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Spring Boot——SpringBoot2+JPA+druid配置多数据源

开发环境

SpringBoot：2.2.1RELEASE
druid：1.1.20
JPA：2.2.1RELEASE
maven：3.5.0
java：1.8
MySQL：8.0.12

步骤

pom.xml配置如下（只列出和文章有关的pom配置）

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>superviserServer</groupId>
    <artifactId>com.test.superviser.server</artifactId>
    <version>1.0-SNAPSHOT</version>

    <name>superviserServer</name>
    <description>SuperviserServer Service of Test, Inc.</description>
    <properties>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
        <resource.delimiter>@</resource.delimiter>
        <spring-boot-starter.version>2.2.1.RELEASE</spring-boot-starter.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>5.2.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>${spring-boot-starter.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <version>${spring-boot-starter.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <version>${spring-boot-starter.version}</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.20</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.12</version>
            <exclusions>
                <exclusion>
                    <artifactId>protobuf-java</artifactId>
                    <groupId>com.google.protobuf</groupId>
                </exclusion>
            </exclusions>
        </dependency>
   
    </dependencies>

</project>

application.yml文件配置如下

spring:
  datasource:
    driverClassName: com.mysql.cj.jdbc.Driver

    # 使用 alibaba druid 连接池、监控
    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      primary :
        url: jdbc:mysql://localhost:3306/XXXXX?useUnicode=true&CharSet=utf8mb4&characterEncoding=utf8&characterSetResults=utf8&autoReconnect=true&autoReconnectForPools=true&rewriteBatchedStatements=true&allowMultiQueries=true&useSSL=false&serverTimezone=Asia/Shanghai
        username: XXXX
        password: XXXX
      secondary :
        url: jdbc:mysql://localhost:3306/XXXXXXX?useUnicode=true&CharSet=utf8mb4&characterEncoding=utf8&characterSetResults=utf8&autoReconnect=true&autoReconnectForPools=true&rewriteBatchedStatements=true&allowMultiQueries=true&useSSL=false&serverTimezone=Asia/Shanghai
        username: XXXX
        password: XXXX
      initial-size: 2
      min-idle: 5
      max-active: 10
      max-wait: 5000
      validation-query: SELECT 1
      test-on-borrow: false
      test-while-idle: true
      time-between-eviction-runs-millis: 18800
      web-stat-filter:
        enabled: true
        exclusions: js,gif,jpg,png,css,ico,/druid/*
      stat-view-servlet:
        enabled: true
        login-username: root
        login-password: druid2019
  jpa:
    hibernate:
      ddlAuto: update
    databasePlatform: org.hibernate.dialect.MySQL5InnoDBDialect
    showSql: true

注意
- yml文件中之所以把driverClassName放到datasource下面，是因为这个datasource属性是两个数据源共有的信息，所以可以共享。完全可以把driverClassName单独配置到每个数据源当中，效果是一样的

配置primary和secondary两个数据源

package ***************************;

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import org.slf4j.Logger;
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 *******
 * @Description: 多数据源配置
 * @date 2020/4/22
 */
@Configuration
public class DataSourceConfig {

    private static final Logger log = org.slf4j.LoggerFactory.getLogger(DataSourceConfig.class);

    @Primary
    @Bean(value = "primaryDataSource",initMethod = "init")
    @ConfigurationProperties("spring.datasource.druid.primary") //标红为yml文件中数据源路径:primary
    public DataSource dataSourceOne(){
        log.info("Init DataSourceOne");
        return DruidDataSourceBuilder.create().build();
    }

    @Bean(value = "secondDataSource",initMethod = "init")
    @ConfigurationProperties("spring.datasource.druid.secondary")//标红为yml文件中数据源路径：secondary
    public DataSource dataSourceTwo(){
        log.info("Init DataSourceTwo");
        return DruidDataSourceBuilder.create().build();
    }
}

