How to specify the primary data source when configuring multiple data sources in Spring Boot?

1 year ago
Emily Johnson
1 minute

You can specify the primary data source by using the property spring.datasource.primary in the configuration file. For example:

spring.datasource.primary=primaryDataSource
spring.datasource.secondary=secondaryDataSource

Next, in the data source configuration class, use the @Primary annotation to specify the primary data source. For example:

@Configuration
public class DataSourceConfig {

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

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

}

In this way, the primaryDataSource will be designated as the main data source.

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