Spring boot - 配置第二个数据源以及gloud gcp postgresql主数据源

Question

Setting up our Spring Boot project we have a database hosted on Google Cloud Gcp. We use Spring Data JPA to manipulate our database objects and it works great.

application.yaml

spring:
  jpa:
database-platform: org.hibernate.dialect.PostgreSQL95Dialect
properties:
  hibernate:
    default_schema: {schema}
    dialect : org.hibernate.dialect.PostgreSQL95Dialect
datasource:
  username: {username}
  password: {pwd}
cloud:
  gcp:
    sql:
      database-name: {dbname}
      instance-connection-name: {connection-name}

pom.xml

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-gcp-starter-sql-postgresql</artifactId>
</dependency>

Using this Spring boot is able to autoconfigure the database connection and we are using Spring Data JPA to manipulate database objects.

This datasource is only used by our project, but our company has an Oracle database used by our ERP that I need to use. I figured I would use JdbcTemplate.

So I setup a Datasource and a JdbcTemplate linked to it :

DatasourceConfiguration.java

@Bean(name = "dataSourceGenerix")
public DataSource dataSourceGenerix() {
    final DriverManagerDataSource dataSource = new DriverManagerDataSource();

    dataSource.setDriverClassName(generixDatasourceDriver);
    dataSource.setUrl(generixDatasourceUrl);
    dataSource.setUsername(generixDatasourceUsername);
    dataSource.setPassword(generixDatasourcePassword);
    return dataSource;
}

@Bean
public NamedParameterJdbcTemplate jdbcTemplateGenerix(@Qualifier("dataSourceGenerix") DataSource dataSourceGenerix) {
    NamedParameterJdbcTemplate jdbcTemplate = null;

    try(Connection conn = DataSourceUtils.getConnection(dataSourceGenerix)) {
        jdbcTemplate = new NamedParameterJdbcTemplate(dataSourceGenerix);
    } catch (SQLException | CannotGetJdbcConnectionException e) {
        log.error("{} {} : {}", Constantes.NO_DB_CONNECTION_GENERIX, generixDatasourceUrl, e.getMessage());
    }
    return jdbcTemplate;
}

With that setup, I can perform requests on this datasource.

But since I configures a Datasource explicitely, JPA now executes requests on that one and does not Autoconfigure my CLoud SQL datasource anymore.

I tried setting up a @Primary Datasource and explicitly configure parameters :

@Bean
@Primary
DataSource dataSource() {
    DriverManagerDataSource dataSource = new DriverManagerDataSource();

    dataSource.setUrl("jdbc:postgresql://google/{dbname}?cloudSqlInstance={instancename}&socketFactory=com.google.cloud.sql.postgres.SocketFactory");
    dataSource.setUsername({username});
    dataSource.setPassword({pwd});

    return dataSource;
}

Here's the logs at startup :

c.g.cloud.sql.core.SslSocketFactory : Obtaining ephemeral certificate for Cloud SQL instance [{instancename}].
o.s.b.a.orm.jpa.DatabaseLookup      : Unable to determine jdbc url from datasource
org.springframework.jdbc.support.MetaDataAccessException: Could not get Connection for extracting meta-data; nested exception is org.springframework.jdbc.CannotGetJdbcConnectionException:
Caused by: java.lang.RuntimeException: Unable to retrieve information about Cloud SQL instance
Caused by: java.net.SocketTimeoutException: connect timed out

So it seems like it cannot get to connect to Cloud SQL instance. I'm using the exact same parameters that I use in the application.yaml.

So how can I keep the autoconfiguration to Cloud GCP for my JPA needs, and add a second datasource for jdbc template ?

Answer 1

You can refer to these articles -> spring-data-jpa-multiple-databases or using-multiple-datasources-with-spring-boot

Basically while defining and initializing data source, you can specify the base package name of repositories which will use that particular data source.

Eg in configuration class of oracle, you can specify base package of repository which will use oracle db and in Cloud GCP you can specify package containing repositories which will contact to Cloud GCP.

Answer 2

Check the repositories, please review this example.

https://medium.com/@joeclever/using-multiple-datasources-with-spring-boot-and-spring-data-6430b00c02e7

https://www.javaguides.net/2018/09/spring-boot-jpa-multiple-data-sources-example.html