SQLite

**     DROP INDEX
**     creating ID lists
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**     PRAGMA
**
** $Id: build.c,v 1.231 2004/06/22 12:18:32 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** This routine is called when a new SQL statement is beginning to
** be parsed.  Check to see if the schema for the database needs

**
** See also sqlite3LocateTable().
*/
Table *sqlite3FindTable(sqlite *db, const char *zName, const char *zDatabase){
  Table *p = 0;
  int i;
  int rc = sqlite3ReadSchema(db, 0);

  for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
    int j = (i<2) ? i^1 : i;   /* Search TEMP before MAIN */
    if( zDatabase!=0 && sqlite3StrICmp(zDatabase, db->aDb[j].zName) ) continue;
    p = sqlite3HashFind(&db->aDb[j].tblHash, zName, strlen(zName)+1);
    if( p ) break;
  }
  return p;

  }

  /* If the trigger name was unqualified, and the table is a temp table,
  ** then set iDb to 1 to create the trigger in the temporary database.
  ** If sqlite3SrcListLookup() returns 0, indicating the table does not
  ** exist, the error is caught by the block below.
  */
  if( !pTableName ) goto trigger_cleanup;
  pTab = sqlite3SrcListLookup(pParse, pTableName);
  if( pName2->n==0 && pTab && pTab->iDb==1 ){
    iDb = 1;
  }

  /* Ensure the table name matches database name and that the table exists */
  if( sqlite3_malloc_failed ) goto trigger_cleanup;

**
** Various scripts scan this source file in order to generate HTML
** documentation, headers files, or other derived files.  The formatting
** of the code in this file is, therefore, important.  See other comments
** in this file for details.  If in doubt, do not deviate from existing
** commenting and indentation practices when changing or adding code.
**
** $Id: vdbe.c,v 1.385 2004/06/21 11:30:56 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include "vdbeInt.h"

/*

    pElem->aMem[i].flags = MEM_Null;
  }
  p->pCurrent = pElem;
  return 0;
}

/*
** Get the AggElem currently in focus
*/
#if 0
#define AggInFocus(P)   ((P).pCurrent ? (P).pCurrent : _AggInFocus(&(P)))
static AggElem *_AggInFocus(Agg *p){
  HashElem *pElem = sqliteHashFirst(&p->hash);
  if( pElem==0 ){
    AggInsert(p,"",1);
    pElem = sqliteHashFirst(&p->hash);
  }
  return pElem ? sqliteHashData(pElem) : 0;
}
#endif
/*
** Store a pointer to the AggElem currently in focus in *ppElem. Return
** SQLITE_OK if successful, otherwise an error-code.
*/
static int AggInFocus(Agg *p, AggElem **ppElem){
  int rc;
  int res;

** OP_AggFocus.
*/
case OP_AggReset: {
  assert( !pOp->p3 || pOp->p3type==P3_KEYINFO );
  if( pOp->p1 ){
    rc = sqlite3VdbeAggReset(0, &p->agg, (KeyInfo *)pOp->p3);
    p->agg.nMem = pOp->p2;    /* Agg.nMem is used by AggInsert() */
    AggInsert(&p->agg, 0, 0);
  }else{
    rc = sqlite3VdbeAggReset(db, &p->agg, (KeyInfo *)pOp->p3);
    p->agg.nMem = pOp->p2;
  }
  if( rc!=SQLITE_OK ){
    goto abort_due_to_error;
  }

** Free all resources allociated with AggElem pElem, an element of
** aggregate pAgg.
*/
void freeAggElem(AggElem *pElem, Agg *pAgg){
  int i;
  for(i=0; i<pAgg->nMem; i++){
    Mem *pMem = &pElem->aMem[i];
    if( pAgg->apFunc[i] && (pMem->flags & MEM_AggCtx)!=0 ){
      sqlite3_context ctx;
      ctx.pFunc = pAgg->apFunc[i];
      ctx.s.flags = MEM_Null;
      ctx.pAgg = pMem->z;
      ctx.cnt = pMem->i;
      ctx.isStep = 0;
      ctx.isError = 0;