**     DROP INDEX
**     creating ID lists
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**     PRAGMA
**
** $Id: build.c,v 1.167 2004/02/13 16:22:23 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
................................................................................
      pParse->pVdbe = 0;
      pParse->rc = rc;
      if( rc ) pParse->nErr++;
    }else{
      pParse->rc = pParse->nErr ? SQLITE_ERROR : SQLITE_DONE;
    }
    pParse->colNamesSet = 0;
  }else if( pParse->useCallback==0 ){
    pParse->rc = SQLITE_ERROR;
  }
  pParse->nTab = 0;
  pParse->nMem = 0;
  pParse->nSet = 0;
  pParse->nAgg = 0;
  pParse->nVar = 0;

**     DROP INDEX
**     creating ID lists
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**     PRAGMA
**
** $Id: build.c,v 1.168 2004/02/14 16:31:03 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
................................................................................
      pParse->pVdbe = 0;
      pParse->rc = rc;
      if( rc ) pParse->nErr++;
    }else{
      pParse->rc = pParse->nErr ? SQLITE_ERROR : SQLITE_DONE;
    }
    pParse->colNamesSet = 0;
  }else if( pParse->useCallback==0 && pParse->rc==SQLITE_OK ){
    pParse->rc = SQLITE_ERROR;
  }
  pParse->nTab = 0;
  pParse->nMem = 0;
  pParse->nSet = 0;
  pParse->nAgg = 0;
  pParse->nVar = 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 1.151 2004/02/13 16:30:10 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
** A pointer to this structure is used to communicate information
................................................................................
  rc = sqlite_exec_printf(pData->db,
    "CREATE TEMP TABLE sqlite_x AS SELECT * FROM '%q'; "
    "DELETE FROM '%q'; "
    "INSERT INTO '%q' SELECT * FROM sqlite_x; "
    "DROP TABLE sqlite_x;",
    0, 0, &zErr, argv[0], argv[0], argv[0]);
  if( zErr ){
    sqliteSetString(pData->pzErrMsg, zErr, (char*)0);
    sqlite_freemem(zErr);
  }

  /* If an error occurred in the SQL above, then the transaction will
  ** rollback which will delete the internal symbol tables.  This will
  ** cause the structure that pTab points to be deleted.  In case that
  ** happened, we need to refetch pTab.
  */
................................................................................
    }
  }
  sqliteResetInternalSchema(db, 0);
  /* sqliteRollbackInternalChanges(db); */
}

/*
** This routine does the work of either sqlite_exec() or sqlite_compile().
** It works like sqlite_exec() if pVm==NULL and it works like sqlite_compile()
** otherwise.





*/
static int sqliteMain(
  sqlite *db,                 /* The database on which the SQL executes */
  const char *zSql,           /* The SQL to be executed */
  sqlite_callback xCallback,  /* Invoke this callback routine */
  void *pArg,                 /* First argument to xCallback() */



























































  const char **pzTail,        /* OUT: Next statement after the first */
  sqlite_vm **ppVm,           /* OUT: The virtual machine */
  char **pzErrMsg             /* OUT: Write error messages here */
){
  Parse sParse;

  if( pzErrMsg ) *pzErrMsg = 0;
................................................................................
    sqliteSafetyOff(db);
    sqliteSetString(pzErrMsg, "obsolete database file format", (char*)0);
    return SQLITE_ERROR;
  }
  if( db->pVdbe==0 ){ db->nChange = 0; }
  memset(&sParse, 0, sizeof(sParse));
  sParse.db = db;
  sParse.xCallback = xCallback;
  sParse.pArg = pArg;
  sParse.useCallback = ppVm==0;
  if( db->xTrace ) db->xTrace(db->pTraceArg, zSql);
  sqliteRunParser(&sParse, zSql, pzErrMsg);
  if( sqlite_malloc_failed ){
    sqliteSetString(pzErrMsg, "out of memory", (char*)0);
    sParse.rc = SQLITE_NOMEM;
    sqliteRollbackAll(db);
    sqliteResetInternalSchema(db, 0);
................................................................................
  if( sParse.rc!=SQLITE_OK && pzErrMsg && *pzErrMsg==0 ){
    sqliteSetString(pzErrMsg, sqlite_error_string(sParse.rc), (char*)0);
  }
  sqliteStrRealloc(pzErrMsg);
  if( sParse.rc==SQLITE_SCHEMA ){
    sqliteResetInternalSchema(db, 0);
  }
  if( sParse.useCallback==0 ){
    assert( ppVm );
    *ppVm = (sqlite_vm*)sParse.pVdbe;
    if( pzTail ) *pzTail = sParse.zTail;
  }
  if( sqliteSafetyOff(db) ) goto exec_misuse;
  return sParse.rc;

exec_misuse:
  if( pzErrMsg ){
    *pzErrMsg = 0;
    sqliteSetString(pzErrMsg, sqlite_error_string(SQLITE_MISUSE), (char*)0);
    sqliteStrRealloc(pzErrMsg);
  }
  return SQLITE_MISUSE;
}

