**    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 contains code used to implement the ATTACH and DETACH commands.
**
** $Id: attach.c,v 1.28 2004/09/06 17:24:12 drh Exp $
*/
#include "sqliteInt.h"

/*
** This routine is called by the parser to process an ATTACH statement:
**
**     ATTACH DATABASE filename AS dbname
................................................................................
      pItem->zDatabase = sqliteStrDup(zDb);
    }else if( sqlite3StrICmp(pItem->zDatabase,zDb)!=0 ){
      sqlite3ErrorMsg(pFix->pParse,
         "%s %T cannot reference objects in database %s",
         pFix->zType, pFix->pName, pItem->zDatabase);
      return 1;
    }

    if( sqlite3FixSelect(pFix, pItem->pSelect) ) return 1;
    if( sqlite3FixExpr(pFix, pItem->pOn) ) return 1;

  }
  return 0;
}

int sqlite3FixSelect(
  DbFixer *pFix,       /* Context of the fixation */
  Select *pSelect      /* The SELECT statement to be fixed to one database */
){
  while( pSelect ){
    if( sqlite3FixExprList(pFix, pSelect->pEList) ){
      return 1;
................................................................................
  for(i=0, pItem=pList->a; i<pList->nExpr; i++, pItem++){
    if( sqlite3FixExpr(pFix, pItem->pExpr) ){
      return 1;
    }
  }
  return 0;
}



int sqlite3FixTriggerStep(
  DbFixer *pFix,     /* Context of the fixation */
  TriggerStep *pStep /* The trigger step be fixed to one database */
){
  while( pStep ){
    if( sqlite3FixSelect(pFix, pStep->pSelect) ){
      return 1;
................................................................................
    if( sqlite3FixExprList(pFix, pStep->pExprList) ){
      return 1;
    }
    pStep = pStep->pNext;
  }
  return 0;
}

**    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 contains code used to implement the ATTACH and DETACH commands.
**
** $Id: attach.c,v 1.29 2005/01/20 11:32:23 danielk1977 Exp $
*/
#include "sqliteInt.h"

/*
** This routine is called by the parser to process an ATTACH statement:
**
**     ATTACH DATABASE filename AS dbname
................................................................................
      pItem->zDatabase = sqliteStrDup(zDb);
    }else if( sqlite3StrICmp(pItem->zDatabase,zDb)!=0 ){
      sqlite3ErrorMsg(pFix->pParse,
         "%s %T cannot reference objects in database %s",
         pFix->zType, pFix->pName, pItem->zDatabase);
      return 1;
    }
#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_TRIGGER)
    if( sqlite3FixSelect(pFix, pItem->pSelect) ) return 1;
    if( sqlite3FixExpr(pFix, pItem->pOn) ) return 1;
#endif
  }
  return 0;
}
#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_TRIGGER)
int sqlite3FixSelect(
  DbFixer *pFix,       /* Context of the fixation */
  Select *pSelect      /* The SELECT statement to be fixed to one database */
){
  while( pSelect ){
    if( sqlite3FixExprList(pFix, pSelect->pEList) ){
      return 1;
................................................................................
  for(i=0, pItem=pList->a; i<pList->nExpr; i++, pItem++){
    if( sqlite3FixExpr(pFix, pItem->pExpr) ){
      return 1;
    }
  }
  return 0;
}
#endif

#ifndef SQLITE_OMIT_TRIGGER
int sqlite3FixTriggerStep(
  DbFixer *pFix,     /* Context of the fixation */
  TriggerStep *pStep /* The trigger step be fixed to one database */
){
  while( pStep ){
    if( sqlite3FixSelect(pFix, pStep->pSelect) ){
      return 1;
................................................................................
    if( sqlite3FixExprList(pFix, pStep->pExprList) ){
      return 1;
    }
    pStep = pStep->pNext;
  }
  return 0;
}
#endif

**    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
** in order to generate code for DELETE FROM statements.
**
** $Id: delete.c,v 1.98 2005/01/19 23:24:50 drh Exp $
*/
#include "sqliteInt.h"

