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IF EXISTS

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

For idempotent execution of DDL scripts, the useful IF EXISTS clause is supported by jOOQ, and emulated using an anonymous, procedural block if possible.

// Drop a sequence
create.dropSequenceIfExists("sequence").execute();

Dialect support

This example using jOOQ:

dropSequenceIfExists("sequence")

Translates to the following dialect specific expressions:

Aurora Postgres, CockroachDB, H2, HSQLDB, Informix, MariaDB, Oracle, Postgres, Snowflake, Vertica, YugabyteDB

DROP SEQUENCE IF EXISTS sequence

DB2

BEGIN
  DECLARE CONTINUE HANDLER FOR SQLSTATE '42704' BEGIN END;
  EXECUTE IMMEDIATE '
    DROP SEQUENCE sequence
  ';
END

Firebird

EXECUTE BLOCK
AS
BEGIN
  EXECUTE STATEMENT '
    DROP SEQUENCE sequence
  ';
  WHEN sqlcode -607 DO
    BEGIN END
END

Hana

DO BEGIN
  DECLARE EXIT HANDLER FOR SQL_ERROR_CODE 313 BEGIN END;
  EXECUTE IMMEDIATE '
    DROP SEQUENCE sequence
  ';
END;

SQLServer

BEGIN TRY
  DROP SEQUENCE sequence
END TRY
BEGIN CATCH
  IF error_number() != 3701 THROW;
END CATCH

Sybase

BEGIN
  DROP SEQUENCE sequence;
EXCEPTION
  WHEN others THEN
END;BEGIN
DROP SEQUENCE sequence
';
WHEN sqlcode -607 DO
BEGIN END
END;

ASE, Access, Aurora MySQL, BigQuery, Derby, DuckDB, Exasol, MemSQL, MySQL, Redshift, SQLDataWarehouse, SQLite, Teradata, Trino

/* UNSUPPORTED */

(These are currently generated with jOOQ 3.20, see #10141), or translate your own on our website

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