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Forum
8

Optimistic locking: prevent version increment on entity collection attribute

the application (web app), I create the readings in one call and I try to read them in another call. I checked the database and all the entities are created (document and readings) but when I try to get the collection of readings null is returned. I have tried to clear the entity manager in the second
JDO Doc
8

javax.jdo.Transaction

getNontransactionalRead() If true, allows persistent instances to be read without a transaction active. If true, allows persistent instances to be read without a transaction active. Returns: the value ... of low to high are: read-uncommitted read-committed repeatable-read snapshot serializable Parameters
JPA Doc
6

javax.persistence.CacheStoreMode

the behavior when data is read from the database and when data is committed into the database ... /update entity data into cache when read from database and when committed into database. Insert/update entity data into cache when read from database and when committed into database. Forces refresh
JDO Doc
6

setIsolationLevel(level)

to high are: read-uncommitted read-committed repeatable-read snapshot serializable Parameters: level - the transaction isolation level Since: JDO 2.2 See Also: getIsolationLevel() Constants.TX_READ_UNCOMMITTED Constants.TX_READ_COMMITTED Constants.TX_REPEATABLE_READ Constants.TX_SNAPSHOT Constants.TX_SERIALIZABLE
JDO Doc
6

setTransactionIsolationLevel(level)

are: read-uncommitted read-committed repeatable-read snapshot serializable Parameters: level - the transaction isolation level Since: JDO 2.2 See Also: getTransactionIsolationLevel() Constants.TX_READ_UNCOMMITTED Constants.TX_READ_COMMITTED Constants.TX_REPEATABLE_READ Constants.TX_SNAPSHOT Constants.TX_SERIALIZABLE
Issue
5

Best practise loading big data

after a certain number of read accesses (every 10000 read access to commit and open a new transaction ... if this operation includes updates to the database or it is read only. If it is a read ... this scenario the data is only read so we do not need to commit - commit is a NOOP. If it is faster
JDO Doc
4

javax.jdo.identity.ByteIdentity

IOException, ClassNotFoundException Read this object. Read this object. Read the superclass first
JDO Doc
4

javax.jdo.identity.CharIdentity

. Since: JDO 1.0 void readExternal(ObjectInput in)throws IOException, ClassNotFoundException Read this object. Read this object. Read the superclass first. Parameters: in - the input Since: JDO 1.0 String
JDO Doc
4

javax.jdo.identity.IntIdentity

, ClassNotFoundException Read this object. Read this object. Read the superclass first. Parameters: in - the input
JDO Doc
4

javax.jdo.identity.LongIdentity

, ClassNotFoundException Read this object. Read this object. Read the superclass first. Parameters: in