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Overview
Comment:Performance optimization in sqlite3VdbeCloseStatement().
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SHA1: 1e96e5ec1ee617cb5b5cbdc5a2ee79c8cc35821d
User & Date: drh 2017-01-26 17:11:18
Context
2017-01-26
17:26
Remove the obsolete lastRowid cache from the sqlite3VdbeExec() for a size reduction and performance improvement. check-in: b4803184 user: drh tags: trunk
17:11
Performance optimization in sqlite3VdbeCloseStatement(). check-in: 1e96e5ec user: drh tags: trunk
16:54
Performance optimization to sqlite3_blob_read(). check-in: 7459f4b7 user: drh tags: trunk
Changes
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Changes to src/vdbeaux.c.

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** SAVEPOINT_RELEASE. If it is SAVEPOINT_ROLLBACK, then the statement
** transaction is rolled back. If eOp is SAVEPOINT_RELEASE, then the 
** statement transaction is committed.
**
** If an IO error occurs, an SQLITE_IOERR_XXX error code is returned. 
** Otherwise SQLITE_OK.
*/
int sqlite3VdbeCloseStatement(Vdbe *p, int eOp){
  sqlite3 *const db = p->db;
  int rc = SQLITE_OK;

  /* If p->iStatement is greater than zero, then this Vdbe opened a 
  ** statement transaction that should be closed here. The only exception
  ** is that an IO error may have occurred, causing an emergency rollback.
  ** In this case (db->nStatement==0), and there is nothing to do.
  */
  if( db->nStatement && p->iStatement ){
    int i;
    const int iSavepoint = p->iStatement-1;

    assert( eOp==SAVEPOINT_ROLLBACK || eOp==SAVEPOINT_RELEASE);
    assert( db->nStatement>0 );
    assert( p->iStatement==(db->nStatement+db->nSavepoint) );

................................................................................
    /* If the statement transaction is being rolled back, also restore the 
    ** database handles deferred constraint counter to the value it had when 
    ** the statement transaction was opened.  */
    if( eOp==SAVEPOINT_ROLLBACK ){
      db->nDeferredCons = p->nStmtDefCons;
      db->nDeferredImmCons = p->nStmtDefImmCons;
    }

  }




  return rc;
}


/*
** This function is called when a transaction opened by the database 
** handle associated with the VM passed as an argument is about to be 
** committed. If there are outstanding deferred foreign key constraint
** violations, return SQLITE_ERROR. Otherwise, SQLITE_OK.
**







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** SAVEPOINT_RELEASE. If it is SAVEPOINT_ROLLBACK, then the statement
** transaction is rolled back. If eOp is SAVEPOINT_RELEASE, then the 
** statement transaction is committed.
**
** If an IO error occurs, an SQLITE_IOERR_XXX error code is returned. 
** Otherwise SQLITE_OK.
*/
static SQLITE_NOINLINE int vdbeCloseStatement(Vdbe *p, int eOp){
  sqlite3 *const db = p->db;
  int rc = SQLITE_OK;







  int i;
  const int iSavepoint = p->iStatement-1;

  assert( eOp==SAVEPOINT_ROLLBACK || eOp==SAVEPOINT_RELEASE);
  assert( db->nStatement>0 );
  assert( p->iStatement==(db->nStatement+db->nSavepoint) );

................................................................................
  /* If the statement transaction is being rolled back, also restore the 
  ** database handles deferred constraint counter to the value it had when 
  ** the statement transaction was opened.  */
  if( eOp==SAVEPOINT_ROLLBACK ){
    db->nDeferredCons = p->nStmtDefCons;
    db->nDeferredImmCons = p->nStmtDefImmCons;
  }
  return rc;
}
int sqlite3VdbeCloseStatement(Vdbe *p, int eOp){
  if( p->db->nStatement && p->iStatement ){
    return vdbeCloseStatement(p, eOp);
  }
  return SQLITE_OK;
}


/*
** This function is called when a transaction opened by the database 
** handle associated with the VM passed as an argument is about to be 
** committed. If there are outstanding deferred foreign key constraint
** violations, return SQLITE_ERROR. Otherwise, SQLITE_OK.
**