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CREATE SEQUENCE IF NOT EXISTS

Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition

A popular subclause of DDL statements that jOOQ can usually emulate, is the IF NOT EXISTS clause:

Dialect support

This example using jOOQ:

createSequenceIfNotExists("s")

Translates to the following dialect specific expressions:

CREATE SEQUENCE IF NOT EXISTS s

BEGIN
  DECLARE CONTINUE HANDLER FOR SQLSTATE '42710' BEGIN END;
  EXECUTE IMMEDIATE '
    CREATE SEQUENCE s
  ';
END

EXECUTE BLOCK
AS
BEGIN
  EXECUTE STATEMENT '
    CREATE SEQUENCE s
  ';
  WHEN sqlcode -607 DO
    BEGIN END
END

DO BEGIN
  DECLARE EXIT HANDLER FOR SQL_ERROR_CODE 324 BEGIN END;
  EXECUTE IMMEDIATE '
    CREATE SEQUENCE s
  ';
END;

BEGIN TRY
  CREATE SEQUENCE s START WITH 1
END TRY
BEGIN CATCH
  IF error_number() != 2714 THROW;
END CATCH

BEGIN
  CREATE SEQUENCE s;
EXCEPTION
  WHEN others THEN
END;

/* UNSUPPORTED */

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