Fast Object Database for Java - with JPA/JDO support

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157

[ODB1] Chapter 7 - JDOQL Queries

. When a more selective retrieval is needed, JDOQL (JDO Query Language) is used. JDOQL for JDO is like SQL ... a specified order. 7.1 Introduction to JDOQL A basic JDOQL query has the following three components ... a persistent class) A filter, which is a boolean expression in a Java like syntax The query result
137

JPA Criteria API Queries

The JPA Criteria API provides an alternative way for defining JPA queries, which is mainly useful for building dynamic queries whose exact structure is only known at runtime. JPA Criteria API vs JPQL JPQL queries are defined as strings, similarly to SQL. JPA criteria queries, on the other hand
135

JPA Named Queries

A named query is a statically defined query with a predefined unchangeable query string. Using named queries instead of dynamic queries may improve code organization by separating the JPQL query strings from the Java code. It also enforces the use of query parameters rather than embedding literals
134

Setting and Tuning of JPA Queries

The Query and TypedQuery interfaces define various setting and tuning methods that may affect query execution if invoked before a query is run using getResultList or getSingleResult. Result Range ... window that exposes a portion of a large query result list (hiding anything outside that window
133

Query Parameters in JPA

Query parameters enable the definition of reusable queries. Such queries can be executed with different parameter values to retrieve different results. Running the same query multiple times with different parameter values (arguments) is more efficient than using a new query string for every query
131

Running JPA Queries

The Query interface defines two methods for running SELECT queries: Query.getSingleResult - for use when exactly one result object is expected. Query.getResultList - for general use in any other case ... other case. In addition, the Query interface defines a method for running DELETE and UPDATE queries
127

JPA Query API

Queries are represented in JPA 2 by two interfaces - the old Query interface, which was the only interface available for representing queries in JPA 1, and the new TypedQuery interface that was introduced in JPA 2. The TypedQuery interface extends the Query interface. In JPA 2 the Query interface
124

JPA Queries

Queries are represented in JPA by the Query and TypedQuery interfaces: The JPA Query API section ... these interfaces to build and run JPQL queries. The TypedQuery interface (or alternatively the older Query interface) is the only neccessary interface for defining and running string based JPQL queries (e.g
123

DELETE Queries in JPA/JPQL

. Applying changes to the database by calling the commit method. JPQL DELETE queries provide an alternative way for deleting entity objects. Unlike SELECT queries, which are used to retrieve data from the database, DELETE queries do not retrieve data from the database, but when executed, delete specified
123

JPA Query Structure (JPQL / Criteria)

The syntax of the Java Persistence Query Language (JPQL) is very similar to the syntax of SQL. Having a SQL like syntax in JPA queries is an important advantage because SQL is a very powerful query ... classes and objects. For example, a JPQL query can retrieve and return entity objects

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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