SQLite

**    May you share freely, never taking more than you give.
**
*************************************************************************
** Code for testing the virtual table interfaces.  This code
** is not included in the SQLite library.  It is used for automated
** testing of the SQLite library.
**
** $Id: test8.c,v 1.18 2006/06/14 22:07:11 drh Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
#include "os.h"
#include <stdlib.h>
#include <string.h>

        case SQLITE_INDEX_CONSTRAINT_GT:
          zOp = ">"; break;
        case SQLITE_INDEX_CONSTRAINT_LE:
          zOp = "<="; break;
        case SQLITE_INDEX_CONSTRAINT_GE:
          zOp = ">="; break;
        case SQLITE_INDEX_CONSTRAINT_MATCH:
          zOp = "LIKE"; break;
      }
      if( zOp[0]=='L' ){
        zNew = sqlite3_mprintf("%s %s %s LIKE (SELECT '%%'||?||'%%')", 
                               zQuery, zSep, zCol);
      } else {
        zNew = sqlite3_mprintf("%s %s %s %s ?", zQuery, zSep, zCol, zOp);
      }
      sqlite3_free(zQuery);
      zQuery = zNew;
      zSep = "AND";
      pUsage->argvIndex = ++nArg;
      pUsage->omit = 1;
    }
  }

** This module contains C code that generates VDBE code used to process
** the WHERE clause of SQL statements.  This module is reponsible for
** generating the code that loops through a table looking for applicable
** rows.  Indices are selected and used to speed the search when doing
** so is applicable.  Because this module is responsible for selecting
** indices, you might also think of this module as the "query optimizer".
**
** $Id: where.c,v 1.218 2006/06/14 22:07:11 drh Exp $
*/
#include "sqliteInt.h"

/*
** The number of bits in a Bitmask.  "BMS" means "BitMask Size".
*/
#define BMS  (sizeof(Bitmask)*8)

    Bitmask prereqColumn, prereqExpr;

    pRight = pExpr->pList->a[0].pExpr;
    pLeft = pExpr->pList->a[1].pExpr;
    prereqExpr = exprTableUsage(pMaskSet, pRight);
    prereqColumn = exprTableUsage(pMaskSet, pLeft);
    if( (prereqExpr & prereqColumn)==0 ){
      Expr *pNewExpr;
      pNewExpr = sqlite3Expr(TK_MATCH, 0, sqlite3ExprDup(pRight), 0);
      idxNew = whereClauseInsert(pWC, pNewExpr, TERM_VIRTUAL|TERM_DYNAMIC);
      pNewTerm = &pWC->a[idxNew];
      pNewTerm->prereqRight = prereqExpr;
      pNewTerm->leftCursor = pLeft->iTable;
      pNewTerm->leftColumn = pLeft->iColumn;
      pNewTerm->eOperator = WO_MATCH;
      pNewTerm->iParent = idxTerm;
      pTerm = &pWC->a[idxNew];

      assert( pTabItem->pTab );
#ifndef SQLITE_OMIT_VIRTUALTABLE
      if( IsVirtual(pTabItem->pTab) ){
        cost = bestVirtualIndex(pParse, &wc, pTabItem, notReady,
                                ppOrderBy ? *ppOrderBy : 0, i==0,
                                &pLevel->pIdxInfo);
        flags = WHERE_VIRTUALTABLE;
        if( pLevel->pIdxInfo && pLevel->pIdxInfo->orderByConsumed ){
          flags = WHERE_VIRTUALTABLE | WHERE_ORDERBY;
        }
        pIdx = 0;
        nEq = 0;
      }else 
#endif
      {
        cost = bestIndex(pParse, &wc, pTabItem, notReady,
                         (i==0 && ppOrderBy) ? *ppOrderBy : 0,

# 2006 June 10
#
# 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 creating and dropping virtual tables.
#
# $Id: vtab1.test,v 1.15 2006/06/14 22:07:11 drh Exp $

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

ifcapable !vtab {
  finish_test
  return

} {1 2 3 4 5 6}
do_test vtab1-3.13 {
  set echo_module
} [list xBestIndex {SELECT rowid, * FROM 'treal' WHERE b >= ? AND b <= ?}      \
        xFilter    {SELECT rowid, * FROM 'treal' WHERE b >= ? AND b <= ?} 2 10 ]

# Add a function for the MATCH operator. Everything always matches!
#proc test_match {lhs rhs} {
#  lappend ::echo_module MATCH $lhs $rhs
#  return 1

#}
#db function match test_match

set echo_module ""
do_test vtab1-3.12 {
  set echo_module ""
  catchsql {
    SELECT * FROM t1 WHERE a MATCH 'string';
  }
} {1 {MATCH is not implemented}}
do_test vtab1-3.13 {
  set echo_module
} [list xBestIndex {SELECT rowid, * FROM 'treal'} \
        xFilter    {SELECT rowid, * FROM 'treal'}]



do_test vtab1-3.14 {
  set echo_module ""
btree_breakpoint
  execsql {
    SELECT * FROM t1 WHERE b MATCH 'string';
  }
} {}
do_test vtab1-3.15 {
  set echo_module
} [list xBestIndex \
        {SELECT rowid, * FROM 'treal' WHERE b LIKE (SELECT '%'||?||'%')}  \
        xFilter \
        {SELECT rowid, * FROM 'treal' WHERE b LIKE (SELECT '%'||?||'%')} \
        string ]

#----------------------------------------------------------------------
# Test case vtab1-3 test table scans and the echo module's 
# xBestIndex/xFilter handling of ORDER BY clauses.

# This procedure executes the SQL.  Then it checks to see if the OP_Sort
# opcode was executed.  If an OP_Sort did occur, then "sort" is appended

} {2 5 sort}
do_test vtab1-4.4 {
  set echo_module
} [list xBestIndex {SELECT rowid, * FROM 'treal'} \
        xFilter    {SELECT rowid, * FROM 'treal'} ]

finish_test