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3

JPA Criteria API Queries

above are direct links to the criteria query sections in pages that describe query structure in general ... that describe expressions in general, including in the context of string based JPQL queries.
3

GROUP BY and HAVING clauses

The GROUP BY clause enables grouping of query results. A JPQL query with a GROUP BY clause returns properties of generated groups instead of individual objects and fields. The position of a GROUP BY ... ) that are generated by the FROM clause iteration and pass the WHERE clause filtering (if any) are sent
2

javax.persistence.SequenceGenerator

get methods) Defines a primary key generator that may be referenced by name when a generator element is specified for the GeneratedValue annotation. A sequence generator may be specified on the entity class or on the primary key field or property. The scope of the generator name is global
0

Step 2: Entity Class and Persistence Unit

the [Provider and Database] step just click Finish to generate a default persistence.xml file ... + ")"; } } A default JPA persistence unit (with default settings) was generated in a persistence.xml
0

Step 5: Add a JSP Page

In this step we will add the JSP that generates the guestbook page output: Open the [New JSP File] dialog box by right clicking the Web Pages node (in the [Projects] window) and selecting New > JSP ... ="no" width="100%" height="30"></iframe> </body> </html> The JSP generates the guestbook page
0

Step 2: Entity Class and Persistence Unit

the [Provider and Database] step click Finish to generate a default persistence.xml file ... + ")"; } } A default JPA persistence unit (with default settings) was generated in a persistence.xml file
0

Step 5: Add a JSP Page

In this step we will add the JSP that generates the guestbook page output: Open the [New JSP File] dialog box by right clicking the Web Pages node (in the [Projects] window) and selecting New > JSP ... > </body> </html> The JSP generates the guestbook page output, which contains a simple form
0

Step 5: Add a JSP Page

In this step we will add the JSP that generates the guestbook page output: Open the [New JSP File] dialog box by right clicking the WebContent node (in the [Package Explorer] window), selecting New ... ="no" width="100%" height="30"> </iframe> </body> </html> The JSP generates the guestbook page
0

Step 5: Add a JSP Page

In this step we will add the JSP that generates the guestbook HTML output: Open the [New JSP File] dialog box by right clicking WEB-INF under src/main/webapp (in the [Package Explorer] window ... %" height="30"> </iframe> </body> </html> The JSP generates the guestbook page output
0

Step 5: Add a JSP Page

In this step we will add the JSP that generates the guestbook page output: Open the [New JSP File] dialog box by right clicking the WebContent node (in the [Package Explorer] window), selecting New ... > </html> The JSP generates the guestbook page output, which contains a simple form for signing

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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