N°7636 - Too many OQL requests executed in order to display a lnk

[accognet]

Improve performance of displaying links on screen

Currently when displaying a user query, displaying a lnk requires 5 sql queries :

After the PR, the same lnk only requires 2 SQL queries:

In total on the screen, the gain is 12 requests:
before:

after:

[rquetiez]

Today's review:

• Count set by default to -1... that's pretty unusual, why not use null instead?
• Add tests in DBObjectTest, based on AssertDBQueryCount, to show what is being improved at the lowest possible level
• Using DBObject::GetValues() is not recommended as compared to DBObject::Get(). The former does not give the same results (e.g. lazy loading will lead to missing keys in the array).
• Improving DBObject::Get() could be preferable, -depending on fix. The root cause that has to be further clarified, with the help of unit tests

[rquetiez]

Code review:

• Requesting rollback on the optimization of MetaModel::GetHyperlink
• Rename iCount into object_count in the extra params
• Tests to simplify a little (no need to test GetValue)

[rquetiez]

Code review : ok for merging