/*
** Look up every table that is named in pSrc.  If any table is not found,
** add an error message to pParse->zErrMsg and return NULL.  If all tables
** are found, return a pointer to the last table.
................................................................................
*/
int sqlite3IsReadOnly(Parse *pParse, Table *pTab, int viewOk){
  if( pTab->readOnly && (pParse->db->flags & SQLITE_WriteSchema)==0
        && pParse->nested==0 ){
    sqlite3ErrorMsg(pParse, "table %s may not be modified", pTab->zName);
    return 1;
  }

  if( !viewOk && pTab->pSelect ){
    sqlite3ErrorMsg(pParse,"cannot modify %s because it is a view",pTab->zName);
    return 1;
  }

  return 0;
}

/*
** Generate code that will open a table for reading.
*/
void sqlite3OpenTableForReading(

**    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
** in order to generate code for DELETE FROM statements.
**
** $Id: delete.c,v 1.99 2005/01/20 11:32:24 danielk1977 Exp $
*/
#include "sqliteInt.h"

/*
** Look up every table that is named in pSrc.  If any table is not found,
** add an error message to pParse->zErrMsg and return NULL.  If all tables
** are found, return a pointer to the last table.
................................................................................
*/
int sqlite3IsReadOnly(Parse *pParse, Table *pTab, int viewOk){
  if( pTab->readOnly && (pParse->db->flags & SQLITE_WriteSchema)==0
        && pParse->nested==0 ){
    sqlite3ErrorMsg(pParse, "table %s may not be modified", pTab->zName);
    return 1;
  }
#ifndef SQLITE_OMIT_VIEW
  if( !viewOk && pTab->pSelect ){
    sqlite3ErrorMsg(pParse,"cannot modify %s because it is a view",pTab->zName);
    return 1;
  }
#endif
  return 0;
}

/*
** Generate code that will open a table for reading.
*/
void sqlite3OpenTableForReading(

**    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 1.133 2005/01/19 23:24:50 drh Exp $
*/
#include "sqliteInt.h"

/*
** Set P3 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:
................................................................................
      onError = OE_Abort;
    }
    if( onError==OE_Replace && pTab->aCol[i].pDflt==0 ){
      onError = OE_Abort;
    }
    sqlite3VdbeAddOp(v, OP_Dup, nCol-1-i, 1);
    addr = sqlite3VdbeAddOp(v, OP_NotNull, 1, 0);


    switch( onError ){
      case OE_Rollback:
      case OE_Abort:
      case OE_Fail: {
        char *zMsg = 0;
        sqlite3VdbeAddOp(v, OP_Halt, SQLITE_CONSTRAINT, onError);
        sqlite3SetString(&zMsg, pTab->zName, ".", pTab->aCol[i].zName,
................................................................................
        break;
      }
      case OE_Replace: {
        sqlite3ExprCode(pParse, pTab->aCol[i].pDflt);
        sqlite3VdbeAddOp(v, OP_Push, nCol-i, 0);
        break;
      }
      default: assert(0);
    }
    sqlite3VdbeChangeP2(v, addr, sqlite3VdbeCurrentAddr(v));
  }

  /* Test all CHECK constraints
  */
  /**** TBD ****/
................................................................................
    

    /* Check to see if the new index entry will be unique */
    sqlite3VdbeAddOp(v, OP_Dup, extra+nCol+1+hasTwoRecnos, 1);
    jumpInst2 = sqlite3VdbeAddOp(v, OP_IsUnique, base+iCur+1, 0);

