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Spring boot配置多数据源代码实例

时间:2020-07-09 11:25     来源/作者:阮帅

因项目需要在一个应用里从两个数据库取数,所以需要配置多数据源,网上找了好多方法才启动成功,整理如下。注意两个数据源的repository文件名不能相同,即使在不同的文件夹下,否则系统启动会报错。

配置文件

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spring.datasource.primary.url=***
spring.datasource.primary.username=***
spring.datasource.primary.password=***
spring.datasource.primary.driver-class-name=com.mysql.jdbc.Driver
 
spring.datasource.second.url=***
spring.datasource.second.username=***
spring.datasource.second.password=***
spring.datasource.second.driver-class-name=com.mysql.jdbc.Driver

通用数据源配置

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import com.alibaba.druid.pool.DruidDataSource;
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;
 
/**
 * @author ruanshuai
 * @date 2020/5/13
 */
 
@Configuration
public class DataSourceConfig {
 
  /**
   * 第一个数据连接,默认优先级最高
   * @return
   */
  @Primary
  @Bean(name = "primaryDataSource") //数据源1配置名
  @Qualifier("primaryDataSource") //数据源1配置名
  @ConfigurationProperties(prefix="spring.datasource.primary") //见配置文件
  public DataSource PrimaryDataSource() {
    return DataSourceBuilder.create().type(DruidDataSource.class).build();
  }
 
  /**
   * 第二个数据源
   * @return
   */
  @Bean(name = "secondDataSource") //数据源2配置名
  @Qualifier("secondDataSource") //数据源2配置名
  @ConfigurationProperties(prefix="spring.datasource.second") //见配置文件
  public DataSource secondaryDataSource() {
    return DataSourceBuilder.create().type(DruidDataSource.class).build();
  }
}

数据源1配置

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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.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 ruanshuai
 * @date 2020/5/13
 */
 
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
    entityManagerFactoryRef="entityManagerFactoryPrimary",
    transactionManagerRef="transactionManagerPrimary",
    basePackages= { "***此处为数据源1 repository的存放文件夹***" })
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())
        .packages("***实体类所在文件夹,两个数据源的实体类可相同***")
        .persistenceUnit("primaryPersistenceUnit")
        .build();
  }
 
 
 
  private Map<String, String> getVendorProperties() {
    Map<String, String> jpaProperties = new HashMap<>(16);
    jpaProperties.put("hibernate.hbm2ddl.auto", "update");
    jpaProperties.put("hibernate.show_sql", System.getProperty("spring.jpa.show-sql"));
    jpaProperties.put("hibernate.dialect", System.getProperty("spring.jpa.properties.hibernate.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());
  }
}

数据源2配置

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import org.omg.CORBA.Environment;
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.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 ruanshuai
 * @date 2020/5/13
 */
 
@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= { "***此处为数据源1 repository的存放文件夹***" })
public class SecondConfig {
 
  @Autowired
  @Qualifier("secondDataSource")
  private DataSource secondDataSource;
 
 
  @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("***实体类所在文件夹,两个数据源的实体类可相同***")
        .persistenceUnit("secondPersistenceUnit")
        .build();
  }
 
  private Map<String, String> getVendorProperties() {
    Map<String, String> jpaProperties = new HashMap<>(16);
    jpaProperties.put("hibernate.hbm2ddl.auto", "update");
    jpaProperties.put("hibernate.show_sql", System.getProperty("spring.jpa.show-sql"));
    jpaProperties.put("hibernate.dialect", System.getProperty("spring.jpa.properties.hibernate.dialect"));
    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());
  }
}

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。

原文链接:https://www.cnblogs.com/ruanshuai/p/13252625.html

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