Why are postgresql tables empty although filled when starting Testcontainer? - sql

Question

I am using Testcontainers 1.15.2 (using postgres image 13.2-alpine) with Spring Boot 2.4.3. The Testcontainer is started using an init script which starts with a type definition, a table creation and insert values into it. I even perform a COMMIT; at the end but did not define a schema or so.
When I start the Spring Boot app the console output shows me that the init script was executed successfully.
When I execute a SELECT * FROM the result is empty. So...why are the postgresql tables empty although I did inserts before?
CREATE TYPE Erklaerungstyp AS ENUM ('AAAAA', 'BBBBB', 'CCCCC', 'DDDDD');
CREATE TYPE Geschlecht AS ENUM ('D', 'F', 'M');
DROP TABLE IF EXISTS Anschrift;
CREATE TABLE Anschrift (
a_id SERIAL PRIMARY KEY,
Zusatz VARCHAR(255),
Strasse VARCHAR(30) NOT NULL,
Hausnummer VARCHAR(30) NOT NULL,
plz VARCHAR(5) NOT NULL,
Ort VARCHAR(80) NOT NULL,
Bundesland VARCHAR(20),
Land VARCHAR(20) NOT NULL,
create_Date DATE NOT NULL,
modify_Date DATE
);
INSERT INTO Anschrift VALUES (1, null, 'Musterstrasse', '13M', '12345', 'Berlin', 'Berlin', 'Deutschland', '2001-09-28');
INSERT INTO Anschrift VALUES (2, 'bei Müller', 'Musterweg', '1-3', '54321', 'Musterhausen', 'Muster-Hausen', 'Deutschland', '2002-03-11');
DROP TABLE IF EXISTS Person;
CREATE TABLE Person (
ep_id SERIAL PRIMARY KEY,
Geschlecht Geschlecht,
Vorname VARCHAR(30) NOT NULL,
Familienname VARCHAR(30) NOT NULL,
Geburtsname VARCHAR(30) NOT NULL,
Titel VARCHAR(10),
Geburtsdatum Date NOT NULL,
Geburtsort VARCHAR(30),
Anschrift INTEGER REFERENCES Anschrift(a_id),
Email VARCHAR(80),
Telefon VARCHAR(20),
Versichertennummer VARCHAR(15) NOT NULL,
create_Date DATE NOT NULL,
modify_Date DATE
);
INSERT INTO Person VALUES (1, 'M', 'Max', 'Mustermann', 'Mustermann', 'Dipl.-Inf.', '01.01.1901', 'Berlin', 1, 'Max.Mustermann#max.de',
'0111 12 34 56 789', 'X000Y111Z999', '2001-09-28');
COMMIT;
I instantiate the Testcontainer in an abstract superclass for tests to be used in all inheriting subclassing tests:
#ActiveProfiles("test")
#Testcontainers
#SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public abstract class AbstractApplicationIT {
final static DockerImageName POSTGRES_IMAGE = DockerImageName.parse("postgres:13.2-alpine");
#Container
public static PostgreSQLContainer<?> postgreSQLContainer = new PostgreSQLContainer<>(POSTGRES_IMAGE);
#Test
public void contextLoads() {
}
}
In a subclass I do:
#Transactional
#TestInstance(TestInstance.Lifecycle.PER_CLASS)
public class XxxIT extends AbstractApplicationIT {
#Value("${spring.datasource.password}")
private String password;
#Value("${spring.datasource.username}")
private String username;
#Value("${spring.datasource.dbname}")
private String dbName;
#Value("${spring.datasource.initScript}")
private String initScript;
#Autowired
private AnschriftJpaDao dao;
#Autowired
private XxxService xxxService;
#BeforeAll
public void setup() {
postgreSQLContainer = new PostgreSQLContainer<>(POSTGRES_IMAGE)
.withDatabaseName(dbName)
.withUsername(username)
.withPassword(password)
.withInitScript(initScript);
postgreSQLContainer.start();
}
#Test
public void checkDbContainerIsAlive() {
assertThat(this.dao.findAll()).isNotNull();
}
}
...and the test is green but when I do
#Test
public void anschrift_can_be_found() {
assertThat(this.dao.findAll().size() == 1);
List<Anschrift> anschriftList = this.dao.findAll();
System.out.println(anschriftList.size());
}
...the test is green but anschriftList is empty. Why?
And if I use Anschriften PK as a FK in Person entity...I get a LazyLoadingException although specifying fetch = FetchType.EAGER in the relationship definitions. Why?

Answer 1

In my application-test.yaml I defined
jpa:
hibernate:
ddl-auto: create-drop
as I found this on the internet.
-> Outcommenting this line leads to filled tables.