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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 view
create.dropViewIfExists("view").execute();

Dialect support

This example using jOOQ:

dropViewIfExists("v")

Translates to the following dialect specific expressions:

Access

DROP VIEW v

Aurora MySQL, Aurora Postgres, BigQuery, CockroachDB, DuckDB, Exasol, H2, HSQLDB, Informix, MariaDB, MemSQL, MySQL, Oracle, Postgres, SQLite, Sybase, Trino, Vertica, YugabyteDB

DROP VIEW IF EXISTS v

DB2

BEGIN
  DECLARE CONTINUE HANDLER FOR SQLSTATE '42704' BEGIN END;
  EXECUTE IMMEDIATE '
    DROP VIEW v
  ';
END

Firebird

EXECUTE BLOCK
AS
BEGIN
  EXECUTE STATEMENT '
    DROP VIEW v
  ';
  WHEN sqlcode -607 DO
    BEGIN END
END

Hana

DO BEGIN
  DECLARE EXIT HANDLER FOR SQL_ERROR_CODE 321 BEGIN END;
  EXECUTE IMMEDIATE '
    DROP VIEW v
  ';
END;

SQLDataWarehouse

BEGIN TRY
  DROP VIEW v
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

SQLServer

BEGIN TRY
  DROP VIEW v
END TRY
BEGIN CATCH
  IF error_number() != 3701 THROW;
END CATCH

ASE, Derby, Redshift, Snowflake, Teradata

/* UNSUPPORTED */

(These are currently generated with jOOQ 3.20, see #10141), or translate your own on our website

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