Introduction
JPA (Java Persistence API) Java Persistence the API, the Java persistence standards, Hibernate is a persistence specification technology, and Spring Data JPA Hibernate is encapsulated in a frame basis.
Spring JPA for the first time, I felt that something is simply an artifact, almost do not need to write about what code database access CURD a basic function came out. In this article, we will introduce methods to integrate Spring Boot JPA uses multiple data sources.
Development Environment:
- Spring Boot 2.0.5
- Spring Data JPA 2.0.5
- MySQL 5.6
- JDK 8
- IDEA 2018.3
- Windows 10
The introduction of dependence
First, we want to introduce Spring Boot spring-boot-starter-data-jpadependent.
Maven configuration:
<dependency>
<groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency>Gradle configuration:
compile group: 'org.springframework.boot', name: 'spring-boot-starter-data-jpa', version: '2.0.5.RELEASE'
compile group: 'org.springframework.boot', name: 'spring-boot-starter-web', version: '2.0.5.RELEASE' compile group: 'org.springframework.boot', name: 'spring-boot-devtools', version: '2.0.5.RELEASE' compile group: 'mysql', name: 'mysql-connector-java', version: '6.0.6'Configuration data source
Spring Boot provides methods of using application.properties or application.yml file configuration item attributes. I am more accustomed to using application.yml file, so I will just list the wording application.yml file.
spring:
datasource:
product:
driver-class-name: com.mysql.jdbc.Driver
jdbc-url: jdbc:mysql://127.0.0.1:3306/product?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC&autoReconnect=true&useSSL=false&zeroDateTimeBehavior=convertToNull
username: root
password: test123$
customer:
driver-class-name: com.mysql.jdbc.Driver
jdbc-url: jdbc:mysql://127.0.0.1:3306/customer?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC&autoReconnect=true&useSSL=false&zeroDateTimeBehavior=convertToNull username: root password: test123$ jpa: generate-ddl: trueAfter configuring application.yml files are created in the customer and product databases database.
Add Entity (Entity) class
Customer entity:
package com.springboot.jpa.customer.models;
import javax.persistence.*;
@Entity
public class Customer { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Integer id; @Column(unique = true, nullable = false) private String email; private String firstName; private String lastName; protected Customer() { } public Customer(String email, String firstName, String lastName) { this.email = email; this.firstName = firstName; this.lastName = lastName; } @Override public String toString() { return String.format("Customer[id=%d, firstName='%s', lastName='%s',email='%s']", id, firstName, lastName, email); } public Integer getId() { return id; } public String getEmail() { return email; } public String getFirstName() { return firstName; } public String getLastName() { return lastName; } }Product Entity:
package com.springboot.jpa.product.models;
import javax.persistence.*;
@Entity
public class Product { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private int id; @Column(nullable = false) private String code; private String name; private double price; protected Product() { } public Product(String code, String name, double price) { this.code = code; this.name = name; this.price = price; } @Override public String toString() { return String.format("Product[id=%d, code='%s', name='%s', price='%s']", id, code, name, price); } public int getId() { return id; } public String getCode() { return code; } public String getName() { return name; } public double getPrice() { return price; } } Adding data warehouse (Repository) class
Customer Repository:
package com.springboot.jpa.customer.repository;
import com.springboot.jpa.customer.models.Customer;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
@Repository public interface CustomerRepository extends JpaRepository<Customer, Integer> { }Product Repository:
package com.springboot.jpa.product.repository;
import com.springboot.jpa.product.models.Product;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
@Repository public interface ProductRepository extends JpaRepository<Product, Integer> { }Add Configuration (Config) class
Client Configuration:
package com.springboot.jpa.customer.config;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
