Get Back in Control of your SQL

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Folien zum Vortrag von Lukas Eder zu jOOQ vor der Java Usergroup Berlin-Brandenburg am 10. Dezember 2013.

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Get Back in Control of your SQL

  1. 1. Get Back in Control of your SQL SQL and Java could work together so much better if we only let them. Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0
  2. 2. Intro SQL and Java About my motivation SQL dominates database systems SQL seems «low level» and «dusty» SQL can do so much more SQL should be «sexy» again Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0 jOOQ Examples
  3. 3. Intro SQL and Java jOOQ JDBC PreparedStatement stmt = connection.prepareStatement( "SELECT text FROM products WHERE cust_id = ? AND value < ?"); stmt.setInt(1, custID); stmt.setBigDecimal(2, BigDecimal.ZERO); ResultSet rs = stmt.executeQuery(); while (rs.next()) { System.out.println(rs.getString("TEXT")); } Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0 Examples
  4. 4. Intro SQL and Java JDBC – the naked truth 01: 02: 03: 04: 05: 06: 07: 08: 09: 10: 11: 12: 13: 14: 15: 16: 17: 18: 19: PreparedStatement stmt = connection.prepareStatement( "SELECT p.text txt" + (isAccount ? ", NVL(a.type, ?) " : "") + "FROM products p " + (isAccount ? " INNER JOIN accounts a USING (prod_id) " : "") + " WHERE p.cust_id = ? AND p.value < ?" + (isAccount ? " AND a.type LIKE '%" + type + "%'" : ""); stmt.setInt(1, defaultType); stmt.setInt(2, custID); stmt.setBigDecimal(3, BigDecimal.ZERO); ResultSet rs = stmt.executeQuery(); while (rs.next()) { Clob clob = rs.getClob("TEXT"); System.out.println(clob.getSubString(1, (int) clob.length()); } rs.close(); stmt.close(); Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0 jOOQ Examples
  5. 5. Intro SQL and Java jOOQ Examples JDBC – the naked truth 01: 02: 03: 04: 05: 06: 07: 08: 09: 10: 11: 12: 13: 14: 15: 16: 17: 18: 19: PreparedStatement stmt = connection.prepareStatement( // "SELECT p.text txt" + // (isAccount ? ", NVL(a.type, ?) " : "") + // "FROM products p " + // Syntax error when isAccount == false (isAccount ? " INNER JOIN accounts a USING (prod_id) " : "") + // " WHERE p.cust_id = ? AND p.value < ?" + // (isAccount ? " AND a.type LIKE '%" + type + "%'" : ""); // Syntax error and SQL injection possible stmt.setInt(1, defaultType); // Wrong bind index stmt.setInt(2, custID); // stmt.setBigDecimal(3, BigDecimal.ZERO); // ResultSet rs = stmt.executeQuery(); // while (rs.next()) { Clob clob = rs.getClob("TEXT"); System.out.println(clob.getSubString(1, (int) clob.length()); } // // ojdbc6: clob.free() should be called // // rs.close(); stmt.close(); // close() not really in finally block // Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0
  6. 6. Intro SQL and Java EJB 2.0 EntityBeans public interface CustomerRequest extends EJBObject { BigInteger getId(); String getText(); void setText(String text); @Override void remove(); } public interface CustomerRequestHome extends EJBHome { CustomerRequest create(BigInteger id); CustomerRequest find(BigInteger id); } Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0 jOOQ Examples
  7. 7. Intro SQL and Java EJB 2.0 – the naked truth <weblogic-enterprise-bean> <ejb-name>com.example.CustomerRequestHome</ejb-name> <entity-descriptor> <pool> <max-beans-in-free-pool>100</max-beans-in-free-pool> </pool> <entity-cache> <max-beans-in-cache>500</max-beans-in-cache> <idle-timeout-seconds>10</idle-timeout-seconds> <concurrency-strategy>Database</concurrency-strategy> </entity-cache> <persistence> <delay-updates-until-end-of-tx>True</delay-updates-until-end-of-tx> </persistence> <entity-clustering> <home-is-clusterable>False</home-is-clusterable> <home-load-algorithm>round-robin</home-load-algorithm> </entity-clustering> </entity-descriptor> <transaction-descriptor/> <enable-call-by-reference>True</enable-call-by-reference> <jndi-name>com.example.CustomerRequestHome</jndi-name> </weblogic-enterprise-bean> Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0 jOOQ Examples
  8. 8. Intro SQL and Java Hibernate – ORM Session session = sessionFactory.openSession(); session.beginTransaction(); session.save(new Event("Conference", new Date()); session.save(new Event("After Party", new Date()); List result = session.createQuery("from Event").list(); for (Event event : (List<Event>) result) { System.out.println("Event : " + event.getTitle()); } session.getTransaction().commit(); session.close(); Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0 jOOQ Examples
  9. 9. Intro SQL and Java Hibernate – «navigation» List result = session.createQuery("from Event").list(); for (Event event : (List<Event>) result) { System.out.println("Participants of " + event); for (Person person : event.getParticipants()) { Company company = person.getCompany(); System.out.println(person + " (" + company + ")"); } } Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0 jOOQ Examples
