springboot+hibernate(jpa)配置多数据源_spring boot hibernate配置多数据源

 个人在配置完spring boot多数据源后报错！仔细看了报错的信息提示创建从数据源bean失败，最后还是因为自己不仔细造成的，从数据库少创建一张表。废话不说直接贴代码！
pom.xml 文件就不上了，正常的依赖包。
application.properties 配置信息：

#主数据源
spring.datasource.primary.url=jdbc:mysql://localhost:3306/test1?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC&useSSL=true
spring.datasource.primary.username=root
spring.datasource.primary.password=root
spring.datasource.primary.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.max-active=10
spring.datasource.primary.max-idle=5
spring.datasource.primary.min-idle=0
#从数据源
spring.datasource.secondary.url=jdbc:mysql://localhost:3306/test2?characterEncoding=utf-8&serverTimezone=UTC&useSSL=true
spring.datasource.secondary.username=root
spring.datasource.secondary.password=root
spring.datasource.secondary.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.secondary.max-active=10
spring.datasource.secondary.max-idle=5
spring.datasource.secondary.min-idle=0
 
#Spring Data JPA
spring.jpa.database=MYSQL
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update
# Naming strategy
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
# stripped before adding them to the entity manager)
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

 连接数据库字段做了一些更改，变了之后springboot就不认识这东西，不知道它是数据库的信息配置，因此我们需要重新定义。 
首先，定义数据源，并且注明一个主数据源，一个从数据源。直接在java目录下，直接在启动类同级新建一个DataSourceConfig.java文件。

import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
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;
 
/**
 * @ClassName DataSourcesConfig
 * @Description TODO
 * @Author duyuanyuan
 * @Date 2019/1/311:05
 * @Version 1.0
 **/
@Configuration
public class DataSourcesConfig {
    //配置主数据源@Primary表示主数据源
    @Bean(name = "primaryDataSource")
    @Qualifier("primaryDataSource")
    @Primary
    @ConfigurationProperties(prefix="spring.datasource.primary")//此处要与配置连接数据库信息一致
    public DataSource primaryDataSource() {
        System.out.println("primary db built");
        return DataSourceBuilder.create().build();
    }
    //配置从数据源
    @Bean(name = "secondaryDataSource")
    @Qualifier("secondaryDataSource")
    @ConfigurationProperties(prefix="spring.datasource.secondary")//此处要与配置连接数据库信息一致
    public DataSource secondaryDataSource() {
        System.out.println("secondary db built");
        return DataSourceBuilder.create().build();
    }
}

 这样就相当于告诉程序，程序要用到两个数据库，于是程序就去连接这两个数据库。怎么连接呢，默认的连接已经行不通了，因此，对于每个数据库还需要有一个定义文件告诉程序如何去连接它。 
同样，我们在启动类同级目录新建两个数据库定义文件PrimaryConfig.java与SecondaryConfig.java，分别定义主数据库与从数据库。新建从数据源配置类SecondaryConfig.java

 
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
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;
 
/**
 * @ClassName SecondaryConfig
 * @Description TODO
 * @Author duyuanyuan
 * @Date 2019/1/311:10
 * @Version 1.0
 **/
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef="entityManagerFactorySecondary",
        transactionManagerRef="transactionManagerSecondary",
        basePackages= { "com.aaa.Repository.secondary" }) //设置Repository所在位置
public class SecondaryConfig {
 
    @Autowired
    private JpaProperties jpaProperties;
 
    @Autowired @Qualifier("secondaryDataSource")
    private DataSource secondaryDataSource;
 
    @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)
                .properties(getVendorProperties(secondaryDataSource))
                .packages("com.aaa.Entity") //设置实体类所在位置
                .persistenceUnit("secondaryPersistenceUnit")
                .build();
    }
 
 
    private Map<String, String> getVendorProperties(DataSource dataSource) {
        return jpaProperties.getHibernateProperties(dataSource);
    }
 
    @Bean(name = "transactionManagerSecondary")
    PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) {
        return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());
    }
 
}

建主数据源配置类PrimaryConfig.java

 
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
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;
 
/**
 * @ClassName PrimaryConfig
 * @Description TODO
 * @Author duyuanyuan
 * @Date 2019/1/311:07
 * @Version 1.0
 **/
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef="entityManagerFactoryPrimary",
        transactionManagerRef="transactionManagerPrimary",
        basePackages= { "com.aaa.Repository" }) //设置Repository所在位置
public class PrimaryConfig {
 
    @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(primaryDataSource))
                .packages("com.aaa.Entity") //设置实体类所在位置
                .persistenceUnit("primaryPersistenceUnit")
                .build();
    }
 
    @Autowired(required=false)
    private JpaProperties jpaProperties;
 
    private Map<String, String> getVendorProperties(DataSource dataSource) {
        return jpaProperties.getHibernateProperties(dataSource);
    }
 
    @Primary
    @Bean(name = "transactionManagerPrimary")
    public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
        return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
    }
 
}

到这里spring boot jpa多数据源已经配置完成，正常写Controller Service  Repository，根据业务需求可以在Service实现类注入不同数据源下的Repository即可。