how to get correct encoding for index of solr?

Question

I am trying to make search unsing solr on my database. below is the snippet that create my solr index

<?xml version="1.0" encoding="UTF-8"?>
<dataConfig>
  <dataSource batchSize="-1" convertType="true" driver="com.mysql.jdbc.Driver" password="" url="jdbc:mysql://localhost/mysolrdb" user="root"/>
  <document name="items">
    <entity name="root" pk="id" preImportDeleteQuery="data_source:1" query="select id,headline as title,body,date as datecreated from article" transformer="TemplateTransformer" deltaImportQuery="select id,headline as title,body from article where id='${dataimporter.delta.id}'" deltaQuery="select id from article where last_update_time > '${dataimporter.last_index_time}'">

      <field column="data_source" template="1"/>
      <field column="data_source_type" template="Jdbc"/>
      <field column="data_source_name" template="elpis_syndigate"/>
    </entity>
  </document>
</dataConfig>

and the table in mysql is

show create table article;
 CREATE TABLE `article` (
  `id` int(255) NOT NULL,
  ..other fields
) ENGINE=MyISAM DEFAULT CHARSET=utf8

now, some of the articles are written in non-english characters (Arabic). and solr is getting these articles as rubbish characters. although when i search for something i got a result, but it is in un-readable characters.
anyone faced the same case? how can i fix it?