DB2 Grammar for Upsert

[jonkerw85]

Added the upsert functionality (Laravel 8.10 in, https://laravel-news.com/laravel-8-10-0) for de DB2 driver.

Source :

• https://github.com/laravel/framework/blob/338ffa625e4b16ccd3d3481371c9312a245fdc30/src/Illuminate/Database/Query/Grammars/SqlServerGrammar.php
• https://nandaibmi.com/index.php/2019/04/16/db2-upsert-using-merge-into/

Resulting SQL (don't mind table and column names. This database was written in a time DB2 had length limitations on names for columns and tables)

SQL Example :

merge INTO trbpar AS temp
USING (VALUES (CAST(? AS VARCHAR(1)), CAST(? AS VARCHAR(5)), CAST(? AS VARCHAR(2)), CAST(? AS VARCHAR(8)), CAST(? AS VARCHAR(5)), CAST(? AS VARCHAR(1)), CAST(? AS VARCHAR(4)), CAST(? AS VARCHAR(6)), CAST(? AS VARCHAR(5)), CAST(? AS VARCHAR(1)), CAST(? AS VARCHAR(1)), CAST(? AS VARCHAR(1)))) AS merge (tbea#mv, tbeat#, tbebdfam, tbed#i, tbema#, tbemts, tbepn#, tbet#i, tbeusri, tbey#1, tbey#po, tbey#u)
ON temp.tbebdfam = merge.tbebdfam
AND temp.tbepn# = merge.tbepn#
AND temp.tbema# = merge.tbema#
WHEN matched THEN
UPDATE SET temp.tbea#mv = merge.tbea#mv,
temp.tbebdfam = merge.tbebdfam,
temp.tbeusri = merge.tbeusri,
temp.tbepn# = merge.tbepn#,
temp.tbemts = merge.tbemts,
temp.tbey#u = merge.tbey#u,
temp.tbey#po = merge.tbey#po,
temp.tbey#1 = merge.tbey#1,
temp.tbed#i = merge.tbed#i,
temp.tbet#i = merge.tbet#i,
temp.tbema# = merge.tbema#,
temp.tbeat# = merge.tbeat#
WHEN NOT matched THEN
INSERT (tbea#mv,
tbeat#,
tbebdfam,
tbed#i,
tbema#,
tbemts,
tbepn#,
tbet#i,
tbeusri,
tbey#1,
tbey#po,
tbey#u)
VALUES (merge.tbea#mv,
merge.tbeat#,
merge.tbebdfam,
merge.tbed#i,
merge.tbema#,
merge.tbemts,
merge.tbepn#,
merge.tbet#i,
merge.tbeusri,
merge.tbey#1,
merge.tbey#po,
merge.tbey#u)