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 1.385 2008/07/09 01:39:44 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

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

  CollSeq *p4;

  p4 = sqlite3BinaryCompareCollSeq(pParse, pLeft, pRight);
  p5 = binaryCompareP5(pLeft, pRight, jumpIfNull);
  addr = sqlite3VdbeAddOp4(pParse->pVdbe, opcode, in2, dest, in1,
                           (void*)p4, P4_COLLSEQ);
  sqlite3VdbeChangeP5(pParse->pVdbe, p5);
  if( (p5 & SQLITE_AFF_MASK)!=SQLITE_AFF_NONE ){
    sqlite3ExprCacheAffinityChange(pParse, in1, 1);
    sqlite3ExprCacheAffinityChange(pParse, in2, 1);
  }
  return addr;
}

#if SQLITE_MAX_EXPR_DEPTH>0

    sqlite3ExprDelete(pRight);
    return 0;
  }
  pNew->op = op;
  pNew->pLeft = pLeft;
  pNew->pRight = pRight;
  pNew->iAgg = -1;
  pNew->span.z = (u8*)"";
  if( pToken ){
    assert( pToken->dyn==0 );
    pNew->span = pNew->token = *pToken;
  }else if( pLeft ){
    if( pRight ){
      if( pRight->span.dyn==0 && pLeft->span.dyn==0 ){
        sqlite3ExprSpan(pNew, &pLeft->span, &pRight->span);
      }
      if( pRight->flags & EP_ExpCollate ){
        pNew->flags |= EP_ExpCollate;
        pNew->pColl = pRight->pColl;
      }
    }
    if( pLeft->flags & EP_ExpCollate ){
      pNew->flags |= EP_ExpCollate;

  }else{
    return sqlite3Expr(db, TK_AND, pLeft, pRight, 0);
  }
}

/*
** Set the Expr.span field of the given expression to span all
** text between the two given tokens.  Both tokens must be pointing
** at the same string.
*/
void sqlite3ExprSpan(Expr *pExpr, Token *pLeft, Token *pRight){
  assert( pRight!=0 );
  assert( pLeft!=0 );
  if( pExpr && pRight->z && pLeft->z ){


    pExpr->span.z = pLeft->z;
    pExpr->span.n = pRight->n + (pRight->z - pLeft->z);



  }
}

/*
** Construct a new expression node for a function with multiple
** arguments.
*/

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle SELECT statements in SQLite.
**
** $Id: select.c,v 1.452 2008/07/09 01:39:44 drh Exp $
*/
#include "sqliteInt.h"


/*
** Delete all the content of a Select structure but do not deallocate
** the select structure itself.

  int regResult;              /* Start of memory holding result set */
  int eDest = pDest->eDest;   /* How to dispose of results */
  int iParm = pDest->iParm;   /* First argument to disposal method */
  int nResultCol;             /* Number of result columns */

  if( v==0 ) return;
  assert( pEList!=0 );




  hasDistinct = distinct>=0;
  if( pOrderBy==0 && !hasDistinct ){
    codeOffset(v, p, iContinue);
  }

  /* Pull the requested columns.
  */
  if( nColumn>0 ){

      break;
    }
#endif
  }

  /* Jump to the end of the loop if the LIMIT is reached.
  */
  if( p->iLimit ){
    assert( pOrderBy==0 );  /* If there is an ORDER BY, the call to
                            ** pushOntoSorter() would have cleared p->iLimit */
    sqlite3VdbeAddOp2(v, OP_AddImm, p->iLimit, -1);
    sqlite3VdbeAddOp2(v, OP_IfZero, p->iLimit, iBreak);
  }
}

/*
** Given an expression list, generate a KeyInfo structure that records

  for(i=0; i<pEList->nExpr; i++){
    Expr *p;
    p = pEList->a[i].pExpr;
    if( p==0 ) continue;
    if( pEList->a[i].zName ){
      char *zName = pEList->a[i].zName;
      sqlite3VdbeSetColName(v, i, COLNAME_NAME, zName, strlen(zName));


