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Springboot JPA 多数据源案例

来源：SegmentFault 2023-02-18 16:49:27 0浏览收藏

小伙伴们有没有觉得学习数据库很有意思？有意思就对了！今天就给大家带来《Springboot JPA 多数据源案例》，以下内容将会涉及到MySQL、Java、springboot、后端，若是在学习中对其中部分知识点有疑问，或许看了本文就能帮到你！

maven pom依赖

<dependencies><dependency><groupid>mysql</groupid><artifactid>mysql-connector-java</artifactid><scope>runtime</scope><version>5.1.48</version></dependency><dependency><groupid>com.alibaba</groupid><artifactid>druid-spring-boot-starter</artifactid><version>1.2.4</version></dependency><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-starter-test</artifactid><scope>test</scope></dependency><dependency><groupid>org.projectlombok</groupid><artifactid>lombok</artifactid><version>1.16.10</version><scope>provided</scope></dependency><dependency><groupid>junit</groupid><artifactid>junit</artifactid><scope>test</scope></dependency><dependency><groupid>org.junit.platform</groupid><artifactid>junit-platform-launcher</artifactid><scope>test</scope></dependency><dependency><groupid>org.junit.vintage</groupid><artifactid>junit-vintage-engine</artifactid><version>5.7.0</version><scope>test</scope></dependency></dependencies><build><plugins><plugin><groupid>org.springframework.boot</groupid><artifactid>spring-boot-maven-plugin</artifactid></plugin></plugins></build>

定义配置项

application.yml

spring:
  datasource:
    driverClassName: com.mysql.cj.jdbc.Driver
    # 使用 alibaba druid 连接池、监控
    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      primary :
        jdbc-url: jdbc:mysql://localhost:3306/eladmin
        username: root
        password: 123456
      secondary :
        jdbc-url: jdbc:mysql://localhost:3306/mydb
        username: root
        password: 123456
      # 初始连接数
      initial-size: 5
      # 最小连接数
      min-idle: 10
      # 最大连接数
      max-active: 20
      # 获取连接超时时间
      max-wait: 5000
      # 连接有效性检测时间
      time-between-eviction-runs-millis: 60000
      # 连接在池中最小生存的时间
      min-evictable-idle-time-millis: 300000
      # 连接在池中最大生存的时间
      max-evictable-idle-time-millis: 900000
      test-while-idle: true
      test-on-borrow: false
      test-on-return: false
      # 检测连接是否有效
      validation-query: select 1
      # 配置监控统计
      webStatFilter:
        enabled: true
      stat-view-servlet:
        enabled: true
        url-pattern: /druid/*
        reset-enable: false
      filter:
        stat:
          enabled: true
          # 记录慢SQL
          log-slow-sql: true
          slow-sql-millis: 1000
          merge-sql: true
        wall:
          config:
            multi-statement-allow: true
  jpa:
    hibernate:
      ddlAuto: update
    databasePlatform: org.hibernate.dialect.MySQL5InnoDBDialect
    showSql: true

DataSourceConfig

package com.example.config;

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;

@Configuration
public class DataSourceConfig {

    @Primary
    @Bean
    @ConfigurationProperties(prefix = "spring.datasource.druid.primary")
    public DataSource primaryDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean
    @ConfigurationProperties(prefix = "spring.datasource.druid.secondary")
    public DataSource secondaryDataSource() {
        return DataSourceBuilder.create().build();
    }

}

PrimaryConfig

package com.example.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
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.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.primary.repository" }) //设置Repository所在位置
public class PrimaryConfig {

    @Autowired
    @Qualifier("primaryDataSource")
    private DataSource primaryDataSource;

    @Autowired
    private JpaProperties jpaProperties;
    @Autowired
    private HibernateProperties hibernateProperties;

    private Map<string object> getVendorProperties() {
        return hibernateProperties.determineHibernateProperties(jpaProperties.getProperties(), new HibernateSettings());
    }

    @Primary
    @Bean(name = "entityManagerPrimary")
    public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
        return entityManagerFactoryPrimary(builder).getObject().createEntityManager();
    }

