Clone the Java from here -> https://github.com/mrjavascript/CentralPaJug08042015

1. An evening with
Querydsl
Central PA Java Developers
Mike Melusky
@mrjavascript

2. About the Speaker
 Michael Melusky
 Java / Spring / JetBrains enthusiast
 Software Engineer for Audacious Inquiry in Baltimore, MD (http://ainq.com/)
 Professor at Penn State University
 Instructor at ITT Technical Institute

3. What is Querydsl?
 Querydsl is a query framework for Java which generates type safe queries
across multiple platforms
 JPA
 JDO
 JDBC
 Lucene
 Hibernate Search (HQL)
 MongoDB
 Collections
 RDFBean

4. What is Querydsl?
 With a domain model changing type-safety yields to benefits with software
development
 Domain changes are reflected in queries
 Autocomplete in query construction makes query construction faster and safer
 This project was originally started by the Mysema company (Helsinki, Finland)
out of the need to maintain HQL queries in a type-safe way
 Requires string concatenation
 Hard to read code
 Unsafe references to domain types and properties via Strings

5. Hasn’t this been done before?
 JOOQ
 Free for open source databases
 MyBatis
 Yank
 JDBI

6. Sample Application
 Bookstore Application
 Data Model:
 Book (bookName, isbn, author)
 Author (authorName)

7. Sample Application
 Java 8
 Spring Boot 1.2.5
 Gradle
 Code will be available on github.com/mrjavascript after this meeting.