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13

Composite indexes

of all - the first member in composite index should be a field that is most commonly used in WHERE clauses or maybe ... member in many @Indexes? Something like that : @Index(members = { "lastModificationDate", "isPublished" }) @Index(members = { "author", "isPublished" }) I use isPublished field in
13

com.objectdb.o.NLV cannot be cast to com.objectdb.o.CMV

the exact cause. support Support The mapFormCli filed is a member of a number of composite indices ... for popular searches     @Index(members={"mapToCli", "mapFromCli"}),     @Index(members={"mapToCli", "mapFromCli", "callDirection"}),     @Index(members={"startDate", "mapToCli", "mapFromCli
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JPQL IN Operator

Lister The IN operator is currently not supported but you can use MEMBER OF instead. See more details ... .capabilityId member of :capabilities"     + "   and dv.creationtime >= :earliest"     + "   and dv ... DataValue dv   where dv.capabilityId.capabilityId member of :capabilities   and dv.creationtime
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Date field Index is corrupted due to time change

",         allocationSize=1     )     @Indices({         // Indices for popular searches         @Index(members={"startDate", "startTime", "channelNumber"}),         @Index(members={"startDate"}),         @Index(members={"startTime"}),         @Index(members={"startDate", "mapToCli", "mapFromCli
0

Inheritance.strategy

Annotation Element javax.jdo.annotations.Inheritance InheritanceStrategy strategy Strategy to use for inheritance. Specifies in which table(s) the members for the class are stored. Returns: the inheritance strategy Default value: javax.jdo.annotations.InheritanceStrategy.UNSPECIFIED Since: JDO 2.1
0

Persistent.recursionDepth

Annotation Element javax.jdo.annotations.Persistent int recursionDepth Recursion depth for this member. Used only when the annotation is used within the definition of a FetchGroup. Returns: the recursion depth Default value: 1 Since: JDO 2.1
0

Persistent.nullIndicatorColumn

Annotation Element javax.jdo.annotations.Persistent String nullIndicatorColumn Null indicator column for this member. Used for nested embedded fields or properties to indicate whether the embedded instance should have a null value. Returns: the null indicator column Default value: "" Since: JDO 2.1
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Persistent.extensions

Annotation Element javax.jdo.annotations.Persistent Extension[] extensions Vendor extensions for this member. Returns: the vendor extensions Default value: {} Since: JDO 2.1
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Persistent.loadFetchGroup

Annotation Element javax.jdo.annotations.Persistent String loadFetchGroup Name of the fetch-group to use when this member is loaded due to being referenced when not already loaded. Returns: the name of the load fetch group Default value: "" Since: JDO 2.1
0

Persistent.column

Annotation Element javax.jdo.annotations.Persistent String column Column name where the values are stored for this member. Returns: the name of the column Default value: "" Since: JDO 2.1

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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