About query

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Manual
59

Database Management Settings

" synchronized="false" />    <query-cache results ... " operations (which modify the database) have to be recorded. For debugging of query failure ... execution of relevant queries. The <query-cache> element <query-cache results="32mb" programs="500
Manual
59

ORDER BY clause (JPQL / Criteria API)

The ORDER BY clause specifies a required order for the query results. Any JPQL query that does not ... Expressions The following query returns names of countries whose population size ... directly from expressions in the SELECT clause are allowed in the ORDER BY clause. The following query
Manual
56

Paths and Types in JPQL and Criteria API

, string, date). Simple type values are more useful in queries. They have special operators ... through a NULL value The following query retrieves country names with their capital city names: SELECT ... . It might be easier to understand exactly how this works by considering the equivalent JOIN query
JDO Doc
50

javax.jdo.annotations.Query

javax.jdo.annotations Annotation Query Target: Classes Annotation for a named query. Corresponds to the xml element "query". Since: JDO 2.1 Extension[] extensions Vendor extensions. Vendor extensions ... of the fetch plan used by this query The name of the fetch plan used by this query Returns: the fetch plan
Manual
50

Comparison in JPQL and Criteria API

Most JPQL queries use at least one comparison operator in their WHERE clause. Comparison Operators ... , the JDO Query Language). ObjectDB supports both forms. Besides the different notation ... can be compared by using any comparison operator. Equality operators (=, <>, ==, !=) on strings in queries
Manual
50

Logical Operators in JPQL and Criteria API

Logical operators in JPQL and in JPA criteria queries enable composition of complex JPQL boolean ... , the JDO Query Language). ObjectDB supports both forms. Binary AND (&&) Operator The following query ... The following query retrieves countries whose population or area exceeds a specified limit: SELECT c FROM
JDO Doc
49

addSubquery(sub, variableDeclaration, candidateCollectionExpression, parameters)

Method javax.jdo.Query void addSubquery(   Query sub,   String variableDeclaration,   String candidateCollectionExpression,   String... parameters ) Add a subquery to this query. A subquery is composed as a Query and subsequently attached to a different query (the outer query) by calling
FAQ
49

Is ObjectDB a NoSQL Database?

of NoSQL technology, which are weak query capabilities and lack of ACID (atomicity, consistency, isolation, durability). Unlike other NoSQL solutions, ObjectDB provides full support of rich complex queries, using two standard Java query languages: JPQL (Java Persistence Query Language) and JDOQL (JDO
JDO Doc
47

addSubquery(sub, variableDeclaration, candidateCollectionExpression, parameters)

Method javax.jdo.Query void addSubquery(   Query sub,   String variableDeclaration,   String candidateCollectionExpression,   Map parameters ) Add a subquery to this query. The Map version ... without the leading ":", and the value as the name of the expression in the outer query. If the trimmed
JPA Doc
47

getResultList()

Method javax.persistence.Query List getResultList() Execute a SELECT query and return the query ... for a Java Persistence query language UPDATE or DELETE statement QueryTimeoutException - if the query execution exceeds the query timeout value set and only the statement is rolled