Java 使用SpringBoot的动态数据源

我正在使用SpringBoot编写一个微服务，需要动态选择数据源。我将根据参数选择数据源。每个数据源都指向具有相同模式（相同的表、触发器、存储过程等）的Oracle数据库。我如何实现这个要求？

我实现了类似的东西

我使用application.properties来存储数据源连接

Datasource drive name
spring.datasource.driver-class-name=
spring.datasource.url=
spring.datasource.username=
spring.datasource.password=

有一些关于如何读取和写入属性的代码示例

创建端点以更新属性

@PutMapping("/update")
    public ResponseEntity<?> updateConnection(@RequestBody final List<ConfigurationProperty> properies) {
        LOGGER.trace("Updating data source properties ");
        for (final ConfigurationProperty configurationProperty : properies) {
            config.getConfigurationProvider().persistDatabaseProperty(configurationProperty.getPropertyName(),
                    configurationProperty.getPropertyValue());
        }

            }
        }
        return new ResponseEntity<> (HttpStatus.OK);
    }

@PutMapping（“/update”）
公共响应属性更新连接（@RequestBody final List properties）{
LOGGER.trace（“更新数据源属性”）；
用于（最终配置属性配置属性：属性）{
config.getConfigurationProvider（）.persistDatabaseProperty（configurationProperty.getPropertyName（），
configurationProperty.getPropertyValue（））；
}
}
}
返回新的响应状态（HttpStatus.OK）；
}

经验中的另一个技巧是，在执行更新端点之前ping连接。：）

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对于我的实现，唯一的结论是，用户需要重新启动服务器才能对服务器进行更改

在启动时配置所有数据源，然后：

要么：

a。使用实现每个数据源的不同repo类，在调用相应的repo之前检查参数

---

b。有一个repo类检查参数并使用相应的数据源进行查询。

必须在application.properties中实现两个配置数据源，然后配置两个EntityManagerFactory和TransactionManager。您可以使用不同的存储库在两个数据源之间切换

应用程序属性

first.datasource.url=jdbc:oracle:thin:@//host:1521/firstdb
first.datasource.username=first
first.datasource.password=first
first.datasource.driver-class-name=oracle.jdbc.OracleDriver

second.datasource.url=jdbc:oracle:thin:@//host:1521/firstdb
second.datasource.username=second
second.datasource.password=second
second.datasource.driver-class-name=oracle.jdbc.OracleDriver

spring.jpa.database=default

向每个实体和存储库发送两个包，向设置发送两个配置

第一名：

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
  entityManagerFactoryRef = "entityManagerFactory",
  basePackages = { "com.system.first.repo" }
)
public class FirstDbConfig {

  @Primary
  @Bean(name = "dataSource")
  @ConfigurationProperties(prefix = "first.datasource")
  public DataSource dataSource() {
    return DataSourceBuilder.create().build();
  }

  @Primary
  @Bean(name = "entityManagerFactory")
  public LocalContainerEntityManagerFactoryBean 
  entityManagerFactory(
    EntityManagerFactoryBuilder builder,
    @Qualifier("dataSource") DataSource dataSource
  ) {
    return builder
      .dataSource(dataSource)
      .packages("com.system.first.domain")
      .persistenceUnit("first")
      .build();
  }

  @Primary
  @Bean(name = "transactionManager")
  public PlatformTransactionManager transactionManager(
    @Qualifier("entityManagerFactory") EntityManagerFactory 
    entityManagerFactory
  ) {
    return new JpaTransactionManager(entityManagerFactory);
  }
}

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
  entityManagerFactoryRef = "secondEntityManagerFactory",
  transactionManagerRef = "secondTransactionManager",
  basePackages = { "com.system.second.repo" }
)
public class SecondDbConfig {

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

  @Bean(name = "secondEntityManagerFactory")
  public LocalContainerEntityManagerFactoryBean 
  secondEntityManagerFactory(
    EntityManagerFactoryBuilder builder,
    @Qualifier("secondDataSource") DataSource dataSource
  ) {
    return
      builder
        .dataSource(dataSource)
        .packages("com.system.second.domain")
        .persistenceUnit("second")
        .build();
  }
  @Bean(name = "secondTransactionManager")
  public PlatformTransactionManager secondTransactionManager(
    @Qualifier("secondEntityManagerFactory") EntityManagerFactory
    secondEntityManagerFactory
  ) {
    return new JpaTransactionManager(secondEntityManagerFactory);
  }
}

秒：

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
  entityManagerFactoryRef = "entityManagerFactory",
  basePackages = { "com.system.first.repo" }
)
public class FirstDbConfig {

  @Primary
  @Bean(name = "dataSource")
  @ConfigurationProperties(prefix = "first.datasource")
  public DataSource dataSource() {
    return DataSourceBuilder.create().build();
  }

  @Primary
  @Bean(name = "entityManagerFactory")
  public LocalContainerEntityManagerFactoryBean 
  entityManagerFactory(
    EntityManagerFactoryBuilder builder,
    @Qualifier("dataSource") DataSource dataSource
  ) {
    return builder
      .dataSource(dataSource)
      .packages("com.system.first.domain")
      .persistenceUnit("first")
      .build();
  }

  @Primary
  @Bean(name = "transactionManager")
  public PlatformTransactionManager transactionManager(
    @Qualifier("entityManagerFactory") EntityManagerFactory 
    entityManagerFactory
  ) {
    return new JpaTransactionManager(entityManagerFactory);
  }
}

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
  entityManagerFactoryRef = "secondEntityManagerFactory",
  transactionManagerRef = "secondTransactionManager",
  basePackages = { "com.system.second.repo" }
)
public class SecondDbConfig {

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

  @Bean(name = "secondEntityManagerFactory")
  public LocalContainerEntityManagerFactoryBean 
  secondEntityManagerFactory(
    EntityManagerFactoryBuilder builder,
    @Qualifier("secondDataSource") DataSource dataSource
  ) {
    return
      builder
        .dataSource(dataSource)
        .packages("com.system.second.domain")
        .persistenceUnit("second")
        .build();
  }
  @Bean(name = "secondTransactionManager")
  public PlatformTransactionManager secondTransactionManager(
    @Qualifier("secondEntityManagerFactory") EntityManagerFactory
    secondEntityManagerFactory
  ) {
    return new JpaTransactionManager(secondEntityManagerFactory);
  }
}

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在springboot中尝试此AbstractRoutingDataSource