Hibernate: A simple example

1. First, you need to create an xml file to specify the database parameters that you are going to use. Database parameters may include: the database driver, user name and password to access the database.
2. Then you should create a persistent class to represent the database table. One member variable for each table column.Also, you are required to write get and set methods for all of the member variable.
3. Then you need to write another XML file to map table columns to class variables.
4. Finally, you need to write the code to make use of the persistent class to store and/or retrieve data from the table.

Examples

1. XML file (hibernate.cfg.xml) to specify the database parameters:
   

   com.mysql.jdbc.Driver
   jdbc:mysql://localhost/hibernatetutorial
   root

   10
   true
   org.hibernate.dialect.MySQLDialect
   update
   

   I think you know how to write a class with get and set methods

   XML file to map table columns to class variables.
   

   SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();

   session =sessionFactory.openSession();

   //Create new instance of Contact and set values in it by reading them from form object, Contact is the persistent class here

   System.out.println(“Inserting Record”);
   Contact contact = new Contact();
   contact.setFirstName(“XYZ”);
   session.flush();
   session.close();

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Post Data:2011-09-19 21:45:24

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What is Hibernate? What does it mean to J2EE developers
Hibernate is an open source free Java package that provides easy and efficient ways to deal with relational databases. Hibernate gives the abstraction that your databases contain just objects rather than tables. You manipulate objects to insert data or to get data from the database tables. You do not write or use SQL statements for the purpose. Though you need to map table columns to object variables.

Is Hibernate appropriate in all situations or for all?

No.
If you are already comfortable working with relational databases and know how to craft the perfect SQL query to interact with an enterprise database, Hibernate may not be the right way to go. You may better try to use iBATIS. In some situations, a full blown EJB architecture is more appropriate.

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Post Data:2008-06-26 06:44:21

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Check the following article:

• Open-plan offices are making workers sick, say Australian scientists
• I think, it depends on the context, type of employee, nature of work, intention of the management

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CREATE PROCEDURE p25 (OUT return_val INT)BEGINDECLARE a,b INT;DECLARE cur_1 CURSOR FOR SELECT s1 FROM t;DECLARE CONTINUE HANDLER FOR NOT FOUND < --SET b = 1; <--OPEN cur_1;REPEATFETCH cur_1 INTO a;UNTIL b = 1END REPEAT;CLOSE cur_1;SET return_val = a;END;//

DELIMITER $$ DROP PROCEDURE IF EXISTS WhileLoopProc$$ CREATE PROCEDURE WhileLoopProc()       BEGIN               DECLARE x  INT;               DECLARE str  VARCHAR(255);               SET x = 1;               SET str =  '';               WHILE x  < = 5 DO                           SET  str = CONCAT(str,x,',');                           SET  x = x + 1;                END WHILE;               SELECT str;       END$$   DELIMITER ;

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• Optimization
• MySQL Load Balancher
• MySQL Replication
• MySQL Cluster
• Stored Procedures and Functions
• MySQL High Availability and Scalability

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• MySQL Reference Manual

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