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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 table
create.dropTableIfExists("table").execute();
Dialect support
This example using jOOQ:
dropTableIfExists("table")
Translates to the following dialect specific expressions:
-- ACCESS
DROP TABLE table
-- AURORA_MYSQL, AURORA_POSTGRES, COCKROACHDB, DUCKDB, EXASOL, H2, HSQLDB, INFORMIX, MARIADB, MEMSQL, MYSQL, ORACLE,
-- POSTGRES, SNOWFLAKE, SYBASE, VERTICA, YUGABYTEDB
DROP TABLE IF EXISTS table
-- DB2
BEGIN
DECLARE CONTINUE HANDLER FOR SQLSTATE '42704' BEGIN END;
EXECUTE IMMEDIATE '
DROP TABLE table
';
END
-- FIREBIRD
EXECUTE BLOCK
AS
BEGIN
EXECUTE STATEMENT '
DROP TABLE table
';
WHEN sqlcode -607 DO
BEGIN END
END
-- HANA
DO BEGIN
DECLARE EXIT HANDLER FOR SQL_ERROR_CODE 259 BEGIN END;
EXECUTE IMMEDIATE '
DROP TABLE table
';
END;
-- SQLDATAWAREHOUSE
BEGIN TRY
DROP TABLE table
END TRY
BEGIN CATCH
IF error_number() != 3701 BEGIN
DECLARE @ErrorMessage NVARCHAR(4000) = ERROR_MESSAGE();
DECLARE @ErrorSeverity INT = ERROR_SEVERITY();
DECLARE @ErrorState INT = ERROR_STATE();
RAISERROR (@ErrorMessage, @ErrorSeverity, @ErrorState);
END;
END CATCH
-- SQLITE
DROP TABLE IF EXISTS "table"
-- SQLSERVER
BEGIN TRY
DROP TABLE table
END TRY
BEGIN CATCH
IF error_number() != 3701 THROW;
END CATCH
-- ASE, BIGQUERY, DERBY, REDSHIFT, TERADATA, TRINO
/* UNSUPPORTED */
(These are currently generated with jOOQ 3.19, see #10141), or translate your own on our website
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