CODEWITHSUNDEEP
javasqlibatis
cedric
cedric

Reputation: 3147

Iterate list of Objects in Ibatis

I have a list of object where I want to iterate and access a particular field in ibatis sql.

Ex. 

public Class Student
{
String id;
String name;
}

I will pass as parameter a List of Student object(List(Student))
and do iteration accessing the id for each object bean. How do I do this?

Upvotes: 8

Views: 47560

Answers (3)

dillip
dillip

Reputation: 1842

Try something like:

<select id="StudentsQry" parameterClass="list">

select * from STUDENTS where 
( id, name ) in 
        <iterate open="(" close=")" conjunction="," >
                ( #[].id# , #[].name# )
        </iterate>

<select>

where id and name are fields of Student class and my parameterClass is List<Student>.

Worked for me.

The sql formed dynamically will look like:

select * from STUDENTS where ( id, name ) in ( (1,'a'), (2,'b') )

Upvotes: 3

chedine
chedine

Reputation: 2374

A simple example.

<select id="selectFewStudents" resultMap="MyMap" parameterClass="list">
    select * from student_table where student_id in
    <iterate open="(" close=")" conjunction=",">
       #[]#
    </iterate>
</select>

Refer iBatis documentation for more info.

As Sylar pointed out, the java equivalent would be 

<select id="selectFewStudents" resultType="MyMap">
  select * from student_table where student_id in
   <foreach item="currentRow" index="rowNum" collection="list" open="(" separator="," close=")">
    #{currentRow}
  </foreach>
</select>

iBatis allows you to variables item and index which you can use inside the loop.

Upvotes: 6

Sylar
Sylar

Reputation: 2333

The foreach-tag is what you are looking for. Example:

<select id="selectPostIn" resultType="domain.blog.Post">
  SELECT *
   FROM POST P
   WHERE ID in
   <foreach item="item" index="index" collection="list" open="(" separator="," close=")">
    #{item}
   </foreach>
</select>

See the user guide for more info, chapter "dynamic sql".

By the way, iBatis is no longer developed and is frozen, it is now called "MyBatis" and the whole developer team moved away from Apache to the new MyBatis home.

Upvotes: 14

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