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.EntityManagerFactory; import javax.sql.DataSource; @Configuration @EnableTransactionManagement @EnableJpaRepositories(entityManagerFactoryRef = "customerEntityManagerFactory", transactionManagerRef = "customerTransactionManager", basePackages = {"com.springboot.jpa.customer.repository"}) public class CustomerConfig { @Primary @Bean(name = "customerDataSource") @ConfigurationProperties(prefix = "spring.datasource.customer") public DataSource customerDataSource() { return DataSourceBuilder.create().build(); } @Primary @Bean(name = "customerEntityManagerFactory") public LocalContainerEntityManagerFactoryBean entityManagerFactory(EntityManagerFactoryBuilder builder, @Qualifier("customerDataSource") DataSource dataSource) { return builder.dataSource(dataSource).packages("com.springboot.jpa.customer.data").persistenceUnit("customer").build(); } @Primary @Bean(name = "customerTransactionManager") public PlatformTransactionManager customerTransactionManager(@Qualifier("customerEntityManagerFactory") EntityManagerFactory customerEntityManagerFactory) { return new JpaTransactionManager(customerEntityManagerFactory); } }Product Configuration:
package com.springboot.jpa.product.config;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
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.EntityManagerFactory; import javax.sql.DataSource; @Configuration @EnableTransactionManagement @EnableJpaRepositories(entityManagerFactoryRef = "productEntityManagerFactory", transactionManagerRef = "productTransactionManager", basePackages = {"com.springboot.jpa.product.repository"} ) public class ProductConfig { @Bean(name = "productDataSource") @ConfigurationProperties(prefix = "spring.datasource.product") public DataSource dataSource() { return DataSourceBuilder.create().build(); } @Bean(name = "productEntityManagerFactory") public LocalContainerEntityManagerFactoryBean barEntityManagerFactory(EntityManagerFactoryBuilder builder, @Qualifier("productDataSource") DataSource dataSource) { return builder.dataSource(dataSource).packages("com.springboot.jpa.product.data").persistenceUnit("product").build(); } @Bean(name = "productTransactionManager") public PlatformTransactionManager productTransactionManager(@Qualifier("productEntityManagerFactory") EntityManagerFactory productEntityManagerFactory) { return new JpaTransactionManager(productEntityManagerFactory); } }Project structure:
src/main/java
- com.springboot.jpa
- product
- config
- models
- repository
- customer
- config
- models
- repositoryAdd the test class
Customer test class CustomerDataSourcesTests:
package com.springboot.jpa;
import com.springboot.jpa.customer.repository.CustomerRepository;
import com.springboot.jpa.customer.models.Customer;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; import org.springframework.transaction.annotation.Transactional; import org.junit.Test; import static org.junit.Assert.assertEquals; import static org.junit.Assert.assertNotNull; @RunWith(SpringRunner.class) @SpringBootTest public class CustomerDataSourcesTests { @Autowired private CustomerRepository customerRepository; @Test @Transactional("customerTransactionManager") public void createCustomer() { Customer customer = new Customer("[email protected]", "Charles", "Zhang"); customer = customerRepository.save(customer); assertNotNull(customerRepository.findById(customer.getId())); assertEquals(customerRepository.findById(customer.getId()).get().getEmail(), "[email protected]"); } }Product testing categories ProductDataSourcesTests:
package com.springboot.jpa;
import com.springboot.jpa.product.models.Product;
import com.springboot.jpa.product.repository.ProductRepository;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; import org.springframework.transaction.annotation.Transactional; import org.junit.Test; import static org.junit.Assert.assertNotNull; @RunWith(SpringRunner.class) @SpringBootTest public class ProductDataSourcesTests { @Autowired private ProductRepository productRepository; @Test @Transactional("productTransactionManager") public void createProduct() { Product product = new Product("10000", "Book", 80.0); product = productRepository.save(product); assertNotNull(productRepository.findById(product.getId())); } }test
After each test run two classes by querying the database.
Customer table:
mysql> SELECT * FROM customer;
+----+-------------------+-----------+----------+
| id | email | firstName | lastName |
+----+-------------------+-----------+----------+
| 1 | [email protected] | Charles | Zhang |
+----+-------------------+-----------+----------+
1 row in setProduct Table:
mysql> SELECT * FROM product;
+----+-------+------+-------+
| id | code | name | price |
+----+-------+------+-------+
| 1 | 10000 | Book | 80 |
+----+-------+------+-------+
1 row in setThis article addresses: the Spring JPA the Boot integration using a plurality of data sources
LOCATION: Spring-Boot-JPA
Author: Charles Zhang
Source: https://www.cnblogs.com/weisenz/
This site uses " Attribution 4.0 international " Creative Commons agreement, reproduced in the article clearly indicate the position of the author and source.
Classification of
the Java
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the Spring the Boot