springboot 多数据源配置与使用

多数据源配置

application.properties
配置两个数据库

#数据库配置#
spring.datasource.primary.driverClassName = com.mysql.jdbc.Driver
spring.datasource.primary.url = jdbc:mysql://x.x.x.x:3306/hll
spring.datasource.primary.username = ****
spring.datasource.primary.password = ****

spring.datasource.secondary.driverClassName = com.mysql.jdbc.Driver
spring.datasource.secondary.url = jdbc:mysql://localhost:3306/mydata
spring.datasource.secondary.username = root
spring.datasource.secondary.password = root

创建主数据源配置文件

package com.hll.hlladmin.config;

import java.util.Map;

import javax.persistence.EntityManager;
import javax.sql.DataSource;

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;

/**
 * @author hll
 */
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef="entityManagerFactoryPrimary", 
        transactionManagerRef="transactionManagerPrimary", 
        basePackages = {"com.hll.hlladmin.dao.primary"} ) //basePackages。Repository所在的位置，主数据源要和次数据源所在的包要分开
public class PrimaryConfig {

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

    @Autowired
    private JpaProperties jpaProperties;

    @Primary //该注解表示为主数据源
    @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.hll.hlladmin.model.primary") //主数据源实体所在位置
                .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());
    }
}

创建次数据源配置文件

package com.hll.hlladmin.config;

import java.util.Map;

import javax.persistence.EntityManager;
import javax.sql.DataSource;

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;

/**
 * @author hll
 */
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef="entityManagerFactorySecondary",
        transactionManagerRef="transactionManagerSecondary",
        basePackages = {"com.hll.hlladmin.dao.secondary"}) //次数据源repository所在位置
public class SecondaryConfig {

    @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.hll.hlladmin.model.secondary") //次数据源实体所在位置
                .persistenceUnit("secondaryPersistenceUnit")
                .build();
    }

    @Autowired
    private JpaProperties jpaProperties;

    private Map<String, String> getVendorProperties(DataSource dataSource) {
        return jpaProperties.getHibernateProperties(dataSource);
    }

    @Bean(name="transactionManagerSecondary")
    PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) {
        return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());
    }
}

主数据源和次数据源下dao类，model类省略了

注意主次数据源下的dao类和model类的位置

创建请求Controller

package com.hll.hlladmin.controller;

import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.hll.hlladmin.dao.primary.UserDao;
import com.hll.hlladmin.dao.secondary.ConfigDao;
import com.hll.hlladmin.model.primary.User;
import com.hll.hlladmin.model.secondary.Config;
import com.hll.hlladmin.utils.JsonResult;

/**
 * @author hll 
 */
@Controller
@RequestMapping(value = "/hlladmin/test")
public class TestController {

    @Autowired
    private UserDao userDao;
    @Autowired
    private ConfigDao configDao;

    @RequestMapping(value = "test")
    @ResponseBody
    public JsonResult test() {
        User user = userDao.findAll().get(0);

        Config config = configDao.findAll().get(0);

        Map<String, String> map = new LinkedHashMap<String, String>();
        map.put("数据源1：", user.toString());
        map.put("数据源2：", config.toString());
        return new JsonResult(200, "查询成功", map);
    }

}

访问：http://localhost:8080/hll-admin/hlladmin/test/test
浏览器打印数据如下：

{“code”:200,”msg”:”查询成功”,”data”:{“数据源1：”:”User [id=1, name=主数据源]”,”数据源2：”:”Config [id=1, name=次数据源]”}}