询数据

http://localhost:9000/student/findById/1

img

3.3 根据名字查询数据

http://localhost:9000/student/findByName/tom

img

3.4 根据id删除数据

http://localhost:9000/student/delete/1

img

3.5 查询全部数据

http://localhost:9000/student/save/tom1
http://localhost:9000/student/save/tom2
http://localhost:9000/student/save/tom3
http://localhost:9000/student/save/tom4
http://localhost:9000/student/save/tom5
http://localhost:9000/student/findAll

img

4、简单查询

基本查询也分为两种，一种是 Spring Data 默认已经实现，一种是根据查询的方法来自动解析成 SQL。

4.1 预先生成方法

Spring Boot Jpa 默认预先生成了一些基本的CURD的方法，例如增、删、改等等 1、继承 JpaRepository

@Repository
public interface StudentDao extends JpaRepository<Student, Integer> {
}

2、使用默认方法

@Autowired
private StudentDao studentDao;
studentDao.findAll();
studentDao.findOne(1l);
studentDao.save(user);
studentDao.delete(user);
studentDao.count();
studentDao.exists(1l);

4.2 自定义简单查询

自定义的简单查询就是根据方法名来自动生成 SQL。 主要的语法是 findByXX,readAByXX,queryByXX,countByXX, getByXX ，XX 代表属性名称。

Student findByName(String name);

也使用一些加一些关键字And 、 Or

User findByNameOrSex(String username, int sex);

修改、删除、统计也是类似语法

Long deleteById(Long id);
Long countByName(String mame);

基本上 SQL 体系中的关键词都可以使用，例如LIKE、 IgnoreCase、 OrderBy。

List<Student> findByNameLike(String name);
Student findByNameIgnoreCase(String name);
List<Student> findByNameOrderByAgeDesc(String name);

具体的关键字，使用方法和生产成SQL如下表所示 |Keyword|Sample|JPQL snippet| |:—-:|:—-:|:—-:| |And|findByLastnameAndFirstname| where x.lastname = ?1 and x.firstname = ?2| |Or|findByLastnameOrFirstname| where x.lastname = ?1 or x.firstname = ?2| |Is,Equals|findByFirstnameIs,findByFirstnameEquals| where x.firstname = ?1| |Between|findByStartDateBetween| where x.startDate between ?1 and ?2| |LessThan|findByAgeLessThan| where x.age < ?1| |LessThanEqual|findByAgeLessThanEqual| where x.age <= ?1| |GreaterThan|findByAgeGreaterThan| where x.age > ?1| |GreaterThanEqual|findByAgeGreaterThanEqual| where x.age >= ?1| |After|findByStartDateAfter| where x.startDate > ?1| |Before|findByStartDateBefore| where x.startDate < ?1| |IsNull|findByAgeIsNull| where x.age is null| |IsNotNull,NotNull|findByAge(Is)NotNull| where x.age not null| |Like|findByFirstnameLike| where x.firstname like ?1| |NotLike|findByFirstnameNotLike| where x.firstname not like ?1| |StartingWith|findByFirstnameStartingWith| where x.firstname like ?1 (parameter bound with appended %)| |EndingWith|findByFirstnameEndingWith| where x.firstname like ?1 (parameter bound with prepended %)| |Containing|findByFirstnameContaining| where x.firstname like ?1 (parameter bound wrapped in %)| |OrderBy|findByAgeOrderByLastnameDesc| where x.age = ?1 order by x.lastname desc| |Not|findByLastnameNot| where x.lastname <> ?1| |In|findByAgeIn(Collection ages)| where x.age in ?1| |NotIn|findByAgeNotIn(Collection age)| where x.age not in ?1| |TRUE|findByActiveTrue()| where x.active = true| |FALSE|findByActiveFalse()| where x.active = false| |IgnoreCase|findByFirstnameIgnoreCase| where UPPER(x.firstame) = UPPER(?1)|

5、复杂查询

在实际的开发中我们需要用到分页、删选、连表等查询的时候就需要特殊的方法或者自定义 SQL。

5.1 分页查询

分页查询在实际使用中非常普遍了，Spring Boot Jpa 已经帮我们实现了分页的功能，在查询的方法中，需要传入 参数Pageable ，当查询中有多个参数的时候Pageable建议做为最后一个参数传入。

Page<Student> findALL(Pageable pageable);
Page<Student> findByName(String name,Pageable pageable);

