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jOOQ and Scala
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
As any other library, jOOQ can be easily used in Scala, taking advantage of the many Scala language features such as for example:
- Optional "." to dereference methods from expressions
- Optional "(" and ")" to delimit method argument lists
- Optional ";" at the end of a Scala statement
- Type inference using "var" and "val" keywords
- Lambda expressions and for-comprehension syntax for record iteration and data type conversion
But jOOQ also leverages other useful Scala features, such as
- implicit defs for operator overloading
- Scala Macros (soon to come)
All of the above heavily improve jOOQ's querying DSL API experience for Scala developers.
A short example jOOQ application in Scala might look like this:
import collection.JavaConversions._ // Import implicit defs for iteration over org.jooq.Result
//
import java.sql.DriverManager //
//
import org.jooq._ //
import org.jooq.impl._ //
import org.jooq.impl.DSL._ //
import org.jooq.examples.scala.h2.Tables._ //
import org.jooq.scalaextensions.Conversions._ // Import implicit defs for overloaded jOOQ/SQL operators
//
object Test { //
def main(args: Array[String]): Unit = { //
val c = DriverManager.getConnection("jdbc:h2:~/test", "sa", ""); // Standard JDBC connection
val e = DSL.using(c, SQLDialect.H2); //
val x = AUTHOR as "x" // SQL-esque table aliasing
//
for (r <- e // Iteration over Result. "r" is an org.jooq.Record3
select ( //
BOOK.ID * BOOK.AUTHOR_ID, // Using the overloaded "*" operator
BOOK.ID + BOOK.AUTHOR_ID * 3 + 4, // Using the overloaded "+" operator
BOOK.TITLE || " abc" || " xy" // Using the overloaded "||" operator
) //
from BOOK // No need to use parentheses or "." here
leftOuterJoin ( //
select (x.ID, x.YEAR_OF_BIRTH) // Dereference fields from aliased table
from x //
limit 1 //
asTable x.getName() //
) //
on BOOK.AUTHOR_ID === x.ID // Using the overloaded "===" operator
where (BOOK.ID <> 2) // Using the olerloaded "<>" operator
or (BOOK.TITLE in ("O Alquimista", "Brida")) // Neat IN predicate expression
fetch //
) { //
println(r) //
} //
} //
}
For more details about jOOQ's Scala integration, please refer to the manual's section about SQL building with Scala.
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