I have created two spring boot microservices for experimenting purposes, both use hsqldb. Is there a way to see the hsqldb details like what is the name of the db that spring boot created, username, password, what tables are there in each one and to query those tables.
You can use the built-in SQL functions and INFORMATION_SCHEMA views in HSQLDB to check these properties. See the Guide http://hsqldb.org/doc/2.0/guide/
But the quick and easy way is to use a file: database connection and check the *.script file of the database, which contains SQL statements that set the properties and create the tables.
Related
I created user in oracle database and I am trying to create session but I find many ways in spring boot so what is the easy way if I want to create classe connections using the Username and Password ?
You can jdbc template, spring data JDBC or spring data JPA, well depending on your use case.
If your data model is quite complex, you should avoid using the JDBC template as you will need to write prepared statements which can be cumbersome. JPA will allow you to use object-oriented programming principles and also will help you map the entities to your database columns.
For example, if you are going to use spring data JPA, you need to set the application properties as follows:
spring.datasource.type=oracle.oracleucp.jdbc.UCPDataSource
spring.datasource.oracleucp.connection-factory-class-name=oracle.jdbc.pool.OracleDataSource
spring.datasource.oracleucp.sql-for-validate-connection=select * from dual
spring.datasource.oracleucp.connection-pool-name=UcpPoolBooks
spring.datasource.oracleucp.initial-pool-size=5
spring.datasource.oracleucp.min-pool-size=5
spring.datasource.oracleucp.max-pool-size=10
This would behind the scene create an Oracle Datasource. In this example, we are using Oracle Universal Connection Pooling. You can also use HikariCP which is quite popular.
check this out
If you want to use UCP with above properties then you must have SpringBoot version higher than 2.4.0.
Check out the Spring Boot code sample on GitHub.
I am trying to integrate flyway to my existing Spring boot app. My requirement is, the default table created by flyway needs to be created on different DB schema and my applications actual table migration must happen on different schema. Reason being, no addition table must be created on the applications DB schema. Currently we are using Mysql
We had a Spring Boot app with the flyway configuration in application.properties file for different environments:
flyway.enabled=true
flyway.url=jdbc:postgresql://localhost:5432/finance
flyway.schemas=user
flyway.password=password
flyway.user=postgres
flyway.baseline-on-migrate=true
We had the application-dev.properties, application-local.properties and application-aws.properties with the configuration specific to the environment
Flyway provides a property flyway.schemas. When the flyway.schemas property is set (multi-schema mode), the schema history table is placed in the first schema of the list.
https://flywaydb.org/documentation/commandline/migrate.html
ex:flyway.schemas=schema1,schema2,schema3
How can I generate an entity(and a database table) in a different schema other than the default public schema for an existing Jhipster(4.6.2) project generated with spring boot and AngularJS as the technology stack. [Database - Postgresql]
I am very interested if it is possible. Otherwise one simple way to reach that: you could try to generate the entity using the jhipster command jhipster entity <entityName> --[options] see for more details.
And customize your application to use multiple databases by following this excellent article: https://www.baeldung.com/spring-data-jpa-multiple-databases
I have A requirement where the current schema to be used is stored in db table;(schema_a or schema_b).
The application is loaded with default schema
spring.jpa.properties.hibernate.default_schema=schema_a
Now when the data in table is updated to B I want to consider all jpa query to use schema_b without any down time at server.
Your question is not clear enough to provide some code to your question, but you can catch inspiration from the following articles:
https://spring.io/blog/2007/01/23/dynamic-datasource-routing/
Spring Boot - Change connection dynamically
Am using Mysql database and hibernate in JPA. I have two mysql databases in my project. I want to configure these two databases in configuration class of spring JPA. Already I have configured for one datasource using jpa transaction manager bean. I want to add one more datasource to configure. Please consider below scenario.
Mysql Database db1
-Table 1, Table2, Table3
Mysql Database db2
-Table1, Table2
I want to add jpa configuration for above two sql database. Different connections. Whenever repository interface calls for the particular entity, that database should be get called. Please help anyone on this. Thanks in advance.