About comparison

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Calculating age in query?

? thanks! Alex You can use a JPQL query with a simple date comparison: SELECT p FROM Person p WHERE p
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Calendar in Criteria Querys

. Anyway, the following example demonstrates criteria queries with Calendar. The usual comparison methods
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Compare old and new schema

etc... All these changes frequently take place between software versions and an automatic comparison of old schema vs
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Create simple index for a Id field

operations (see this comparison). But obviously a HashMap in memory is faster than any DBMS for simple
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EntityManager JPA or JDO impl and different behavior

"hashcode" method use more than the database id for generation or comparison, it all fails horribly
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evictAll() behavior

has to keep strong references to objects to detect changes on commit by snapshot comparison).   OK it works
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First query takes 4+ minutes to complete

in comparison responds within few seconds on average with the same number of records. We hope
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How to add minutes to a Date with JPA2

date and send the result as an argument for direct comparison with the date field?   Yes, good idea
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Insertion Speed Rate and Batch Load

comparison in the JPA benchmark: http://jpab.org/Basic/Persist/Many.html So, my close to reality use
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Performance in large transactions

and requires comparison on every flush. To avoid this, we introduce now a new method, con.objectdb