Pageable 是 Spring 封装的分页实现类，使用的时候需要传入页数、每页条数和排序规则。

@Test
public void testPageQuery() throws Exception {
    int page=1,size=10;
    Sort sort = new Sort(Direction.DESC, "id");
    Pageable pageable = new PageRequest(page, size, sort);
    studentDao.findALL(pageable);
    studentDao.findByName("tom", pageable);
}

5.2 限制查询

有时候我们只需要查询前N个元素，或者只取前一个实体。

Student findFirstByOrderByNameAsc();
Student findTopByOrderByAgeDesc();
Page<Student> queryFirst10ByName(String name, Pageable pageable);
List<Student> findFirst10ByName(String name, Sort sort);
List<Student> findTop10ByName(String name, Pageable pageable);

5.3 自定义SQL查询

其实 Spring Data 觉大部分的 SQL 都可以根据方法名定义的方式来实现，但是由于某些原因我们想使用自定义的 SQL 来查询，Spring Data 也是完美支持的在 SQL 的查询方法上面使用@Query注解，如涉及到删除和修改再需 要加上@Modifying，也可以根据需要添加 @Transactional对事物的支持，查询超时的设置等。

@Modifying
@Query("update student stu set stu.name = ?1 where stu.id = ?2")
int modifyNameById(String name, Long id);
    
@Transactional
@Modifying
@Query("delete from student where id = ?1")
void deleteById(Long id);
@Transactional(timeout = 10)
@Query("select stu from student stu where stu.id = ?1")
User findById(Long id);

5.4 多表查询

多表查询 Spring Boot Jpa 中有两种实现方式，第一种是利用 Hibernate 的级联查询来实现，第二种是创建一个结 果集的接口来接收连表查询后的结果，这里主要第二种方式。 首先需要定义一个结果集的接口类

public interface HotelSummary {
    City getCity();
    String getName();
    Double getAverageRating();
    default Integer getAverageRatingRounded() {
        return getAverageRating() == null ? null : (int) Math.round(getAverageRating());
    }
}

查询的方法返回类型设置为新创建的接口

@Query("select h.city as city, h.name as name, avg(r.rating) as averageRating "
        - "from Hotel h left outer join h.reviews r where h.city = ?1 group by h")
Page<HotelSummary> findByCity(City city, Pageable pageable);
@Query("select h.name as name, avg(r.rating) as averageRating "
        - "from Hotel h left outer join h.reviews r  group by h")
Page<HotelSummary> findByCity(Pageable pageable);

使用

Page<HotelSummary> hotels = this.hotelRepository.findByCity(new PageRequest(0, 10, Direction.ASC, "name"));
for(HotelSummary summay:hotels){
        System.out.println("Name" +summay.getName());
    }

在运行中 Spring 会给接口HotelSummary自动生产一个代理类来接收返回的结果，代码汇总使用 getXX 的形式来获取。

6、使用枚举

使用枚举的时候，我们希望数据库中存储的是枚举对应的 String 类型，而不是枚举的索引值，需要在属性上面添 加@Enumerated(EnumType.STRING) 注解

@Enumerated(EnumType.STRING) 
@Column(nullable = true)
private UserType type;

7、不需要和数据库映射的属性

正常情况下我们在实体类上加入注解@Entity，就会让实体类和表相关连如果其中某个属性我们不需要和数据库 来关联只是在展示的时候做计算，只需要加上@Transient属性既可。

@Transient
private String userName;

8、多数据源的支持

8.1 同源数据库的多源支持

日常项目中因为使用的分布式开发模式，不同的服务有不同的数据源，常常需要在一个项目中使用多个数据源，因 此需要配置 Spring Boot Jpa 对多数据源的使用，一般分一下为三步 - 1 配置多数据源 - 2 不同源的实体类放入不同包路径 - 3 声明不同的包路径下使用不同的数据源、事务支持

