**     COPY
**     VACUUM
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**     PRAGMA
**
** $Id: build.c,v 1.136 2003/03/30 00:19:50 drh 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
................................................................................
}

/*
** Erase all schema information from the in-memory hash tables of
** database connection.  This routine is called to reclaim memory
** before the connection closes.  It is also called during a rollback
** if there were schema changes during the transaction.




*/
void sqliteResetInternalSchema(sqlite *db){
  HashElem *pElem;
  Hash temp1;
  Hash temp2;
  int i;



  for(i=0; i<db->nDb; i++){
    Db *pDb = &db->aDb[i];
    temp1 = pDb->tblHash;
    temp2 = pDb->trigHash;
    sqliteHashInit(&pDb->trigHash, SQLITE_HASH_STRING, 0);
    sqliteHashClear(&pDb->aFKey);
    sqliteHashClear(&pDb->idxHash);
    for(pElem=sqliteHashFirst(&temp2); pElem; pElem=sqliteHashNext(pElem)){
................................................................................
    sqliteHashClear(&temp2);
    sqliteHashInit(&pDb->tblHash, SQLITE_HASH_STRING, 0);
    for(pElem=sqliteHashFirst(&temp1); pElem; pElem=sqliteHashNext(pElem)){
      Table *pTab = sqliteHashData(pElem);
      sqliteDeleteTable(db, pTab);
    }
    sqliteHashClear(&temp1);


  }

  db->flags &= ~(SQLITE_Initialized|SQLITE_InternChanges);
























}

/*
** This routine is called whenever a rollback occurs.  If there were
** schema changes during the transaction, then we have to reset the
** internal hash tables and reload them from disk.
*/
void sqliteRollbackInternalChanges(sqlite *db){
  if( db->flags & SQLITE_InternChanges ){
    sqliteResetInternalSchema(db);
  }
}

/*
** This routine is called when a commit occurs.
*/
void sqliteCommitInternalChanges(sqlite *db){
................................................................................
  int isView       /* True if this is a VIEW */
){
  Table *pTable;
  Index *pIdx;
  char *zName;
  sqlite *db = pParse->db;
  Vdbe *v;


  pParse->sFirstToken = *pStart;
  zName = sqliteTableNameFromToken(pName);
  if( zName==0 ) return;
  if( pParse->iDb==1 ) isTemp = 1;
#ifndef SQLITE_OMIT_AUTHORIZATION
  assert( (isTemp & 1)==isTemp );
................................................................................
  ** index or table name.  Issue an error message if it does.
  **
  ** If we are re-reading the sqlite_master table because of a schema
  ** change and a new permanent table is found whose name collides with
  ** an existing temporary table, that is not an error.
  */
  pTable = sqliteFindTable(db, zName, 0);

  if( pTable!=0 && (pTable->iDb==isTemp || !pParse->initFlag) ){
    sqliteSetNString(&pParse->zErrMsg, "table ", 0, pName->z, pName->n,
        " already exists", 0, 0);
    sqliteFree(zName);
    pParse->nErr++;
    return;
  }
  if( (pIdx = sqliteFindIndex(db, zName, 0))!=0 &&
................................................................................
    return;
  }
  pTable->zName = zName;
  pTable->nCol = 0;
  pTable->aCol = 0;
  pTable->iPKey = -1;
  pTable->pIndex = 0;
  pTable->iDb = isTemp ? 1 : pParse->iDb;
  if( pParse->pNewTable ) sqliteDeleteTable(db, pParse->pNewTable);
  pParse->pNewTable = pTable;

  /* Begin generating the code that will insert the table record into
  ** the SQLITE_MASTER table.  Note in particular that we must go ahead
  ** and allocate the record number for the table entry now.  Before any
  ** PRIMARY KEY or UNIQUE keywords are parsed.  Those keywords will cause
................................................................................
  if( pTab==0 || pParse->nErr ) goto exit_create_index;
  if( pTab->readOnly ){
    sqliteSetString(&pParse->zErrMsg, "table ", pTab->zName,
      " may not be indexed", 0);
    pParse->nErr++;
    goto exit_create_index;
  }
  if( !isTemp && pTab->iDb>=2 ){
    sqliteSetString(&pParse->zErrMsg, "table ", pTab->zName, 
      " may not have non-temporary indices added", 0);
    pParse->nErr++;
    goto exit_create_index;
  }
  if( pTab->pSelect ){
    sqliteSetString(&pParse->zErrMsg, "views may not be indexed", 0);
................................................................................
    pParse->nErr++;
    goto exit_create_index;
  }
  if( pTab->iDb==1 ){
    isTemp = 1;
  }


#if 0
  /* If this index is created while re-reading the schema from sqlite_master
  ** but the table associated with this index is a temporary table, it can
  ** only mean that the table that this index is really associated with is
  ** one whose name is hidden behind a temporary table with the same name.
  ** Since its table has been suppressed, we need to also suppress the
  ** index.
  */
  if( pParse->initFlag && !pParse->isTemp && pTab->iDb ){
    goto exit_create_index;
  }
#endif

  /*
  ** Find the name of the index.  Make sure there is not already another
  ** index or table with the same name.  
  **
  ** Exception:  If we are reading the names of permanent indices from the
  ** sqlite_master table (because some other process changed the schema) and
  ** one of the index names collides with the name of a temporary table or
................................................................................
*/
void sqliteCodeVerifySchema(Parse *pParse){
  int i;
  sqlite *db = pParse->db;
  Vdbe *v = sqliteGetVdbe(pParse);
  for(i=0; i<db->nDb; i++){
    if( i==1 || db->aDb[i].pBt==0 ) continue;
    sqliteVdbeAddOp(v, OP_VerifyCookie, 0, db->aDb[i].schema_cookie);
  }
  pParse->schemaVerified = 1;
}

