SQLite

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains routines used for analyzing expressions and
** for generating VDBE code that evaluates expressions in SQLite.
**
** $Id: expr.c,v 1.286 2007/05/08 17:54:44 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** Return the 'affinity' of the expression pExpr if any.
**

no_mem:     
  /* Avoid leaking memory if malloc has failed. */
  sqlite3ExprDelete(pExpr);
  sqlite3ExprListDelete(pList);
  return 0;
}

/*
** If the expression list pEList contains more than iLimit elements,
** leave an error message in pParse.
*/
void sqlite3ExprListCheckLength(
  Parse *pParse,
  ExprList *pEList,
  int iLimit,
  const char *zObject
){
  if( pEList->nExpr>iLimit ){
    sqlite3ErrorMsg(pParse, "too many columns in %s", zObject);
  }
}

/*
** Delete an entire expression list.
*/
void sqlite3ExprListDelete(ExprList *pList){
  int i;
  struct ExprList_item *pItem;

**
*************************************************************************
** 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 1.224 2007/05/08 17:54:44 danielk1977 Exp $
*/

// All token codes are small integers with #defines that begin with "TK_"
%token_prefix TK_

// The type of the data attached to each token is Token.  This is also the
// default type for non-terminals.

%destructor where_opt {sqlite3ExprDelete($$);}

where_opt(A) ::= .                    {A = 0;}
where_opt(A) ::= WHERE expr(X).       {A = X;}

////////////////////////// The UPDATE command ////////////////////////////////
//
cmd ::= UPDATE orconf(R) fullname(X) SET setlist(Y) where_opt(Z).  {
  sqlite3ExprListCheckLength(pParse,Y,SQLITE_MAX_COLUMN,"set list"); 
  sqlite3Update(pParse,X,Y,Z,R);
}

%type setlist {ExprList*}
%destructor setlist {sqlite3ExprListDelete($$);}

setlist(A) ::= setlist(Z) COMMA nm(X) EQ expr(Y).
    {A = sqlite3ExprListAppend(Z,Y,&X);}
setlist(A) ::= nm(X) EQ expr(Y).   {A = sqlite3ExprListAppend(0,Y,&X);}

idxlist(A) ::= idxlist(X) COMMA idxitem(Y) collate(C) sortorder(Z).  {
  Expr *p = 0;
  if( C.n>0 ){
    p = sqlite3Expr(TK_COLUMN, 0, 0, 0);
    if( p ) p->pColl = sqlite3LocateCollSeq(pParse, (char*)C.z, C.n);
  }
  A = sqlite3ExprListAppend(X, p, &Y);
  sqlite3ExprListCheckLength(pParse, A, SQLITE_MAX_COLUMN, "index");
  if( A ) A->a[A->nExpr-1].sortOrder = Z;
}
idxlist(A) ::= idxitem(Y) collate(C) sortorder(Z). {
  Expr *p = 0;
  if( C.n>0 ){
    p = sqlite3Expr(TK_COLUMN, 0, 0, 0);
    if( p ) p->pColl = sqlite3LocateCollSeq(pParse, (char*)C.z, C.n);
  }
  A = sqlite3ExprListAppend(0, p, &Y);
  sqlite3ExprListCheckLength(pParse, A, SQLITE_MAX_COLUMN, "index");
  if( A ) A->a[A->nExpr-1].sortOrder = Z;
}
idxitem(A) ::= nm(X).              {A = X;}

%type collate {Token}
collate(C) ::= .                {C.z = 0; C.n = 0;}
collate(C) ::= COLLATE id(X).   {C = X;}

/*
** 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 1.560 2007/05/08 17:54:44 danielk1977 Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_
#include "limits.h"


