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persitencia (Preguntas y respuestas)

getRowCount() with a SELECT COUNT query. Implement getValueAt() with an ORDER BY query. support Support I

errors on repair

we are using version 2.6.7. On running the doctor we have message like free page list broken ... unexpected total page count ... what could be the reason for this ? hgzwicker Hans-Georg Zwicker Unfortunately these are critical errors that indicate a corrupted database file. Please provide

Multithreading Test and Deadlock

I move on to testing the multi threaded part of ObjectDB. From the same code (MyMain.java), I set the thread count from 1 to 4 and not only do I found it's slower overall (each thread only needs to insert 250K entities) but the threads are stuck with a deadlock. All threads share the same

ClassCastException on SELECT NEW ... after UPDATE over Java RMI

via RMI after the update. For example SELECT COUNT(*) ..., or SELECT r FROM ... all work fine. DB Doctor

Query filter comparing Dates

am comparing 2 dates which should be equal because they are showing exactly same inner millisecond count. I

Grouping by date()

hour(ov.created), count(ov) from ObjectView ov group by hour(ov.created) order by hour(ov.created) ASC

How to convert a boolean to an int in the query?

likedPersons ORDER BY (m.approveEmail + m.approvePhoneNumber + ... + (count(likedPersons) > 0)) galandor

java.lang.ClassCastException: com.objectdb.o.RFV cannot be cast to com.objectdb.o.RSV

The following query: SELECT count(m) FROM Message m WHERE m.attachments.original=:template is generating this exception: [ObjectDB 2.5.1_05] Unexpected exception (Error 990)   Generated by Java HotSpot(TM) 64-Bit Server VM 1.6.0_32 (on Windows 7 6.1). Please report this error on http://www

ObjectDB needs "insert ignore"

have to do this for inserting: @NamedQuery( name="isExistName", query="SELECT count(c) FROM Student c

com.objectdb.o.InternalException: null

% 100% Page Content Errors ------------------- [1] Page #10 entry 5 has unexpected field count

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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