springboot jpa 配置多数据源

jpa 多数据源配置多个 mysql 数据库配置

springboot jpa 配置多数据源其实也并不难，只需要在 properties 或者 yml中简单配置并在项目中引入配置即可。

下面以 yml 为例：

（1）配置2个数据源 one 和 two

spring:datasource:one:url: jdbc:mysql://127.0.0.1:3306/db1?useSSL=true&useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=CTT&zeroDateTimeBehavior=convertToNullusername: rootpassword: roottype: com.alibaba.druid.pool.DruidDataSourcetwo:url: jdbc:mysql://127.0.0.1:3306/db2?useSSL=true&useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=CTT&zeroDateTimeBehavior=convertToNullusername: rootpassword: roottype: com.alibaba.druid.pool.DruidDataSourcejpa:database: mysqlhibernate:ddl-auto: update

（2）创建数据源配置

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;import javax.sql.DataSource;/*** @author Guihong.Zhang* @since 2021-04-08 11:01**/
@Configuration
public class DataSourceConfig {@Bean@Primary@ConfigurationProperties(prefix = "spring.datasource.one")DataSource dsOne(){return DruidDataSourceBuilder.create().build();}@Bean@ConfigurationProperties(prefix = "spring.datasource.two")DataSource dsTwo(){return DruidDataSourceBuilder.create().build();}
}

（3）jpa分别配置2个数据源
@EnableJpaRepositories(basePackages = “repository 包名”)
builder.dataSource(dsOne).packages(“实体类包名”)
分别对应两个数据库，不同的包下的代码会连接不同的数据库，包括自动建表和CRUD。

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 javax.annotation.Resource;
import javax.sql.DataSource;/*** @author Guihong.Zhang* @since 2021-04-08 11:04**/
@Configuration
@EnableJpaRepositories(basePackages = "com.test.repository.one",entityManagerFactoryRef = "localContainerEntityManagerFactoryBean1",transactionManagerRef = "platformTransactionManager1")
public class JpaConfigOne {@Resource@Qualifier("dsOne")DataSource dsOne;@ResourceJpaProperties jpaProperties;@Resourceprivate HibernateProperties properties;@Bean@PrimaryLocalContainerEntityManagerFactoryBean localContainerEntityManagerFactoryBean1(EntityManagerFactoryBuilder builder) {return builder.dataSource(dsOne).properties(jpaProperties.getProperties()).persistenceUnit("pu1").packages("com.test.entity.one").properties(properties.determineHibernateProperties(jpaProperties.getProperties(), newHibernateSettings())).build();}@BeanPlatformTransactionManager platformTransactionManager1(EntityManagerFactoryBuilder builder) {return new JpaTransactionManager(localContainerEntityManagerFactoryBean1(builder).getObject());}
}

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 javax.annotation.Resource;
import javax.sql.DataSource;/*** @author Guihong.Zhang* @since 2021-04-08 11:09**/
@Configuration
@EnableJpaRepositories(basePackages = "com.test.repository.two",entityManagerFactoryRef = "localContainerEntityManagerFactoryBean2",transactionManagerRef = "platformTransactionManager2")
public class JpaConfigTwo {@Resource@Qualifier("dsTwo")DataSource dsTwo;@ResourceJpaProperties jpaProperties;@Resourceprivate HibernateProperties properties;@BeanLocalContainerEntityManagerFactoryBean localContainerEntityManagerFactoryBean2(EntityManagerFactoryBuilder builder) {return builder.dataSource(dsTwo).properties(jpaProperties.getProperties()).persistenceUnit("pu2").packages("com.test.entity.two").properties(properties.determineHibernateProperties(jpaProperties.getProperties(), newHibernateSettings())).build();}@BeanPlatformTransactionManager platformTransactionManager2(EntityManagerFactoryBuilder builder) {return new JpaTransactionManager(localContainerEntityManagerFactoryBean2(builder).getObject());}
}

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