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JPA多数据源

MrJason...大约 3 分钟

JPA多数据源

1. 集成步骤

  1. 引入相关maven依赖

    		<!--spring data jpa -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>

		<!-- lombok -->
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</dependency>

		<!-- 阿里的数据源-->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.1.10</version>
		</dependency>

		<!-- mysql -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>

    1. 配置数据库和jpa一些简易配置

      spring:
  datasource:
    primary:
      driver-class-name: com.mysql.jdbc.Driver
      url: jdbc:mysql://localhost:3306/primary?useUnicode=true&characterEncoding=UTF-8&useOldAliasMetadataBehavior=true&serverTimezone=Asia/Shanghai
      username: root
      password: root
      # create, create-drop, update, validate
      # 作用主要用于：自动创建、更新、验证数据库表结构
      ddl-auto: create
    second:
      driver-class-name: com.mysql.jdbc.Driver
      url: jdbc:mysql://localhost:3306/second?useUnicode=true&characterEncoding=UTF-8&useOldAliasMetadataBehavior=true&serverTimezone=Asia/Shanghai
      username: root
      password: root
      ddl-auto: create
  jpa:
    show-sql: false
    hibernate:
      format_sql: true
      primary-dialect: org.hibernate.dialect.MySQL55Dialect
      second-dialect: org.hibernate.dialect.MySQL55Dialect

  2. 多数据源配置

    1.1 DataSourceConfig

    package com.zszdevelop.moredb.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Qualifier;
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;

/**
 * @author 作者: zhangshengzhong
 * @文件名: DataSourceConfig
 * @版本号:1.0
 * @创建日期: 2020/12/7 15:50
 * @描述:
 */
@Configuration
public class DataSourceConfig {

    /**
     * 第一个数据连接，默认优先级最高
     *
     * @return
     */
    @Primary
    @Bean(name = "primaryDataSource")
    @Qualifier("primaryDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.primary")
    public DataSource PrimaryDataSource() {
        return DataSourceBuilder.create().type(DruidDataSource.class).build();
    }

    /**
     * 第二个数据源
     *
     * @return
     */
    @Bean(name = "secondDataSource")
    @Qualifier("secondDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.second")
    public DataSource secondaryDataSource() {
        return DataSourceBuilder.create().type(DruidDataSource.class).build();
    }
}

    2.2 PrimaryConfig

    package com.zszdevelop.moredb.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.core.env.Environment;
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.HashMap;
import java.util.Map;

/**
 * @author 作者: zhangshengzhong
 * @文件名: PrimaryConfig
 * @版本号:1.0
 * @创建日期: 2020/12/7 15:55
 * @描述:
 */
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef="entityManagerFactoryPrimary",
        transactionManagerRef="transactionManagerPrimary",
        basePackages= { "com.zszdevelop.moredb.repository.primary" })
public class PrimaryConfig {

    @Autowired
    private Environment env;

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

    @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)
                .properties(getVendorProperties())
                .packages("com.zszdevelop.moredb.domain.primary")
                .persistenceUnit("primaryPersistenceUnit")
                .build();
    }



    private Map<String, String> getVendorProperties() {
        Map<String, String> jpaProperties = new HashMap<>(16);
        jpaProperties.put("hibernate.hbm2ddl.auto", env.getProperty("spring.datasource.primary.ddl-auto"));
        jpaProperties.put("hibernate.show_sql", env.getProperty("spring.jpa.show-sql"));
        jpaProperties.put("hibernate.format_sql", env.getProperty("spring.jpa.hibernate.format_sql"));
        jpaProperties.put("hibernate.dialect", env.getProperty("spring.jpa.hibernate.primary-dialect"));
        jpaProperties.put("hibernate.current_session_context_class", "org.springframework.orm.hibernate5.SpringSessionContext");
        return jpaProperties;
    }

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

    3.3 SecondConfig

    package com.zszdevelop.moredb.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.core.env.Environment;
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.HashMap;
import java.util.Map;

