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int sqlite3_trace_v2( sqlite3*, unsigned uMask, int(*xCallback)(unsigned,void*,void*,void*), void *pCtx );
The sqlite3_trace_v2(D,M,X,P) interface registers a trace callback function X against database connection D, using property mask M and context pointer P. If the X callback is NULL or if the M mask is zero, then tracing is disabled. The M argument should be the bitwise OR-ed combination of zero or more SQLITE_TRACE constants.
Each call to either sqlite3_trace(D,X,P) or sqlite3_trace_v2(D,M,X,P) overrides (cancels) all prior calls to sqlite3_trace(D,X,P) or sqlite3_trace_v2(D,M,X,P) for the database connection D. Each database connection may have at most one trace callback.
The X callback is invoked whenever any of the events identified by mask M occur. The integer return value from the callback is currently ignored, though this may change in future releases. Callback implementations should return zero to ensure future compatibility.
A trace callback is invoked with four arguments: callback(T,C,P,X). The T argument is one of the SQLITE_TRACE constants to indicate why the callback was invoked. The C argument is a copy of the context pointer. The P and X arguments are pointers whose meanings depend on T.
The sqlite3_trace_v2() interface is intended to replace the legacy interfaces sqlite3_trace() and sqlite3_profile(), both of which are deprecated.