/*
** Generate VDBE code that prepares for doing an operation that
** might change the database.
................................................................................
    sqliteVdbeAddOpList(v, ArraySize(checkDb), checkDb);
  }else

  {}
  sqliteFree(zLeft);
  sqliteFree(zRight);
}

**     COPY
**     VACUUM
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**     PRAGMA
**
** $Id: build.c,v 1.137 2003/03/31 00:30:48 drh 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
................................................................................
}

/*
** Erase all schema information from the in-memory hash tables of
** database connection.  This routine is called to reclaim memory
** before the connection closes.  It is also called during a rollback
** if there were schema changes during the transaction.
**
** If iDb<=0 then reset the internal schema tables for all database
** files.  If iDb>=2 then reset the internal schema for only the
** single file indicates.
*/
void sqliteResetInternalSchema(sqlite *db, int iDb){
  HashElem *pElem;
  Hash temp1;
  Hash temp2;
  int i, j;

  assert( iDb>=0 && iDb<db->nDb );
  db->flags &= ~SQLITE_Initialized;
  for(i=iDb; i<db->nDb; i++){
    Db *pDb = &db->aDb[i];
    temp1 = pDb->tblHash;
    temp2 = pDb->trigHash;
    sqliteHashInit(&pDb->trigHash, SQLITE_HASH_STRING, 0);
    sqliteHashClear(&pDb->aFKey);
    sqliteHashClear(&pDb->idxHash);
    for(pElem=sqliteHashFirst(&temp2); pElem; pElem=sqliteHashNext(pElem)){
................................................................................
    sqliteHashClear(&temp2);
    sqliteHashInit(&pDb->tblHash, SQLITE_HASH_STRING, 0);
    for(pElem=sqliteHashFirst(&temp1); pElem; pElem=sqliteHashNext(pElem)){
      Table *pTab = sqliteHashData(pElem);
      sqliteDeleteTable(db, pTab);
    }
    sqliteHashClear(&temp1);
    db->aDb[i].flags &= ~SQLITE_Initialized;
    if( iDb>0 ) return;
  }
  assert( iDb==0 );
  db->flags &= ~SQLITE_InternChanges;

  /* If one or more of the auxiliary database files has been closed,
  ** then remove then from the auxiliary database list.  We take the
  ** opportunity to do this here since we have just deleted all of the
  ** schema hash tables and therefore do not have to make any changes
  ** to any of those tables.
  */
  for(i=j=2; i<db->nDb; i++){
    if( db->aDb[i].pBt==0 ){
      sqliteFree(db->aDb[i].zName);
      db->aDb[i].zName = 0;
      continue;
    }
    if( j<i ){
      db->aDb[j++] = db->aDb[i];
    }
  }
  memset(&db->aDb[j], 0, (db->nDb-j)*sizeof(db->aDb[j]));
  db->nDb = j;
  if( db->nDb<=2 && db->aDb!=db->aDbStatic ){
    memcpy(db->aDbStatic, db->aDb, 2*sizeof(db->aDb[0]));
    sqliteFree(db->aDb);
    db->aDb = db->aDbStatic;
  }
}

/*
** This routine is called whenever a rollback occurs.  If there were
** schema changes during the transaction, then we have to reset the
** internal hash tables and reload them from disk.
*/
void sqliteRollbackInternalChanges(sqlite *db){
  if( db->flags & SQLITE_InternChanges ){
    sqliteResetInternalSchema(db, 0);
  }
}

/*
** This routine is called when a commit occurs.
*/
void sqliteCommitInternalChanges(sqlite *db){
................................................................................
  int isView       /* True if this is a VIEW */
){
  Table *pTable;
  Index *pIdx;
  char *zName;
  sqlite *db = pParse->db;
  Vdbe *v;
  int iDb;

  pParse->sFirstToken = *pStart;
  zName = sqliteTableNameFromToken(pName);
  if( zName==0 ) return;
  if( pParse->iDb==1 ) isTemp = 1;
#ifndef SQLITE_OMIT_AUTHORIZATION
  assert( (isTemp & 1)==isTemp );
................................................................................
  ** index or table name.  Issue an error message if it does.
  **
  ** If we are re-reading the sqlite_master table because of a schema
  ** change and a new permanent table is found whose name collides with
  ** an existing temporary table, that is not an error.
  */
  pTable = sqliteFindTable(db, zName, 0);
  iDb = isTemp ? 1 : pParse->iDb;
  if( pTable!=0 && (pTable->iDb==iDb || !pParse->initFlag) ){
    sqliteSetNString(&pParse->zErrMsg, "table ", 0, pName->z, pName->n,
        " already exists", 0, 0);
    sqliteFree(zName);
    pParse->nErr++;
    return;
  }
  if( (pIdx = sqliteFindIndex(db, zName, 0))!=0 &&
................................................................................
    return;
  }
  pTable->zName = zName;
  pTable->nCol = 0;
  pTable->aCol = 0;
  pTable->iPKey = -1;
  pTable->pIndex = 0;
  pTable->iDb = iDb;
  if( pParse->pNewTable ) sqliteDeleteTable(db, pParse->pNewTable);
  pParse->pNewTable = pTable;

