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.
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.
Can we use multiple datasources with jdbi.
Will the configuration will be same as what we have with JPA : https://www.baeldung.com/spring-data-jpa-multiple-databases
So, in first, you can set more than one database for your application with JDBI, exactely like JDBC. You just have to set them inside your application.properties.
Second, if you want to use JDBI, you'll use a kind of classical queries, instead of a dialect for JPA/hibernate inside repositories.
You can read this discussion to compare them : Benchmarking spring data vs JDBI in select from postgres Database
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.
I am new to Redis and trying to implement change Postgres DB into the Redis DB. Current implementation we've used Spring Data JPA (Entity Classes + JPA Repository). Now I wanted to use Spring Data Redis and backend as Redis In Memory DB.
Could you please suggest what changes do I need to make in all Entity classes ? How the persistence will happen ? Do I need to make any changes in Join Table etc.. where I have #ManyToOne and #ManyToMany relationship.
Redis a nosql solution so you will not get the befit of foreign keys as in a RDBMS. You will instead need to convert you data into data-structures supported by Redis. https://redis.io/topics/data-types-intro
I am working on a project in which we have two Database one is Microsoft SQL server and other is DB2. I have to insert many sets of data in both the table, if any of the set of SQL query fails then it will rollback in both the database, How to do transaction management in spring with JDBCTemplate.
<bean> property has primary attribute:
<bean primary="true|false"/>
If you are getting in editor remove versions from xsd.