8.2 异构数据库多源支持

比如我们的项目中，即需要对 mysql 的支持，也需要对 Mongodb 的查询等。 实体类声明@Entity 关系型数据库支持类型，声明@Document 为 Mongodb 支持类型，不同的数据源使用不同的 实体就可以了。

interface PersonRepository extends Repository<Person, Long> {
 
}
@Entity
public class Person {
  
}
interface UserRepository extends Repository<User, Long> {
 
}
@Document
public class User {
  
}

但是，如果 User 用户既使用 Mysql 也使用 Mongodb 呢，也可以做混合使用。

interface JpaPersonRepository extends Repository<Person, Long> {
 
}
interface MongoDBPersonRepository extends Repository<Person, Long> {
 
}
@Entity
@Document
public class Person {
  
}

也可以通过对不同的包路径进行声明，比如 A 包路径下使用 mysql，B 包路径下使用 MongoDB。

@EnableJpaRepositories(basePackages = "com.neo.repositories.jpa")
@EnableMongoRepositories(basePackages = "com.neo.repositories.mongo")
interface Configuration { }

9、多数据源使用案例

9.1 导入pom依赖

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.4</version>
        <relativePath/>
    </parent>
    <groupId>com.example</groupId>
    <artifactId>spring-boot-multi-jpa</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-boot-multi-jpa</name>
    <description>spring-boot-multi-Jpa</description>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!-- lombok 依赖-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

9.2 配置文件

spring.datasource.primary.jdbc-url=jdbc:mysql://localhost:3306/test1?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true
spring.datasource.primary.username=root
spring.datasource.primary.password=root
spring.datasource.primary.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.secondary.jdbc-url=jdbc:mysql://localhost:3306/test2?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true
spring.datasource.secondary.username=root
spring.datasource.secondary.password=root
spring.datasource.secondary.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.hbm2ddl.auto=create
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.properties.hibernate.format_sql=true

9.3 实体类

package com.example.springbootmultijpa.model;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import javax.persistence.*;
import java.io.Serializable;
@Getter
@Setter
@Entity
@NoArgsConstructor
@AllArgsConstructor
public class User implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private long id;
    @Column(nullable = false, unique = true)
    private String userName;
    @Column(nullable = false)
    private String passWord;
    @Column(nullable = false, unique = true)
    private String email;
    @Column(nullable = true, unique = true)
    private String nickName;
    @Column(nullable = false)
    private String regTime;
    public User(String userName, String passWord, String email, String nickName, String regTime) {
        this.userName = userName;
        this.passWord = passWord;
        this.email = email;
        this.nickName = nickName;
        this.regTime = regTime;
    }
}

9.4 config

package com.example.springbootmultijpa.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateProperties;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateSettings;
import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import javax.sql.DataSource;
import java.util.Map;
@Configuration
public class DataSourceConfig {
    @Autowired
    private JpaProperties jpaProperties;
    @Autowired
    private HibernateProperties hibernateProperties;
    @Bean(name = "primaryDataSource")
    @Primary
    @ConfigurationProperties("spring.datasource.primary")
    public DataSource firstDataSource() {
        return DataSourceBuilder.create().build();
    }
    @Bean(name = "secondaryDataSource")
    @ConfigurationProperties("spring.datasource.secondary")
    public DataSource secondDataSource() {
        return DataSourceBuilder.create().build();
    }
    @Bean(name = "vendorProperties")
    public Map<String, Object> getVendorProperties() {
        return hibernateProperties.determineHibernateProperties(jpaProperties.getProperties(),
                new HibernateSettings());
    }
}

package com.example.springbootmultijpa.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import javax.persistence.EntityManager;
import javax.sql.DataSource;
import java.util.Map;
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef = "entityManagerFactoryPrimary",
        transactionManagerRef = "transactionManagerPrimary",
        basePackages = {"com.example.springbootmultijpa.repository.test1"})//设置daorepo所在位置
public class PrimaryConfig {
    @Autowired
    @Qualifier("primaryDataSource")
    private DataSource primaryDataSource;
    @Autowired
    @Qualifier("vendorProperties")
    private Map<String, Object> vendorProperties;
    @Bean(name = "entityManagerFactoryPrimary")
    @Primary
    public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary(EntityManagerFactoryBuilder builder) {
        return builder
                .dataSource(primaryDataSource)
                .properties(vendorProperties)
                .packages("com.example.springbootmultijpa.model") //设置实体类所在位置
                .persistenceUnit("primaryPersistenceUnit")
                .build();
    }
    @Bean(name = "entityManagerPrimary")
    @Primary
    public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
        return entityManagerFactoryPrimary(builder).getObject().createEntityManager();
    }
    @Bean(name = "transactionManagerPrimary")
    @Primary
    PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
        return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
    }
}

