H2 database "if" query grammar [duplicate] - database

Question

I have some problems with using a schema.sql file to create my sql schema when executing a junit test while this schema contains mysql specific expression. I have to add the mode=mysql to the H2 url.
For example something like this:
jdbc:h2:mem:testd;MODE=MYSQL
But Spring boot automatically uses the url defined in the enum
org.springframework.boot.autoconfigure.jdbc.EmbeddedDatabaseConnection with its url
jdbc:h2:mem:testdb;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE.
I have tried similiar approaches to get this to work, but spring does not take the spring.datasource.url=jdbc:h2:mem:testdb;MODE=MYSQL from my test-application.properties. All other settings from my test-application.properties have been read successfully.
If I let spring/hibernate create the schema (without the schema.sql file) with the javax.persistence annotations in my entities everything works fine.
Is there a simple way to add a mode?

Answer 1

Set
spring.datasource.url=jdbc:h2:mem:testdb;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE;MODE=MYSQL
in application-test.properties, plus
#RunWith(SpringRunner.class)
#DataJpaTest
#AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
#ActiveProfiles("test")
on the test class

Answer 2

I was having this same issue. It would not pick up the url when running tests. I'm using flyway to manage my scripts. I was able to get all of these working together by following these few steps.
Created a V1_init.sql script in src/test/resources/db/migration so that it is the first script run by flyway.
SET MODE MYSQL; /* another h2 way to set mode */
CREATE SCHEMA IF NOT EXISTS "public"; /* required due to issue with flyway --> https://stackoverflow.com/a/19115417/1224584*/
Updated application-test.yaml to include the schema name public:
flyway:
schemas: public
Ensure the test specified the profile: #ActiveProfiles("test")

Answer 3

I have tried similiar approaches to get this to work, but spring does not take the spring.datasource.url=jdbc:h2:mem:testdb;MODE=MYSQL from my test-application.properties
Did you try to append this parameters instead of rewriting the existing ones?
spring.datasource.url=jdbc:h2:mem:testdb;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE;MODE=MYSQL
All other settings from my test-application.properties have been read successfully.
I thought that file should be named application-test.properties.

Answer 4

I was able to run it with this config:
# for integration tests use H2 in MySQL mode
spring.datasource.url=jdbc:h2:mem:testdb;DATABASE_TO_LOWER=TRUE;MODE=MySQL;
spring.jpa.database-platform=org.hibernate.dialect.MariaDBDialect
The main trick here is to force Hibernate to generate SQL scripts for MariaDB dialect because otherwise Hibernate tries to use H2 dialect while H2 is already waiting for MySQL like commands.
Also I tried to use more fresh MariaDB103Dialect for MariaDB 10.3 but it doesn't worked properly.

Answer 5

You need to set MYSQL mode on h2 and disable replacing of datasource url for embedded database:
Modify application-test.yaml
spring:
datasource:
url: jdbc:h2:mem:testdb;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=false;MODE=MYSQL
test:
database:
replace: NONE