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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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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 have a question.
I want to parse XML file using SAX or JAXB and save the parsed file into a database using java, any help please.
Even though you should research the topic first, I am giving you a starting point. Basically you'd use unmarshalling to create a java object from an XML (see http://lstierneyltd.com/blog/development/examples/java-to-xml-xml-to-java-marshalling-and-unmarshalling/). Then you could use some i.e. Apache Cayenne or Hibernate to store the object to a database.
I would recommend to refrain from putting the XML to a relational database itself if you expect significant amounts of data.
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I am novice in JAVA and using Oracle SQL 11g, I have a requirement on my JAVA program to export data from Oracle Database in excel format.
I've searching in youtube but i can't find a way.
You can use Apache POI to export data to excel format.
You can use CVS format, witch can be imported in Excel.
1. Select data from DB.
2. Convert DTOs to CVS string.
3. Save them in file.
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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.