package com.example.springbootmultijpa.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import javax.persistence.EntityManager;
import javax.sql.DataSource;
import java.util.Map;
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef = "entityManagerFactorySecondary",
        transactionManagerRef = "transactionManagerSecondary",
        basePackages = {"com.example.springbootmultijpa.repository.test2"})
public class SecondaryConfig {
    @Autowired
    @Qualifier("secondaryDataSource")
    private DataSource secondaryDataSource;
    @Autowired
    @Qualifier("vendorProperties")
    private Map<String, Object> vendorProperties;
    @Bean(name = "entityManagerFactorySecondary")
    public LocalContainerEntityManagerFactoryBean entityManagerFactorySecondary(EntityManagerFactoryBuilder builder) {
        return builder
                .dataSource(secondaryDataSource)
                .properties(vendorProperties)
                .packages("com.example.springbootmultijpa.model")
                .persistenceUnit("secondaryPersistenceUnit")
                .build();
    }
    @Bean(name = "entityManagerSecondary")
    public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
        return entityManagerFactorySecondary(builder).getObject().createEntityManager();
    }
    @Bean(name = "transactionManagerSecondary")
    PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) {
        return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());
    }
}

9.5 Repository

package com.example.springbootmultijpa.repository.test1;
import com.example.springbootmultijpa.model.User;
import org.springframework.data.jpa.repository.JpaRepository;
public interface UserTest1Repository extends JpaRepository<User, Long> {
    User findById(long id);
    User findByUserName(String userName);
    User findByUserNameOrEmail(String username, String email);
}

package com.example.springbootmultijpa.repository.test2;
import com.example.springbootmultijpa.model.User;
import org.springframework.data.jpa.repository.JpaRepository;
public interface UserTest2Repository extends JpaRepository<User, Long> {
    User findById(long id);
    User findByUserName(String userName);
    User findByUserNameOrEmail(String username, String email);
}

9.6 启动类

package com.example.springbootmultijpa;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SpringBootMultiJpaApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringBootMultiJpaApplication.class, args);
    }
}

9.7 测试

package com.example.springbootmultijpa.repository;
import com.example.springbootmultijpa.model.User;
import com.example.springbootmultijpa.repository.test1.UserTest1Repository;
import com.example.springbootmultijpa.repository.test2.UserTest2Repository;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import javax.annotation.Resource;
import java.text.DateFormat;
import java.util.Date;
@RunWith(SpringRunner.class)
@SpringBootTest
public class UserRepositoryTests {
    @Resource
    private UserTest1Repository userTest1Repository;
    @Resource
    private UserTest2Repository userTest2Repository;
    @Test
    public void testSave() throws Exception {
        Date date = new Date();
        DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG);
        String formattedDate = dateFormat.format(date);
        userTest1Repository.save(new User("aa", "aa123456", "aa@126.com", "aa", formattedDate));
        userTest1Repository.save(new User("bb", "bb123456", "bb@126.com", "bb", formattedDate));
        userTest2Repository.save(new User("cc", "cc123456", "cc@126.com", "cc", formattedDate));
    }
    @Test
    public void testDelete() throws Exception {
        userTest1Repository.deleteAll();
        userTest2Repository.deleteAll();
    }
    @Test
    public void testBaseQuery() {
        Date date = new Date();
        DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG);
        String formattedDate = dateFormat.format(date);
        User user = new User("ff", "ff123456", "ff@126.com", "ff", formattedDate);
        userTest1Repository.findAll();
        userTest2Repository.findById(3l);
        userTest2Repository.save(user);
        user.setId(2l);
        userTest1Repository.delete(user);
        userTest1Repository.count();
        userTest2Repository.findById(3l);
    }
}

运行testSave()得到的结果 img 运行testBaseQuery()得到的结果 img 运行testDelete()得到的结果 img

标签:
spring boot

推荐阅读

♦ 基于HTML5的个人网页的网站设计与实现 毕业设计-附源码031623
(0)
♦ SpringBoot（接受参数相关注解）
(0)
♦ 【SpringCloud】探索Eureka注册中心
(0)

每日一言

""付出就会有回报，比如一倍的奢望，换两倍的失望。""

最近发布

热门标签

json(1) linux(1) python(1) shell(1) SublimeText(1) zsh(1) 分布式(1) 快捷键(1) 运维(1) 问题排查(1) 限流(1) mac(2) mysql(2)
...

站点统计

本周更新文章: 0 篇
文章总数: 59110 篇
今日访问量: 53143 次
访问总量: 147300 次