Spring boot reset datasource on the fly

Question

I am trying to update datasource in Spring Boot when the DB property like DB name, password or hostname changes in the spring configuration file or custom DB property file. When

Answer 1

In my project I used multitenancy . Basically I defined several datasources in properties like this:

primary.datasource.url=jdbc:postgresql://localhost:5432/db_name?currentSchema=schema_name
primary.datasource.username=user
primary.datasource.password=password
primary.datasource.driverClassName=org.postgresql.Driver
primary.datasource.driver-class-name=org.postgresql.Driver

secondary.datasource.url=jdbc:postgresql://localhost:5432/other_db?currentSchema=schema
secondary.datasource.username=user
secondary.datasource.password=password
secondary.datasource.driverClassName=org.postgresql.Driver
secondary.datasource.driver-class-name=org.postgresql.Driver

default.datasource.url=jdbc:postgresql://localhost:5432/default_db?currentSchema=public
default.datasource.username=user
default.datasource.password=password
default.datasource.driverClassName=org.postgresql.Driver
default.datasource.driver-class-name=org.postgresql.Driver

then in configuration class defined multiple datasources:

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

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

@Bean
@ConfigurationProperties(prefix="default.datasource")
public DataSource defaultDataSource(){
    return DataSourceBuilder.create().build();
}

and configured multitenancy basing on this and this article.
Pros:

• Easy tenant switch which could be triggered manually or even configured to be triggered on some specific header in request (filters).
• Could be cofigured to switch between schemas or databases.
  
• Happens dynamically ( you don't have to restart your beans )

Cons:

• You have to define all db possibilities in property file.
• You have to turn off schema validation because it will go nuts.