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40

General Performance Issues Illustrated with a Specific Method

<ClientBasicData> listPatientsByIDsWithBasicData(String ids) { Long st = new Date().getTime ... size = " + cs.size()); Long ed = new Date().getTime(); System.out.println ... .Serializable; import java.util.Date; import javax.jdo.annotations.Index; import javax.persistence
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ORDER BY clause (JPQL / Criteria API)

JPQL expression whose type is comparable (i.e. numbers, strings and date values) and is derived
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General Settings and Logging

<yyyymmdd>.log (where <yyyymmdd> represents the date). A new log file is also generated when the log
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Database Explorer

the Explorer might display cached content that does not reflect the up to date data in the database. In
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javax.persistence.Query

position, Date value, TemporalType temporalType) Bind an instance of java.util.Date to a positional parameter. Bind an instance of java.util.Date to a positional parameter. Parameters: position - position ... if the value argument is of incorrect type Since: JPA 1.0 Query setParameter(String name, Date value
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javax.persistence.criteria.CriteriaBuilder

of objects as its result. Returns: criteria query object Since: JPA 2.0 Expression<Date> currentDate() Create expression to return current date. Create expression to return current date. Returns: expression for current date Since: JPA 2.0 Expression<Time> currentTime() Create expression to return
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javax.persistence.Temporal

) This annotation must be specified for persistent fields or properties of type java.util.Date and java.util ... annotation (when the element collection value is of such a temporal type. Example: @Temporal(DATE) protected java.util.Date endDate; Since: JPA 1.0 Learn how to define and use date and time
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javax.persistence.TemporalType

<TemporalType> Type used to indicate a specific mapping of java.util.Date or java.util.Calendar. Since: JPA 1.0 Learn how to define and use date and time fields in Chapter 2 of the ObjectDB/JPA manual. TemporalType DATE Map as java.sql.Date Map as java.sql.Date Since: JPA 1.0 TemporalType TIME Map as
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javax.jdo.JDOEntityManager

- the name of the Sequence Returns: the Sequence Since: JDO 2.0 Date getServerDate() Get the Date as seen by the server. Get the Date as seen by the server. Clients using this method can order ... to prepare a Date instance that represents UTC time on the server. Returns: a Date instance corresponding
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javax.jdo.PersistenceManager

Date getServerDate() Get the Date as seen by the server. Get the Date as seen by the server. Clients ... the setting of the server time zone to prepare a Date instance that represents UTC time on the server. Returns: a Date instance corresponding to the UTC Date as seen by the server Since: JDO 2.1 Object

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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