About COUNT

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Manual
20

CRUD Database Operations with JPA [2011-02-11]

objects in the database by using a simple query: Query q1 = em.createQuery("SELECT COUNT(p) FROM Point ... COUNT(p) FROM Point p") instructs JPA to count all the Point objects in the database. If you have used
Manual
20

CRUD Database Operations with JPA

objects in the database by using a simple query: Query q1 = em.createQuery("SELECT COUNT(p) FROM Point ... COUNT(p) FROM Point p") instructs JPA to count all the Point objects in the database. If you have used
Manual
11

Numbers in JPQL and Criteria Queries

Numeric values may appear in JPQL queries in many forms: as numeric literals - e.g. 123, -12.5. as parameters - when numeric values are assigned as arguments. as path expressions - in navigation to persistent numeric fields. as aggregate expressions - e.g. COUNT. as collection functions
Result
11

ObjectDB Object Database Features

). GROUP BY (including HAVING and aggregates). ORDER BY (including ASC, DESC). Aggregates (COUNT, SUM
Manual
11

FROM clause (JPQL / Criteria API)

_LENGTH, CHARACTER_LENGTH, CLASS, COALESCE, CONCAT, COUNT, CURRENT_DATE, CURRENT_TIME, CURRENT
Manual
11

JPA Criteria API Queries

, having, count, sum, avg, min, max, ...). ORDER BY clause (orderBy, Order, asc, desc). The links
Manual
11

ORDER BY clause (JPQL / Criteria API)

WHERE 'Europe' MEMBER OF c.continents GROUP BY c.currency HAVING COUNT(c) > 1 ORDER BY c.currency
FAQ
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Is ObjectDB better than competing object databases?

queries (max, min, count, sum and avg). ObjectDB supports rich queries, including aggregate queries
Manual
11

JPA Query Structure (JPQL / Criteria)

GROUP BY / HAVING (groupBy, having, count, sum, avg, min, max, ...). Criteria ORDER BY (orderBy, Order, asc, desc).
Tutorial
11

Step 3: Add a Main Class

: Query q1 = em.createQuery("SELECT COUNT(p) FROM Point p"); System.out.println("Total