/*
** Execute SQL code.  Return one of the SQLITE_ success/failure
** codes.  Also write an error message into memory obtained from
** malloc() and make *pzErrMsg point to that message.
**
** If the SQL is a query, then for each row in the query result
** the xCallback() function is called.  pArg becomes the first
** argument to xCallback().  If xCallback=NULL then no callback
** is invoked, even for queries.
*/
int sqlite_exec(
  sqlite *db,                 /* The database on which the SQL executes */
  const char *zSql,           /* The SQL to be executed */
  sqlite_callback xCallback,  /* Invoke this callback routine */
  void *pArg,                 /* First argument to xCallback() */
  char **pzErrMsg             /* Write error messages here */
){
#if 1
  return sqliteMain(db, zSql, xCallback, pArg, 0, 0, pzErrMsg);
#else
  int rc;
  const char *zLeftover;
  sqlite_vm *pVm;

  if( zSql==0 ) return SQLITE_OK;
  while( zSql[0] ){
    int nBusy = 0;
    rc = sqlite_compile(db, zSql, &zLeftover, &pVm, pzErrMsg);
    if( rc!=SQLITE_OK ){
      /* sqlite_finalize(pVm, 0); */
      return rc;
    }
    while(1){
      int nArg;
      char **azArg, **azCol;
      rc = sqlite_step(pVm, &nArg, &azArg, &azCol);
      if( rc==SQLITE_ROW ){
        if( xCallback(pArg, nArg, azArg, azCol) ){
          sqlite_finalize(pVm, 0);
          return SQLITE_ABORT;
        }
#if 0
      }else if( rc==SQLITE_BUSY ){
        if( db->xBusyCallback==0
              || db->xBusyCallback(db->pBusyArg, "", nBusy++)==0 ){
          sqlite_finalize(pVm, 0);
          return SQLITE_BUSY;
        }
#endif
      }else if( rc==SQLITE_SCHEMA ){
        sqlite_finalize(pVm, 0);
        break;
      }else{
        rc = sqlite_finalize(pVm, pzErrMsg);
        if( rc==SQLITE_SCHEMA ){
          sqliteResetInternalSchema(db, 0);
          /* break; */
        }
        if( rc!=SQLITE_OK ){
          return rc;
        }
        zSql = zLeftover;
        while( isspace(zSql[0]) ) zSql++;
        break;
      }
    }
  }
  return SQLITE_OK;
#endif
}


/*
** Compile a single statement of SQL into a virtual machine.  Return one
** of the SQLITE_ success/failure codes.  Also write an error message into
** memory obtained from malloc() and make *pzErrMsg point to that message.
*/
int sqlite_compile(
  sqlite *db,                 /* The database on which the SQL executes */
  const char *zSql,           /* The SQL to be executed */
  const char **pzTail,        /* OUT: Next statement after the first */
  sqlite_vm **ppVm,           /* OUT: The virtual machine */
  char **pzErrMsg             /* OUT: Write error messages here */
){
  return sqliteMain(db, zSql, 0, 0, pzTail, ppVm, pzErrMsg);
}


/*
** The following routine destroys a virtual machine that is created by
** the sqlite_compile() routine.
**
** The integer returned is an SQLITE_ success/failure code that describes
** the result of executing the virtual machine.  An error message is

**
*************************************************************************
** 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 1.152 2004/02/14 16:31:03 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
** A pointer to this structure is used to communicate information
................................................................................
  rc = sqlite_exec_printf(pData->db,
    "CREATE TEMP TABLE sqlite_x AS SELECT * FROM '%q'; "
    "DELETE FROM '%q'; "
    "INSERT INTO '%q' SELECT * FROM sqlite_x; "
    "DROP TABLE sqlite_x;",
    0, 0, &zErr, argv[0], argv[0], argv[0]);
  if( zErr ){
    if( *pData->pzErrMsg ) sqlite_freemem(*pData->pzErrMsg);
    *pData->pzErrMsg = zErr;
  }

