JooQ: SQL orientado a objetos.

1. jOOQ
SQL orientado a objetos
The Developers Conference
São Paulo - 2016

2. Gabriel Saraiva
Desenvolvedor na

3. SQL ❤
String sql = "SELECT * FROM users WHERE email = ?";
PreparedStatement stmt = conn.prepareStatement(sql);
stmt.setString(1,"example@xyz.com");

4. SQL ❤ ?
String sql = "UPDATE products" +
"SET name = ?, ..., price = ?" +
"WHERE id = ?";
PreparedStatement stmt = conn.prepareStatement(sql);
stmt.setString(1, "Café");
// 98 campos depois...
stmt.setLong(99, 123L);
(╯°□°)╯︵ ┻━┻

5. String sql = "SELECT avg(age), cityId " +
"FROM users " +
(filter ? "WHERE cityId IN (...) ":"") +
"GROUP BY cityId " +
(order ? "ORDER BY name DESC":"") +
...
;
SQL !!!

6. SQL:
“Stringish Query Langage” ?
SQL = Structured Query Language

7. O problema não é o SQL.
É como escrevemos SQL.

8. SQL ❤ !!!
String sql = select()
.from(USERS)
.where(
USERS.ID.in(ids)
)
.toString();

9. “The easiest way to write SQL in Java”
or in
Scala

10. jOOQ:
Uma DSL para
escrever SQL

11. Setup:
1 minuto.

12. Setup:
1 minuto.
<dependency>
<groupId>org.jooq</groupId>
<artifactId>jooq</artifactId>
<version>3.8.2</version>
</dependency>
<dependency>
<groupId>org.jooq</groupId>
<artifactId>jooq-meta</artifactId>
<version>3.8.2</version>
</dependency>
<dependency>
<groupId>org.jooq</groupId>
<artifactId>jooq-
codegen</artifactId>
<version>3.8.2</version>
</dependency>

13. Setup:
1 minuto
ou mais!

14. Type Safe
select()
.from(USERS)
.where(
USERS.EMAIL.equal(1234)
)

15. Sintaxe
Fluente
select()
.from(USERS)
.where(
USERS.ID.equal(1234),
USERS.AGE.equal(26)
)

16. SQL
Injection
Safe
String name =
"Bob"); DROP TABLE users; --";
select()
.from(USERS)
.where(
USERS.NAME.eq(name)
)

17. Free:
p/ bancos
Open Source

18. $$$:
p/ bancos
Enterprise
mais informações disponíveis em: http://www.jooq.
org/legal/licensing#databases

19. Modelo
do Banco:
(opcional)
Automático!

20. <configuration>
<jdbc>
<driver>com.mysql.jdbc.Driver</driver>
<url>jdbc:mysql://localhost:3306</url>
<user>root</user>
<password>password</password>
</jdbc>
<generator>
<database>
<name>org.jooq.util.mysql.MySQLDatabase</name>
<includes>.*</includes>
<excludes/>
<inputSchema>example_database</inputSchema>
<unsignedTypes>false</unsignedTypes>
</database>
<target>
<packageName>com.example.database</packageName>
<directory>src/main/java</directory>
</target>
</generator>
</configuration>

21. Usando o jOOQ para
escrever SQL

22. 1 minuto de setup: Sem modelo do db.
String sql = DSL.using(SQLDialect.MYSQL)
.select(field("name"), field("phone"))
.from("users")
.where(
field("id").equal(1234)
)
.toString();

23. 2 minutos de setup: Modelo db automático
String sql = select(USERS.NAME, USERS.PHONE)
.from(USERS)
.where(
USERS.ID.eq(1234L)
)
.toString();

24. Inserts sem
?,?,?,?,?,?,,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?
,?,? será que faltou um ?
String sql = insertInto(USERS)
.set(USERS.NAME,"Gabriel Saraiva")
.set(USERS.PHONE,"16999666333")
.set(USERS.EMAIL,"gabrielsaraiva7@gmail.com")
.toString();

25. Filtros
String sql = select()
.from(PRODUCTS)
.where(PRODUCTS.CATEGORY.eq("drinks")
.or(PRODUCTS.CATEGORY.eq("beers"))
.and(PRODUCTS.NAME.contains("coffee"))
)
.toString();

26. Lista de Filtros
List<Condition> filters = Arrays.asList(
PRODUCTS.CATEGORY.equal("drinks"),
PRODUCTS.PRICE.greaterThan(new BigDecimal(25))
);
String sql = select(PRODUCTS.NAME, PRODUCTS.PRICE)
.from(PRODUCTS)
.where(filters)
.orderBy(PRODUCTS.PRICE.desc())
.toString();

27. Joins!
Users u = USERS;
Orders o = ORDERS;
OrdersProducts op = ORDERS_PRODUCTS;
Products p = PRODUCTS;
String sql = select()
.from(u
.innerJoin(o).on(u.ID.eq(o.USER_ID))
.innerJoin(op).on(o.ID.eq(op.ORDER_ID))
.innerJoin(p).on(p.ID.eq(op.ORDER_ID))
)
.toString();

28. Group By!
String sql = DSL.
select(
u.NAME,
o.ID,
sum(op.PRODUCT_SOLD_PRICE)
)
.from(join)
.where(filters)
.groupBy(o.ID)
.toString();

29. Lendo dados do ResultSet
ResultSet rs = stmt.executeQuery();
rs.next();
return new Product(
rs.getLong(PRODUCTS.ID.getName()),
rs.getString(PRODUCTS.NAME.getName()),
rs.getBigDecimal(PRODUCTS.PRICE.getName()),
rs.getString(PRODUCTS.CATEGORY.getName())
);

30. Escrever SQL
pode ser
divertido!

31. Obrigado
Gabriel Saraiva
gabriel.saraiva7@gmail.com
github.com/gabrsar
twitter/gabrielSaraivaAgradecimentos ❤
Igor Escobar
Giuliano Caliari
Diego Leme