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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.
// 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;
-- ACCESS, ASE, AURORA_MYSQL, BIGQUERY, DERBY, DUCKDB, EXASOL, MEMSQL, MYSQL, REDSHIFT, SQLDATAWAREHOUSE, SQLITE,
-- TERADATA, TRINO
/* UNSUPPORTED */
(These are currently generated with jOOQ 3.19, see #10141), or translate your own on our website
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