SQLite

** using the DECLARE...CURSOR command and deleted using CLOSE.  A
** B-tree cursor is an abstraction of the b-tree layer.  See the btree.c
** module for additional information.  There is also a VDBE-cursor that
** is used by the VDBE module.  Even though all these objects are called
** cursors, they are really very different things.  It is worth your while
** to fully understand the difference.
**
** @(#) $Id: cursor.c,v 1.3 2005/01/20 02:14:31 drh Exp $
*/

#include "sqliteInt.h"
#ifndef SQLITE_OMIT_CURSOR
#include "vdbeInt.h"

/*
** Delete a cursor object.
*/
void sqlite3CursorDelete(SqlCursor *p){
  if( p ){

**
*************************************************************************
** This file contains SQLite's grammar for SQL.  Process this file
** using the lemon parser generator to generate C code that runs
** the parser.  Lemon will also generate a header file containing
** numeric codes for all of the tokens.
**
** @(#) $Id: parse.y,v 1.160 2005/01/20 02:14:31 drh Exp $
*/
%token_prefix TK_
%token_type {Token}
%default_type {Token}
%extra_argument {Parse *pParse}
%syntax_error {
  if( pParse->zErrMsg==0 ){

  Expr *temp4 = sqlite3Expr(TK_DOT, temp2, temp3, 0);
  A = sqlite3Expr(TK_DOT, temp1, temp4, 0);
}
term(A) ::= INTEGER(X).      {A = sqlite3Expr(@X, 0, 0, &X);}
term(A) ::= FLOAT(X).        {A = sqlite3Expr(@X, 0, 0, &X);}
term(A) ::= STRING(X).       {A = sqlite3Expr(@X, 0, 0, &X);}
expr(A) ::= BLOB(X).         {A = sqlite3Expr(@X, 0, 0, &X);}
%ifdef SQLITE_ENABLE_CURSOR
expr(A) ::= CURRENT OF id.
%endif 
expr(A) ::= REGISTER(X).     {A = sqlite3RegisterExpr(pParse, &X);}
expr(A) ::= VARIABLE(X).     {
  Token *pToken = &X;
  Expr *pExpr = A = sqlite3Expr(TK_VARIABLE, 0, 0, pToken);
  sqlite3ExprAssignVarNumber(pParse, pExpr);

%ifndef SQLITE_OMIT_ALTERTABLE
cmd ::= ALTER TABLE fullname(X) RENAME TO nm(Z). {
  sqlite3AlterRenameTable(pParse,X,&Z);
}
%endif

////////////////////////////// CURSORS //////////////////////////////////////
%ifdef SQLITE_ENABLE_CURSOR
cmd ::= DECLARE nm(X) CURSOR FOR select(Y).  {sqlite3CursorCreate(pParse,&X,Y);}
cmd ::= CLOSE nm(X).                         {sqlite3CursorClose(pParse,&X);}

cmd ::= FETCH direction FROM nm(N) into_opt(D).
                                      {sqlite3Fetch(pParse,&N,D);}

%type into_opt {IdList*}

%type count_opt {int}
count_opt(A) ::= .          {A = 1;}
count_opt(A) ::= signed(X). {A = X;}
%type comma_count_opt {int}
comma_count_opt(A) ::= .                 {A = 1;}
comma_count_opt(A) ::= COMMA signed(X).  {A = X;}
%endif // SQLITE_ENABLE_CURSOR

/*
** 2001 September 15
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.358 2005/01/20 02:14:31 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_

/*
** Cursor support is turned off unless the SQLITE_ENABLE_CURSOR option
** is defined.
*/
#ifndef SQLITE_ENABLE_CURSOR
# define SQLITE_OMIT_CURSOR 1
#endif

/*
** These #defines should enable >2GB file support on Posix if the
** underlying operating system supports it.  If the OS lacks
** large file support, or if the OS is windows, these should be no-ops.
**
** Large file support can be disabled using the -DSQLITE_DISABLE_LFS switch
** on the compiler command line.  This is necessary if you are compiling