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What algorithm in find()

, the time cost in the attachment shows a O(n) complexity. Why? The cost of insertion is subjected ... do the same test in MySQL server, the insertion complexity is still O(n). see the attachment. gzdillon


javax.persistence.metamodel Interface Bindable<T> Subinterfaces: CollectionAttribute, EntityType, ListAttribute, MapAttribute, PluralAttribute, SetAttribute, SingularAttribute Instances of the type Bindable represent object or attribute types that can be bound into a Path. Since: JPA 2.0 Class<T

storeFloatField(fieldNumber, value)

Method javax.jdo.spi.PersistenceCapable.ObjectIdFieldConsumer void storeFloatField( int fieldNumber, float value ) Store one field into the field manager. This field was retrieved from the field of the ObjectId. Parameters: fieldNumber - the field number of the key field. value - the value of the field from the ObjectId. Since: JDO 1.0


Method javax.jdo.Query void setClass( Class cls ) Set the class of the candidate instances of the query. The class specifies the class of the candidates of the query. Elements of the candidate collection that are of the specified class are filtered before being put into the result Collection


javax.jdo.annotations Annotation Embedded Target: Fields (including property get methods) Annotation to define that the object is embedded into the table of the owning object. Corresponds to the xml element "embedded". Since: JDO 2.1 Persistent[] members Members for this embedding. Members


classes in the cache are first flushed to the datastore. Instances in the cache or brought into


Annotation Element javax.jdo.annotations.Query Class resultClass Result class into which to put the results. Returns: the class of the result Default value: void.class Since: JDO 2.1

putUserObject(key, val)

Method javax.jdo.PersistenceManager Object putUserObject( Object key, Object val ) Put the specified key-value pair into the map of user objects. Parameters: key - val - Since: JDO 2.0


to it, so it is quite possible to put the PersistenceManager's connection into an invalid state. Returns: the native connection Since: JDO 2.0


Method javax.jdo.listener.LoadCallback void jdoPostLoad() Called after the values are loaded from the data store into this instance. This method is not modified by the enhancer. Derived fields should be initialized in this method. The context in which this call is made does not allow access to other persistent JDO instances. Since: JDO 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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