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Need help on below
I did small task using spring batch with Cassandra database
Task : Reading data from Cassandra database and writing to file
Here when I check Cassandra data base Meta data tables are not getting created
Is spring batch will not crate meta data tables in Cassandra db ?
In Spring, schema creation is not enabled by default so no tables are created.
You didn't provide sufficient information in your question so it's hard to know whether this applies to your case. In any case, you need to explicitly configure schema creation, for example:
spring.data.cassandra.schema-action=CREATE_IF_NOT_EXISTS
For future reference, you need to provide minimal sample code which replicates the issue. Cheers!
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I want to do CRUD operations on JSON file with JPA Repository.
I tried with JSON Populators as described by Baeldung.
But it is giving me org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory'.
Is there any other way I can do JPA operations without specifying any database with just on Json File?
Is there any Other way I can do JPA operation without specifying any database with just on Json File?
No.
JPA claims to be data source agnostic, but the only relevant implementations that actually exists are for relational databases only.
Repository populators are tools to load data from a resource and then use a repository to write them to a database.
They are typically used to initialise databases.
You can use different repositories (JPA, Mongo ...) to write to different types of database.
You could write your own Spring Data module reading and writing data to and from a JSON file, but no such implementation currently esxists as far as I know and it is probably not worth the effort for almost all scenarios.
Now if you're using Java, there is none, but if you're using Javascript, you can use lowdb, a JSON database.
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I have thousands of table in the database that needs to convert in hibernate java entities.What are the possible ways to do this task?
Use Eclipse Dali Java Persistence Tools refer to this link on how to generate the entities.
I would write a simple Java program to read the database meta data of the tables and column names in the tables. It then could write out a Java class file per each table using the column names for the class variables.
A sample program that reads the DB meta information is here. It could quickly be adapted to reading in the DB tables and writing out the Java classes.
Sample Java DB Meta Data Program
A better set of examples for the generic JDBC Metadata API is here
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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 have started learning spring, please help me about how to read data from excel and save into database using spring and hibernate, please show me
This question is not related to spring with hibernate.
To read data from excel you need to use a library like Apache POI.
Once you have the data in memory save them to the db using Spring with Hibernate as always (as you already tried with simple examples I hope).
Probably in 80% of the use cases it is possible (and actually easier as no implementation is required) to export the Excel sheet as CSV and import it using common database tools. There are a lot of infos in the internet how to import CSV, e.g. using COPY in Postgres or LOAD DATA in MySQL.
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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.