SpringBoot+SpringDataJpa配置双数据源SqlServer和Mysql

有时候项目中会遇到需要配置双数据源的情况，到SpringBoot2.0版本后和之前配置双数据源的方法有些区别，这里我用的SpringBoot版本是2.0.3，废话不多说，给出主要步骤：

一、项目依赖pom.xml配置

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.3.RELEASE</version>
    <relativePath/> 
</parent>
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>com.microsoft.sqlserver</groupId>
        <artifactId>mssql-jdbc</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>

二、application.properties配置文件配置

datasource.main.jdbc-url=jdbc:sqlserver://xxxxxxxxxx:1433;DatabaseName=xxx
datasource.main.username=sa
datasource.main.password=xxxxxxx
datasource.main.driver-class-name=com.microsoft.sqlserver.jdbc.SQLServerDriver
spring.jpa.main.database=sql_server
spring.jpa.hibernate.main-dialect=org.hibernate.dialect.SQLServer2008Dialect
datasource.main.configuration.maximum-pool-size=30

datasource.second.jdbc-url=jdbc:mysql://localhost:3306/xxxxx?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC&useSSL=true
datasource.second.username=root
datasource.second.password=root
datasource.second.driver-class-name=com.mysql.jdbc.Driver
datasource.second.database=mysql
datasource.second.configuration.maximum-pool-size=30
mybatis.configuration.mapUnderscoreToCamelCase=true
spring.jpa.hibernate.second-dialect=org.hibernate.dialect.MySQL5Dialect

三、配置双数据源主要代码

1.创建主从数据源DataSourceConfig配置类

@Configuration
public class DataSourceConfig {


@Bean(name = "primaryDataSource")
@Primary
@Qualifier("primaryDataSource")
@ConfigurationProperties(prefix = "datasource.main")
public DataSource primaryDatasource() {
    return DataSourceBuilder.create().build();
}

@Bean(name = "secondaryDataSource")
@Qualifier("secondaryDataSource")
@ConfigurationProperties(prefix = "datasource.second")
public DataSource secondaryDataSource() {
    return DataSourceBuilder.create().build();
}

}

2.主数据源的配置

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
    entityManagerFactoryRef = "entityManagerFactoryPrimary",//配置连接工厂 entityManagerFactory
    transactionManagerRef = "transactionManagerPrimary", //配置 事物管理器  transactionManager
    basePackages = {"com.greek.www.dao"}//设置持久层所在位置
)
public class PrimaryConfig {

@Autowired
private JpaProperties jpaProperties;

@Autowired
@Qualifier("primaryDataSource")
private DataSource primaryDataSource;// 自动注入配置好的数据源

@Value("${spring.jpa.hibernate.main-dialect}")
private String primaryDialect;// 获取对应的数据库方言


/**
 *
 * @param builder
 * @return
 */
@Bean(name = "entityManagerFactoryPrimary")
@Primary
public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary(EntityManagerFactoryBuilder builder) {

    return builder
            //设置数据源
            .dataSource(primaryDataSource)
            //设置数据源属性
            .properties(getVendorProperties(primaryDataSource))
            //设置实体类所在位置.扫描所有带有 @Entity 注解的类
            .packages("com.greek.www.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("primaryPersistenceUnit")
            .build();

}

private Map<String, String> getVendorProperties(DataSource dataSource) {
    Map<String,String> map = new HashMap<>();
    map.put("hibernate.dialect",primaryDialect);// 设置对应的数据库方言
    //jpaProperties.getHibernate().getNaming().setPhysicalStrategy("org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl");
    jpaProperties.setProperties(map);
    return jpaProperties.getProperties();
}

/**
 * 配置事物管理器
 *
 * @param builder
 * @return
 */
@Bean(name = "transactionManagerPrimary")
@Primary
PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
    return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
}
}

3.从数据源的配置

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
    entityManagerFactoryRef="entityManagerFactorySecondary",
    transactionManagerRef="transactionManagerSecondary",
    basePackages= { "com.greek.www.repository" })
public class SecondaryConfig {

@Autowired
private JpaProperties jpaProperties;

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

@Value("${spring.jpa.hibernate.second-dialect}")
private String secondaryDialect;


@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.greek.www.domain")
            .persistenceUnit("secondaryPersistenceUnit")
            .build();
}

private Map<String, String> getVendorProperties(DataSource dataSource) {
    Map<String,String> map = new HashMap<>();
    map.put("hibernate.dialect",secondaryDialect);
   // jpaProperties.getHibernate().getNaming().setPhysicalStrategy("org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy");
   //jpaProperties.getHibernate().getNaming().setImplicitStrategy("org.springframework.boot.orm.jpa.hibernate.SpringImplicitNamingStrategy");
    jpaProperties.setProperties(map);
    return jpaProperties.getProperties();
}

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

}

这样双数据源的配置就完成了，但是有一个问题我没有解决，就是mysql数据库有下划线的字段不能解析，必须在实体类中加上注解指定字段，比如：

@Column(name = "rpt_time")
private Date rptTime;

双数据源的字段命名策略设置不生效，不知道为什么，如果有答案的小伙伴希望能告知。不胜感激！

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