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I have set up a JPA Database connection for my Eclipse Java project to a PostGreSQL database. I was wondering if there was a way to create a class for one of the tables without doing everything by hand.
Yes,you can use hibernate reverse engineering. Pretty much with some simple set up, it will generate java pojo class for you.
See:
http://javafws.blogspot.com/2013/04/generate-hbm-files-pojo-classes-in-eclipse.html
and
http://www.mkyong.com/hibernate/how-to-generate-code-with-hibernate-tools/
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The following shows one entity, where the same product (same pid) is given a rating by two different users (different uid). I want to get the latest data about average_stars (namely the second column data), which is 4.50. I used a MySQL command findTopByProduct, which shows me the older average_stars instead, namely 4.00. I tried findBottomByProduct, which turns out to be non-existent. I will really appreciate anyone who can help me with this simple question. Thanks in advance!
I have found the answer: findTopByProductOrderByPruidDesc
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Elasticsearch version 7.0.1
PostgreSQL 10.9
openJDK 11
I want to get data using full text search of Elasticsearch from PostgreSQL database,how can I do it , anyone know about Elasticsearch? have any ideas for that?
You can't do this directly;
You can try using logStash to inject your PostgreSQL data to Elastisearch and then ask Elasticsaearch directly.
Here you can find full solution; https://medium.com/#erangadulshan.14/pushing-relational-data-to-elasticsearch-using-logstash-jdbc-input-plugin-48af81ed1000
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I want to port my database from MySQL to Oracle 12c. What is the best way to do that?
My project is written in Java.
The Best way to start with is Oracle's utility which you can found Here.
But then you also need to verify data types of your fields because it creates problem with some complex data types like BLOB etc
Oracle has provide the documentation for migration.
http://www.oracle.com/technetwork/database/migration/mysql-093223.html
For migrating application, If you are using any ORM then you have start working on the configurations first.
If your application has a lot of SQLs/procedures then you need help from your DBA team. They can migrate data as well as procedures etc.
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I'm getting data as an Access file.
My application uses PostgreSQL/Java. I'd like to convert the Access database to PostgreSQL.
can any one help me to code this
I doubt there is any simple automatic method. You will have to create ddl statements to make the tables in postgresql (not sure if you can export ddl from access), export the data from access to a csv, and then use postgresql copy from command to populate the tables.
Or you could consider trying this tool:
http://docman.sourceforge.net/home_html/projects/sql/exportSQL3.txt
but it looks like a dev version, it may not be mature.
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I want make a generic hibernate API which will create mapping class from hbm.xml and use in generic select method.
Please help me..
Thanks
Hibernate tools (hbm2java) allows you to do this. Read the 5.4.2. POJO java code exporter section or look at the screenshot below.
(Screenshot from Hibernate Tools Reference Guide [pdf])