Hello, It is possible that the SQL92 compiler ignores the left-join tags in the jbosscmp-jdbc.xml file. If I do a test with a bean A and parent bean B and in a finder method of bean A I specify with a left-join tag that the fields of bean B should also be read from the database an be put in the read-ahead cache.
It works for the normal compiler. All fields are loaded with just 1 SQL statement. But with the SQL92 compiler the all the fields of bean A are selected from the database and the fields of bean B are then selected from the database with load relation SQL. So with the SQL92 compiler 2 SQL queries are needed. Also the 2 queries needed depends on the read-ahead tags in the relation specification in the jbosscmp-jdbc.xml file. e.g. | <ejb-relation> | <ejb-relation-name>Task-Originator</ejb-relation-name> | <foreign-key-mapping/> | <ejb-relationship-role> | <ejb-relationship-role-name>task-has-originator</ejb-relationship-role-name> | <key-fields/> | <read-ahead> | <strategy>on-find</strategy> | <eager-load-group>lite</eager-load-group> | </read-ahead> | </ejb-relationship-role> | <ejb-relationship-role> | <ejb-relationship-role-name>originator-has-tasks</ejb-relationship-role-name> | <key-fields> | <key-field> | <field-name>key</field-name> | <column-name>originator</column-name> | </key-field> | </key-fields> | </ejb-relationship-role> | </ejb-relation> | T.I.A. Johan View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3870897#3870897 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3870897 ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
