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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 domain
create.dropDomainIfExists("d").execute();

Dialect support

This example using jOOQ:

dropDomainIfExists("d")

Translates to the following dialect specific expressions:

Aurora Postgres, H2, HSQLDB, Oracle, Postgres, YugabyteDB

DROP DOMAIN IF EXISTS d

Firebird

EXECUTE BLOCK
AS
BEGIN
  EXECUTE STATEMENT '
    DROP DOMAIN d
  ';
  WHEN sqlcode -607 DO
    BEGIN END
END

SQLServer

DROP TYPE IF EXISTS d

ASE, Access, Aurora MySQL, BigQuery, CockroachDB, DB2, Derby, DuckDB, Exasol, Hana, Informix, MariaDB, MemSQL, MySQL, Redshift, SQLDataWarehouse, SQLite, Snowflake, Sybase, Teradata, Trino, Vertica

/* UNSUPPORTED */

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

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