Spring启动 - 如何配置多个数据源 [英] Spring boot - how to configure multiple datasources

问题描述

我正在尝试使用Spring启动设置多个数据源（MySql，Postgres和Oracle）。我没有使用JPA。使用JdbcTemplate进行设置。

I am trying to setup multiple data sources(MySql, Postgres & Oracle) using Spring boot. I am not using JPA. Setting up with a JdbcTemplate.

我尝试过设置这样的东西。

I have tried setting up something like this.

application.properties

spring.datasource.test-oracle.username=test-oracle
spring.datasource.test-oracle.password=test-password
spring.datasource.test-oracle.url=dburl/test
spring.datasource.test-oracle.driver-class-name=oracle.jdbc.OracleDriver

spring.datasource.int-oracle.username=int-oracle
spring.datasource.int-oracle.password=int-password
spring.datasource.int-oracle.url=dburl/int
spring.datasource.int-oracle.driver-class-name=oracle.jdbc.driver.OracleDriver

spring.datasource.d.int-mysql.username=user
spring.datasource.d.int-mysql.password=password
spring.datasource.d.int-mysql.url=dburl/d
spring.datasource.d.int-mysql.driver-class-name=com.mysql.jdbc.Driver

spring.datasource.m.int-mysql.username=user
spring.datasource.m.int-mysql.password=password
spring.datasource.m.int-mysql.url=dburl/m
spring.datasource.m.int-mysql.driver-class-name=com.mysql.jdbc.Driver

spring.datasource.d.test-mysql.username=user
spring.datasource.d.test-mysql.password=password
spring.datasource.d.test-mysql.url=dburl/d
spring.datasource.d.test-mysql.driver-class-name=com.mysql.jdbc.Driver

spring.datasource.m.test-mysql.username=user
spring.datasource.m.test-mysql.password=password
spring.datasource.m.test-mysql.url=dburl/m
spring.datasource.m.test-mysql.driver-class-name=com.mysql.jdbc.Driver

MySqlConfiguration.java

@Configuration
public class MySqlConfiguration() {

   @Bean(name = "dMySql")
   @ConfigurationProperties(prefix = "spring.datasource.d.int-mysql")
   public DataSource mysqlDrupalDataSource() {
     return DataSourceBuilder.create().build();
   }

   @Bean(name = "dJdbc")
   public JdbcTemplate drupalJdbcTemplate(DataSource dMySql) {
      return new JdbcTemplate(dMySql);
   }

   @Bean(name = "mMySql")
   @ConfigurationProperties(prefix = "spring.datasource.m.int-mysql")
   public DataSource mysqlDrupalDataSource() {
      return DataSourceBuilder.create().build();
   }

   @Bean(name = "mJdbc")
   public JdbcTemplate drupalJdbcTemplate(DataSource mMySql) {
      return new JdbcTemplate(mMySql);
   }
}

OracleConfiguration.java

@Configuration
public class OracleConfiguration {

   @Primary
   @Bean(name = "tOracle")
   @ConfigurationProperties(prefix = "spring.datasource.test-oracle")
   public DataSource heOracleDataSource() {
      return DataSourceBuilder.create().build();
   }

   @Bean(name = "tOracleJdbc")
   public JdbcTemplate jdbcTemplate(DataSource tOracle) {
      return new JdbcTemplate(tOracle);
   }

   @Bean(name = "iOracle")
   @ConfigurationProperties(prefix = "spring.datasource.int-oracle")
   public DataSource heOracleDataSource() {
      return DataSourceBuilder.create().build();
   }

   @Bean(name = "iOracleJdbc")
   public JdbcTemplate jdbcTemplate(DataSource iOracle) {
      return new JdbcTemplate(iOracle);
   }
}

我不确定上述是否正确去做这个。当我根据引导文档使用@Primary时，总是使用具有@Primary的Bean。然后我在我的DAO实现中使用这样的配置

I am not sure if the above is the correct way to go about this. When I use @Primary as per the boot docs, the Bean that has @Primary is always used. Then I use the configurations in my DAO implementations like this

其中一个DAO实现

@Repository
public class DAOImpl implements DAOInterface {

    @Autowired
    @Qualifier("dJdbc")
    private JdbcTemplate jdbc;

    @Override
    public Map<String, Object> getBasicStudentInfo(String MAIL) {
        return jdbc.queryForMap(GET_BASIC_STUDENT_INFO, new Object[]{MAIL});
}

我该怎么做呢？我确实看到很多关于多个数据源的文章，但遗憾的是这些示例或解决方案并不适合我。

How do I go about doing this.? I did see many articles which is about mutliple datasources but unfortunately the examples or solutions don't suite me.