注意
- 多数据源配置时，一定要区分主数据源和其他数据源。所以在主数据源初始化时一定要加上注解@Peimary，其余数据源初始化不可以使用这个注解，否则报错。

对应不同的数据源，需要匹配不同的JPA

主数据源primary JPA配置如下

package ***************************;

/**
 * @author ******
 * @Description: 主数据源 配置
 * @date 2020/4/22
 */

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.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;

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef = "entityManagerFactoryPrimary",
        transactionManagerRef = "transactionManagerPrimary",
        basePackages = {"com.xxxx.xxxxx.xxxxx.xxxx.repositories.mysql.record"}) //设置Repository所在位置
public class PrimaryJpaConfig {
    @Autowired
//    @Qualifier("primaryJpaProperties")
    private JpaProperties jpaProperties;
    @Autowired
    private HibernateProperties hibernateProperties;

    @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)// 设置数据源
                .properties(jpaProperties.getProperties())// 设置jpa配置
                .properties(getVendorProperties())// 设置hibernate配置
                .packages("com.xxxxx.xxxxx.xxxx.xxxxx.entities.superviser") //设置实体类所在位置
                .persistenceUnit("primaryPersistenceUnit")// 设置持久化单元名，用于@PersistenceContext注解获取EntityManager时指定数据源
                .build();
    }

    private Map getVendorProperties() {
        return hibernateProperties.determineHibernateProperties(jpaProperties.getProperties(), new HibernateSettings());

//        return jpaProperties.getHibernateProperties(new HibernateSettings());
    }

    @Primary
    @Bean(name = "transactionManagerPrimary")
    public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
        return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
    }

}

注意
- 主数据源JPA配置中，相对应的注入bean一定要加上注解@Primary，否则报错

第二数据源JPA配置如下

package *********************;

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.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;

/**
 * @author ********
 * @Description: 第二数据源配置
 * @date 2020/4/22
 */
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef = "entityManagerFactorySecond",
        transactionManagerRef = "transactionManagerSecond",
        basePackages = {"com.xxxxx.xxxxx.xxxx.xxxxx.repositories.mysql.integration"}) //设置Repository所在位置
public class SecondJpaConfig {
    @Autowired
//    @Qualifier("secondJpaProperties")
    private JpaProperties jpaProperties;
    @Autowired
    private HibernateProperties hibernateProperties;

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

    @Bean(name = "secondEntityManager")
    public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
        return entityManagerFactorySecond(builder).getObject().createEntityManager();
    }

    @Bean(name = "entityManagerFactorySecond")
    public LocalContainerEntityManagerFactoryBean entityManagerFactorySecond(EntityManagerFactoryBuilder builder) {
        return builder
                .dataSource(secondDataSource)
                .properties(jpaProperties.getProperties())// 设置jpa配置
                .properties(getVendorProperties())
                .packages("com.xxxxxx.xxxxxx.xxxxxx.xxxxx.entities.integration") //设置实体类所在位置
                .persistenceUnit("secondPersistenceUnit")
                .build();
    }

    private Map getVendorProperties() {
        return hibernateProperties.determineHibernateProperties(jpaProperties.getProperties(), new HibernateSettings());

//        return jpaProperties.getHibernateProperties(new HibernateSettings());
    }

    @Bean(name = "transactionManagerSecond")
    public PlatformTransactionManager transactionManagerSecond(EntityManagerFactoryBuilder builder) {
        return new JpaTransactionManager(entityManagerFactorySecond(builder).getObject());
    }
}

注意
- 除了主数据源，其他数据源JPA配置中，bean的注入方法都不能使用注解@Primary，否则报错

成功启动

注意点

@Primary注解的使用
目录结构中，JPA目录和实体类目录建议根据多数据源的配置进行分层，因为在多数据源配置中存在相关配置

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原文地址：https://www.cnblogs.com/zuiyue_jing/p/12757307.html

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