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116

Handling a case of searching an empty database

Handling a case of searching an empty database
14

Schema Update

. The default configuration file contains an empty <schema> element. If the <schema> element is not empty
14

Database Explorer

] are initialized to contain all the persistent fields, but the [Summary] view is initialized as an empty view. Therefore, unless set, persistent objects are presented in the Tree viewer as an empty set of fields
14

Database Connection using JPA

a map of properties (as demonstrated above). To obtain a connection to an empty database (discarding ... = Persistence.createEntityManagerFactory("objectdb:myDbFile.tmp;drop"); Getting an empty clean
9

JPA Lifecycle Events

defines all the supported callback methods with empty implementations: @Entity public static class
9

FROM clause (JPQL / Criteria API)

,DELETE, DESC, DISTINCT, ELSE, EMPTY, END, ENTRY, ESCAPE, EXISTS, FALSE, FETCH,FROM, GROUP, HAVING, IN
9

ObjectDB Object Database Features

& functions (LIKE, CONCAT, TRIM, SUBSTRING, ...). JPQL collection operators & functions (IS EMPTY, MEMBER
9

General Settings and Logging

is empty ("") logging to file is disabled. Every day a new log file is generated with the name odb
1

[ODB1] Chapter 9 - ObjectDB Explorer

. For a new, empty database this window is empty. A new persistent class is automatically added ... " are initialized to contain all the persistent fields, but the "Summary" is initialized as an empty view. Therefore, unless set, persistent objects are presented in the Browser viewer as an empty set of fields
1

[ODB1] Chapter 2 - A Quick Tour

as is. If the database is not empty (not the first run), a previously stored ArrayList instance ... ), an exception is thrown and a new empty ArrayList instance is created (line 24). The new ArrayList ... must have a name attribute. An empty name is specified for the <package> element to represent

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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