  10. 10. Intro SQL and Java jOOQ Hibernate – the naked truth <hibernate-mapping package="org.hibernate.tutorial.hbm"> <class name="Event" table="EVENTS"> <id name="id" column="EVENT_ID"> <generator class="increment"/> </id> <property name="date" type="timestamp" column="EVENT_DATE"/> <property name="title"/> <set name="participants" inverse="true"> <key column="eventId"/> <one-to-many entity-name="Person"/> </set> </class> </hibernate-mapping> Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0 Examples
  11. 11. Intro SQL and Java jOOQ JPA and EJB 3.0 EntityManager em = factory.createEntityManager(); em.getTransaction().begin(); em.persist(new Event("Conference", new Date()); em.persist(new Event("After Party", new Date()); List result = em.createQuery("from Event").getResultList(); for (Event event : (List<Event>) result) { System.out.println("Event : " + event.getTitle()); } em.getTransaction().commit(); em.close(); Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0 Examples
  12. 12. Intro SQL and Java jOOQ EJB 3.0 – the naked truth @Entity @Table(name = "EVENTS") public class Event { private Long id; private String title; private Date date; @Id @GeneratedValue(generator = "increment") @GenericGenerator(name = "increment", strategy = "increment") public Long getId() { /* … */ } @Temporal(TemporalType.TIMESTAMP) @Column(name = "EVENT_DATE") public Date getDate() { /* … */ } Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0 Examples
  13. 13. Intro SQL and Java jOOQ Examples EJB 3.0 – Annotatiomania™ @OneToMany(mappedBy = "destCustomerId") @ManyToMany @Fetch(FetchMode.SUBSELECT) @JoinTable( name = "customer_dealer_map", joinColumns = { @JoinColumn(name = "customer_id", referencedColumnName = "id") }, inverseJoinColumns = { @JoinColumn(name = "dealer_id", referencedColumnName = "id") } ) private Collection dealers; Found at http://stackoverflow.com/q/17491912/521799 Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0
  14. 14. Intro SQL and Java jOOQ Examples JPA 3.0 Preview – Annotatiomania™ @OneToMany @OneToManyMore @AnyOne @AnyBody @ManyToMany @Many @Fetch @FetchMany @FetchWithDiscriminator(name = "no_name") @JoinTable(joinColumns = { @JoinColumn(name = "customer_id", referencedColumnName = "id") }) @PrefetchJoinWithDiscriminator @IfJoiningAvoidHashJoins @ButUseHashJoinsWhenMoreThan(records = 1000) @XmlDataTransformable @SpringPrefechAdapter private Collection employees; Might not be true Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0
  15. 15. Intro SQL and Java jOOQ Examples Criteria – the naked truth EntityManager em= ... CriteriaBuilder builder = em.getCriteriaBuilder(); CriteriaQuery<Person> criteria = builder.createQuery(Person.class); Root<Person> person = criteria.from(Person.class); Predicate condition = builder.gt(person.get(Person_.age), 20); criteria.where(condition); TypedQuery<Person> query = em.createQuery(query); List<Person> result = query.getResultList(); Found at http://docs.oracle.com/javaee/6/tutorial/doc/gjrij.html Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0
  16. 16. Intro SQL and Java NoSQL? … Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0 jOOQ Examples
  17. 17. Intro SQL and Java jOOQ NoSQL? Seen at the O’Reilly Strata Conf: History of NoSQL by Mark Madsen. Picture published by Edd Dumbill Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0 Examples
  18. 18. Intro SQL and Java jOOQ Examples SQL is so much more | TEXT | VOTES | RANK | PERCENT | |-------------|-------|------------|---------| | Hibernate | 1383 | 1 | 32 % | | jOOQ | 1029 | 2 | 23 % | | EclipseLink | 881 | 3 | 20 % | | JDBC | 533 | 4 | 12 % | | Spring JDBC | 451 | 5 | 10 % | Data may not be accurate… Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0
  19. 19. Intro SQL and Java jOOQ SQL is so much more SELECT p.text, p.votes, DENSE_RANK() OVER (ORDER BY p.votes DESC) AS "rank", LPAD( (p.votes * 100 / SUM(p.votes) OVER ()) || ' %', 4, ' ' ) AS "percent" FROM poll_options p WHERE p.poll_id = 12 ORDER BY p.votes DESC Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0 Examples
  20. 20. Intro SQL and Java jOOQ The same with jOOQ select (p.TEXT, p.VOTES, denseRank().over().orderBy(p.VOTES.desc()).as("rank"), lpad( p.VOTES.mul(100).div(sum(p.VOTES).over()).concat(" %"), 4, " " ).as("percent")) .from (POLL_OPTIONS.as("p")) .where (p.POLL_ID.eq(12)) .orderBy(p.VOTES.desc()); Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0 Examples
  21. 21. Intro SQL and Java jOOQ The same with jOOQ in Scala (!) select (p.TEXT, p.VOTES, denseRank() over() orderBy(p.VOTES desc) as "rank", lpad( (p.VOTES * 100) / (sum(p.VOTES) over()) || " %", 4, " " ) as "percent") from (POLL_OPTIONS as "p") where (p.POLL_ID === 12) orderBy (p.VOTES desc) Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0 Examples
  22. 22. Intro SQL and Java Examples Copyright (c) 2009-2013 by Data Geekery GmbH. Slides licensed under CC BY SA 3.0 jOOQ Examples

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