Solved

How to execute SQL statements from txt file using Hibernate

Posted on 2009-05-05
3
2,601 Views
Last Modified: 2013-11-23
Hello,

I have a program, the user load a txt file that contain a list of SQL statements. I would like to know how can execute these SQL statements using Hibernate taking as a starting point that the user will load a list of Conventional SQL statements.

How can I do that?

Thank you for help.
0
Comment
Question by:Fionageo80
  • 2
3 Comments
 
LVL 8

Expert Comment

by:ozlevanon
ID: 24304033
There is some information missing - which way do the commands appear in the file? Should something be done with their result? etc.
The following code is assuming there is one SQL command per line (i.e. there is a newline character between each command) and that these are not query statement for which the program should analyze the result.

Note that in this example the session is closed after all the commands, but you can close it and open a new one after each command.
			SessionFactory sessionFactory = null; // init this the way you usually do.

			FileReader fr = new FileReader(args[0]);

			BufferedReader br = new BufferedReader(fr);

			Session session = sessionFactory.getCurrentSession();

			session.beginTransaction();

			while (true)

			{

				String sql = br.readLine();

				if (sql == null)

				{

					break;

				}

				try

				{

					int result = session.createSQLQuery(sql).executeUpdate();

					System.out.printf("Got result %d from '%s'\n", result, sql);

				}

				catch (Exception e)

				{

					System.err.printf("Error executing '%s'\n", sql);

				}

			}

			session.getTransaction().commit();

			fr.close();

Open in new window

0
 

Author Comment

by:Fionageo80
ID: 24304184
Thank you for your quick reply.

Actually I have to use Hibernate.
The SQL statements are listed as you can see below, one statement after the other.

I have a EntityBean.java  that gets the EntityManager.

**** I want to know if I can execute directly these statements using entityManager.createNativeQuery? or createQuery? *****

Yes, I have to post process the result of those queries.

Thank you!


select * from user a where status= 1 and not exists(select * from detail where id= a.id)

select * from user a where status <> 1 and exists(select * from detail where id= a.id)

Open in new window

0
 
LVL 8

Accepted Solution

by:
ozlevanon earned 500 total points
ID: 24304296
This example is for hibernate, but uses a SessionFactory which creates a session.
If you're using EntityManager you should call createNativeQuery for SQL queries, whereas createQuery is for HQL (hibernate query language) statements.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Java functions are among the best things for programmers to work with as Java sites can be very easy to read and prepare. Java especially simplifies many processes in the coding industry as it helps integrate many forms of technology and different d…
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:
This video teaches viewers about errors in exception handling.

910 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now