SQLite

/*
** CAPI3REF: SQL Trace Event Codes
** KEYWORDS: SQLITE_TRACE
**
** These constants identify classes of events that can be monitored
** using the [sqlite3_trace_v2()] tracing logic.  The third argument
** to [sqlite3_trace_v2()] 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.
**
** <dl>
** [[SQLITE_TRACE_STMT]] <dt>SQLITE_TRACE_STMT</dt>
** <dd>^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 expanded SQL text of the prepared statement or a comment that
** indicates the invocation of a trigger.
**
** [[SQLITE_TRACE_PROFILE]] <dt>SQLITE_TRACE_PROFILE</dt>
** <dd>^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]] <dt>SQLITE_TRACE_ROW</dt>
** <dd>^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]] <dt>SQLITE_TRACE_CLOSE</dt>
** <dd>^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.
** </dl>
*/
#define SQLITE_TRACE_STMT       0x01
#define SQLITE_TRACE_PROFILE    0x02
#define SQLITE_TRACE_ROW        0x04
#define SQLITE_TRACE_CLOSE      0x08

/*
** CAPI3REF: SQL Trace Hook
** METHOD: sqlite3
**
** ^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 must be one or more of the [SQLITE_TRACE]
** constants.
**
** ^Each call to either sqlite3_trace() or sqlite3_trace_v2() overrides 
** (cancels) any prior calls to sqlite3_trace() or sqlite3_trace_v2().
**
** ^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.
*/
int sqlite3_trace_v2(

    return 0;
  }
#endif
  v = pVdbe->aCounter[op];
  if( resetFlag ) pVdbe->aCounter[op] = 0;
  return (int)v;
}

/*
** Return the SQL associated with a prepared statement
*/
const char *sqlite3_sql(sqlite3_stmt *pStmt){
  Vdbe *p = (Vdbe *)pStmt;
  return p ? p->zSql : 0;
}

/*
** Return the SQL associated with a prepared statement with
** bound parameters expanded.  Space to hold the returned string is
** obtained from sqlite3_malloc().  The caller is responsible for
** freeing the returned string by passing it to sqlite3_free().
**
** The SQLITE_TRACE_SIZE_LIMIT puts an upper bound on the size of
** expanded bound parameters.
*/
char *sqlite3_expanded_sql(sqlite3_stmt *pStmt){
#ifdef SQLITE_OMIT_TRACE
  return 0;
#else
  char *z = 0;
  const char *zSql = sqlite3_sql(pStmt);
  if( zSql ){
    Vdbe *p = (Vdbe *)pStmt;
    sqlite3_mutex_enter(p->db->mutex);
    z = sqlite3VdbeExpandSql(p, zSql);
    sqlite3_mutex_leave(p->db->mutex);
  }
  return z;
#endif
}

#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
/*
** Allocate and populate an UnpackedRecord structure based on the serialized
** record in nKey/pKey. Return a pointer to the new UnpackedRecord structure
** if successful, or a NULL pointer if an OOM error is encountered.
*/

  if( !isPrepareV2 ) return;
#endif
  assert( p->zSql==0 );
  p->zSql = sqlite3DbStrNDup(p->db, z, n);
  p->isPrepareV2 = (u8)isPrepareV2;
}


































/*
** Swap all content between two VDBE structures.
*/
void sqlite3VdbeSwap(Vdbe *pA, Vdbe *pB){
  Vdbe tmp, *pTmp;
  char *zTmp;
  assert( pA->db==pB->db );

      }else if( pVar->flags & MEM_Str ){
        int nOut;  /* Number of bytes of the string text to include in output */
#ifndef SQLITE_OMIT_UTF16
        u8 enc = ENC(db);
        if( enc!=SQLITE_UTF8 ){
          memset(&utf8, 0, sizeof(utf8));
          utf8.db = db;
          if( SQLITE_NOMEM==sqlite3VdbeMemSetStr(&utf8,pVar->z,pVar->n,enc,SQLITE_STATIC)
           || SQLITE_NOMEM==sqlite3VdbeChangeEncoding(&utf8, SQLITE_UTF8)
          ){
            sqlite3StrAccumReset(&out);
            sqlite3VdbeMemRelease(&utf8);
            return 0;
          }
          pVar = &utf8;
        }