SQL Server has this nice feature called table-valued parameters (TVP), where users can pass table variables to a stored procedure for bulk data processing. This is particularly nice when the stored procedure is an inline table valued function, i.e. a function that returns a table as well. For instance:

CREATE TYPE numbers AS TABLE (i INTEGER);
 
CREATE FUNCTION cross_multiply (
  @numbers numbers READONLY
)
RETURNS @result TABLE (
  i1 INTEGER,
  i2 INTEGER,
  product INTEGER
)
AS
BEGIN
  INSERT INTO @result
  SELECT n1.i, n2.i, n1.i * n2.i
  FROM @numbers n1
  CROSS JOIN @numbers n2
 
  RETURN
END

The above function creates a cross product of a table with itself and multiplies each possible combination. So, when calling this with the following table argument:

DECLARE @arg NUMBERS;
INSERT INTO @arg VALUES (1),(2),(3),(4);
SELECT * FROM cross_multiply(@arg);

i1i2product
-----------------------
111
212
313
414
122
224
326
428
133
236
339
4312
144
248
3412
4416

Easy, eh?

Now let's call the above from Java, with jOOQ.

No problem with jOOQ 3.10. Don’t worry about the boring JDBC data type binding details, as the jOOQ code generator has you covered. As always, all routines are generated classes/methods, and this time, the TABLE type is also a generated type. Let the code speak for itself. Instead of this SQL statement:

DECLARE @arg NUMBERS;
INSERT INTO @arg VALUES (1),(2),(3),(4);
SELECT * FROM cross_multiply(@arg);

Numbers numbers = new NumbersRecord(
    new NumbersElementTypeRecord(1),
    new NumbersElementTypeRecord(2),
    new NumbersElementTypeRecord(3),
    new NumbersElementTypeRecord(4)
);
 
// Standalone function call:
Result<CrossMultiplyRecord> r1 = 
    crossMultiply(configuration, numbers);
 
// Embedded table-valued function call, with predicate
Result<CrossMultiplyRecord> r2 = 
DSL.using(configuration)
   .selectFrom(crossMultiply(numbers))
   .where(F_CROSS_MULTIPLY.PRODUCT.gt(5))
   .fetch();
 
System.out.println(r1);
System.out.println(r2);

+----+----+-------+
|  i1|  i2|product|
+----+----+-------+
|   1|   1|      1|
|   2|   1|      2|
|   3|   1|      3|
|   4|   1|      4|
|   1|   2|      2|
|   2|   2|      4|
|   3|   2|      6|
|   4|   2|      8|
|   1|   3|      3|
|   2|   3|      6|
|   3|   3|      9|
|   4|   3|     12|
|   1|   4|      4|
|   2|   4|      8|
|   3|   4|     12|
|   4|   4|     16|
+----+----+-------+

+----+----+-------+
|  i1|  i2|product|
+----+----+-------+
|   3|   2|      6|
|   4|   2|      8|
|   2|   3|      6|
|   3|   3|      9|
|   4|   3|     12|
|   2|   4|      8|
|   3|   4|     12|
|   4|   4|     16|
+----+----+-------+

Not only does jOOQ understand table-valued parameters, since jOOQ 3.5, we have also supported table-valued functions, which can be used like any ordinary table:

Result<CrossMultiplyRecord> r2 = 
DSL.using(configuration)
   .selectFrom(crossMultiply(numbers))
   .where(F_CROSS_MULTIPLY.PRODUCT.gt(5))
   .fetch();

Excellent! Let’s start using table-valued parameters!