    @Primary
    @Bean(name = "entityManagerFactoryPrimary")
    public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary (EntityManagerFactoryBuilder builder) {

        return builder
                .dataSource(primaryDataSource)
                .packages("com.example.primary.entity") //设置实体类所在位置
                .persistenceUnit("primaryPersistenceUnit")
                .properties(getVendorProperties())
                .build();
    }

    @Primary
    @Bean(name = "transactionManagerPrimary")
    public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
        return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
    }


}</string>

SecondaryConfig

package com.example.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
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.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.slave.repository" }) //设置Repository所在位置
public class SecondaryConfig {

    @Autowired
    @Qualifier("secondaryDataSource")
    private DataSource secondaryDataSource;

    @Autowired
    private JpaProperties jpaProperties;
    @Autowired
    private HibernateProperties hibernateProperties;

    private Map<string object> getVendorProperties() {
        return hibernateProperties.determineHibernateProperties(jpaProperties.getProperties(), new HibernateSettings());
    }

    @Bean(name = "entityManagerSecondary")
    public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
        return entityManagerFactorySecondary(builder).getObject().createEntityManager();
    }

    @Bean(name = "entityManagerFactorySecondary")
    public LocalContainerEntityManagerFactoryBean entityManagerFactorySecondary (EntityManagerFactoryBuilder builder) {
        return builder
                .dataSource(secondaryDataSource)
                .packages("com.example.slave.entity") //设置实体类所在位置
                .persistenceUnit("secondaryPersistenceUnit")
                .properties(getVendorProperties())
                .build();
    }

    @Bean(name = "transactionManagerSecondary")
    PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) {
        return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());
    }

}</string>

User

package com.example.primary.entity;

import lombok.Data;
import lombok.NoArgsConstructor;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
@Data
@NoArgsConstructor
public class User {

    @Id
    @GeneratedValue
    private Long id;

    private String name;
    private Integer age;

    public User(String name, Integer age) {
        this.name = name;
        this.age = age;
    }
}

UserRepository

package com.example.primary.repository;

import com.example.primary.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;

/**
 * Blog: https://blog.didispace.com/
 * Github: https://github.com/dyc87112/
 */
public interface UserRepository extends JpaRepository<user long> {

    @Override
    List<user> findAll();
}
</user></user>

Message

package com.example.slave.entity;

import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
@Data
@NoArgsConstructor
public class Message {

    @Id
    @GeneratedValue
    private Long id;

    private String title;
    private String message;

    public Message(String title, String message) {
        this.title = title;
        this.message = message;
    }

}

MessageRepository

package com.example.slave.repository;

import com.example.slave.entity.Message;
import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;

/**
 * Blog: https://blog.didispace.com/
 * Github: https://github.com/dyc87112/
 */
public interface MessageRepository extends JpaRepository<message long> {


    @Override
    List<message> findAll();
}</message></message>

测试

package com.example;

import com.example.primary.entity.User;
import com.example.primary.repository.UserRepository;
import com.example.slave.entity.Message;
import com.example.slave.repository.MessageRepository;
import lombok.extern.slf4j.Slf4j;
import org.junit.Test;
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 java.util.List;

@Slf4j
@RunWith(SpringRunner.class)
@SpringBootTest
public class JpaApplicationTests {

    @Autowired
    private UserRepository userRepository;
    @Autowired
    private MessageRepository messageRepository;

    @Test
    public void test() throws Exception {
        userRepository.save(new User("aaa", 10));
        userRepository.save(new User("bbb", 20));
        userRepository.save(new User("ccc", 30));
        userRepository.save(new User("ddd", 40));
        userRepository.save(new User("eee", 50));

        List<user> all = userRepository.findAll();

        for (User user: all) {
            System.out.println(user.toString());
        }

        Assert.assertEquals(5, userRepository.findAll().size());

        messageRepository.save(new Message("o1", "aaaaaaaaaa"));
        messageRepository.save(new Message("o2", "bbbbbbbbbb"));
        messageRepository.save(new Message("o3", "cccccccccc"));

        Assert.assertEquals(3, messageRepository.findAll().size());
        List<message> all1 = messageRepository.findAll();

        for (Message msg: all1) {

            System.out.println(msg.toString());
        }
    }

}
</message></user>

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