I have a managed stateless session bean with injected EntityManager em.
What I am trying to do is to have a database table with unique column. Then I run some algorithm which is trying to insert an entity. If entity exists however it will update it or skip it.
I would like to have something like this:
try {
em.persist(cd);
em.flush();
} catch (PersistenceException e) {
// Check if the exception is DatabaseException and ConstraintViolation
// Update instead or skip it
}
Problem is that I am able to catch only PersistenceException
. DatabaseException
is not catched. It is sad because only DatabaseException
has method called getDatabaseErrorCode()
I would like to use to check duplicate entry. I dont understand it because PersistenceException.getCause()
returns DatabaseException
.
So my question is: How do I catch DatabaseException
and check the MySQL error code?
Thank you for any ideas and experiences with this.
I have a suggestion which is I use in my application. We can retrieve the SQLException
from PersistenceException
. After that, try to get sql error code
for SQLException
. If your requirement is to get the sql error code
, your can follow my example;
public void insert(Group group) throws DAOException {
try {
//your operation
em.flush();
logger.debug("insert() method has been successfully finisehd.");
} catch (PersistenceException pe) {
String sqlErroCode = getErrorCode(pe);
// do your operation based on sql errocode
}
}
protected String getErrorCode(RuntimeException e) {
Throwable throwable = e;
while (throwable != null && !(throwable instanceof SQLException)) {
throwable = throwable.getCause();
}
if (throwable instanceof SQLException) {
Properties properties = --> load sql error code form configuration file.
SQLException sqlex = (SQLException) throwable;
String errorCode = properties.getProperty(sqlex.getErrorCode() + "");
return errorCode;
}
return "NONE";
}
Example error code configuration of mysql
mysql_error_code.properties
#MySQL Database
1062=DUPLICATE_KEY_FOUND
1216=CHILD_RECORD_FOUND
1217=PARENT_RECORD_NOT_FOUND
1048=NULL_VALUE_FOUND
1205=RECORD_HAS_BEEN_LOCKED
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