Springboot整合JPA多数据源(Oracle+Mysql)

Springboot整合JPA多数据源

  • 1. Maven
  • 2. 基本配置
    • 2.1 DataSource
  • 3. 多数据源配置
    • 3.1 JpaConfigOracle
    • 3.2 JpaConfigMysql
  • 4. Dao层接口

1. Maven

<dependency>
   <groupId>org.springframework.bootgroupId>
    <artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
    <groupId>org.springframework.bootgroupId>
    <artifactId>spring-boot-starter-data-jpaartifactId>
dependency>

<dependency>
    <groupId>com.alibabagroupId>
    <artifactId>druid-spring-boot-starterartifactId>
    <version>1.2.9version>
dependency>
<dependency>
    <groupId>com.oracle.database.jdbcgroupId>
    <artifactId>ojdbc8artifactId>
    <scope>runtimescope>
dependency>
<dependency>
    <groupId>mysqlgroupId>
    <artifactId>mysql-connector-javaartifactId>
    <version>8.0.16version>
dependency>

2. 基本配置

2.1 DataSource

在基本配置中,我们首先来配置多数据源基本信息以及DataSource,首先在application.yml中添加如下配置信息:

spring:
  datasource:
    # oracle数据库配置
    oracle:
      driver-class-name: oracle.jdbc.driver.OracleDriver
      url: jdbc:oracle:thin:@localhost:1521:orcl
      username: test
      password: test
    # mysql数据库配置
    mysql:
      driver-class-name: com.mysql.cj.jdbc.Driver
      url: jdbc:mysql://localhost:3306/swap_business_db?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai
      username: root
      password: root
    type: com.alibaba.druid.pool.DruidDataSource
    # druid数据库连接池
    druid:
      filters: stat
      initialSize: 5
      maxActive: 20
      maxPoolPreparedStatementPerConnectionSize: 20
      maxWait: 60000
      minEvictableIdleTimeMillis: 30000
      minIdle: 5
      poolPreparedStatements: false
      testOnBorrow: false
      testOnReturn: false
      testWhileIdle: true
      timeBetweenEvictionRunsMillis: 60000
      #Oracle模式
      validation-query: SELECT 1 FROM DUAL #用来检测连接是否有效的sql
      #MySQL模式
      validation-queryM: SELECT 1 #用来检测连接是否有效的sql
  jpa:
    hibernate:
      ddl-auto: none
      oracle-dialect: org.hibernate.dialect.Oracle10gDialect
      mysql-dialect: org.hibernate.dialect.MySQL8Dialect
    show-sql: false

接下来配置两个DataSource,如下:

@Configuration
public class DataSourceConfig {

    @Bean
    @ConfigurationProperties(prefix = "spring.datasource.oracle")
    @Primary
    DataSource dsOracle() {
        return DruidDataSourceBuilder.create().build();
    }

    @Bean
    @ConfigurationProperties(prefix = "spring.datasource.mysql")
    DataSource dsMysql() {
        return DruidDataSourceBuilder.create().build();
    }
}

注意:@Primary,这个注解一定不能少,否则在项目启动时会出错,@Primary表示当某一个类存在多个实例时,优先使用哪个实例。

3. 多数据源配置

接下来配置Jpa的基本信息,这里两个数据源,分别在两个类中来配置,oracle和mysql配置如下:

3.1 JpaConfigOracle

@Configuration
@EnableJpaRepositories(basePackages = "cn.piesat.dao.oracle",
        entityManagerFactoryRef = "localContainerEntityManagerFactoryBeanOracle",
        transactionManagerRef = "platformTransactionManagerOracle")
public class JpaConfigOracle {
    @Autowired
    @Qualifier(value = "dsOracle")
    DataSource dsOracle;

    @Autowired
    JpaProperties jpaProperties;
    @Autowired
    private HibernateProperties hibernateProperties;

    @Value("${spring.jpa.hibernate.oracle-dialect}")
    private String oracleDialect;
    @Value("${spring.jpa.show-sql}")
    private String showSql;


    @Bean
    @Primary
    LocalContainerEntityManagerFactoryBean localContainerEntityManagerFactoryBeanOracle(EntityManagerFactoryBuilder builder) {
        return builder.dataSource(dsOracle)
                .packages("cn.piesat.model")
                .properties(getVendorProperties())
                .persistenceUnit("pu1")
                .build();
    }

