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 1.260 2006/06/13 01:04:52 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

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

      if( pExpr->iTable<0 ){
        /* This only happens when coding check constraints */
        assert( pParse->ckOffset>0 );
        sqlite3VdbeAddOp(v, OP_Dup, pParse->ckOffset-pExpr->iColumn-1, 1);
      }else if( pExpr->iColumn>=0 ){
        Table *pTab = pExpr->pTab;
        int iCol = pExpr->iColumn;
        sqlite3VdbeAddOp(v, pTab->isVirtual ? OP_VColumn : OP_Column,
                            pExpr->iTable, iCol);
        sqlite3ColumnDefault(v, pTab, iCol);
#ifndef SQLITE_OMIT_FLOATING_POINT
        if( pTab && pTab->aCol[iCol].affinity==SQLITE_AFF_REAL ){
          sqlite3VdbeAddOp(v, OP_RealAffinity, 0, 0);
        }
#endif
      }else{

        sqlite3VdbeAddOp(v, pExpr->pTab->isVirtual ? OP_VRowid : OP_Rowid,
                         pExpr->iTable, 0);
      }
      break;
    }
    case TK_INTEGER: {
      codeInteger(v, (char*)pExpr->token.z, pExpr->token.n);
      break;
    }

**    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 1.6 2006/06/13 01:04:53 drh Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
#include "os.h"
#include <stdlib.h>
#include <string.h>

/*
** Global Tcl variable $echo_module is a list. This routine appends
** the string element zArg to that list in interpreter interp.
*/
static void appendToEchoModule(Tcl_Interp *interp, const char *zArg){
  int flags = (TCL_APPEND_VALUE | TCL_LIST_ELEMENT | TCL_GLOBAL_ONLY);
  Tcl_SetVar(interp, "echo_module", zArg, flags);
}

static void appendToEchoTable(Tcl_Interp *interp, const char *zArg){
  int flags = (TCL_APPEND_VALUE | TCL_LIST_ELEMENT | TCL_GLOBAL_ONLY);
  Tcl_SetVar(interp, "echo_module", zArg, flags);
}

/*
** This function is called from within the echo-modules xCreate and
** xConnect methods. The argc and argv arguments are copies of those 

  Tcl_Interp *interp = pModule->pAux;
  echo_vtab *pVtab;

  pVtab = sqliteMalloc( sizeof(*pVtab) );
  *ppVtab = &pVtab->base;
  pVtab->base.pModule = pModule;
  pVtab->interp = pModule->pAux;
  Tcl_SetVar(interp, "echo_module", "xConnect", TCL_GLOBAL_ONLY);
  for(i=0; i<argc; i++){
    Tcl_SetVar(interp, "echo_module", argv[i],
                TCL_APPEND_VALUE | TCL_LIST_ELEMENT | TCL_GLOBAL_ONLY);
  }

  echoDeclareVtab(db, argc, argv);
  return 0;
}
static int echoDisconnect(sqlite3_vtab *pVtab){
  echo_vtab *p = (echo_vtab*)pVtab;
  appendToEchoTable(p->interp, "xDisconnect");
  sqliteFree(pVtab);
  return 0;
}
static int echoDestroy(sqlite3_vtab *pVtab){
  echo_vtab *p = (echo_vtab*)pVtab;
  Tcl_SetVar(p->interp, "echo_module", "xDestroy",
                TCL_APPEND_VALUE | TCL_LIST_ELEMENT | TCL_GLOBAL_ONLY);
  return 0;
}

/*
** The xBestIndex method for the echo module always returns
** an index of 123.
*/

# 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 1.6 2006/06/12 16:01:23 danielk1977 Exp $

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

ifcapable !vtab {
  finish_test
  return

# the xDisconnect() callback each of the two virtual tables - t1 and t2.
do_test vtab1-2.3 {
  set echo_module [list]
  db close
  set echo_module
} [list xDisconnect xDisconnect]


# Re-open the database. Check that the schema of the virtual
# table is still correct.
do_test vtab1-2.4 {
  sqlite3 db test.db
  register_echo_module [sqlite3_connection_pointer db]
  execsql { PRAGMA table_info(t2); }
} [list         \

do_test vtab1-2.5 {
  set echo_module [list]
  execsql { 
    DROP TABLE t2;
  }
  set echo_module
} [list xDestroy]



do_test vtab1-2.6 {
  execsql { 
    PRAGMA table_info(t2); 
  }
} {}
do_test vtab1-2.7 {
  execsql {
    SELECT sql FROM sqlite_master;
  }
} [list {CREATE VIRTUAL TABLE t1 USING echo} \
        {CREATE TABLE template(a, b, c)}     \
]














finish_test