/**
 * @author 作者: zhangshengzhong
 * @文件名: SecondConfig
 * @版本号:1.0
 * @创建日期: 2020/12/7 16:00
 * @描述:
 */
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        //实体管理
        entityManagerFactoryRef="entityManagerFactorySecond",
        //事务管理
        transactionManagerRef="transactionManagerSecond",
        //实体扫描,设置Repository所在位置
        basePackages= { "com.zszdevelop.moredb.repository.second" })
public class SecondConfig {

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

    @Autowired
    private Environment env;

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

    @Bean(name = "entityManagerFactorySecond")
    public LocalContainerEntityManagerFactoryBean entityManagerFactorySecond (EntityManagerFactoryBuilder builder) {
        return builder
                .dataSource(secondDataSource)
                .properties(getVendorProperties())
                .packages("com.zszdevelop.moredb.domain.second")
                .persistenceUnit("secondPersistenceUnit")
                .build();
    }

    private Map<String, String> getVendorProperties() {
        Map<String, String> jpaProperties = new HashMap<>(16);
        jpaProperties.put("hibernate.hbm2ddl.auto",  env.getProperty("spring.datasource.second.ddl-auto"));
        jpaProperties.put("hibernate.show_sql", env.getProperty("spring.jpa.show-sql"));
        jpaProperties.put("hibernate.dialect", env.getProperty("spring.jpa.hibernate.Second-dialect"));
        jpaProperties.put("hibernate.format_sql", env.getProperty("spring.jpa.hibernate.format_sql"));
        jpaProperties.put("hibernate.current_session_context_class", "org.springframework.orm.hibernate5.SpringSessionContext");
        return jpaProperties;
    }

    @Bean(name = "transactionManagerSecond")
    PlatformTransactionManager transactionManagerSecond(EntityManagerFactoryBuilder builder) {
        return new JpaTransactionManager(entityManagerFactorySecond(builder).getObject());
    }
}
    image-20201207161731505
    image-20201207161731505

至此就已经配置完毕了

2. 测试

  1. UserPrimaryEntity

    package com.zszdevelop.moredb.domain.primary;

import lombok.AccessLevel;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.FieldDefaults;

import javax.persistence.*;
import java.io.Serializable;

/**
 * @author 作者: zhangshengzhong
 * @文件名: UserPrimaryEntity
 * @版本号:1.0
 * @创建日期: 2020/12/7 16:05
 * @描述:
 */
@Data
@Entity
@NoArgsConstructor
@Table(name = "t_user")
@FieldDefaults(level = AccessLevel.PRIVATE)
public class UserPrimaryEntity implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    Long id;

    /**
     * 名称
     */
    String name;

    /**
     * 性别
     */
    String sex;
}
    1. UserSecondEntity
    package com.zszdevelop.moredb.domain.second;

import lombok.AccessLevel;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.FieldDefaults;

import javax.persistence.*;
import java.io.Serializable;

/**
 * @author 作者: zhangshengzhong
 * @文件名: UserSecondEntity
 * @版本号:1.0
 * @创建日期: 2020/12/7 16:05
 * @描述:
 */
@Data
@Entity
@NoArgsConstructor
@Table(name = "t_user")
@FieldDefaults(level = AccessLevel.PRIVATE)
public class UserSecondEntity implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    Long id;

    /**
     * 名称
     */
    String name;

    /**
     * 性别
     */
    String sex;
}
    1. UserPrimaryRepository
    
@Repository
public interface UserPrimaryRepository extends JpaRepository<UserPrimaryEntity, Long> {

}
    1. UserSecondRepository
    @Repository
public interface UserSecondRepository extends JpaRepository<UserSecondEntity, Long> {

}
    1. 测试类
    @SpringBootTest
class MoredbApplicationTests {


	@Autowired
	private UserPrimaryRepository userPrimaryRepository;
	@Autowired
	private UserSecondRepository userSecondRepository;

	@Test
	void contextLoads() {
		System.out.println(userPrimaryRepository.findAll());
		System.out.println(userSecondRepository.findAll());
	}

}
    image-20201207162216525
    image-20201207162216525
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