We are using Spring , tomcat , hibernate and oracle 11.0.2. Is there a way i can switch between 2 oracle instances say(ins1 and ins2) with out restarting the application layer? Is there any setting in hibernate that allows us to do this dynamically?
There is a Spring's HotSwappableTargetSource that allows change beans at runtime. Maybe you can laverage it to your needs. There will still be limitations (such as same database schema in both DBs, ...)
See
http://static.springsource.org/spring/docs/3.0.x/api/org/springframework/aop/target/HotSwappableTargetSource.html
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.
Is Spring Data JDBC v1.1.5 recommended for Oracle Database and Enterprise Applications? Lot of samples around the net based on Open Source RDBMS (H2 or PostgreSQL). We are using Spring Data JDBC in a Spring Boot Microservice Application, facing following problems.
Force to write custom converters for oracle.sql.TIMESTAMP, oracle.sql.TIMESTAMPTZ and oracle.sql.DATE and oracle.sql.ROWID etc..
Can't type cast oracle.sql.ROWID to java.lang.Number
Identity must not be null after save.
Spring Data JDBC is absolutely recommended for Enterprise Applications.
Not so much for use with Oracle.
Since the necessary resources (database & JDBC driver) weren't available in a form that could be easily used in integration tests on public platforms, Oracle isn't included in regular builds.
Therefore it is likely that one encounters issues when working with Oracle.
Some are already known, for others issues in Jira or even PRs are highly appreciated.
I working on a project which uses Spring boot , Spring Data JPA and postgres .There is a problem that can't solve .
When my application start up ,The database not ready yet . It need to add to application at runtime . But I also want to initialize a database using JPA.
just like spring.jpa.hibernate.ddl-auto：create-drop，Unfortunately Initialize a database using JPA will happen at application startup.
My question is that how to delay spring data jpa DDL generation. now we can't add a datasource at application runtime.
I am searching for a long time on net. But no use. The AbstractRoutingDataSource may be not suit for us, because we don't have a datasource at begin .
Please help or try to give some ideas how to achieve this
Thanks in advance
AbstractRoutingDataSource is not useful as it requires pre-configured datasources.
just check this stackoverflow question, it shows how you can add/remove datasources at runtime. While it doesn't support hibernate's delayed ddl creation but you can create database tables in runtime datasources using schema.sql and inserts some constants using data.sql.
I got an app with an existing database that has Oracle only field type (e.g. "binary-float") mapped on the entity class with #ColumnDefinition annotation.
Things runs fine when running the app normally by launching the Application class.
However I can't seem to find a way to write junit tests easily. In another Spring Boot app, I have been using different profile to define a normal datasource that points to Oracle and a junit test datasource that points to the h2 in-memory db. I stayed mostly within JPAQL and common sql standard when using direct sql. Problem is, this scheme doesn't work if the JPA mapping annotation is database specific.
Any suggestions?
I'd like to set the v$session.program Oracle property in order to have information available in the session table. I'm using JPA with a jndi XA datasource created with an oracle-xa-ds.xml deployed in the deploy folder of Jboss, and therefore I haven't access to the constructor of the Connection.
I have access to the Connection object, in JPA 2 using unwrap, in JPA 1 by casting JPA to Hibernate classes, but there are no properties setter (only Client Info properties that are the way to proceed starting JDBC 4.0).
So my question is, using JPA (with Hibernate) using Jboss 4.2 :
Is it possible to configure the v$session.program in the persistence.xml ?
Is it possible to configure the v$session.program in the oracle-ds.xml ?
Is their any other approach to the solution ?
Thank you for any valuable comments and answers !
I had the same Problem today, after much fiddeling and reading documentation finally I had the Eureka moment:
Add following parameter:
<xa-datasource-property name="connectionProperties">v$session.program=YourUniqueName</xa-datasource-property>
Thats all.
I'm pretty sure this must be documented somewhere but here is what we can find in the JBoss wiki:
How To Specify "PROGRAM" Oracle Connection Property
JBoss Version: JBoss 4.0.3 SP1, Oracle DB Version: 10g
To be able to distinguish the JDBC
connections on the Oracle server side,
which are created by different JBoss
instances, Oracle's PROGRAM connection
property might be set within the
Oracle specific JDBC datasource config
file by using the following tags:
<connection-property name="v$session.program">ADistinguishedNameForPROGRAMProperty</connection-property>
i.e.
...
<connection-url>AConnectionURL</connection-url>
<connection-property name="v$session.program">ADistinguishedNameForPROGRAMProperty</connection-property>
<driver-class>oracle.jdbc.OracleDriver</driver-class>
...
That way the DBAs can have proper
granularity in:
AWRs
v$session view
Other tools which are checking/evaluating PROGRAM connection
property