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Literals in JPQL and Criteria Queries

Describes literals in JPQL, including null, false, true, numbers, strings, dates enums and types.... including NULL , boolean literals ( TRUE and FALSE ), numeric literals (e.g. 100 ), string literals (e.g. ... SQL, JPQL supports two boolean literals - TRUE and FALSE . Since JPQL is case insensitive, TRUE is equivalent to true and ...

 
manual

Logical Operators in JPQL and Criteria API

Explains how to use AND, OR and NOT in JPQL queries.... operand of an AND operator must be one of: TRUE, FALSE , and NULL . The following table shows how the AND ... TRUE FALSE NULL ...

 
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Comparison in JPQL and Criteria API

Explains how comparison operators can be used in JPQL queries, including in comparing null values.... == FALSE TRUE ... TRUE FALSE Comparison operators are always evaluated to ...

 
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@JoinColumn(nullable=false)

  During the evaluation of ObjectDB (We're currently developing with EclipseLink/mysql) I noticed was the following: ... following: I marked a @Column as nullable=false Than I tried to save it with the property as null ... ( name = "alarm_group_id" , nullable = false ) private AlarmGroup alarmGroup ; ...

 
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recovery enabled="false", still creates tablename.odb$ files

Running in embedded mode, configuration specifies "<recovery enabled ="false"... />".  Still, tablename.odb$ files get created, and if still present after an abrupt stop, the application will not restart properly.   What do we need to do to not utilize recovery files (not have orphan tablename.odb$ files)? ... mode, configuration specifies "<recovery enabled ="false"... />".  Still, tablename.odb$ files get created, and if still ...

 
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EntityManagerFactory Fails To Swtich Over To Slave When Master Is Unavailable

I have a simple task to validate the sample code will switch over to the slave database when the master is unavailable. I simulate the master unavailable by stopping the master server; which generates the following exception below. What am I doing wrong? It appears the connection manager fails to try the second URL in the list: objectdb://10.9.2.15:9998//10.9.2.15:9999/test.odb;user=admin;password=password Thank you in advance. ... <enhancement agent = "false" reflection = "warning" / > <cache ref ... / > <persist serialization = "false" / > <cascade - persist always = ...

 
manual

Database Management Settings

Explains settings and performance tuning of the ObjectDB Java object database for JPA/JDO.... <recovery enabled = "true" sync = "false" path = "." max = "128mb" /> <recording enabled = "false" sync = "false" path = "." mode = "write" /> ...

 
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Replication error on slave restart

I'm trying to enable replication on master server that was running with "recovery" enabled previously. I have copied database file to slave... and so on by manual. It worked fine. But if I restart slave server: ... <recording enabled = "true" sync = "false" path = "." mode = "write" /> Before you ... = "$objectdb/log/" max = "8mb" stdout = "false" stderr = "false" /> <log-archive path = ...

 
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significant performance decrease

we are using objected in embedded mode (on OS X and WINDOWS). The database increased now to around 400000 entities of one class (database file size around 1.5 GByte). The response time of standard queries increased with this database size to an unacceptable rate (several seconds compared to around 30% when the number of entities was just half of the current). We tried to optimize the cache settings, current objectdb.conf is: <!-- ObjectDB Configuration --> <objectdb> ... = "$objectdb/log/" max = "8mb" stdout = "false" stderr = "false" /> <log-archive path = "$objectdb/log/archive/" ...

 
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Replication Issue

Hi, I am trying to use replication for this first time - so most likely I am doing something wrong. I have server on which I run my master DB server java -cp objectdb.jar com.objectdb.Server start -conf objectdbMASTER.conf on the same server I run a java program - which is writing objects every second a database KAKI.odb - here is the code: ... = "$objectdb/log/" max = "8mb" stdout = "false" stderr = "false" /> <log-archive path = ...