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FROM clause (JPQL / Criteria API)

, which has two range variables and a WHERE clause. However, this second query form that uses a join variable is preferred. Besides being shorter and cleaner, the second query describes the right

Index Definition

= 100 AND p.y = 100 SELECT p FROM Point p WHERE p.x = 100 AND p.y BETWEEN 50 AND 80 For the second query above, the index order should be x first and y second. Indexes on collections are useful in

JPA / JDO Class Enhancer

addition, a class loader for loading classes for enhancement can be specified as a second argument: com ... on Sun JDK 6 or above (and not on JRE 6 for example). Second, classes that are loaded into the JVM

Locking in JPA

argument is an entity object. The second argument is the requested lock mode ... (on the second lock request). Pessimistic Lock Timeout By default, when a pessimistic lock conflict

SELECT clause (JPQL / Criteria API)

cell contains the country name (c.name) and the second array cell contains the capital city name (c

Database Transaction Replayer

com.objectdb.Replayer my.odb 1000 When a transaction ID is specified as a second argument

Strings in JPQL and Criteria Queries

(%) is a wildcard. The second (which appears after the escape character) represents a real % character

WHERE clause (JPQL / Criteria API)

)); Multiple Restrictions The second where method takes a variable number of arguments of Predicate type

[ODB1] Chapter 8 - ObjectDB Server

. The reload attribute specifies how often (in seconds) the server checks the configuration file for changes. For instance, a value of 30 (as specified above) indicates a check every 30 seconds. If a change ... inactivity time (in seconds). If a connection is inactive for more than the specified time the server

[ODB1] Chapter 5 - JDO Connections

milliseconds and then makes another attempt to obtain the lock. After 40 retries (about 2 seconds ... succeeds while the second fails, throws an exception, and is rolled back automatically. Optimistic

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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