write_lobs fix: handle table with composite primary key

[dsusco]

I ran into this issue trying to update a CLOB attribute in a table with a composite primary key. The SELECT FOR UPDATE statement was just dumping the comma delimited primary key into the where clause:

WHERE 'column_a,column_b' = "I'm in the mood to help you dude..."

I added a check for an array of primary keys, and if found built the id conditions up.

[stale[bot]]

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