    /* Generate code that executes if the new index entry is not unique */


    switch( onError ){
      case OE_Rollback:
      case OE_Abort:
      case OE_Fail: {
        int j, n1, n2;
        char zErrMsg[200];
        strcpy(zErrMsg, pIdx->nColumn>1 ? "columns " : "column ");
................................................................................
        if( isUpdate ){
          sqlite3VdbeAddOp(v, OP_Dup, nCol+extra+1+hasTwoRecnos, 1);
          sqlite3VdbeAddOp(v, OP_MoveGe, base, 0);
        }
        seenReplace = 1;
        break;
      }
      default: assert(0);
    }
    contAddr = sqlite3VdbeCurrentAddr(v);
    assert( contAddr<(1<<24) );
#if NULL_DISTINCT_FOR_UNIQUE
    sqlite3VdbeChangeP2(v, jumpInst1, contAddr | (1<<24));
#endif
    sqlite3VdbeChangeP2(v, jumpInst2, contAddr);
................................................................................
  for(nIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdx++){}
  for(i=nIdx-1; i>=0; i--){
    if( aIdxUsed && aIdxUsed[i]==0 ) continue;
    sqlite3VdbeAddOp(v, OP_IdxPut, base+i+1, 0);
  }
  sqlite3VdbeAddOp(v, OP_MakeRecord, pTab->nCol, 0);
  sqlite3TableAffinityStr(v, pTab);

  if( newIdx>=0 ){
    sqlite3VdbeAddOp(v, OP_Dup, 1, 0);
    sqlite3VdbeAddOp(v, OP_Dup, 1, 0);
    sqlite3VdbeAddOp(v, OP_PutIntKey, newIdx, 0);
  }

  if( pParse->nested ){
    pik_flags = 0;
  }else{
    pik_flags = (OPFLAG_NCHANGE|(isUpdate?0:OPFLAG_LASTROWID));
  }
  sqlite3VdbeAddOp(v, OP_PutIntKey, base, pik_flags);
  

**    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 1.134 2005/01/20 11:32:24 danielk1977 Exp $
*/
#include "sqliteInt.h"

/*
** Set P3 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:
................................................................................
      onError = OE_Abort;
    }
    if( onError==OE_Replace && pTab->aCol[i].pDflt==0 ){
      onError = OE_Abort;
    }
    sqlite3VdbeAddOp(v, OP_Dup, nCol-1-i, 1);
    addr = sqlite3VdbeAddOp(v, OP_NotNull, 1, 0);
    assert( onError==OE_Rollback || onError==OE_Abort || onError==OE_Fail
        || onError==OE_Ignore || onError==OE_Replace );
    switch( onError ){
      case OE_Rollback:
      case OE_Abort:
      case OE_Fail: {
        char *zMsg = 0;
        sqlite3VdbeAddOp(v, OP_Halt, SQLITE_CONSTRAINT, onError);
        sqlite3SetString(&zMsg, pTab->zName, ".", pTab->aCol[i].zName,
................................................................................
        break;
      }
      case OE_Replace: {
        sqlite3ExprCode(pParse, pTab->aCol[i].pDflt);
        sqlite3VdbeAddOp(v, OP_Push, nCol-i, 0);
        break;
      }

    }
    sqlite3VdbeChangeP2(v, addr, sqlite3VdbeCurrentAddr(v));
  }

  /* Test all CHECK constraints
  */
  /**** TBD ****/
................................................................................
    

    /* Check to see if the new index entry will be unique */
    sqlite3VdbeAddOp(v, OP_Dup, extra+nCol+1+hasTwoRecnos, 1);
    jumpInst2 = sqlite3VdbeAddOp(v, OP_IsUnique, base+iCur+1, 0);

    /* Generate code that executes if the new index entry is not unique */
    assert( onError==OE_Rollback || onError==OE_Abort || onError==OE_Fail
        || onError==OE_Ignore || onError==OE_Replace );
    switch( onError ){
      case OE_Rollback:
      case OE_Abort:
      case OE_Fail: {
        int j, n1, n2;
        char zErrMsg[200];
        strcpy(zErrMsg, pIdx->nColumn>1 ? "columns " : "column ");
................................................................................
        if( isUpdate ){
          sqlite3VdbeAddOp(v, OP_Dup, nCol+extra+1+hasTwoRecnos, 1);
          sqlite3VdbeAddOp(v, OP_MoveGe, base, 0);
        }
        seenReplace = 1;
        break;
      }