  /* Begin generating the code that will insert the table record into
  ** the SQLITE_MASTER table.  Note in particular that we must go ahead
  ** and allocate the record number for the table entry now.  Before any
  ** PRIMARY KEY or UNIQUE keywords are parsed.  Those keywords will cause
................................................................................
  if( pTab==0 || pParse->nErr ) goto exit_create_index;
  if( pTab->readOnly ){
    sqliteSetString(&pParse->zErrMsg, "table ", pTab->zName,
      " may not be indexed", 0);
    pParse->nErr++;
    goto exit_create_index;
  }
  if( !isTemp && pTab->iDb>=2 && pParse->initFlag==0 ){
    sqliteSetString(&pParse->zErrMsg, "table ", pTab->zName, 
      " may not have non-temporary indices added", 0);
    pParse->nErr++;
    goto exit_create_index;
  }
  if( pTab->pSelect ){
    sqliteSetString(&pParse->zErrMsg, "views may not be indexed", 0);
................................................................................
    pParse->nErr++;
    goto exit_create_index;
  }
  if( pTab->iDb==1 ){
    isTemp = 1;
  }















  /*
  ** Find the name of the index.  Make sure there is not already another
  ** index or table with the same name.  
  **
  ** Exception:  If we are reading the names of permanent indices from the
  ** sqlite_master table (because some other process changed the schema) and
  ** one of the index names collides with the name of a temporary table or
................................................................................
*/
void sqliteCodeVerifySchema(Parse *pParse){
  int i;
  sqlite *db = pParse->db;
  Vdbe *v = sqliteGetVdbe(pParse);
  for(i=0; i<db->nDb; i++){
    if( i==1 || db->aDb[i].pBt==0 ) continue;
    sqliteVdbeAddOp(v, OP_VerifyCookie, i, db->aDb[i].schema_cookie);
  }
  pParse->schemaVerified = 1;
}

/*
** Generate VDBE code that prepares for doing an operation that
** might change the database.
................................................................................
    sqliteVdbeAddOpList(v, ArraySize(checkDb), checkDb);
  }else

  {}
  sqliteFree(zLeft);
  sqliteFree(zRight);
}

/*
** This routine is called by the parser to process an ATTACH statement:
**
**     ATTACH DATABASE filename AS dbname
**
** The pFilename and pDbname arguments are the tokens that define the
** filename and dbname in the ATTACH statement.
*/
void sqliteAttach(Parse *pParse, Token *pFilename, Token *pDbname){
  Db *aNew;
  int rc, i;
  char *zFile, *zName;
  sqlite *db;

  if( pParse->explain ) return;
  db = pParse->db;
  if( db->aDb==db->aDbStatic ){
    aNew = sqliteMalloc( sizeof(db->aDb[0])*3 );
    if( aNew==0 ) return;
    memcpy(aNew, db->aDb, sizeof(db->aDb[0])*2);
  }else{
    aNew = sqliteRealloc(db->aDb, sizeof(db->aDb[0])*(db->nDb+1) );
    if( aNew==0 ) return;
  }
  db->aDb = aNew;
  aNew = &db->aDb[db->nDb++];
  memset(aNew, 0, sizeof(*aNew));
  sqliteHashInit(&aNew->tblHash, SQLITE_HASH_STRING, 0);
  sqliteHashInit(&aNew->idxHash, SQLITE_HASH_STRING, 0);
  sqliteHashInit(&aNew->trigHash, SQLITE_HASH_STRING, 0);
  sqliteHashInit(&aNew->aFKey, SQLITE_HASH_STRING, 1);
  
  zName = 0;
  sqliteSetNString(&zName, pDbname->z, pDbname->n, 0);
  if( zName==0 ) return;
  sqliteDequote(zName);
  for(i=0; i<db->nDb; i++){
    if( db->aDb[i].zName && sqliteStrICmp(db->aDb[i].zName, zName)==0 ){
      sqliteSetString(&pParse->zErrMsg, "database \"", zName, 
         "\" already in use", 0);
      sqliteFree(zName);
      pParse->nErr++;
      return;
    }
  }
  aNew->zName = zName;
  zFile = 0;
  sqliteSetNString(&zFile, pFilename->z, pFilename->n, 0);
  if( zFile==0 ) return;
  sqliteDequote(zFile);
  rc = sqliteBtreeOpen(zFile, 0, MAX_PAGES, &aNew->pBt);
  if( rc ){
    sqliteSetString(&pParse->zErrMsg, "unable to open database: ", zFile, 0);
    pParse->nErr++;
  }
  sqliteFree(zFile);
  db->flags &= ~SQLITE_Initialized;
  if( pParse->nErr ) return;
  rc = sqliteInit(pParse->db, &pParse->zErrMsg);
  if( rc ){
    pParse->nErr++;
  }
}