  /* If an error occurred in the SQL above, then the transaction will
  ** rollback which will delete the internal symbol tables.  This will
  ** cause the structure that pTab points to be deleted.  In case that
  ** happened, we need to refetch pTab.
  */
................................................................................
    }
  }
  sqliteResetInternalSchema(db, 0);
  /* sqliteRollbackInternalChanges(db); */
}

/*
** Execute SQL code.  Return one of the SQLITE_ success/failure
** codes.  Also write an error message into memory obtained from
** malloc() and make *pzErrMsg point to that message.
**
** If the SQL is a query, then for each row in the query result
** the xCallback() function is called.  pArg becomes the first
** argument to xCallback().  If xCallback=NULL then no callback
** is invoked, even for queries.
*/
int sqlite_exec(
  sqlite *db,                 /* The database on which the SQL executes */
  const char *zSql,           /* The SQL to be executed */
  sqlite_callback xCallback,  /* Invoke this callback routine */
  void *pArg,                 /* First argument to xCallback() */
  char **pzErrMsg             /* Write error messages here */
){
  int rc = SQLITE_OK;
  const char *zLeftover;
  sqlite_vm *pVm;
  int nRetry = 0;
  int nChange = 0;

  if( zSql==0 ) return SQLITE_OK;
  while( rc==SQLITE_OK && zSql[0] ){
    pVm = 0;
    rc = sqlite_compile(db, zSql, &zLeftover, &pVm, pzErrMsg);
    if( rc!=SQLITE_OK ){
      assert( pVm==0 );
      return rc;
    }
    if( pVm==0 ){
      /* This happens if the zSql input contained only whitespace */
      break;
    }
    db->nChange += nChange;
    while(1){
      int nArg;
      char **azArg, **azCol;
      rc = sqlite_step(pVm, &nArg, (const char***)&azArg,(const char***)&azCol);
      if( rc==SQLITE_ROW ){
        if( xCallback(pArg, nArg, azArg, azCol) ){
          sqlite_finalize(pVm, 0);
          return SQLITE_ABORT;
        }
      }else{
        rc = sqlite_finalize(pVm, pzErrMsg);
        if( rc==SQLITE_SCHEMA && nRetry<2 ){
          nRetry++;
          rc = SQLITE_OK;
          break;
        }
        if( db->pVdbe==0 ){
          nChange = db->nChange;
        }
        nRetry = 0;
        zSql = zLeftover;
        while( isspace(zSql[0]) ) zSql++;
        break;
      }
    }
  }
  return rc;
}


/*
** Compile a single statement of SQL into a virtual machine.  Return one
** of the SQLITE_ success/failure codes.  Also write an error message into
** memory obtained from malloc() and make *pzErrMsg point to that message.
*/
int sqlite_compile(
  sqlite *db,                 /* The database on which the SQL executes */
  const char *zSql,           /* The SQL to be executed */
  const char **pzTail,        /* OUT: Next statement after the first */
  sqlite_vm **ppVm,           /* OUT: The virtual machine */
  char **pzErrMsg             /* OUT: Write error messages here */
){
  Parse sParse;

  if( pzErrMsg ) *pzErrMsg = 0;
................................................................................
    sqliteSafetyOff(db);
    sqliteSetString(pzErrMsg, "obsolete database file format", (char*)0);
    return SQLITE_ERROR;
  }
  if( db->pVdbe==0 ){ db->nChange = 0; }
  memset(&sParse, 0, sizeof(sParse));
  sParse.db = db;


  sParse.useCallback = 0;
  if( db->xTrace ) db->xTrace(db->pTraceArg, zSql);
  sqliteRunParser(&sParse, zSql, pzErrMsg);
  if( sqlite_malloc_failed ){
    sqliteSetString(pzErrMsg, "out of memory", (char*)0);
    sParse.rc = SQLITE_NOMEM;
    sqliteRollbackAll(db);
    sqliteResetInternalSchema(db, 0);
................................................................................
  if( sParse.rc!=SQLITE_OK && pzErrMsg && *pzErrMsg==0 ){
    sqliteSetString(pzErrMsg, sqlite_error_string(sParse.rc), (char*)0);
  }
  sqliteStrRealloc(pzErrMsg);
  if( sParse.rc==SQLITE_SCHEMA ){
    sqliteResetInternalSchema(db, 0);
  }

