Hi all,
following scenario:
I'va an object Instrument. It references an another object option.
create table instrument (
id int not null auto_increment primary key,
internalNumber varchar(12) not null unique
);
create table option (
instrument_id int not null auto_increment primary key,
name varchar(12) not null unique
constraint instrument_option_fk_01 foreign key (instrument_id) references instrument (id) ON DELETE CASCADE ON UPDATE CASCADE
);
An option object can not be exist without corresponding instrument. That means, deleting of an instrument object from the data base implies the need of deletion of the referenced option (if not null) before.
Deleting and update of instruments work well. But inserting a new instrument throws a lot of questions:
1. first I tried to call multiple inserts within an insert element in mapping file. The hibernate doesn't accept this.
org.springframework.jdbc.BadSqlGrammarException: SqlMapClient operation; bad SQL grammar []; nested exception is com.ibatis.common.jdbc.exception.NestedSQLException:
--- The error occurred in Instrument.xml.
--- The error occurred while applying a parameter map.
--- Check the instrument-InlineParameterMap.
--- Check the statement (update failed).
--- Cause: java.sql.SQLException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '; INSERT INTO option(instrument_id, name at line 1
2. To solve this problem, I wrote two insert fragments. One for instrument and one for option. In my DAO implementaiotn then call they in right order (first inserting instrument and then option using id of the stored instrument.
My Question is:
how does iBATIS handle the inserting of coposed objects? If my instrument is referenced by N other objects, shoud I take care of inserting all of them? Why are delete and insert not symmetric? During delete is done by just one step, why does insert several steps?
I'm using iBATIS 2.1.5 in combination with spring 1.2.x.
Thanks in advance and best regards
Reza