/*
** This routine is called by the parser to process a DETACH statement:
**
**    DETACH DATABASE dbname
**
** The pDbname argument is the name of the database in the DETACH statement.
*/
void sqliteDetach(Parse *pParse, Token *pDbname){
  int i;
  sqlite *db;

  if( pParse->explain ) return;
  db = pParse->db;
  for(i=0; i<db->nDb; i++){
    if( db->aDb[i].pBt==0 || db->aDb[i].zName==0 ) continue;
    if( strlen(db->aDb[i].zName)!=pDbname->n ) continue;
    if( sqliteStrNICmp(db->aDb[i].zName, pDbname->z, pDbname->n)==0 ) break;
  }
  if( i>=db->nDb ){
    sqliteSetNString(&pParse->zErrMsg, "no such database: ", -1,
        pDbname->z, pDbname->n, 0);
    pParse->nErr++;
    return;
  }
  if( i<2 ){
    sqliteSetString(&pParse->zErrMsg, "cannot detached \"main\" or \"temp\"",0);
    pParse->nErr++;
    return;
  }
  sqliteBtreeClose(db->aDb[i].pBt);
  db->aDb[i].pBt = 0;
  sqliteResetInternalSchema(db, 0);
}

**
*************************************************************************
** Main file for the SQLite library.  The routines in this file
** implement the programmer interface to the library.  Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.118 2003/03/30 19:17:02 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
** A pointer to this structure is used to communicate information
................................................................................
**
** Each callback contains the following information:
**
**     argv[0] = "file-format" or "schema-cookie" or "table" or "index"
**     argv[1] = table or index name or meta statement type.
**     argv[2] = root page number for table or index.  NULL for meta.
**     argv[3] = SQL text for a CREATE TABLE or CREATE INDEX statement.
**     argv[4] = "1" for temporary files, "0" for main database

**
*/
static
int sqliteInitCallback(void *pInit, int argc, char **argv, char **azColName){
  InitData *pData = (InitData*)pInit;
  Parse sParse;
  int nErr = 0;
................................................................................
  return rc!=SQLITE_OK;
}



/*
** Attempt to read the database schema and initialize internal



** data structures.  Return one of the SQLITE_ error codes to
** indicate success or failure.
**
** After the database is initialized, the SQLITE_Initialized
** bit is set in the flags field of the sqlite structure.  An
** attempt is made to initialize the database as soon as it
** is opened.  If that fails (perhaps because another process
** has the sqlite_master table locked) than another attempt
** is made the first time the database is accessed.
*/
int sqliteInit(sqlite *db, char **pzErrMsg){

  int rc;
  BtCursor *curMain;
  int size;
  Table *pTab;
  char *azArg[6];

  int meta[SQLITE_N_BTREE_META];
  Parse sParse;
  InitData initData;

  /*
  ** The master database table has a structure like this
  */
................................................................................
     "UNION ALL "
     "SELECT type, name, rootpage, sql, 0 FROM sqlite_master "
     "WHERE type='table' "
     "UNION ALL "
     "SELECT type, name, rootpage, sql, 0 FROM sqlite_master "
     "WHERE type='index'";




  /* Construct the schema tables: sqlite_master and sqlite_temp_master
  */
  azArg[0] = "table";
  azArg[1] = MASTER_NAME;
  azArg[2] = "2";
  azArg[3] = master_schema;

  azArg[4] = "0";
  azArg[5] = 0;
  initData.db = db;
  initData.pzErrMsg = pzErrMsg;
  sqliteInitCallback(&initData, 5, azArg, 0);
  pTab = sqliteFindTable(db, MASTER_NAME, "main");
  if( pTab ){
    pTab->readOnly = 1;
  }

  azArg[1] = TEMP_MASTER_NAME;
  azArg[3] = temp_master_schema;
  azArg[4] = "1";
  sqliteInitCallback(&initData, 5, azArg, 0);
  pTab = sqliteFindTable(db, TEMP_MASTER_NAME, "temp");
  if( pTab ){
    pTab->readOnly = 1;

  }

  /* Create a cursor to hold the database open
  */
  if( db->aDb[0].pBt==0 ) return SQLITE_OK;
  rc = sqliteBtreeCursor(db->aDb[0].pBt, 2, 0, &curMain);
  if( rc ){
    sqliteSetString(pzErrMsg, sqlite_error_string(rc), 0);
    sqliteResetInternalSchema(db);
    return rc;
  }

  /* Get the database meta information
  */
  rc = sqliteBtreeGetMeta(db->aDb[0].pBt, meta);
  if( rc ){
    sqliteSetString(pzErrMsg, sqlite_error_string(rc), 0);
    sqliteResetInternalSchema(db);
    sqliteBtreeCloseCursor(curMain);
    return rc;
  }
  db->next_cookie = db->aDb[0].schema_cookie = meta[1];


  db->file_format = meta[2];
  size = meta[3];
  if( size==0 ){ size = MAX_PAGES; }
  db->cache_size = size;
  sqliteBtreeSetCacheSize(db->aDb[0].pBt, size);
  db->safety_level = meta[4];
  if( db->safety_level==0 ) db->safety_level = 2;
  sqliteBtreeSetSafetyLevel(db->aDb[0].pBt, db->safety_level);

  /*
  **     file_format==1    Version 2.1.0.
  **     file_format==2    Version 2.2.0. Add support for INTEGER PRIMARY KEY.
  **     file_format==3    Version 2.6.0. Fix empty-string index bug.
  **     file_format==4    Version 2.7.0. Add support for separate numeric and
  **                       text datatypes.
  */
  if( db->file_format==0 ){
    /* This happens if the database was initially empty */
    db->file_format = 4;
  }else if( db->file_format>4 ){
    sqliteBtreeCloseCursor(curMain);
    sqliteSetString(pzErrMsg, "unsupported file format", 0);
    return SQLITE_ERROR;
  }










