request for clarification about the 'length' attribute

simonm · **Joined:** Mon Jun 01, 2009 11:00 am **Posts:** 4

Hi folks,

what is the 'length' attribute of the column property in the hbm-files expected to indicate?

According to the hibernate reference manual:

"length number column length", I'd expect to specify the column's max length using that attribute, i.e., Hibernate automatically taking care of the according string not exceeding the specified length.

However, using the following mapping:

Code:

<property name="code" type="string">
  <column name="CODE" length="50" />
</property>

.. and applying a string > 50 chars and saving the object ends up in the following error:

Quote:

java.sql.SQLException: ORA-12899: value too large for column "CATEGORY"."CODE" (actual: 93, maximum: 50)

at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:331)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:288)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:743)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:216)
at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:955)
at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:10580)
at org.apache.commons.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:294)
at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:48)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:242)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:235)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:140)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:561)
...

Am I misunderstanding the meaning of the attribute?
If so, is there any other Hibernate 'out-of-the-box' functionality that alllows automated truncation of strings?

Thanks in advance.

Regards,
Simon

simonm · **Joined:** Mon Jun 01, 2009 11:00 am **Posts:** 4

... any hints / comments / ideas?

Thank you very much!

Regards,
Simon

parag.gajbhiye · **Posted:** Tue Jun 09, 2009 5:04 am

HI Simonm,

Actually, length specify the lengh of the column of the perticular column,
if u specify the length=50 ,then it will accept only 50 characters......
and if you not specify the length then hibernate intrnally specifies the length 255 for string type;;;(sorry for my english)

ok..

<property name="name" type=String >
<column name="name" length="2"/> ---------------accept only 2 char.
</property>

<property name="name" type="string" >
<column name="name" /> ---------------accept 255 char.
</property>

<property name="name" type="text" >
<column name="name" length="2"/> ---------------accept only 2 char.
</property>

<property name="name" type="text" >
<column name="name"/> ---------------accept 65555 char.
</property>

simonm · **Joined:** Mon Jun 01, 2009 11:00 am **Posts:** 4

Hi parag,

thanks for your reply, that was how I expected the behaviour as well.

However, I do specifiy a maximum length of 50 characters, but Hibernate does not care about this setting at all; it simply accepts any length of characters, resulting in the JDBC-error mentioned above afterwards.

Am I missing any setting which makes Hibernate aware of my length-specification, or are my expectations basically wrong?

Thanks a lot!

Regards,
Simon

parag.gajbhiye · **Posted:** Wed Jun 10, 2009 4:45 am

HI,,,,
If u give the 'name' more than 50 char ,,then it causes an error.

like

in ur application

public static void main(String args[])
{
public String name;

Congiuration -------
sessionFcatory-------
transaction-------

name="dasdhashdj"; less than 50 char ,hibernate accepts

but when u type name="sssssssssssssseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee "

more than 50 char..it reject and causes an error....

}

understand!!!!!!
hibernate doesnt check what is at name="------" ......it check when u save in the database..if more than 50 char then mysql cause the problem..so hibernate cause the error

if not satisfied then ask me again......(once again sorry for my english)

simonm · **Joined:** Mon Jun 01, 2009 11:00 am **Posts:** 4

Hi,

ok, that makes things clearer now! I thought it would automatically remove the overhanging characters. I do not quite get the sense of indicated the length yourself, because the JDBC-driver would throw in case there are to many characters.

Of course, there should be a limitation in characters in the UI or other layers already, but since Hibernate is the last 'point to check' it would be great if I could make it remove the characters that are too much automatically, just to make sure ...

Any ideas how to achieve this? I do not want to intercept inserting/updating on my own ...

Thanks!

Regards,
Simon

parag.gajbhiye · **Posted:** Wed Jun 10, 2009 5:13 am

hi simonm,,no idea about this.but u can restrict this in GUI...or in application.