  assert( ppVm );
  *ppVm = (sqlite_vm*)sParse.pVdbe;
  if( pzTail ) *pzTail = sParse.zTail;

  if( sqliteSafetyOff(db) ) goto exec_misuse;
  return sParse.rc;

exec_misuse:
  if( pzErrMsg ){
    *pzErrMsg = 0;
    sqliteSetString(pzErrMsg, sqlite_error_string(SQLITE_MISUSE), (char*)0);
    sqliteStrRealloc(pzErrMsg);
  }
  return SQLITE_MISUSE;
}

























































































/*
** The following routine destroys a virtual machine that is created by
** the sqlite_compile() routine.
**
** The integer returned is an SQLITE_ success/failure code that describes
** the result of executing the virtual machine.  An error message is

**    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 SELECT statements in SQLite.
**
** $Id: select.c,v 1.153 2004/02/13 16:22:23 drh Exp $
*/
#include "sqliteInt.h"


/*
** Allocate a new Select structure and return a pointer to that
** structure.
................................................................................
    sqliteErrorMsg(pParse, "SELECTs to the left and right of %s"
      " do not have the same number of result columns", selectOpName(p->op));
    return 1;
  }

  /* Issue a null callback if that is what the user wants.
  */
  if( eDest==SRT_Callback &&
    (pParse->useCallback==0 || (pParse->db->flags & SQLITE_NullCallback)!=0)
  ){
    sqliteVdbeAddOp(v, OP_NullCallback, p->pEList->nExpr, 0);
  }
  return 0;
}

/*
................................................................................
  if( pOrderBy ){
    generateSortTail(p, v, pEList->nExpr, eDest, iParm);
  }


  /* Issue a null callback if that is what the user wants.
  */
  if( eDest==SRT_Callback &&
    (pParse->useCallback==0 || (pParse->db->flags & SQLITE_NullCallback)!=0)
  ){
    sqliteVdbeAddOp(v, OP_NullCallback, pEList->nExpr, 0);
  }

  /* If this was a subquery, we have now converted the subquery into a
  ** temporary table.  So delete the subquery structure from the parent
  ** to prevent this subquery from being evaluated again and to force the

**    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 SELECT statements in SQLite.
**
** $Id: select.c,v 1.154 2004/02/14 16:31:04 drh Exp $
*/
#include "sqliteInt.h"


/*
** Allocate a new Select structure and return a pointer to that
** structure.
................................................................................
    sqliteErrorMsg(pParse, "SELECTs to the left and right of %s"
      " do not have the same number of result columns", selectOpName(p->op));
    return 1;
  }

  /* Issue a null callback if that is what the user wants.
  */
  if( eDest==SRT_Callback /* &&
    (pParse->useCallback==0 || (pParse->db->flags & SQLITE_NullCallback)!=0) */
  ){
    sqliteVdbeAddOp(v, OP_NullCallback, p->pEList->nExpr, 0);
  }
  return 0;
}

/*
................................................................................
  if( pOrderBy ){
    generateSortTail(p, v, pEList->nExpr, eDest, iParm);
  }


  /* Issue a null callback if that is what the user wants.
  */
  if( eDest==SRT_Callback /* &&
    (pParse->useCallback==0 || (pParse->db->flags & SQLITE_NullCallback)!=0) */
  ){
    sqliteVdbeAddOp(v, OP_NullCallback, pEList->nExpr, 0);
  }

  /* If this was a subquery, we have now converted the subquery into a
  ** temporary table.  So delete the subquery structure from the parent
  ** to prevent this subquery from being evaluated again and to force the

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains code to implement the "sqlite" command line
** utility for accessing SQLite databases.
**
** $Id: shell.c,v 1.89 2004/02/13 20:09:42 drh Exp $
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "sqlite.h"
#include <ctype.h>

................................................................................
    if( p->out!=stdout ){
      fclose(p->out);
    }
    if( strcmp(azArg[1],"stdout")==0 ){
      p->out = stdout;
      strcpy(p->outfile,"stdout");
    }else{
      p->out = fopen(azArg[1], "w");
      if( p->out==0 ){
        fprintf(stderr,"can't write to \"%s\"\n", azArg[1]);
        p->out = stdout;
      } else {
         strcpy(p->outfile,azArg[1]);
      }
    }
................................................................................

