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111-120 of 200 resultsRefreshDatabase Schema Evolution. If the old type is inconvertible to the new type (for instance a change from int to Date ... conversions are supported: From any numeric type to any numeric type. In ... ordinal values (the default). From any type to Boolean or boolean (0 | |
CRUD Database Operations with JPA/EntityManager/createQuery_String">createQuery("SELECT COUNT(p) FROM Point p"); System.out.println ... > The query string ("SELECT COUNT(p) FROM Point p") instructs JPA to count all the Point objects ... ">createQuery("SELECT AVG(p.x) FROM Point p"); System.out.println("Average X: " + q2. | |
JPA Persistable Types times. Referencing instances of other persistable types from multiple Aside from these constraints, an entity class is like any other Java class ... are represented from">in queries by entity names. By default | |
Index Definition>double. Equivalent wrapper classes from package java.lang: Byte SELECT p FROM Point p WHERE p.x = 100 SELECT p FROM Point p WHERE p.x BETWEEN 50 AND 80 SELECT p FROM Point p WHERE p.x >= 50 AND p.x <= 80 By using | |
Strings in JPQL and Criteria Queries>) is returned if the substring is not found. The third argument (when present) specifies from ... and Trailing Characters The TRIM([[LEADING|TRAILING|BOTH] [char] FROM] str). TRIM(LEADING FROM ' UK ') is evaluated to | |
Privacy Policy of the Service or from the Service infrastructure itself (for example, the duration of a page visit ... to ObjectDB Website, accessible from https://www.objectdb.com from Your jurisdiction. Your consent to this Privacy | |
[ODB1] Chapter 8 - ObjectDB Server accessing these databases from remote machines by TCP/IP. More details about client server mode vs. embedded ... program from the command line, as so: > java -cp <OBJECTDB_HOME> ... to the server only from the specified IP address. For instance, the "127.0.0.1" value | |
[ODB1] Chapter 3 - Persistent Classes/manual/chapter4">Chapter 4 explains how to write the JDO metadata declaration. Aside from ... ), inheritance (even from a non persistent class), interface implementations, inner classes ... to exclude other fields from being stored in the database. It is recommended to explicitly define | |
[ODB1] Chapter 7 - JDOQL Queries There are various ways to retrieve objects from an ObjectDB database, as shown in ... for RDBMS. It provides object retrieval from the database according to a specified selectioPlan ... The query result is a subset of objects from the candidate collection | |
[ODB1] Chapter 5 - JDO Connections>PersistenceManagerFactory instance may manage a pool of free PersistenceManager instances. From ... is the same for both new database connections and database connections obtained from a pool. PersistenceManager instances obtained from that factory. Setting these flags |