OpenTable Embedded PostgreSQL Component

Allows embedding PostgreSQL into Java application code with no external dependencies. Excellent for allowing you to unit test with a "real" Postgres without requiring end users to install and set up a database cluster.

Basic Usage

In your JUnit test just add:

@Rule
public EmbeddedPostgreSQLRule pg = new EmbeddedPostgreSQLRule();

This simply has JUnit manage an instance of EmbeddedPostgreSQLRule (start, stop). You can then use this to get a DataSource with: pg.getEmbeddedPostgreSQL().getPostgresDatabase();

Additionally you may use the EmbeddedPostgres class directly by manually starting and stopping the instance; see EmbeddedPostgresTest for an example.

Flyway Migrator

You can easily integrate Flyway database schema migration:

@Rule
public PreparedDbRule db =
    EmbeddedPostgresRules.preparedDatabase(
        FlywayPreparer.forClasspathLocation("db/my-db-schema"));

This will create an independent database for every test with the given schema loaded from the classpath. Database templates are used so the time cost is relatively small, given the superior isolation truly independent databases gives you.

Postgres version

The JAR file contains bundled version of Postgres. You can pass different Postgres version by implementing PgBinaryResolver.

Example:

class ClasspathBinaryResolver implements PgBinaryResolver {
    public InputStream getPgBinary(String system, String machineHardware) throws IOException {
        ClassPathResource resource = new ClassPathResource(format("pgsql/postgresql-%s-%s.tbz", system, machineHardware));
        return resource.getInputStream();
    }
}

EmbeddedPostgreSQL
            .builder()
            .setPgBinaryResolver(new ClasspathBinaryResolver())
            .start();

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