    }
    contAddr = sqlite3VdbeCurrentAddr(v);
    assert( contAddr<(1<<24) );
#if NULL_DISTINCT_FOR_UNIQUE
    sqlite3VdbeChangeP2(v, jumpInst1, contAddr | (1<<24));
#endif
    sqlite3VdbeChangeP2(v, jumpInst2, contAddr);
................................................................................
  for(nIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdx++){}
  for(i=nIdx-1; i>=0; i--){
    if( aIdxUsed && aIdxUsed[i]==0 ) continue;
    sqlite3VdbeAddOp(v, OP_IdxPut, base+i+1, 0);
  }
  sqlite3VdbeAddOp(v, OP_MakeRecord, pTab->nCol, 0);
  sqlite3TableAffinityStr(v, pTab);
#ifndef SQLITE_OMIT_TRIGGER
  if( newIdx>=0 ){
    sqlite3VdbeAddOp(v, OP_Dup, 1, 0);
    sqlite3VdbeAddOp(v, OP_Dup, 1, 0);
    sqlite3VdbeAddOp(v, OP_PutIntKey, newIdx, 0);
  }
#endif
  if( pParse->nested ){
    pik_flags = 0;
  }else{
    pik_flags = (OPFLAG_NCHANGE|(isUpdate?0:OPFLAG_LASTROWID));
  }
  sqlite3VdbeAddOp(v, OP_PutIntKey, base, pik_flags);
  

** The pager is used to access a database disk file.  It implements
** atomic commit and rollback through the use of a journal file that
** is separate from the database file.  The pager also implements file
** locking to prevent two processes from writing the same database
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.183 2005/01/17 01:33:14 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include "pager.h"
#include <assert.h>
#include <string.h>

................................................................................
  }
  pPg->pNextFree = pPg->pPrevFree = 0;

  /* Unlink from the pgno hash table */
  unlinkHashChain(pPager, pPg);
}


/*
** This routine is used to truncate an in-memory database.  Delete
** all pages whose pgno is larger than pPager->dbSize and is unreferenced.
** Referenced pages larger than pPager->dbSize are zeroed.
*/
static void memoryTruncate(Pager *pPager){
  PgHdr *pPg;
................................................................................
      *ppPg = pPg->pNextAll;
      unlinkPage(pPg);
      sqliteFree(pPg);
      pPager->nPage--;
    }
  }
}




/*
** Truncate the file to the number of pages specified.
*/
int sqlite3pager_truncate(Pager *pPager, Pgno nPage){
  int rc;
  sqlite3pager_pagecount(pPager);
................................................................................
** to change the content of the page.
*/
int sqlite3pager_iswriteable(void *pData){
  PgHdr *pPg = DATA_TO_PGHDR(pData);
  return pPg->dirty;
}


/*
** Replace the content of a single page with the information in the third
** argument.
*/
int sqlite3pager_overwrite(Pager *pPager, Pgno pgno, void *pData){
  void *pPage;
  int rc;
................................................................................
    if( rc==SQLITE_OK ){
      memcpy(pPage, pData, pPager->pageSize);
    }
    sqlite3pager_unref(pPage);
  }
  return rc;
}


/*
** A call to this routine tells the pager that it is not necessary to
** write the information on page "pgno" back to the disk, even though
** that page might be marked as dirty.
**
** The overlying software layer calls this routine when all of the data

** The pager is used to access a database disk file.  It implements
** atomic commit and rollback through the use of a journal file that
** is separate from the database file.  The pager also implements file
** locking to prevent two processes from writing the same database
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.184 2005/01/20 11:32:24 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include "pager.h"
#include <assert.h>
#include <string.h>

................................................................................
  }
  pPg->pNextFree = pPg->pPrevFree = 0;

