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How to execute SQL statements from txt file using Hibernate

Posted on 2009-05-05
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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.
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Question by:Fionageo80
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3 Comments
 
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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();

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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)

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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.
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