SpringBoot+Jpa项目配置双数据源的实现

server:
  port: 8080
spring:
  profiles:
    active: dev
  jackson:
    time-zone: GMT+8  
    
# 这里是我们的数据库配置地方    
datasource:
    data1:  #这里是数据库一
      driverClassName: com.mysql.cj.jdbc.Driver
      url: jdbc:mysql://192.168.0.77:3306/test1?characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&autoReconnect=true&failOverReadOnly=false&rewriteBatchedStatements=true
      username: root
      password: 123
      type: com.alibaba.druid.pool.DruidDataSource

    data2:  #这里是数据库二
      driverClassName: com.mysql.cj.jdbc.Driver
      url: jdbc:mysql://192.168.0.88:3306/test2?characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&autoReconnect=true&failOverReadOnly=false&rewriteBatchedStatements=true
      username: root
      password: 123
      type: com.alibaba.druid.pool.DruidDataSource

package com.eman.cdn.common.dataSource;

import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.ImportAutoConfiguration;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
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 https://blog.csdn.net/weixin_42782429?spm=1000.2115.3001.5343
 * @date 2021/12/21 11:35
 * <p>
 * description 数据源配置
 */
@Configuration
public class DataSourceConfig {

 # 这里是我们在yml文件配置的位置
    private final static String DB_TEST1 = "spring.datasource.test1";
    private final static String DB_TEST2= "spring.datasource.test1";


 # 这个Bean名字子自定义只要不是重复的Bean名字就行了
    @Bean(name = "test1Properties")
    @Qualifier("test1Properties")
    @Primary
    @ConfigurationProperties(DB_TEST1)
    public DataSourceProperties test1Properties() {
        return new DataSourceProperties();
    }

    @Bean(name = "test1DataSource")
    @Qualifier("test1DataSource")
    @Primary
    @ConfigurationProperties(prefix = DB_TEST1)
    public DataSource test1DataSource() {
        return test1Properties().initializeDataSourceBuilder().build();
    }


    @Bean(name = "test2Properties")
    @Qualifier("test2Properties")
    @ConfigurationProperties(DB_TEST2)
    public DataSourceProperties test2Properties() {
        return new DataSourceProperties();
    }

    @Bean(name = "test2DataSource")
    @Qualifier("test2DataSource")
    @ConfigurationProperties(prefix = DB_ANALYSIS)
    public DataSource test2DataSource() {
        return test2Properties().initializeDataSourceBuilder().build();
    }
}

<!--mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.1.0</version>
        </dependency>

package com.eman.xx.xxx.xx;

import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateProperties;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateSettings;
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.core.io.support.PathMatchingResourcePatternResolver;
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.sql.DataSource;
import java.util.Objects;

/**
 * @author tongJie
 * @date 2021/12/21 11:59
 * <p>
 * description  日志处理端数据库配置
 */
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        // 配置连接工厂
        entityManagerFactoryRef = "tes1Factory",
        // 配置事物管理器
        transactionManagerRef = "tes1Transaction",
        // 设置Jpa 的 repository所在位置
        basePackages = {"com.xx.xx.xx.**.repository"}
)
// 设置扫描的mapper
@MapperScan(basePackages ="xx.xx.xx.test1.**.mapper", sqlSessionTemplateRef  = "tes1SqlSessionTemplate")
public class AnalysisDataBaseConfig {

    @Autowired
    @Qualifier("tes1DataSource")
    private DataSource analysisDataSource;

    @Autowired
    private JpaProperties jpaProperties;

    @Autowired
    private HibernateProperties properties;

    // 以下是jpa的配置

    /**
     * 连接工厂
     * @param builder 创建工具
     * @return 结果
     */
    @Bean(name = "tes1Factory")
    public LocalContainerEntityManagerFactoryBean tes1Factory(EntityManagerFactoryBuilder builder) {
        return builder
                // 设置数据源
                .dataSource(analysisDataSource)
                //设置实体类所在位置.扫描所有带有 @Entity 注解的类
                .packages("xx.xx.xx.tes1.**.entity")
                // Spring会将EntityManagerFactory注入到Repository之中.有了 EntityManagerFactory之后,
                // Repository就能用它来创建 EntityManager 了,然后 EntityManager 就可以针对数据库执行操作
                .persistenceUnit("tes1")
                // 为了加载yml中jpa下hibernate的相关配置
                .properties(properties.determineHibernateProperties(jpaProperties.getProperties(), new HibernateSettings()))
                .build();

    }

    /**
     * 配置事物管理器
     *
     * @param builder 创建工具
     * @return 结果
     */
    @Bean(name = "tes1Transaction")
    PlatformTransactionManager tes1Transaction(EntityManagerFactoryBuilder builder) {
        return new JpaTransactionManager(Objects.requireNonNull(analysisFactory(builder).getObject()));
    }

    // 以下是mybatis的配置

    /**
     * 配置sqlSessionFactory
     * @return 结果
     * @throws Exception 异常
     */
    @Bean("tes1SqlSessionFactory")
    public SqlSessionFactory tes1SqlSessionFactory() throws Exception {
        MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();
        sqlSessionFactory.setDataSource(analysisDataSource);
        sqlSessionFactory.setMapperLocations(new 
        //这里填写你mybaits的xml文件存放的路径
        PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/*.xml"));
        return sqlSessionFactory.getObject();
    }

    /**
     * 配置sqlSessionTemplate
     * @return 结果
     */
    @Bean(name = "tes1SqlSessionTemplate")
    public SqlSessionTemplate tes1SqlSessionTemplate() throws Exception {
        return new SqlSessionTemplate(tes1SqlSessionFactory());
    }
}