Get Back in Control of Your SQL with jOOQ at #Java2Days

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

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


jOOQ

Examples

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"));
}


Examples

Intro

SQL and Java

JDBC – the naked truth

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"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);
while (rs.next()) {
Clob clob = rs.getClob("TEXT");
System.out.println(clob.getSubString(1, (int) clob.length());
}
rs.close();
stmt.close();


jOOQ

Examples

Intro

SQL and Java

jOOQ

Examples

JDBC – the naked truth

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//
"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
//
//
//
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
//


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);
}


jOOQ

Examples

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>


jOOQ

Examples

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();


jOOQ

Examples

Intro

SQL and Java

Hibernate – «navigation»

List result = session.createQuery("from Event").list();
System.out.println("Participants of " + event);
for (Person person : event.getParticipants()) {
Company company = person.getCompany();
System.out.println(person + " (" + company + ")");

}
}


jOOQ

Examples

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>


Examples

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();
System.out.println("Event : " + event.getTitle());
}
em.getTransaction().commit();
em.close();


Examples

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() { /* … */ }


Examples

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

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

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

Intro

SQL and Java

NoSQL?

…


jOOQ

Examples

Intro

SQL and Java

jOOQ

NoSQL?

Seen at the O’Reilly Strata Conf:
History of NoSQL by Mark Madsen. Picture published by Edd Dumbill

Examples

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…


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


Examples

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());


Examples

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)


Examples

Intro

SQL and Java

Examples


jOOQ

Examples

Get Back in Control of Your SQL with jOOQ at #Java2Days

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