  /* Read the schema information out of the schema tables
  */
  memset(&sParse, 0, sizeof(sParse));
  sParse.db = db;
  sParse.xCallback = sqliteInitCallback;
  sParse.pArg = (void*)&initData;
  sParse.initFlag = 1;
  sParse.useCallback = 1;

  sqliteRunParser(&sParse,
      db->file_format>=2 ? init_script : older_init_script,
      pzErrMsg);









  if( sqlite_malloc_failed ){
    sqliteSetString(pzErrMsg, "out of memory", 0);
    sParse.rc = SQLITE_NOMEM;
    sqliteBtreeRollback(db->aDb[0].pBt);
    sqliteResetInternalSchema(db);
  }
  if( sParse.rc==SQLITE_OK ){































    db->flags |= SQLITE_Initialized;
    sqliteCommitInternalChanges(db);
  }else{
    db->flags &= ~SQLITE_Initialized;
    sqliteResetInternalSchema(db);
  }
  sqliteBtreeCloseCursor(curMain);
  return sParse.rc;
}

/*
** The version of the library
*/
const char rcsid[] = "@(#) \044Id: SQLite version " SQLITE_VERSION " $";
const char sqlite_version[] = SQLITE_VERSION;
................................................................................
    /* printf("DID NOT CLOSE\n"); fflush(stdout); */
    return;
  }
  db->magic = SQLITE_MAGIC_CLOSED;
  for(j=0; j<db->nDb; j++){
    if( db->aDb[j].pBt ){
      sqliteBtreeClose(db->aDb[j].pBt);

    }
    if( j>=2 ){
      sqliteFree(db->aDb[j].zName);

    }
  }
  if( db->aDb!=db->aDbStatic ){
    sqliteFree(db->aDb);
  }
  sqliteResetInternalSchema(db);


  for(i=sqliteHashFirst(&db->aFunc); i; i=sqliteHashNext(i)){
    FuncDef *pFunc, *pNext;
    for(pFunc = (FuncDef*)sqliteHashData(i); pFunc; pFunc=pNext){
      pNext = pFunc->pNext;
      sqliteFree(pFunc);
    }
  }
................................................................................
  if( db->xTrace ) db->xTrace(db->pTraceArg, zSql);
#endif
  sqliteRunParser(&sParse, zSql, pzErrMsg);
  if( sqlite_malloc_failed ){
    sqliteSetString(pzErrMsg, "out of memory", 0);
    sParse.rc = SQLITE_NOMEM;
    sqliteRollbackAll(db);
    sqliteResetInternalSchema(db);
    db->flags &= ~SQLITE_InTrans;
  }
  if( sParse.rc==SQLITE_DONE ) sParse.rc = SQLITE_OK;
  if( sParse.rc!=SQLITE_OK && pzErrMsg && *pzErrMsg==0 ){
    sqliteSetString(pzErrMsg, sqlite_error_string(sParse.rc), 0);
  }
  sqliteStrRealloc(pzErrMsg);
  if( sParse.rc==SQLITE_SCHEMA ){
    sqliteResetInternalSchema(db);
  }
  if( sParse.useCallback==0 ){
    assert( ppVm );
    *ppVm = (sqlite_vm*)sParse.pVdbe;
    *pzTail = sParse.zTail;
  }
  if( sqliteSafetyOff(db) ) goto exec_misuse;

**
*************************************************************************
** Main file for the SQLite library.  The routines in this file
** implement the programmer interface to the library.  Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.119 2003/03/31 00:30:48 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
** A pointer to this structure is used to communicate information
................................................................................
**
** Each callback contains the following information:
**
**     argv[0] = "file-format" or "schema-cookie" or "table" or "index"
**     argv[1] = table or index name or meta statement type.
**     argv[2] = root page number for table or index.  NULL for meta.
**     argv[3] = SQL text for a CREATE TABLE or CREATE INDEX statement.
**     argv[4] = "1" for temporary files, "0" for main database, "2" or more
**               for auxiliary database files.
**
*/
static
int sqliteInitCallback(void *pInit, int argc, char **argv, char **azColName){
  InitData *pData = (InitData*)pInit;
  Parse sParse;
  int nErr = 0;
................................................................................
  return rc!=SQLITE_OK;
}



/*
** Attempt to read the database schema and initialize internal
** data structures for a single database file.  The index of the
** database file is given by iDb.  iDb==0 is used for the main
** database.  iDb==1 should never be used.  iDb>=2 is used for
** auxiliary databases.  Return one of the SQLITE_ error codes to
** indicate success or failure.







*/

static int sqliteInitOne(sqlite *db, int iDb, char **pzErrMsg){
  int rc;
  BtCursor *curMain;
  int size;
  Table *pTab;
  char *azArg[6];
  char zDbNum[30];
  int meta[SQLITE_N_BTREE_META];
  Parse sParse;
  InitData initData;

  /*
  ** The master database table has a structure like this
  */
................................................................................
     "UNION ALL "
     "SELECT type, name, rootpage, sql, 0 FROM sqlite_master "
     "WHERE type='table' "
     "UNION ALL "
     "SELECT type, name, rootpage, sql, 0 FROM sqlite_master "
     "WHERE type='index'";


  assert( iDb>=0 && iDb!=1 && iDb<db->nDb );

