enter image description hereI'm using Hibernate to Auto Create a Table on pgAdmin.
-The log is not showing any errors
-It is recognizing the existence of the db since i get an error if i delete it
-Im using dll-auto: update
I'm trying to auto create a table using Hibernate on pgadmin. Code is giving no errors but the table is not being created
since you didn't provide any info about your code, I'm considerng that from code point of view every thing is fine. please check below Items:
Do u checking the right data base instance? if you use IntelliJ, use Database panel to check.
you can use below properties to check SQL commands execution in microservice logs:
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.show_sql=true
logging.level.org.hibernate.SQL=DEBUG
logging.level.org.hibernate.type.descriptor.sql.BasicBinder=TRACE
PostgreSQLDialect is deprecated (please refer here)
Please use PostgreSQL82Dialect or PostgreSQL92Dialect based on your postgres version.
spring.jpa.database-platform=org.hibernate.dialect.PostgreSQL82Dialect
spring.jpa.hibernate.ddl-auto=update
spring.datasource.driverClassName=org.postgresql.Driver
spring.datasource.url=jdbc:postgres://localhost:5432/customer
spring.datasource.username=<username>
spring.datasource.password=<password>
Related
I am trying to upgrade the H2 version from 1.4.200 to 2.0.204. BUt, in my view, the indexes are not working properly.
Steps:
Create Entity and Indexes from JPA layer as shown in below image.
SomeEntity.Java example
2. Default values in application.properties:
spring.datasource.url=jdbc:h2:file:./data/testDb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update
spring.jpa.open-in-view=false
spring.h2.console.enabled=true
spring.h2.conso\le.path=/h2
Start the spring-boot application.
Till this step, everything should be fine and index should be created successfully.
Now, restart the service.
Here, H2 service ( especially,"CreateIndex.executeMeta") is trying to create the index (custom Index) again and failed.
Above steps are working fine in older versions (1.4.200 and below).
Anyone faced similar issue or do we have any workaround for this?
Thanks!!
There have been breaking changes in H2 with version 2.0. Some of the changed behavior can be changed back by using the legacy compatibility mode: http://www.h2database.com/html/features.html
Please try setting
spring.datasource.url=jdbc:h2:file:./data/testDb;MODE=LEGACY
If this does not help, you'll probably need wait with the upgrade until a compliant Hibernate version has been released. See e.g.:
https://hibernate.atlassian.net/browse/HHH-14985
https://hibernate.atlassian.net/browse/HHH-15002
I am trying to create a small Spring Boot setup with a h2 database.
Now I have a weird problem, which I can't solve.
If I don't create an data.sql for initial data, the app starts fine and creates my entity tables.
If I create an data.sql for initial data and keep the existing table from previous step, everything works fine.
If I create an data.sql for initial data and remove my existing h2 file, I get the error that it can't import the data, because the table is missing.
How do I tell Spring to create my tables before importing the initial data?
This is covered in the release notes for Spring Boot 2.5:
By default, data.sql scripts are now run before Hibernate is initialized. This aligns the behavior of basic script-based initialization with that of Flyway and Liquibase. If you want to use data.sql to populate a schema created by Hibernate, set spring.jpa.defer-datasource-initialization to true. While mixing database initialization technologies is not recommended, this will also allow you to use a schema.sql script to build upon a Hibernate-created schema before it’s populated via data.sql.
I'm learning Spring boot and I'm trying to create a very simple RESTful API that access an in-memory database and perform CRUD actions.
However, everytime I try to Connect or Test Connection on http://localhost:8080/h2-console, I get this error:
"Database "C:/Users/XXX/test" not found, and IFEXISTS=true, so we cant auto-create it [90146-199] 90146/90146"
https://imgur.com/a/oYgkK1C
I followed EXACTLY the instructions from http://www.springboottutorial.com/spring-boot-crud-rest-service-with-jpa-hibernate. I have tried everything I could find online: using jdbc:h2:mem:test as JDBC URL etc, but none of them worked for me and I'm not sure what am I doing wrong.
