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= New Features
* Dataset#merge and related #merge_* methods have been added for the
MERGE statement. MERGE is supported on PostgreSQL 15+, Oracle,
Microsoft SQL Server, DB2, H2, HSQLDB, and Derby. You can use MERGE
to insert, update, and/or delete in a single query. You call
the #merge_* methods to setup the MERGE statement, and #merge to
execute it on the database:
ds = DB[:m1]
merge_using(:m2, i1: :i2).
merge_insert(i1: :i2, a: Sequel[:b]+11).
merge_delete{a > 30}.
merge_update(i1: Sequel[:i1]+:i2+10, a: Sequel[:a]+:b+20)
ds.merge
# MERGE INTO m1 USING m2 ON (i1 = i2)
# WHEN NOT MATCHED THEN INSERT (i1, a) VALUES (i2, (b + 11))
# WHEN MATCHED AND (a > 30) THEN DELETE
# WHEN MATCHED THEN UPDATE SET i1 = (i1 + i2 + 10), a = (a + b + 20)
On PostgreSQL, the following additional MERGE related methods are
available:
* #merge_do_nothing_when_matched
* #merge_do_nothing_when_not_matched
* A :disable_split_materialized Database option is now supported on
MySQL. This disables split_materialized support in the optimizer,
working around a bug in MariaDB 10.5+ that causes failures in
Sequel's association tests.
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