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。