Springboot2.0配置JPA多数据源连接两个mysql数据库详解

1. 目录结构及配置

 pom.xml(不要乱放太多，会引起jar冲突，亲身体验)

<?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>

    <groupId>com.luoshupeng</groupId>
    <artifactId>multidatasource</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>SpringBoot2-MultiDataSource</name>
    <description>Spring Boot 2.0 多数据源练习程序</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

2. 配置文件

3. DataSourceConfigurer类（两种方法，取任何一种都可以，此程序中两种都有demo）

@Configuration
public class DataSourceConfigurer {

    /**
     * 第一种方法
     * @return
     */
    @Primary
    @Bean(name = "primaryDataSourceProperties")
    @ConfigurationProperties(prefix = "spring.datasource.primary")
    public DataSourceProperties primaryDataSourceProperties() {
        return new DataSourceProperties();
    }
    @Primary
    @Bean(name = "primaryDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.primary")
    public DataSource primaryDataSource() {
        return primaryDataSourceProperties().initializeDataSourceBuilder().build();
    }
    /**
     * 第二种方法
     * @return
     */
    @Bean(name = "secondaryDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.secondary")
    public DataSource secondaryDataSource() {
        return DataSourceBuilder.create().build();
    }
}

 

4. 主数据源配置

（需要改两处，1.注解处basePackages=“****”//此处对应程序dao层 全路径包名，2. LocalContainerEntityManagerFactoryBean方法下的.packeages(“***”)//pojo类全类名）

@Configuration

@EnableTransactionManagement

@EnableJpaRepositories(

        entityManagerFactoryRef = "entityManagerFactoryPrimary",

        transactionManagerRef = "transactionManagerPrimary",

        basePackages = {"com.luoshupeng.multidatasource.primary"})

public class PrimaryConfigurer {

    @Resource(name = "primaryDataSource")

    private DataSource primaryDataSource;

    @Autowired

    private JpaProperties jpaProperties;



    private Map<String, Object> getVendorProperties() {

        return jpaProperties.getHibernateProperties(new HibernateSettings());

    }



    @Primary

    @Bean(name = "entityManagerFactoryPrimary")

    public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary(EntityManagerFactoryBuilder builder) {

        return builder.dataSource(primaryDataSource).properties(getVendorProperties())

                .packages("com.luoshupeng.multidatasource.primary").persistenceUnit("primaryPersistenceUnit")

                .build();

    }



    @Primary

    @Bean(name = "entityManagerPrimary")

    public EntityManager entityManager(EntityManagerFactoryBuilder builder) {

        return entityManagerFactoryPrimary(builder).getObject().createEntityManager();

    }



    @Primary

    @Bean(name = "transactionManagerPrimary")

    public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {

        return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());

    }

}

5. 从数据源配置

（需要改两处，1.注解处basePackages=“****”//此处对应程序dao层 全路径包名，2. LocalContainerEntityManagerFactoryBean方法下的.packeages(“***”)//pojo类全类名）

@Configuration

@EnableTransactionManagement

@EnableJpaRepositories(

        transactionManagerRef = "transactionManagerSecondary",

        entityManagerFactoryRef = "entityManagerFactorySecondary",

        basePackages = {"com.luoshupeng.multidatasource.secondary.repository"})

public class SecondaryConfigurer {

    //@Resource(name = "secondaryDataSource")

    @Autowired

    @Qualifier(value = "secondaryDataSource")

    private DataSource secondaryDataSource;

    @Autowired

    private JpaProperties jpaProperties;



    private Map<String, Object> getVendorProperties() {

        return jpaProperties.getHibernateProperties(new HibernateSettings());

    }

    @Bean(name = "entityManagerFactorySecondary")

    public LocalContainerEntityManagerFactoryBean entityManagerFactorySecondary(EntityManagerFactoryBuilder builder) {

        return builder.dataSource(secondaryDataSource).properties(getVendorProperties())

                .packages("com.luoshupeng.multidatasource.secondary.repository").persistenceUnit("secondaryPersistenceUnit")

                .build();

    }

    @Bean(name = "entityManagerSecondary")

    public EntityManager entityManager(EntityManagerFactoryBuilder builder) {

        return entityManagerFactorySecondary(builder).getObject().createEntityManager();

    }
    @Bean(name = "transactionManagerSecondary")

    public PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) {

        return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());

    }

}

6. 其余代码就是restful请求 controller、dao、xml、service  略