I didn't install h2 database from the official website as I read it is not necessary to use the in-memory module (and I still don't know if I should've installed it or not, as there is not a single mention of it online, as far as I checked).
Any thoughts? I'm a beginner when it comes to Spring Boot and I'm really lost. I just want to test CRUD actions and I don't care about the persistence of the DB.
I have provided my application.properties below.
Thank you! :)
# H2
spring.h2.console.enabled=true
spring.h2.console.path=/h2
# Datasource
spring.datasource.url=jdbc:h2:mem:test
spring.datasource.username=user
spring.datasource.password=user
spring.datasource.driver-class-name=org.h2.Driver
Make sure your url in h2-console(refer screenshot below) is same as your 'spring.datasource.url=jdbc:h2:mem:test'.
It worked for me.
UPDATE: Other alternative solution is,
you can avoid setting spring.datasource.url property. Spring will automatically set this default JDBC url for you.
happy learning.. Upvote, if it is sovled your issue.
In your spring application.properties file, set the property
spring.datasource.url=jdbc:h2:~/test
Then restart the application and open http://localhost:8080/h2-console/
Click on Test Connection button, you should see "Test successful".
For the database schema management with spring data/hibernate, setting spring.jpa.hibernate.ddl-auto option doesn't look like a cleaner approach.
Bcoz
1) We are forced to put the credentials of a user that has permission to create and delete in the application.properties.
2) In production, relaying on spring.jpa.hibernate.ddl-auto option could lead to dataloss, if not managed carefully.
So what is the best way out there to handle the database schema management automatically in a spring boot/spring data app?
Any pointers would help.
Thanks
If you want to track each change state of database then you can use flyway
See this link how to maintain database versioning in spring-boot
In production, you should ideally set spring.jpa.hibernate.ddl-auto property as none so that no schema changes are allowed.
For the database schema management with spring data/hibernate, I would suggest you go for Liquibase, it basically is an open source database-independent library for tracking, managing and applying database schema changes.
Every change to Schema is added as a changeset using property file in Liquibase , this is for the new changes.
In order to migrate the existing database structure into Liquibase, it provides you with commands to automatically generate Changesets by reading the current database.
So using this you can generate database schema, add constraints, load data.
More info at : https://www.liquibase.org/ , Why and when Liquibase?
I was using flyway through the CL to migrate my production DB (mySql), while I was using a fixed SQL query to create the DB, tables, etc. in my unit tests, using H2. I'd like now to better integrate flyway and create/delete DB after each unit test.
I have a DB factory and inside its build method I'm using the following code:
flyway.setLocations("filesystem:sql/migrations/common","filesystem:sql/migrations/h2");
flyway.setSchemas("MYSERVER");
flyway.setDataSource(
p.getProperty(DB_URL.getName()),
p.getProperty(USERNAME.getName()),
p.getProperty(PASSWORD.getName()));
flyway.setInitOnMigrate(true);
flyway.migrate();
The migrations seems to apply correctly, as I can see my SQL code from the flyway logs. But when I start using the DB, immediately afterwards, I get TABLE NOT FOUND errors. I'm using h2 as in memory DB with the following URL to initialize my client:
jdbc:h2:mem:MYSERVER;MVCC=true
Do you have any idea on what I might be making wrong?
The problem is your JDBC url.
MYSERVER is the name of the database, not the schema.
The easiest thing to do is to let flyway use the same url, and not set a schema. This way you'll find everything in the public schema of the MYSERVER database.
Having the same issue - after digging around, it appears that the H2 database is being recreated between migration scripts somehow.
You can confirm this happens by putting a SELECT * FROM migrations in the first two migrations - it will succeed in the first and fail in the second.
According to the H2 Documentation, specifying a database name and ;DB_CLOSE_DELAY=-1 option should suffice to allow concurrent and subsequent accesses to the in-memory database, however this is not the case.
Upgrading Flyway from 3.1 to 3.2.1 has fixed the problem.