#if defined(SQLITE_TCL) || defined(TCLSH)

int sqlite3VtabCallCreate(sqlite3*, int, const char *, char **);
int sqlite3VtabCallConnect(Parse*, Table*);
int sqlite3VtabCallDestroy(sqlite3*, int, const char *);
int sqlite3VtabBegin(sqlite3 *, sqlite3_vtab *);
FuncDef *sqlite3VtabOverloadFunction(FuncDef*, int nArg, Expr*);
void sqlite3InvalidFunction(sqlite3_context*,int,sqlite3_value**);
int sqlite3Reprepare(Vdbe*);
void sqlite3ExprListCheckLength(Parse*, ExprList*, int, const char*);

u32 sqlite3Get2byte(const u8*);
u32 sqlite3Get4byte(const u8*);
void sqlite3Put2byte(u8*, u32);
void sqlite3Put4byte(u8*, u32);

#ifdef SQLITE_SSE

#    May you share freely, never taking more than you give.
#
#***********************************************************************
#
# This file contains tests to verify that the limits defined in
# sqlite source file limits.h are enforced.
#
# $Id: sqllimits1.test,v 1.3 2007/05/08 17:54:44 danielk1977 Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

#--------------------------------------------------------------------
# Test cases sqllimits-1.* test that the SQLITE_MAX_LENGTH limit
# is enforced.

#
do_test sqllimits-3.1 {
  execsql {
    PRAGMA max_page_count = 1000;
  }
} {1000}
do_test sqllimits-3.2 {

  execsql { CREATE TABLE trig (a INTEGER, b INTEGER); }


  # Set up a tree of triggers to fire when a row is inserted
  # into table "trig".
  #
  # INSERT -> insert_b -> update_b -> insert_a -> update_a      (chain 1)
  #                    -> update_a -> insert_a -> update_b      (chain 2)
  #        -> insert_a -> update_b -> insert_b -> update_a      (chain 3)

do_test sqllimits1-3.6 {
  catchsql {
    SELECT COUNT(*) FROM trig;
  }
} {0 7}


#--------------------------------------------------------------------
# Test cases sqllimits1-4.* test the SQLITE_MAX_COLUMN limit.
#
do_test sqllimits-1.4.1 {
  set cols [list]
  for {set i 0} {$i <= $SQLITE_MAX_COLUMN} {incr i} {
    lappend cols "c$i"
  }
  catchsql "CREATE TABLE t([join $cols ,])" 
} {1 {too many columns on t}}

do_test sqllimits-1.4.2 {
  set cols [list]
  for {set i 0} {$i <= $SQLITE_MAX_COLUMN} {incr i} {
    lappend cols "sql AS sql$i"
  }
  catchsql "SELECT [join $cols ,] FROM sqlite_master"
} {1 {too many columns in result set}}

do_test sqllimits-1.4.3 {
  set cols [list]
  for {set i 0} {$i <= $SQLITE_MAX_COLUMN} {incr i} {
    lappend cols "sql AS sql$i"
  }
  catchsql "SELECT sql4 FROM (SELECT [join $cols ,] FROM sqlite_master)"
} {1 {too many columns in result set}}

do_test sqllimits-1.4.4 {
  set cols [list]
  for {set i 0} {$i <= $SQLITE_MAX_COLUMN} {incr i} {
    lappend cols c
  }
  set sql1 "CREATE TABLE t1(c);"
  set sql2 "CREATE INDEX i1 ON t1([join $cols ,]);"
  catchsql "$sql1 ; $sql2"
} {1 {too many columns in index}}

do_test sqllimits-1.4.5 {
  catchsql "SELECT * FROM t1 GROUP BY [join $cols ,]"
} {1 {too many terms in GROUP BY clause}}

do_test sqllimits-1.4.6 {
  catchsql "SELECT * FROM t1 ORDER BY [join $cols ,]"
} {1 {too many terms in ORDER BY clause}}

do_test sqllimits-1.4.7 {
  set cols [list]
  for {set i 0} {$i <= $SQLITE_MAX_COLUMN} {incr i} {
    lappend cols "c = 1"
  }
  catchsql "UPDATE t1 SET [join $cols ,];"
} {1 {too many columns in set list}}

finish_test