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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 schema
create.dropSchemaIfExists("schema").execute();
Dialect support
This example using jOOQ:
dropSchemaIfExists("schema")
Translates to the following dialect specific expressions:
-- AURORA_POSTGRES, COCKROACHDB, DUCKDB, EXASOL, H2, HSQLDB, MARIADB, MEMSQL, MYSQL, POSTGRES, REDSHIFT, SNOWFLAKE,
-- VERTICA, YUGABYTEDB
DROP SCHEMA IF EXISTS schema
-- DB2
BEGIN
DECLARE CONTINUE HANDLER FOR SQLSTATE '42704' BEGIN END;
EXECUTE IMMEDIATE '
DROP SCHEMA schema RESTRICT
';
END
-- HANA
DO BEGIN
DECLARE EXIT HANDLER FOR SQL_ERROR_CODE 362 BEGIN END;
EXECUTE IMMEDIATE '
DROP SCHEMA schema
';
END;
-- ORACLE
DROP USER IF EXISTS schema
-- SQLDATAWAREHOUSE
BEGIN TRY
DROP SCHEMA schema
END TRY
BEGIN CATCH
IF error_number() != 15151 BEGIN
DECLARE @ErrorMessage NVARCHAR(4000) = ERROR_MESSAGE();
DECLARE @ErrorSeverity INT = ERROR_SEVERITY();
DECLARE @ErrorState INT = ERROR_STATE();
RAISERROR (@ErrorMessage, @ErrorSeverity, @ErrorState);
END;
END CATCH
-- SQLSERVER
BEGIN TRY
DROP SCHEMA schema
END TRY
BEGIN CATCH
IF error_number() != 15151 THROW;
END CATCH
-- ACCESS, ASE, AURORA_MYSQL, BIGQUERY, DERBY, FIREBIRD, INFORMIX, SQLITE, SYBASE, TERADATA, TRINO
/* UNSUPPORTED */
(These are currently generated with jOOQ 3.19, see #10141), or translate your own on our website
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