Fast Object Database for Java - with JPA/JDO support

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setCandidates(pcs)

Method javax.jdo.Query void setCandidates( Extent pcs ) Set the candidate Extent to query. Parameters: pcs - the candidate Extent. Since: JDO 1.0
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addExtension(key, value)

Method javax.jdo.Query void addExtension( String key, Object value ) Add a vendor-specific extension to this query. The key and value are not standard. An implementation must ignore keys that are not recognized. Parameters: key - the key of the extension value - the value of the extension Since: JDO 2.0
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isUnmodifiable()

Method javax.jdo.Query boolean isUnmodifiable() The unmodifiable flag, when set, disallows further modification of the query, except for specifying the range, result class, and ignoreCache option. Returns: the current setting of the flag Since: JDO 2.0
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deletePersistentAll(parameters)

Method javax.jdo.Query long deletePersistentAll( Object... parameters ) Deletes all the instances of the candidate class that pass the filter. Parameters: parameters - for the query Returns: the number of instances of the candidate class that were deleted Since: JDO 2.0 See Also: deletePersistentAll()
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Query.SQL

Static Field javax.jdo.Query String SQL The string constant used as the first argument to PersistenceManager.newQuery(String,Object) to identify that the created query should use SQL semantics. This is only meaningful for relational JDO implementations. If this is used, the Object argument
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execute(p1, p2, p3)

Method javax.jdo.Query Object execute( Object p1, Object p2, Object p3 ) Execute the query and return the filtered Collection. Parameters: p1 - the value of the first parameter declared. p2 - the value of the second parameter declared. p3 - the value of the third parameter declared. Returns
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execute(p1, p2)

Method javax.jdo.Query Object execute( Object p1, Object p2 ) Execute the query and return the filtered Collection. Parameters: p1 - the value of the first parameter declared. p2 - the value of the second parameter declared. Returns: the filtered Collection. Since: JDO 1.0 See Also: executeWithArray(Object[] parameters)
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setUnmodifiable()

Method javax.jdo.Query void setUnmodifiable() The unmodifiable flag, when set, disallows further modification of the query, except for specifying the range, result class, and ignoreCache option. The unmodifiable flag can also be set in metadata. Since: JDO 2.0
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WHERE clause (JPQL / Criteria API)

JPQL query that retrieves selective objects from the database. Out of the four optional clauses of JPQL queries, the WHERE clause is definitely the most frequently used. How a WHERE Clause Works The following query retrieves only countries with population size that exceeds a specified limit
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isBound(param)

Method javax.persistence.Query boolean isBound( Parameter param ) Return a boolean indicating whether a value has been bound to the parameter. Parameters: param - parameter object Returns: boolean indicating whether parameter has been bound Since: JPA 2.0

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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