Spring-boot - How to load resources/datasources?

Question

I've been using Spring Boot and deploying the application via a .jar file. I want to load multiple datasources . When I was using local tomcat I used to add them to context.xml , but now I'm using the embedded tomcat and was wondering if it's possible to load them via some external file or some way which I would put on the server (UAT/PROD).

I've found a sample of how to do it via Java Class, but I was wondering if it's possible to do it other way as I'd like to leave the user/password out of the .jar and the configurations on a local file on the server. (looks easier/faster for future developments). Maybe using a " datasource.yml " or something similar..

Does anyone know how to achieve that?

Thanks!

My context.xml :

<?xml version='1.0' encoding='utf-8'?>
<Context>

    <!-- ABC QA -->
    <Resource
        name="jdbc/abc"
        type="javax.sql.DataSource"
        maxActive="5"
        maxIdle="2"
        username="xxx"
        maxWait="1000"
        validationQuery="select 1"         
        driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver"
        password="xxx"     
        url="jdbc:sqlserver://server-qa.com:1234;databaseName=myDB"/>

    <!-- DEF QA -->
    <Resource
        name="jdbc/def"
        type="javax.sql.DataSource"
        maxActive="5"
        maxIdle="2"
        username="xxx"
        maxWait="1000"
        validationQuery="select 1"         
        driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver"
        password="xxx"     
        url="jdbc:sqlserver://server2-qa.com:1234;databaseName=myDB"/>

</Context>

Ps.: In case anyone wants to check the java I refer to, the link is: https://github.com/wilkinsona/spring-boot-sample-tomcat-jndi/blob/master/src/main/java/sample/tomcat/jndi/SampleTomcatJndiApplication.java

Update:

after a bit of changes this code below now works in case anyone needs it! :)

application.yml

server:
  port: 9998

logging.level.org.springframework.web: DEBUG

spring.ds_db1:
  url: jdbc:sqlserver://mydb1.com:1433;databaseName=mydb1
  username: xxx
  password: xxx
  driverClassName: com.microsoft.sqlserver.jdbc.SQLServerDriver

spring.ds_db2:
  url: jdbc:sqlserver://mydb2.com:1433;databaseName=mydb2
  username: xxx
  password: xxx
  driverClassName: com.microsoft.sqlserver.jdbc.SQLServerDriver

DatabaseConfig

@Configuration
@ConfigurationProperties(prefix = "spring.ds_db1")
public class DatabaseDb1Config {

    @Bean(name="dsDb1")
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(env.getRequiredProperty("spring.ds_db1.driverClassName"));
        dataSource.setUrl(env.getRequiredProperty("spring.ds_db1.url"));
        dataSource.setUsername(env.getRequiredProperty("spring.ds_db1.username"));
        dataSource.setPassword(env.getRequiredProperty("spring.ds_db1.password"));

        return dataSource;
    }

    @Bean(name="jdbcDb1")
    public JdbcTemplate jdbcTemplate(DataSource dsChange) {
        return new JdbcTemplate(dsChange);
    }

}

Repository

@Service
public class ContractRepositoryImpl implements ContractRepository {

    @Autowired
    @Qualifier("jdbcDb1")
    protected JdbcTemplate jdbc;

    public Contract getContract(long id) {
        return jdbc.queryForObject("SELECT ...", contractMapper, id);
    }

    private static final RowMapper<Contract> contractMapper = new RowMapper<Contract>() {
        public Contract mapRow(ResultSet rs, int rowNum) throws SQLException {
            Contract contract = new Contract(rs.getLong("contract"), rs.getString("name"));
            return contract;
        }
    };

}

Relevant part from pom.xml

...
<spring.version>4.2.0.RELEASE</spring.version>
...

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <!-- SQL SERVER DRIVER FOR LEGACY CONNECTIONS -->
    <dependency>
        <groupId>com.microsoft.sqlserver</groupId>
        <artifactId>sqljdbc4</artifactId>
        <version>2.0</version>
    </dependency>

Answer 1

You can configure the datasources with application.properties (or .yml) files. See the list of available properties .

Spring Boot will read configuration files from different sources , one would be the directory in which the JAR file is stored, or you provide the values with System Properties or environment variables.