Array of fields to update to an expression in case of a duplicate record.
This variable is a nested array in the following format:
<some field> => array( 'condition' => <condition to execute, as a string>, 'arguments' => <array of arguments for condition, or NULL for none>, );
includes/ database/ query.inc, line 1329
- Non-specific Database query code. Used by all engines.
- General class for an abstracted MERGE query operation.
protected $expressionFields = array();