    /**
     * 设置数据源属性
     *
     * @return
     */
    private Map<String, Object> getVendorProperties() {
        Map<String, String> map = new HashMap<>();
        // 设置oracle数据库方言
        map.put("hibernate.dialect", oracleDialect);
        map.put("show-sql", showSql);
        jpaProperties.setProperties(map);
        return hibernateProperties.determineHibernateProperties(
                jpaProperties.getProperties(), new HibernateSettings());
    }

    /**
     * 配置事务管理器
     *
     * @param builder
     * @return
     */
    @Bean
    PlatformTransactionManager platformTransactionManagerOracle(EntityManagerFactoryBuilder builder) {
        LocalContainerEntityManagerFactoryBean factoryBeanOracle = localContainerEntityManagerFactoryBeanOracle(builder);
        return new JpaTransactionManager(factoryBeanOracle.getObject());
    }
}

配置说明:JpaProperties是系统提供的一个实例,里边的数据就是我们在application.yml中配置的jpa相关的配置。HibernateProperties用来手动设置数据源属性,例如定义不同的数据库方言。然后我们提供两个Bean,分别是LocalContainerEntityManagerFactoryBeanPlatformTransactionManager事务管理器,不同于MyBatis和JdbcTemplate,在Jpa中,事务一定要配置。在提供LocalContainerEntityManagerFactoryBean的时候,需要指定packages,这里的packages指定的包就是这个数据源对应的实体类所在的位置,另外在这里配置类上通过@EnableJpaRepositories注解指定dao所在的位置,以及LocalContainerEntityManagerFactoryBean和PlatformTransactionManager分别对应的引用的名字。

这样第一个就配置好了,第二个基本和这个类似,主要有几个不同点:

  • dao的位置不同
  • persistenceUnit不同
  • 相关bean的名称不同

3.2 JpaConfigMysql

@Configuration
@EnableJpaRepositories(basePackages = "cn.piesat.dao.mysql",
        entityManagerFactoryRef = "localContainerEntityManagerFactoryBeanMysql",
        transactionManagerRef = "platformTransactionManagerMysql")
public class JpaConfigMysql {
    @Autowired
    @Qualifier(value = "dsMysql")
    DataSource dsMysql;

    @Autowired
    JpaProperties jpaProperties;

    @Autowired
    private HibernateProperties hibernateProperties;

    @Value("${spring.jpa.hibernate.mysql-dialect}")
    private String mysqlDialect;
    @Value("${spring.jpa.show-sql}")
    private String showSql;


    @Bean
    LocalContainerEntityManagerFactoryBean localContainerEntityManagerFactoryBeanMysql(EntityManagerFactoryBuilder builder) {
        return builder.dataSource(dsMysql)
                .packages("cn.piesat.model")
                .properties(getVendorProperties())
                .persistenceUnit("pu2")
                .build();
    }

    /**
     * 设置数据源属性
     *
     * @return
     */
    private Map<String, Object> getVendorProperties() {
        Map<String, String> map = new HashMap<>();
        // 设置mysql数据库方言
        map.put("hibernate.dialect", mysqlDialect);
        map.put("show-sql", showSql);
        jpaProperties.setProperties(map);
        return hibernateProperties.determineHibernateProperties(
                jpaProperties.getProperties(), new HibernateSettings());
    }

    /**
     * 配置事务管理器
     *
     * @param builder
     * @return
     */
    @Bean
    PlatformTransactionManager platformTransactionManagerMysql(EntityManagerFactoryBuilder builder) {
        LocalContainerEntityManagerFactoryBean factoryBeanMysql = localContainerEntityManagerFactoryBeanMysql(builder);
        return new JpaTransactionManager(factoryBeanMysql.getObject());
    }
}

4. Dao层接口

接下来,在对应位置分别提供相关的实体类和dao即可,注意:实体类可以共用,dao的位置不同

oracle接口:

package cn.piesat.dao.oracle;

public interface TMasOrbitInfoDao extends JpaRepository<TMasOrbitInfo, String> {
    List<TMasOrbitInfo> findBySatelliteAndObservationDateBetween(String satellite, String start, String end);
}

mysql接口:

package cn.piesat.dao.mysql;

public interface SwapBusinessEfficiencyMainDao extends JpaRepository<SwapBusinessEfficiencyMain, String> {
    List<SwapBusinessEfficiencyMain> findByDataIdentifyAndDataTimeBetween(String identify, String start, String end);
}

到此,所有的配置就算完成了,接下来就可以在Service中注入不同的Dao,不同的Dao操作不同的数据源。

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