How do I extend frm SqlMapClientImpl?

[nilesh]

Does iBatis allow any way of specifying the implementation object for SqlMapClient?

I want to keep iBatis in my framework level package, so that none of my client code will directly call iBatis. This way I could change the OR Mapping implementation without touching any of client code.

Only way I could find out to achieve this --

public class SqlMapProcessor
{
    protected static SqlMapClient sqlMap;
    private static Logger logger = Logger.getLogger(SqlMapProcessor.class);
    private static final String IBATIS_CONFIG = "iBatis_config";
    private static SqlMapProcessor sqlMapProcessor;
   
    private SqlMapProcessor()
    {
        try
        {
            String configFile = System.getProperty(IBATIS_CONFIG);
            initSqlMap(configFile);
        }catch(Exception e)
        {
            logger.error("Error initializing iBatis client " + e);
        }
    }
   
    private void initSqlMap(String configFile)
    throws Exception
    {
        Reader reader = null;
        try
        {
            reader = Resources.getResourceAsReader(configFile);
            sqlMap = SqlMapClientBuilder.buildSqlMapClient(reader);
        }finally
        {
            if(reader!=null)
                reader.close();
        }
    }
   
    public static SqlMapProcessor getInstance()
    {
        if(sqlMapProcessor==null)
            sqlMapProcessor = new SqlMapProcessor();
       
        return sqlMapProcessor;
    }
   
    public Object findByKey(String id, Map data)
    throws Exception
    {
        return sqlMap.queryForObject(id, data);
    }
   
    public Object findLogicalSequence(String id, Map data)
    throws Exception
    {
        Object o = sqlMap.queryForObject(id, data);
        return o==null ? new Integer(1) : o;
    }
   
    public List select(String id, Map data)
    throws Exception
    {
        return sqlMap.queryForList(id, data);
    }
   
    public Object insert(String id, Map data)
    throws Exception
    {
        return sqlMap.insert(id, data);
    }
  
             .......

             .......
}

This way, SqlMapProcessor became a delegator object and i end up defining each method in here which calls SqlMapClient method...

Is there any better way of doing this? Please let me know. Thanks.

[roberto r.]

Have you looked at the iBATIS DAO framework or Spring?

http://www.ibatis.com/common/dao.html
http://www.springframework.org/

Roberto

[Clinton Begin]

1) You shouldn't have a dependency on the SqlMapClientImpl, so it should not be a problem.

2) SqlMapClient is a non-final interface, so you should be able to easily extend it and use your extended interface.

3) Doing either of the above is a poor way to isolate yourself from the persistence framework.  You should use a DAO pattern, either iBATIS DAO, Spring or your own custom DAO implementation.

Cheers,
Clinton

[Brandon Goodin]

THIS IS A USER SUPPORT QUESTION AND IS NOT RELATED TO THE DEVELOPMENT OF THE IBATIS FRAMEWORK. PLEASE POST ON THE USER SUPPORT FORUM IN THE FUTURE.