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