[jira] Created: (IBATIS-215) BSF for dynamic queries

["Paul Benedict (JIRA)" <ib...@incubator.apache.org>]

BSF for dynamic queries
-----------------------

         Key: IBATIS-215
         URL: http://issues.apache.org/jira/browse/IBATIS-215
     Project: iBatis for Java
        Type: New Feature
  Components: SQL Maps  
    Reporter: Paul Benedict


While the list of tags to form dynamic queries is suitable, they are limiting because they stop the "dreamer from dreaming." More complex logic cannot be addressed without creating a barrage of new tags.

I propose a new tag called <script> (or something similar) which is backed by the Apache Bean Scripting Framework. The parameter map passed in to the <statement> should load it into the scripting Interpreter object and expose it for the <script> tag so that dynamic Java or JavaScript can return boolean parameters. Obviously there is a performance hit for this and the previous tags would be much simpler for common boolean operations, but the sky is the limit when it comes to what you can compare inside the script.

Example:
<select id="dynamicGetAccountList" cacheModel="resultMap="account-result" >
    select * from ACCOUNT
   <script><expression>obj.id != null && obj.id > 0 && obj.lastName.startsWith("B")"</expression>
     where ACC_ID = #id# and
    ACC_NAME = #lastName#
  </script>
  order by ACC_LAST_NAME
</select>

If BSF is not suitable, please look into OGNL which is popular within Apache Tapestry and is a very good alternative.

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