  if( c=='q' && strncmp(azArg[0], "quit", n)==0 ){
    if( p->db ) sqlite_close(p->db);
    exit(0);
  }else

  if( c=='r' && strncmp(azArg[0], "read", n)==0 && nArg==2 ){
    FILE *alt = fopen(azArg[1], "r");
    if( alt==0 ){
      fprintf(stderr,"can't open \"%s\"\n", azArg[1]);
    }else{
      process_input(p, alt);
      fclose(alt);
    }
  }else
................................................................................
      fprintf(stderr,"%s: out of memory!\n", Argv0);
      exit(1);
    }
    sprintf(zBuf,"%s/.sqliterc",home_dir);
    free(home_dir);
    sqliterc = (const char*)zBuf;
  }
  in = fopen(sqliterc,"r");
  if( in ){
    if( isatty(fileno(stdout)) ){
      printf("Loading resources from %s\n",sqliterc);
    }
    process_input(p,in);
    fclose(in);
  }

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains code to implement the "sqlite" command line
** utility for accessing SQLite databases.
**
** $Id: shell.c,v 1.90 2004/02/14 16:31:04 drh Exp $
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "sqlite.h"
#include <ctype.h>

................................................................................
    if( p->out!=stdout ){
      fclose(p->out);
    }
    if( strcmp(azArg[1],"stdout")==0 ){
      p->out = stdout;
      strcpy(p->outfile,"stdout");
    }else{
      p->out = fopen(azArg[1], "wb");
      if( p->out==0 ){
        fprintf(stderr,"can't write to \"%s\"\n", azArg[1]);
        p->out = stdout;
      } else {
         strcpy(p->outfile,azArg[1]);
      }
    }
................................................................................

  if( c=='q' && strncmp(azArg[0], "quit", n)==0 ){
    if( p->db ) sqlite_close(p->db);
    exit(0);
  }else

  if( c=='r' && strncmp(azArg[0], "read", n)==0 && nArg==2 ){
    FILE *alt = fopen(azArg[1], "rb");
    if( alt==0 ){
      fprintf(stderr,"can't open \"%s\"\n", azArg[1]);
    }else{
      process_input(p, alt);
      fclose(alt);
    }
  }else
................................................................................
      fprintf(stderr,"%s: out of memory!\n", Argv0);
      exit(1);
    }
    sprintf(zBuf,"%s/.sqliterc",home_dir);
    free(home_dir);
    sqliterc = (const char*)zBuf;
  }
  in = fopen(sqliterc,"rb");
  if( in ){
    if( isatty(fileno(stdout)) ){
      printf("Loading resources from %s\n",sqliterc);
    }
    process_input(p,in);
    fclose(in);
  }

**
** 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 1.261 2004/02/13 14:07:13 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include "vdbeInt.h"

/*
................................................................................
  int rc;

  if( p->magic!=VDBE_MAGIC_RUN ){
    return SQLITE_MISUSE;
  }
  db = p->db;
  if( sqliteSafetyOn(db) ){

    return SQLITE_MISUSE;
  }
  if( p->explain ){
    rc = sqliteVdbeList(p);
  }else{
    rc = sqliteVdbeExec(p);
  }
................................................................................
      azArgv[i] = 0;
    }else{
      Stringify(pCol);
      azArgv[i] = pCol->z;
    }
  }
  azArgv[i] = 0;

  if( p->xCallback==0 ){
    p->azResColumn = azArgv;
    p->nResColumn = pOp->p1;
    p->popStack = pOp->p1;
    p->pc = pc + 1;
    p->pTos = pTos;
    return SQLITE_ROW;
  }
  if( sqliteSafetyOff(db) ) goto abort_due_to_misuse; 
  if( p->xCallback(p->pCbArg, pOp->p1, azArgv, p->azColName)!=0 ){
    rc = SQLITE_ABORT;
  }
  if( sqliteSafetyOn(db) ) goto abort_due_to_misuse;
  p->nCallback++;
  popStack(&pTos, pOp->p1);
  assert( pTos>=&p->aStack[-1] );
  if( sqlite_malloc_failed ) goto no_mem;
  break;
}