  /* Construct the schema tables: sqlite_master and sqlite_temp_master
  */
  azArg[0] = "table";
  azArg[1] = MASTER_NAME;
  azArg[2] = "2";
  azArg[3] = master_schema;
  sprintf(zDbNum, "%d", iDb);
  azArg[4] = zDbNum;
  azArg[5] = 0;
  initData.db = db;
  initData.pzErrMsg = pzErrMsg;
  sqliteInitCallback(&initData, 5, azArg, 0);
  pTab = sqliteFindTable(db, MASTER_NAME, "main");
  if( pTab ){
    pTab->readOnly = 1;
  }
  if( iDb==0 ){
    azArg[1] = TEMP_MASTER_NAME;
    azArg[3] = temp_master_schema;
    azArg[4] = "1";
    sqliteInitCallback(&initData, 5, azArg, 0);
    pTab = sqliteFindTable(db, TEMP_MASTER_NAME, "temp");
    if( pTab ){
      pTab->readOnly = 1;
    }
  }

  /* Create a cursor to hold the database open
  */
  if( db->aDb[iDb].pBt==0 ) return SQLITE_OK;
  rc = sqliteBtreeCursor(db->aDb[iDb].pBt, 2, 0, &curMain);
  if( rc ){
    sqliteSetString(pzErrMsg, sqlite_error_string(rc), 0);

    return rc;
  }

  /* Get the database meta information
  */
  rc = sqliteBtreeGetMeta(db->aDb[iDb].pBt, meta);
  if( rc ){
    sqliteSetString(pzErrMsg, sqlite_error_string(rc), 0);

    sqliteBtreeCloseCursor(curMain);
    return rc;
  }
  db->aDb[iDb].schema_cookie = meta[1];
  if( iDb==0 ){
    db->next_cookie = meta[1];
    db->file_format = meta[2];
    size = meta[3];
    if( size==0 ){ size = MAX_PAGES; }
    db->cache_size = size;

    db->safety_level = meta[4];
    if( db->safety_level==0 ) db->safety_level = 2;


    /*
    **  file_format==1    Version 2.1.0.
    **  file_format==2    Version 2.2.0. Add support for INTEGER PRIMARY KEY.
    **  file_format==3    Version 2.6.0. Fix empty-string index bug.
    **  file_format==4    Version 2.7.0. Add support for separate numeric and
    **                    text datatypes.
    */
    if( db->file_format==0 ){
      /* This happens if the database was initially empty */
      db->file_format = 4;
    }else if( db->file_format>4 ){
      sqliteBtreeCloseCursor(curMain);
      sqliteSetString(pzErrMsg, "unsupported file format", 0);
      return SQLITE_ERROR;
    }
  }else if( db->file_format<4 || db->file_format!=meta[2] ){
    sqliteSetString(pzErrMsg, "incompatible file format in auxiliary "
       "database \"", db->aDb[iDb].zName, "\"", 0);
    sqliteBtreeClose(db->aDb[iDb].pBt);
    db->aDb[iDb].pBt = 0;
    return SQLITE_FORMAT;
  }
  sqliteBtreeSetCacheSize(db->aDb[iDb].pBt, size);
  sqliteBtreeSetSafetyLevel(db->aDb[iDb].pBt, meta[4]==0 ? 2 : meta[4]);

  /* Read the schema information out of the schema tables
  */
  memset(&sParse, 0, sizeof(sParse));
  sParse.db = db;
  sParse.xCallback = sqliteInitCallback;
  sParse.pArg = (void*)&initData;
  sParse.initFlag = 1;
  sParse.useCallback = 1;
  if( iDb==0 ){
    sqliteRunParser(&sParse,
        db->file_format>=2 ? init_script : older_init_script,
        pzErrMsg);
  }else{
    char *zSql = 0;
    sqliteSetString(&zSql, 
       "SELECT type, name, rootpage, sql, ", zDbNum, " FROM \"",
       db->aDb[iDb].zName, "\".sqlite_master", 0);
    sqliteRunParser(&sParse, zSql, pzErrMsg);
    sqliteFree(zSql);
  }
  sqliteBtreeCloseCursor(curMain);
  if( sqlite_malloc_failed ){
    sqliteSetString(pzErrMsg, "out of memory", 0);
    sParse.rc = SQLITE_NOMEM;

    sqliteResetInternalSchema(db, 0);
  }
  if( sParse.rc==SQLITE_OK ){
    db->aDb[iDb].flags |= SQLITE_Initialized;
  }else{
    sqliteResetInternalSchema(db, iDb);
  }
  return sParse.rc;
}

/*
** Initialize all database files - the main database file, the file
** used to store temporary tables, and any additional database files
** created using ATTACH statements.  Return a success code.  If an
** error occurs, write an error message into *pzErrMsg.
**
** After the database is initialized, the SQLITE_Initialized
** bit is set in the flags field of the sqlite structure.  An
** attempt is made to initialize the database as soon as it
** is opened.  If that fails (perhaps because another process
** has the sqlite_master table locked) than another attempt
** is made the first time the database is accessed.
*/
int sqliteInit(sqlite *db, char **pzErrMsg){
  int i, rc;
  
  assert( (db->flags & SQLITE_Initialized)==0 );
  rc = SQLITE_OK;
  for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
    if( db->aDb[i].flags & SQLITE_Initialized ) continue;
    if( i==1 ) continue;  /* Skip the temp database - initialized with 0 */
    rc = sqliteInitOne(db, i, pzErrMsg);
  }
  if( rc==SQLITE_OK ){
    db->flags |= SQLITE_Initialized;
    sqliteCommitInternalChanges(db);
  }else{
    db->flags &= ~SQLITE_Initialized;

