What is different between Hibernate and iBatis?

Questions by siva2baba   answers by siva2baba

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vdurgesh

  • Jun 23rd, 2008
 

1. Hibernate works well when you control the data model,
iBatis works well when you need to intergate with an existing database,

2. With IBatis you will get full control on SQL but hibenate deals with relationships of tables.

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alkumar2000

  • Aug 13th, 2008
 

Ibatis is something in between Hibernate and JDBC.
Hibernate provides a way to represent database rows as objects so that developers can easily call create update delete methods on them where Ibatis helps developers in mapping SQL queries in the form of XML files these queries can be mapped to a name and parameters can be passed to them. Now these queries can be accesed as Java objects and can be called by passing parameters.

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These are the few questions that continuously get asked in most of forums.


What’s really difference between two and really more importantly when should
I use one over the other. Its pretty interesting question because there are
major differences between iBatis and Hibernate.


Within in the java persistence there is no one size, fits all solution. So,
in this case Hibernate which is a de facto standard is used in lot of places.


Let us consider a scenario where Hibernate work great for initial model. Now
Suddenly if you are using stored procedures, well we can do it in Hibernate but
its little difficult; ok we map those, all of sudden we got some reporting type
of queries, those don’t have keys have group bys; with some difficulty here we
can use name queries and stuff like that, but now starts getting more
complicated, we have complex joins, yes you can do in hibernate, but we can’t do
with average developer. We have SQL that just doesn’t work.


So these are some of the complexities. One of the other things I find is, if
am looking at an application that does not work very well with an ORM, aside
from these considerations of using stored procedures, already using SQL, complex
joins. In other words, Hibernate works very well if your data model is well in
sync with object model, because ORM solutions like Hibernate map object to
tables. However, let’s suppose data model is not in sync with object model, in
this case you have do lot of additional coding and complexities are entering
into your application, start coming the beyond the benefits of ORM. So, again
all of sudden you are noticing that the flow is gone; our application is
becoming very very complex and developers can’t maintain the code.


This is where the model starts breaking down. One size does not fit all. So
this is where I like to use iBatis; as the alternative solution for these type
of situations, iBatis maps results sets to objects, so no need to care about
table structures. This works very well for stored procedures, works very well
for reporting applications, etc,.


Now the question is , does it work well for simple CRUD applications? Well,
it works because what we have to write is sql. Then why not use Hibernate for
that?


You can start see Some of the decision criteria that comes into play. So one
of the other follow on questions that typically get is , can I use both? That’s
really interesting question! because the answer is sure.


But, such a thing will never ever exists is java persistence world. However
we can kind of use both to create this little hybrid. So think of this kind
scenario, we have very large application where Hibernate is working very well
for it, but we have a reporting piece that just is a real nag , its query only ,
so we can do is, we can use iBatis to pull up the queries for reporting piece
and still use Hibernate for all the operational stuff and updates. This model
actually works well, it doesn’t break the transactional model, and it doesn’t
affect any of the primary & secondary caches with a Hibernate. It’s a good
solution.


Use iBatis if



  • You want to create your own SQL's and are willing to maintain them

  • your environment is driven by relational data model

  • you have to work existing and complex schema's


Use Hibernate if



  • your environment is driven by object model and wants generates SQL
    automatically


The message is,



  • One size does not fit all the java persistence and the important to know
    there are other solutions besides the traditional ORMs, and that would be
    iBatis.

  • Both the solutions work well, given their specific domain.

  • Look for the opportunity where you can use both.

uday.dandu

  • Jul 27th, 2010
 

In iBatis Java objects are mapped to the result sets. IBatis only maps the Java bean properties to database fields, and it fetches the database results in the form of Java beans based on configuration. In Hibernate Java objects are mapped to the database tables.

iBATIS maps Java Objects to the results of SQL Queries, whereas Hibernate maps Java Objects directly to database tables, traditional Object-Relational Mapping. The benefits of Hibernate are that it automatically generates all the SQL for your and the cache invalidation can be more fine grained. iBATIS is more flexible especially if we are a strong SQL query writer. We have control over exactly how the SQL queries are written.

iBATIS uses Data Mapper Pattern whereas Hibernate uses Active Record Pattern

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