1. Omaha Java Users Group
March 18, 2008
Corey A. Spitzer

2. The Context
• J2EE (with Spring)
• OOP
• SQL Relational Database

3. What is iBATIS?
Object Oriented
Object
Logic / DAO
iBATIS Database
Code
Query
Relational

4. A More Detailed Look
calls
Code SqlMapClient
insert()
loads update() calls
delete()
query()
SQL Maps javax.sql.DataSource
Queries
Result Maps
Magic
Magic
Database

5. The SQL Map Anatomy Code
calls SqlMapClient
loads calls
SQL Maps DataSource
<sqlMap namespace="myNamespace"> Magic
Magic
<resultMap id="myClass" class="full.package.MyClass">
Database
<result property="foo" column="col1"/>
<result property="bar" column="col2"/>
...
</resultMap>
...
<!-- ===================================================== -->
<sql id="myQuery" resultMap="myClass">
SELECT col1, col2 FROM table1
</sql>
...
</sqlMap>

6. The Code Anatomy Code
calls SqlMapClient
loads calls
import java.sql.SQLException;
SQL Maps DataSource
import com.ibatis.sqlmap.client.SqlMapClient;
... Magic
Magic
public class MyDAO
Database
{
private SqlMapClient myDB;
public void frobnicate(MyObject someObject) throws SQLException
{
List<MyClass> list = myDB.queryForList("myQuery");
Foo myFoo = (Foo)myDB.queryForObject("getFooByID", 1337);
myDB.update("myQuery3");
myDB.insert("myQuery4", someObject);
...
}
...
}

7. Any Questions so far?
calls
Code SqlMapClient
insert()
loads update() calls
delete()
query()
SQL Maps javax.sql.DataSource
Queries
Result Maps
Magic
Magic
Database

8. Implicit Mapping
<sqlMap namespace="myNamespace">
<resultMap id="myClass" class="full.package.Class">
<result property="foo" column="col1"/>
<result property="bar" column="col2"/>
...
</resultMap>
...
<!-- ===================================================== -->
<sql id="myQuery" resultClass="full.package.Class">
SELECT col1 as foo, col2 as bar FROM table1
</sql>
...
</sqlMap>

9. Inheritance
Object Oriented Code Relational Database
Fruit fruits
id - int id - mediumint(7), PK
dateBought - long date_bought - int(11)
type - enum('a', 'o')
apples
Apple Orange fruit_id - mediumint(7), FK
worm_count - decimal(4,1)
wormCount - float bioengineered - boolean
oranges
fruit_id - mediumint(7), FK
bioengineered - bool

10. Complex Members
Object Oriented Code Relational Database
Cake cakes
id - int id - mediumint(7), PK
flavor - String flavor - enum('chocolate', ...)
toppings - List<CakeTopping>
cakes_to_toppings
cake_id - mediumint(7), FK
topping_id - mediumint(7), FK
CakeTopping
id - int
name - String cake_toppings
containsHFCS - boolean
id - mediumint(7), PK
name - varchar(20)
contains_hfcs - bool

11. Parameters & Dynamic Queries

12. Custom Type Handlers
public class YesNoBoolTypeHandler implements TypeHandlerCallback {
public Object getResult(ResultGetter getter) throws SQLException {
if ("Y".equalsIgnoreCase(getter.getString())) {
return new Boolean (true);
} else if ("N".equalsIgnoreCase(getter.getString())) {
return new Boolean (false);
} else {
throw new SQLException();
}
}
public void setParameter(ParameterSetter setter, Object parameter)
throws SQLException {
if (((Boolean)parameter).booleanValue()) setter.setString("Y");
else setter.setString("N");
}
public Object valueOf(String s) {
return new Boolean ("Y".equalsIgnoreCase(s));
}
}

13. Custom Type Handlers
<resultMap id="myClass" class="my.package.MyClass">
...
<result property="foo" column="bar"
typeHandler="some.package.YesNoBoolTypeHandler"/>
...
</resultMap>
<insert id="myQuery" resultMap="myClass"
parameterClass="my.package.MyClass">
INSERT INTO table1 SET bar =
#foo,handler=some.package.YesNoBoolTypeHandler#
</insert>

14. Paging / Selecting a Range

15. selectKey
<insert id="addForumThread" parameterClass="java.util.HashMap">
INSERT INTO forum_threads SET
forum_id = #forumID#,
title = #title#,
created_time = #createdTime#,
last_updated_time = #createdTime#,
<selectKey resultClass="int">
SELECT MAX(id) FROM forum_threads
</selectKey>
</insert>

16. Caching Features
<cacheModel id="fooCache" type="{LRU|MEMORY|FIFO|OSCACHE}"
readOnly="{true|false}" serialize="{true|false}">
<flushInterval hours="24"/>
<flushOnExecute statement="insertFoo"/>
<flushOnExecute statement="updateFoo"/>
<flushOnExecute statement="deleteFoo"/>
<property name="size" value="1000"/>
</cacheModel>
<select id="getFoo" cacheModel="fooCache">
SELECT * FROM bar WHERE id = #value#
</select>
<insert id="insertFoo">
INSERT INTO bar SET ...
</insert>
...

17. Transactions
public updateItemDescription(String itemId, String newDescription)
throws SQLException
{
try
{
sqlMap.startTransaction();
Item item = (Item)
sqlMap.queryForObject("getItem", itemId);
item.setDescription (newDescription);
sqlMap.update("updateItem", item);
sqlMap.commitTransaction();
}
finally
{
sqlMap.endTransaction();
}
}

18. What About Hibernate?
iBATIS Hibernate
• Separation of code and SQL • SQL alongside code
• Simpler configuration and setup*
• Total control over SQL queries • Cross-DB query language (HQL)
• Shallow learning curve • ???
• Handles application complexities • Works very well when data model
better** closely resembles object model**
**No Fluff Just Stuff's Mark Richards' two cents:
http://www.nofluffjuststuff.com/media.jsp?mediaId=27
*Source: http://www.devx.com/Java/Article/31481/0/page/1

19. Who is Using iBatis?
• CNet.com
• MySpace.com
• OfficeMax.com
• JPMorganChase.com
• 1up.com
• PowerSentry.com
(and more)
Source: http://www.ociweb.com/mark/programming/iBATIS.html#WhoUses

20. Now What?
http://ibatis.apache.org