spring data jpa 多数据源

由于业务需要把原来项目的单数据源变成了两个数据源，方式和mybatis的差不多但是还是要在这里记录一下，顺便记录一下花了一个多小时解决的坑。首先看一下配置文件：

spring.datasource.primary.url=ip1
spring.datasource.primary.username=username1
spring.datasource.primary.password=password1
spring.datasource.primary.driver-class-name=com.mysql.jdbc.Driver

spring.datasource.secondary.url=ip2
spring.datasource.secondary.username=username2
spring.datasource.secondary.password=password2
spring.datasource.secondary.driver-class-name=com.mysql.jdbc.Driver

三个Java文件：

@Configuration
public class DataSourceConfig {
@Bean(name = "primaryDataSource")
@Qualifier("primaryDataSource")
@Primary
@ConfigurationProperties(prefix="spring.datasource.primary")
public DataSource primaryDataSource() {
return DataSourceBuilder.create().build();
}

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

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef="entityManagerFactoryPrimary",
transactionManagerRef="transactionManagerPrimary",
basePackages= { "com.txxs.dao1" }) //设置Repository所在位置
public class PrimaryConfig {

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

@Autowired
private JpaProperties jpaProperties;

@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.txxs.po1") //设置实体类所在位置
.persistenceUnit("primaryPersistenceUnit")
.build();
}

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());
}

}

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef="entityManagerFactorySecondary",
transactionManagerRef="transactionManagerSecondary",
basePackages= { "com.txxs.dao2" }) //设置Repository所在位置
public class SecondaryConfig {

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

@Autowired
private JpaProperties jpaProperties;

@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.txxs.po2") //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());
}

}

这样就可以实现spring data jpa的多数据源了，还是很简单的，有个问题是在实现的过程中总是会去加载第一个数据源，而不加载第二个数据源，报的错误如下：

14:49:22.316 [http-nio-9102-exec-2] INFO  c.txxs.task.ask - com.Aspect#aspect:50 - action=GET/v1/
Hibernate: select t.* from table1 t where ENAME like 'like%'
14:49:26.466 [http-nio-9102-exec-2] WARN  o.h.e.jdbc.spi.SqlExceptionHelper - SQL Error: 1146, SQLState: 42S02
14:49:26.467 [http-nio-9102-exec-2] ERROR o.h.e.jdbc.spi.SqlExceptionHelper - Table 'datasource.table1' doesn't exist

table1是数据源2中的表，怎么解决呢，添加如下注解，原因是@Autowired默认按照类型进行注入，加上@Qualifier后spring注解按照里边的字符串的名字进行注入了

@Qualifier("secondaryDataSource")
private DataSource secondaryDataSource;