Available in versions: Dev (3.19) | Latest (3.18) | 3.17 | 3.16 | 3.15

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 trigger
create.dropTriggerIfExists("trg").execute();

Dialect support

This example using jOOQ:

dropTriggerIfExists("type")

Translates to the following dialect specific expressions:

-- DB2
BEGIN
  DECLARE CONTINUE HANDLER FOR SQLSTATE '42704' BEGIN END;
  EXECUTE IMMEDIATE '
    DROP TRIGGER type
  ';
END

-- FIREBIRD
EXECUTE BLOCK
AS
BEGIN
  EXECUTE STATEMENT '
    DROP TRIGGER type
  ';
  WHEN sqlcode -607 DO
    BEGIN END
END

-- INFORMIX, MARIADB, MYSQL, ORACLE, SQLSERVER
DROP TRIGGER IF EXISTS type

-- POSTGRES
DO $$
BEGIN
  DROP FUNCTION IF EXISTS type_function;
  DROP TRIGGER IF EXISTS type;
END;
$$

-- ACCESS, ASE, AURORA_MYSQL, AURORA_POSTGRES, BIGQUERY, COCKROACHDB, DERBY, DUCKDB, EXASOL, H2, HANA, HSQLDB, MEMSQL, 
-- REDSHIFT, SNOWFLAKE, SQLDATAWAREHOUSE, SQLITE, SYBASE, TERADATA, TRINO, VERTICA, YUGABYTEDB
/* UNSUPPORTED */

(These are currently generated with jOOQ 3.19, see #10141), or translate your own on our website

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