Installs debug trace callback
This function installs a trace callback handler. func is a Lua function that is called by SQLite3 just before the evaluation of an SQL statement. This callback receives two arguments: the first is the udata argument used when the callback was installed; the second is a string with the SQL statement about to be executed.
See Also ...
context:aggregate_count - Returns the number of calls to the aggregate step function.
(Help topic: lua=db:trace)
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