  }

  return rc;
}

/*
** The version of the library
*/
const char rcsid[] = "@(#) \044Id: SQLite version " SQLITE_VERSION " $";
const char sqlite_version[] = SQLITE_VERSION;
................................................................................
    /* printf("DID NOT CLOSE\n"); fflush(stdout); */
    return;
  }
  db->magic = SQLITE_MAGIC_CLOSED;
  for(j=0; j<db->nDb; j++){
    if( db->aDb[j].pBt ){
      sqliteBtreeClose(db->aDb[j].pBt);
      db->aDb[j].pBt = 0;
    }
    if( j>=2 ){
      sqliteFree(db->aDb[j].zName);
      db->aDb[j].zName = 0;
    }
  }



  sqliteResetInternalSchema(db, 0);
  assert( db->nDb<=2 );
  assert( db->aDb==db->aDbStatic );
  for(i=sqliteHashFirst(&db->aFunc); i; i=sqliteHashNext(i)){
    FuncDef *pFunc, *pNext;
    for(pFunc = (FuncDef*)sqliteHashData(i); pFunc; pFunc=pNext){
      pNext = pFunc->pNext;
      sqliteFree(pFunc);
    }
  }
................................................................................
  if( db->xTrace ) db->xTrace(db->pTraceArg, zSql);
#endif
  sqliteRunParser(&sParse, zSql, pzErrMsg);
  if( sqlite_malloc_failed ){
    sqliteSetString(pzErrMsg, "out of memory", 0);
    sParse.rc = SQLITE_NOMEM;
    sqliteRollbackAll(db);
    sqliteResetInternalSchema(db, 0);
    db->flags &= ~SQLITE_InTrans;
  }
  if( sParse.rc==SQLITE_DONE ) sParse.rc = SQLITE_OK;
  if( sParse.rc!=SQLITE_OK && pzErrMsg && *pzErrMsg==0 ){
    sqliteSetString(pzErrMsg, sqlite_error_string(sParse.rc), 0);
  }
  sqliteStrRealloc(pzErrMsg);
  if( sParse.rc==SQLITE_SCHEMA ){
    sqliteResetInternalSchema(db, 0);
  }
  if( sParse.useCallback==0 ){
    assert( ppVm );
    *ppVm = (sqlite_vm*)sParse.pVdbe;
    *pzTail = sParse.zTail;
  }
  if( sqliteSafetyOff(db) ) goto exec_misuse;

**
*************************************************************************
** This file contains SQLite's grammar for SQL.  Process this file
** using the lemon parser generator to generate C code that runs
** the parser.  Lemon will also generate a header file containing
** numeric codes for all of the tokens.
**
** @(#) $Id: parse.y,v 1.93 2003/03/27 12:51:25 drh Exp $
*/
%token_prefix TK_
%token_type {Token}
%default_type {Token}
%extra_argument {Parse *pParse}
%syntax_error {
  if( pParse->zErrMsg==0 ){
................................................................................
  A = sqliteExpr(TK_RAISE, 0, 0, &Z); 
  A->iColumn = OE_Fail;
  sqliteExprSpan(A, &X, &Y);
}

////////////////////////  DROP TRIGGER statement //////////////////////////////
cmd ::= DROP TRIGGER nm(X) dbnm(D). {
    sqliteDropTrigger(pParse,sqliteSrcListAppend(0,&X,&D),0);
}

//////////////////////// ATTACH DATABASE file AS name /////////////////////////
cmd ::= ATTACH database_kw_opt ids AS nm.



database_kw_opt ::= DATABASE.
database_kw_opt ::= .

//////////////////////// DETACH DATABASE name /////////////////////////////////
cmd ::= DETACH database_kw_opt nm.

**
*************************************************************************
** This file contains SQLite's grammar for SQL.  Process this file
** using the lemon parser generator to generate C code that runs
** the parser.  Lemon will also generate a header file containing
** numeric codes for all of the tokens.
**
** @(#) $Id: parse.y,v 1.94 2003/03/31 00:30:48 drh Exp $
*/
%token_prefix TK_
%token_type {Token}
%default_type {Token}
%extra_argument {Parse *pParse}
%syntax_error {
  if( pParse->zErrMsg==0 ){
................................................................................
  A = sqliteExpr(TK_RAISE, 0, 0, &Z); 
  A->iColumn = OE_Fail;
  sqliteExprSpan(A, &X, &Y);
}

////////////////////////  DROP TRIGGER statement //////////////////////////////
cmd ::= DROP TRIGGER nm(X) dbnm(D). {
  sqliteDropTrigger(pParse,sqliteSrcListAppend(0,&X,&D),0);
}

//////////////////////// ATTACH DATABASE file AS name /////////////////////////
cmd ::= ATTACH database_kw_opt ids(F) AS nm(D). {
  sqliteAttach(pParse, &F, &D);
}

database_kw_opt ::= DATABASE.
database_kw_opt ::= .