    }else if( p->op==TK_COLUMN && pTabList ){
      Table *pTab;
      char *zCol;
      int iCol = p->iColumn;
      for(j=0; j<pTabList->nSrc && pTabList->a[j].iCursor!=p->iTable; j++){}
      assert( j<pTabList->nSrc );
      pTab = pTabList->a[j].pTab;
      if( iCol<0 ) iCol = pTab->iPKey;
      assert( iCol==-1 || (iCol>=0 && iCol<pTab->nCol) );
      if( iCol<0 ){
        zCol = "rowid";
      }else{
        zCol = pTab->aCol[iCol].zName;
      }
      if( !shortNames && !fullNames ){
        sqlite3VdbeSetColName(v, i, COLNAME_NAME, (char*)p->span.z, p->span.n);
      }else if( fullNames || (!shortNames && pTabList->nSrc>1) ){
        char *zName = 0;
        char *zTab;
 
        zTab = pTabList->a[j].zAlias;
        if( fullNames || zTab==0 ) zTab = pTab->zName;
        zName = sqlite3MPrintf(db, "%s.%s", zTab, zCol);
        sqlite3VdbeSetColName(v, i, COLNAME_NAME, zName, P4_DYNAMIC);
      }else{
        sqlite3VdbeSetColName(v, i, COLNAME_NAME, zCol, strlen(zCol));
      }



    }else{



      sqlite3VdbeSetColName(v, i, COLNAME_NAME, (char*)p->span.z, p->span.n);
    }
  }
  generateColumnTypes(pParse, pTabList, pEList);
}

#ifndef SQLITE_OMIT_COMPOUND_SELECT
/*

# 2003 September 6
#
# 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.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this script testing the sqlite_bind API.
#
# $Id: bind.test,v 1.44 2008/07/09 01:39:44 drh Exp $
#

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

proc sqlite_step {stmt N VALS COLS} {
  upvar VALS vals

  set rc [catch {
    sqlite3_prepare $DB {
      INSERT INTO t2(a) VALUES(?1000)
    } -1 TAIL
  } msg]
  lappend rc $msg
} {1 {(1) variable number must be between ?1 and ?999}}
do_test bind-9.3.1 {
  set VM [
    sqlite3_prepare $DB {
      INSERT INTO t2(a,b) VALUES(?1,?999)
    } -1 TAIL
  ]
  sqlite3_bind_parameter_count $VM
} {999}
catch {sqlite3_finalize $VM}
do_test bind-9.3.2 {
  set VM [
    sqlite3_prepare $DB {
      INSERT INTO t2(a,b) VALUES(?2,?998)
    } -1 TAIL
  ]
  sqlite3_bind_parameter_count $VM
} {998}
catch {sqlite3_finalize $VM}
do_test bind-9.4 {
  set VM [
    sqlite3_prepare $DB {
      INSERT INTO t2(a,b,c,d) VALUES(?1,?997,?,?)
    } -1 TAIL
  ]

# 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.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing the SELECT statement.
#
# $Id: select1.test,v 1.62 2008/07/09 01:39:44 drh Exp $

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

# Try to select on a non-existant table.
#
do_test select1-1.1 {

  lappend v $msg
} {0 {11 11 11 33 33 11 33 33}}
do_test select1-6.9.2 {
  set v [catch {execsql2 {SELECT A.f1, B.f1 FROM test1 as A, test1 as B 
         ORDER BY A.f1, B.f1}} msg]
  lappend v $msg
} {0 {f1 11 f1 11 f1 33 f1 33 f1 11 f1 11 f1 33 f1 33}}

do_test select1-6.9.3 {
  db eval {
     PRAGMA short_column_names=OFF;
     PRAGMA full_column_names=OFF;
  }
  execsql2 {
     SELECT test1 . f1, test1 . f2 FROM test1 LIMIT 1
  }
} {{test1 . f1} 11 {test1 . f2} 22}
do_test select1-6.9.4 {
  db eval {
     PRAGMA short_column_names=OFF;
     PRAGMA full_column_names=ON;
  }
  execsql2 {
     SELECT test1 . f1, test1 . f2 FROM test1 LIMIT 1
  }
} {test1.f1 11 test1.f2 22}
do_test select1-6.9.5 {
  db eval {
     PRAGMA short_column_names=OFF;
     PRAGMA full_column_names=ON;
  }
  execsql2 {
     SELECT 123.45;
  }
} {123.45 123.45}
db eval {
  PRAGMA short_column_names=ON;
  PRAGMA full_column_names=OFF;
}

ifcapable compound {
do_test select1-6.10 {
  set v [catch {execsql2 {
    SELECT f1 FROM test1 UNION SELECT f2 FROM test1
    ORDER BY f2;
  }} msg]