  /* Unlink from the pgno hash table */
  unlinkHashChain(pPager, pPg);
}

#ifndef SQLITE_OMIT_MEMORYDB
/*
** This routine is used to truncate an in-memory database.  Delete
** all pages whose pgno is larger than pPager->dbSize and is unreferenced.
** Referenced pages larger than pPager->dbSize are zeroed.
*/
static void memoryTruncate(Pager *pPager){
  PgHdr *pPg;
................................................................................
      *ppPg = pPg->pNextAll;
      unlinkPage(pPg);
      sqliteFree(pPg);
      pPager->nPage--;
    }
  }
}
#else
#define memoryTruncate(p)
#endif

/*
** Truncate the file to the number of pages specified.
*/
int sqlite3pager_truncate(Pager *pPager, Pgno nPage){
  int rc;
  sqlite3pager_pagecount(pPager);
................................................................................
** to change the content of the page.
*/
int sqlite3pager_iswriteable(void *pData){
  PgHdr *pPg = DATA_TO_PGHDR(pData);
  return pPg->dirty;
}

#ifndef SQLITE_OMIT_VACUUM
/*
** Replace the content of a single page with the information in the third
** argument.
*/
int sqlite3pager_overwrite(Pager *pPager, Pgno pgno, void *pData){
  void *pPage;
  int rc;
................................................................................
    if( rc==SQLITE_OK ){
      memcpy(pPage, pData, pPager->pageSize);
    }
    sqlite3pager_unref(pPage);
  }
  return rc;
}
#endif

/*
** A call to this routine tells the pager that it is not necessary to
** write the information on page "pgno" back to the disk, even though
** that page might be marked as dirty.
**
** The overlying software layer calls this routine when all of the data

**    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 contains code used to implement the PRAGMA command.
**
** $Id: pragma.c,v 1.83 2005/01/11 10:25:08 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/* Ignore this whole file if pragmas are disabled
*/
................................................................................
/*
** Interpret the given string as a boolean value.
*/
static int getBoolean(const u8 *z){
  return getSafetyLevel(z)&1;
}


/*
** Interpret the given string as a temp db location. Return 1 for file
** backed temporary databases, 2 for the Red-Black tree in memory database
** and 0 to use the compile-time default.
*/
static int getTempStore(const char *z){
  if( z[0]>='0' && z[0]<='2' ){
................................................................................
  if( db->temp_store==ts ) return SQLITE_OK;
  if( invalidateTempStorage( pParse ) != SQLITE_OK ){
    return SQLITE_ERROR;
  }
  db->temp_store = ts;
  return SQLITE_OK;
}


/*
** Generate code to return a single integer value.
*/
static void returnSingleInt(Parse *pParse, const char *zLabel, int value){
  Vdbe *v = sqlite3GetVdbe(pParse);
  sqlite3VdbeAddOp(v, OP_Integer, value, 0);

**    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 contains code used to implement the PRAGMA command.
**
** $Id: pragma.c,v 1.84 2005/01/20 11:32:24 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/* Ignore this whole file if pragmas are disabled
*/
................................................................................
/*
** Interpret the given string as a boolean value.
*/
static int getBoolean(const u8 *z){
  return getSafetyLevel(z)&1;
}

#ifndef SQLITE_OMIT_PAGER_PRAGMAS
/*
** Interpret the given string as a temp db location. Return 1 for file
** backed temporary databases, 2 for the Red-Black tree in memory database
** and 0 to use the compile-time default.
*/
static int getTempStore(const char *z){
  if( z[0]>='0' && z[0]<='2' ){
................................................................................
  if( db->temp_store==ts ) return SQLITE_OK;
  if( invalidateTempStorage( pParse ) != SQLITE_OK ){
    return SQLITE_ERROR;
  }
  db->temp_store = ts;
  return SQLITE_OK;
}
#endif

/*
** Generate code to return a single integer value.
*/
static void returnSingleInt(Parse *pParse, const char *zLabel, int value){
  Vdbe *v = sqlite3GetVdbe(pParse);
  sqlite3VdbeAddOp(v, OP_Integer, value, 0);