除此之外，我还需要能够查询数据库的数据。基于一些用户输入。因此，如果用户提供环境，例如test或int，我如何根据该输入触发正确的属性。

Further to this I need to be able to query against the DB's based on some user input. So if a user provides an environment e.g., "test" or "int", how can I trigger the correct properties based on that input.

我知道环境是@Autowired进入Spring启动我可以拦截用户输入，但不确定我应该如何在用户输入和DAO配置之间提供管道。

I understand that Environment is @Autowired into Spring boot and I can intercept the user input, but unsure how I should provide the plumbing between the user input and the DAO configurations.

如果某些事情不清楚或者需要我更多解释或需要更多代码，我可以提供。任何帮助解决这种情况将不胜感激。谢谢

If something is unclear or needs a bit more explanation from my side or need more code I can provide that. Any help to resolve this situation would be appreciated.Thanks

推荐答案

以下是您问题的完整解决方案...

Here is complete solution to your problem ...

您的配置类将如下所示：

Your configuration classes will look like this :

MySqlConfiguration.java

@Configuration
public class MySqlConfiguration() {

   @Bean(name = "dMySql")
   @ConfigurationProperties(prefix = "spring.datasource.d.int-mysql")
   public DataSource mysqlDrupalDataSource() {
     return DataSourceBuilder.create().build();
   }

   @Bean(name = "dJdbc")
   public JdbcTemplate drupalJdbcTemplate(@Qualifier("dMySql") DataSource dMySql) {
      return new JdbcTemplate(dMySql);
   }

   @Bean(name = "mMySql")
   @ConfigurationProperties(prefix = "spring.datasource.m.int-mysql")
   public DataSource mysqlDrupalDataSource() {
      return DataSourceBuilder.create().build();
   }

   @Bean(name = "mJdbc")
   public JdbcTemplate drupalJdbcTemplate(@Qualifier("mMySql") DataSource mMySql) {
      return new JdbcTemplate(mMySql);
   }
}

OracleConfiguration.java

@Configuration
public class OracleConfiguration {

   @Primary
   @Bean(name = "tOracle")
   @ConfigurationProperties(prefix = "spring.datasource.test-oracle")
   public DataSource heOracleDataSource() {
      return DataSourceBuilder.create().build();
   }

   @Bean(name = "tOracleJdbc")
   public JdbcTemplate jdbcTemplate(@Qualifier("tOracle") DataSource tOracle) {
      return new JdbcTemplate(tOracle);
   }

   @Bean(name = "iOracle")
   @ConfigurationProperties(prefix = "spring.datasource.int-oracle")
   public DataSource heOracleDataSource() {
      return DataSourceBuilder.create().build();
   }

   @Bean(name = "iOracleJdbc")
   public JdbcTemplate jdbcTemplate(@Qualifier("iOracle") DataSource iOracle) {
      return new JdbcTemplate(iOracle);
   }
}

在您的DAO课程中，您可以自动装配JdbcTemplate像这样：

and in your DAO class , you can autowire the JdbcTemplate like this :

@Repository
public class DAOImpl implements DAOInterface {

    @Autowired
    @Qualifier("dJdbc")
    private JdbcTemplate dJdbc;

    @Autowired
    @Qualifier("mJdbc")
    private JdbcTemplate mJdbc;

    @Autowired
    @Qualifier("tOracleJdbc")
    private JdbcTemplate tOracleJdbc;

    @Autowired
    @Qualifier("iOracleJdbc")
    private JdbcTemplate iOracleJdbc;

    @Override
    public Map<String, Object> getBasicStudentInfo(String MAIL) {
        return dJdbc.queryForMap(GET_BASIC_STUDENT_INFO, new Object[]{MAIL});
    }

    .
    .
    .
}

注意：确保使用@Primary注释注释其中一个DataSource

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