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 1.375 2008/06/24 00:32:35 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

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

  switch( p->op ){
    case TK_INTEGER: {
      rc = sqlite3GetInt32((char*)p->token.z, pValue);
      break;
    }
    case TK_UPLUS: {
      rc = sqlite3ExprIsInteger(p->pLeft, pValue);

    }
    case TK_UMINUS: {
      int v;
      if( sqlite3ExprIsInteger(p->pLeft, &v) ){
        *pValue = -v;
        rc = 1;
      }

**    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 INSERT statements in SQLite.
**
** $Id: insert.c,v 1.242 2008/06/24 00:32:35 drh Exp $
*/
#include "sqliteInt.h"

/*
** Set P4 of the most recently inserted opcode to a column affinity
** string for index pIdx. A column affinity string has one character
** for each column in the table, according to the affinity of the column:

**    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 1.434 2008/06/24 00:32:36 drh Exp $
*/
#include "sqliteInt.h"


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

  */
  v = sqlite3GetVdbe(pParse);
  if( v==0 ){
    rc = 1;
    goto multi_select_end;
  }

#if 0
  if( p->pOrderBy ){
    return multiSelectOrderBy(pParse, p, pDest, aff);
  }
#endif

  /* Create the destination temporary table if necessary
  */
  dest = *pDest;
  if( dest.eDest==SRT_EphemTab ){
    assert( p->pEList );
    assert( nSetP2<sizeof(aSetP2)/sizeof(aSetP2[0]) );
    aSetP2[nSetP2++] = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, dest.iParm, 0);
    dest.eDest = SRT_Table;
  }


















  /* Generate code for the left and right SELECT statements.
  */
  pOrderBy = p->pOrderBy;
  switch( p->op ){
    case TK_ALL: {
      if( pOrderBy==0 ){

      sqlite3VdbeResolveLabel(v, iBreak);
      sqlite3VdbeAddOp2(v, OP_Close, tab2, 0);
      sqlite3VdbeAddOp2(v, OP_Close, tab1, 0);
      break;
    }
  }

  /* Make sure all SELECTs in the statement have the same number of elements
  ** in their result sets.
  */
  assert( p->pEList && pPrior->pEList );
  if( p->pEList->nExpr!=pPrior->pEList->nExpr ){
    sqlite3ErrorMsg(pParse, "SELECTs to the left and right of %s"
      " do not have the same number of result columns", selectOpName(p->op));
    rc = 1;
    goto multi_select_end;
  }

  /* Set the number of columns in temporary tables
  */
  nCol = p->pEList->nExpr;
  while( nSetP2 ){
    sqlite3VdbeChangeP2(v, aSetP2[--nSetP2], nCol);
  }

  int savedOffset;      /* Saved value of p->iOffset */
  int labelCmpr;        /* Label for the start of the merge algorithm */
  int labelEnd;         /* Label for the end of the overall SELECT stmt */
  int j1, j2, j3;       /* Jump instructions that get retargetted */
  int op;               /* One of TK_ALL, TK_UNION, TK_EXCEPT, TK_INTERSECT */
  KeyInfo *pKeyInfo;    /* Type data for comparisons */
  int p4type;           /* P4 type used for pKeyInfo */
  u8 NotUsed;           /* Dummy variable */

  assert( p->pOrderBy!=0 );
  v = pParse->pVdbe;
  if( v==0 ) return SQLITE_NOMEM;
  labelEnd = sqlite3VdbeMakeLabel(v);
  labelCmpr = sqlite3VdbeMakeLabel(v);
  pKeyInfo = keyInfoFromExprList(pParse, p->pEList);

  }
  pPrior->pOrderBy = sqlite3ExprListDup(pParse->db, p->pOrderBy);
 
  /* Separate the left and the right query from one another
  */
  p->pPrior = 0;
  pPrior->pRightmost = 0;
  processOrderGroupBy(pParse, p, p->pOrderBy, 1, &NotUsed);
  processOrderGroupBy(pParse, pPrior, pPrior->pOrderBy, 1, &NotUsed);
  
  /* Compute the limit registers */
  computeLimitRegisters(pParse, p, labelEnd);
  if( p->iLimit ){
    regLimitA = ++pParse->nMem;
    regLimitB = ++pParse->nMem;
    sqlite3VdbeAddOp2(v, OP_Copy, p->iOffset ? p->iOffset+1 : p->iLimit,

  }

  /* Free the KeyInfo if unused.
  */
  if( p4type==P4_KEYINFO_HANDOFF ){
    sqlite3_free(pKeyInfo);
  }


  /*** TBD:  Insert subroutine calls to close cursors on incomplete
  **** subqueries ****/
  return SQLITE_OK;
}

#ifndef SQLITE_OMIT_VIEW

/*
** 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 1.725 2008/06/24 00:32:36 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_

/*
** Include the configuration header output by 'configure' if we're using the
** autoconf-based build

# 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 IN and BETWEEN operator.
#
# $Id: in.test,v 1.19 2008/01/16 18:20:42 danielk1977 Exp $

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

# Generate the test data we will need for the first squences of tests.
#
do_test in-1.0 {

} {1 {only a single result allowed for a SELECT that is part of an expression}}
do_test in-12.6 {
  catchsql {
    SELECT * FROM t2 WHERE a IN (
      SELECT a FROM t3 UNION ALL SELECT a, b FROM t2
    );
  }
} {1 {only a single result allowed for a SELECT that is part of an expression}}
do_test in-12.7 {
  catchsql {
    SELECT * FROM t2 WHERE a IN (
      SELECT a FROM t3 UNION SELECT a, b FROM t2
    );
  }
} {1 {SELECTs to the left and right of UNION do not have the same number of result columns}}

# 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 1.60 2008/06/24 12:28:04 drh Exp $

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

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

do_test select1-14.2 {
  execsql { 
    SELECT 10 IN (SELECT rowid FROM sqlite_master);
  }
} {0}

finish_test