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Choose any three.
#define SQLITE_TRACE_STMT 0x01
#define SQLITE_TRACE_PROFILE 0x02
#define SQLITE_TRACE_ROW 0x04
#define SQLITE_TRACE_CLOSE 0x08
These constants identify classes of events that can be monitored
using the sqlite3_trace_v2() tracing logic. The M argument
to sqlite3_trace_v2(D,M,X,P) is an OR-ed combination of one or more of
the following constants. The first argument to the trace callback
is one of the following constants.
New tracing constants may be added in future releases.
A trace callback has four arguments: xCallback(T,C,P,X).
The T argument is one of the integer type codes above.
The C argument is a copy of the context pointer passed in as the
fourth argument to sqlite3_trace_v2().
The P and X arguments are pointers whose meanings depend on T.
- SQLITE_TRACE_STMT
- An SQLITE_TRACE_STMT callback is invoked when a prepared statement
first begins running and possibly at other times during the
execution of the prepared statement, such as at the start of each
trigger subprogram. The P argument is a pointer to the
prepared statement. The X argument is a pointer to a string which
is the unexpanded SQL text of the prepared statement or an SQL comment
that indicates the invocation of a trigger. The callback can compute
the same text that would have been returned by the legacy sqlite3_trace()
interface by using the X argument when X begins with "--" and invoking
sqlite3_expanded_sql(P) otherwise.
- SQLITE_TRACE_PROFILE
- An SQLITE_TRACE_PROFILE callback provides approximately the same
information as is provided by the sqlite3_profile() callback.
The P argument is a pointer to the prepared statement and the
X argument points to a 64-bit integer which is the estimated of
the number of nanosecond that the prepared statement took to run.
The SQLITE_TRACE_PROFILE callback is invoked when the statement finishes.
- SQLITE_TRACE_ROW
- An SQLITE_TRACE_ROW callback is invoked whenever a prepared
statement generates a single row of result.
The P argument is a pointer to the prepared statement and the
X argument is unused.
- SQLITE_TRACE_CLOSE
- An SQLITE_TRACE_CLOSE callback is invoked when a database
connection closes.
The P argument is a pointer to the database connection object
and the X argument is unused.
See also lists of
Objects,
Constants, and
Functions.