//////////////////////// DETACH DATABASE name /////////////////////////////////
cmd ::= DETACH database_kw_opt nm(D). {
  sqliteDetach(pParse, &D);
}

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This header file defines the interface that the SQLite library
** presents to client programs.
**
** @(#) $Id: sqlite.h.in,v 1.42 2003/03/30 19:17:03 drh Exp $
*/
#ifndef _SQLITE_H_
#define _SQLITE_H_
#include <stdarg.h>     /* Needed for the definition of va_list */

/*
** Make sure we can call this stuff from C++.
................................................................................
#define SQLITE_SCHEMA      17   /* The database schema changed */
#define SQLITE_TOOBIG      18   /* Too much data for one row of a table */
#define SQLITE_CONSTRAINT  19   /* Abort due to contraint violation */
#define SQLITE_MISMATCH    20   /* Data type mismatch */
#define SQLITE_MISUSE      21   /* Library used incorrectly */
#define SQLITE_NOLFS       22   /* Uses OS features not supported on host */
#define SQLITE_AUTH        23   /* Authorization denied */

#define SQLITE_ROW         100  /* sqlite_step() has another row ready */
#define SQLITE_DONE        101  /* sqlite_step() has finished executing */

/*
** Each entry in an SQLite table has a unique integer key.  (The key is
** the value of the INTEGER PRIMARY KEY column if there is such a column,
** otherwise the key is generated at random.  The unique key is always

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This header file defines the interface that the SQLite library
** presents to client programs.
**
** @(#) $Id: sqlite.h.in,v 1.43 2003/03/31 00:30:49 drh Exp $
*/
#ifndef _SQLITE_H_
#define _SQLITE_H_
#include <stdarg.h>     /* Needed for the definition of va_list */

/*
** Make sure we can call this stuff from C++.
................................................................................
#define SQLITE_SCHEMA      17   /* The database schema changed */
#define SQLITE_TOOBIG      18   /* Too much data for one row of a table */
#define SQLITE_CONSTRAINT  19   /* Abort due to contraint violation */
#define SQLITE_MISMATCH    20   /* Data type mismatch */
#define SQLITE_MISUSE      21   /* Library used incorrectly */
#define SQLITE_NOLFS       22   /* Uses OS features not supported on host */
#define SQLITE_AUTH        23   /* Authorization denied */
#define SQLITE_FORMAT      24   /* Auxiliary database format error */
#define SQLITE_ROW         100  /* sqlite_step() has another row ready */
#define SQLITE_DONE        101  /* sqlite_step() has finished executing */

/*
** Each entry in an SQLite table has a unique integer key.  (The key is
** the value of the INTEGER PRIMARY KEY column if there is such a column,
** otherwise the key is generated at random.  The unique key is always

**    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 1.166 2003/03/27 13:50:00 drh Exp $
*/
#include "config.h"
#include "sqlite.h"
#include "hash.h"
#include "vdbe.h"
#include "parse.h"
#include "btree.h"
................................................................................
void sqliteExec(Parse*);
Expr *sqliteExpr(int, Expr*, Expr*, Token*);
void sqliteExprSpan(Expr*,Token*,Token*);
Expr *sqliteExprFunction(ExprList*, Token*);
void sqliteExprDelete(Expr*);
ExprList *sqliteExprListAppend(ExprList*,Expr*,Token*);
void sqliteExprListDelete(ExprList*);

void sqlitePragma(Parse*,Token*,Token*,int);
void sqliteResetInternalSchema(sqlite*);
int sqliteInit(sqlite*, char**);
void sqliteBeginParse(Parse*,int);
void sqliteRollbackInternalChanges(sqlite*);
void sqliteCommitInternalChanges(sqlite*);
Table *sqliteResultSetOfSelect(Parse*,char*,Select*);
void sqliteOpenMasterTable(Vdbe *v, int);
void sqliteStartTable(Parse*,Token*,Token*,int,int);
void sqliteAddColumn(Parse*,Token*);
................................................................................
#ifndef SQLITE_OMIT_AUTHORIZATION
  void sqliteAuthRead(Parse*,Expr*,SrcList*,int);
  int sqliteAuthCheck(Parse*,int, const char*, const char*);
#else
# define sqliteAuthRead(a,b,c,d)
# define sqliteAuthCheck(a,b,c,d)    SQLITE_OK
#endif

**    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 1.167 2003/03/31 00:30:49 drh Exp $
*/
#include "config.h"
#include "sqlite.h"
#include "hash.h"
#include "vdbe.h"
#include "parse.h"
#include "btree.h"
................................................................................
void sqliteExec(Parse*);
Expr *sqliteExpr(int, Expr*, Expr*, Token*);
void sqliteExprSpan(Expr*,Token*,Token*);
Expr *sqliteExprFunction(ExprList*, Token*);
void sqliteExprDelete(Expr*);
ExprList *sqliteExprListAppend(ExprList*,Expr*,Token*);
void sqliteExprListDelete(ExprList*);
int sqliteInit(sqlite*, char**);
void sqlitePragma(Parse*,Token*,Token*,int);
void sqliteResetInternalSchema(sqlite*, int);

void sqliteBeginParse(Parse*,int);
void sqliteRollbackInternalChanges(sqlite*);
void sqliteCommitInternalChanges(sqlite*);
Table *sqliteResultSetOfSelect(Parse*,char*,Select*);
void sqliteOpenMasterTable(Vdbe *v, int);
void sqliteStartTable(Parse*,Token*,Token*,int,int);
void sqliteAddColumn(Parse*,Token*);
................................................................................
#ifndef SQLITE_OMIT_AUTHORIZATION
  void sqliteAuthRead(Parse*,Expr*,SrcList*,int);
  int sqliteAuthCheck(Parse*,int, const char*, const char*);
#else
# define sqliteAuthRead(a,b,c,d)
# define sqliteAuthCheck(a,b,c,d)    SQLITE_OK
#endif
void sqliteAttach(Parse*, Token*, Token*);
void sqliteDetach(Parse*, Token*);