REPEAT statement
Applies to ❌ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
WHILE's lesser known little sibling is REPEAT, which works the same way as Java's do statement. It is mostly not as useful as WHILE, but can be, occasionally, when a loop must be iterated at least once.
An example:
-- MySQL syntax REPEAT INSERT INTO t (col) VALUES (i); SET i = i + 1; UNTIL i > 10 END REPEAT;
// All dialects
Variable<Integer> i = var("i", INTEGER);
repeat(
insertInto(T).columns(T.COL).values(i),
i.set(i.plus(1))
).until(i.gt(10))
Dialect support
This example using jOOQ:
repeat(deleteFrom(BOOK).where(BOOK.ID.eq(i)), i.set(i.plus(1))).until(i.gt(10))
Translates to the following dialect specific expressions:
-- AURORA_POSTGRES
<<alias_2>>
LOOP
DELETE FROM BOOK
WHERE BOOK.ID = i;
SET i = (i + 1);
EXIT alias_2 WHEN i > 10;
END LOOP
-- BIGQUERY, DB2, HSQLDB, MARIADB, MYSQL
REPEAT
DELETE FROM BOOK
WHERE BOOK.ID = i;
SET i = (i + 1);
UNTIL i > 10 END REPEAT
-- EXASOL
REPEAT
DELETE FROM BOOK
WHERE BOOK.ID = i;
i := (i + 1);
UNTIL i > 10 END REPEAT
-- FIREBIRD
alias_2:
WHILE (1 = 1) DO BEGIN
DELETE FROM BOOK
WHERE BOOK.ID = :i;
:i = (:i + 1);
IF (:i > 10) THEN
LEAVE alias_2;
END
-- H2
do {
try (PreparedStatement s = c.prepareStatement(
"DELETE FROM BOOK\n" +
"WHERE BOOK.ID = ?"
)) {
s.setObject(1, i);
s.execute();
}
i = (i + 1);
}
while (!(i > 10))
-- HANA
WHILE 1 = 1 DO
DELETE FROM BOOK
WHERE BOOK.ID = i;
i = (i + 1);
IF i > 10 THEN
BREAK;
END IF;
END WHILE
-- INFORMIX
<<alias_2>>
LOOP
DELETE FROM BOOK
WHERE BOOK.ID = i;
LET i = (i + 1);
EXIT alias_2 WHEN i > 10;
END LOOP
-- ORACLE, POSTGRES, YUGABYTEDB
<<alias_2>>
LOOP
DELETE FROM BOOK
WHERE BOOK.ID = i;
i := (i + 1);
EXIT alias_2 WHEN i > 10;
END LOOP
-- ACCESS, ASE, AURORA_MYSQL, COCKROACHDB, DERBY, MEMSQL, REDSHIFT, SNOWFLAKE, SQLDATAWAREHOUSE, SQLITE, SQLSERVER,
-- SYBASE, TERADATA, TRINO, VERTICA
/* UNSUPPORTED */
(These are currently generated with jOOQ 3.19, see #10141), or translate your own on our website
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