/* Opcode: NullCallback P1 * *
................................................................................
** The callback is only invoked if there have been no prior calls
** to OP_Callback or OP_SortCallback.
**
** This opcode is used to report the number and names of columns
** in cases where the result set is empty.
*/
case OP_NullCallback: {

  if( p->nCallback==0 && p->xCallback!=0 ){
    if( sqliteSafetyOff(db) ) goto abort_due_to_misuse; 
    if( p->xCallback(p->pCbArg, pOp->p1, 0, p->azColName)!=0 ){
      rc = SQLITE_ABORT;
    }
    if( sqliteSafetyOn(db) ) goto abort_due_to_misuse;
    p->nCallback++;
    if( sqlite_malloc_failed ) goto no_mem;









  }
  p->nResColumn = pOp->p1;
  break;
}

/* Opcode: Concat P1 P2 P3
**
................................................................................
** the SortMakeRec operation with the same P1 value as this
** instruction.  Pop this record from the stack and invoke the
** callback on it.
*/
case OP_SortCallback: {
  assert( pTos>=p->aStack );
  assert( pTos->flags & MEM_Str );

  if( p->xCallback==0 ){
    p->pc = pc+1;
    p->azResColumn = (char**)pTos->z;
    p->nResColumn = pOp->p1;
    p->popStack = 1;
    p->pTos = pTos;
    return SQLITE_ROW;
  }else{
    if( sqliteSafetyOff(db) ) goto abort_due_to_misuse;
    if( p->xCallback(p->pCbArg, pOp->p1, (char**)pTos->z, p->azColName)!=0){
      rc = SQLITE_ABORT;
    }
    if( sqliteSafetyOn(db) ) goto abort_due_to_misuse;
    p->nCallback++;
  }
  Release(pTos);
  pTos--;
  if( sqlite_malloc_failed ) goto no_mem;
  break;
}

**
** 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 1.262 2004/02/14 16:31:04 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include "vdbeInt.h"

/*
................................................................................
  int rc;

  if( p->magic!=VDBE_MAGIC_RUN ){
    return SQLITE_MISUSE;
  }
  db = p->db;
  if( sqliteSafetyOn(db) ){
    p->rc = SQLITE_MISUSE;
    return SQLITE_MISUSE;
  }
  if( p->explain ){
    rc = sqliteVdbeList(p);
  }else{
    rc = sqliteVdbeExec(p);
  }
................................................................................
      azArgv[i] = 0;
    }else{
      Stringify(pCol);
      azArgv[i] = pCol->z;
    }
  }
  azArgv[i] = 0;
  p->nCallback++;
  if( p->xCallback==0 ){
    p->azResColumn = azArgv;
    p->nResColumn = pOp->p1;
    p->popStack = pOp->p1;
    p->pc = pc + 1;
    p->pTos = pTos;
    return SQLITE_ROW;
  }
  if( sqliteSafetyOff(db) ) goto abort_due_to_misuse; 
  if( p->xCallback(p->pCbArg, pOp->p1, azArgv, p->azColName)!=0 ){
    rc = SQLITE_ABORT;
  }
  if( sqliteSafetyOn(db) ) goto abort_due_to_misuse;

  popStack(&pTos, pOp->p1);
  assert( pTos>=&p->aStack[-1] );
  if( sqlite_malloc_failed ) goto no_mem;
  break;
}

/* Opcode: NullCallback P1 * *
................................................................................
** The callback is only invoked if there have been no prior calls
** to OP_Callback or OP_SortCallback.
**
** This opcode is used to report the number and names of columns
** in cases where the result set is empty.
*/
case OP_NullCallback: {
  if( p->nCallback==0 && (db->flags & SQLITE_NullCallback)!=0 ){
    if( p->xCallback!=0 ){
      if( sqliteSafetyOff(db) ) goto abort_due_to_misuse; 
      if( p->xCallback(p->pCbArg, pOp->p1, 0, p->azColName)!=0 ){
        rc = SQLITE_ABORT;
      }
      if( sqliteSafetyOn(db) ) goto abort_due_to_misuse;

      if( sqlite_malloc_failed ) goto no_mem;
    }else{
      p->azResColumn = 0;
      p->nResColumn = pOp->p1;
      p->popStack = 0;
      p->pc = pc + 1;
      p->pTos = pTos;
      return SQLITE_ROW;
    }
    p->nCallback++;
  }
  p->nResColumn = pOp->p1;
  break;
}

/* Opcode: Concat P1 P2 P3
**
................................................................................
** the SortMakeRec operation with the same P1 value as this
** instruction.  Pop this record from the stack and invoke the
** callback on it.
*/
case OP_SortCallback: {
  assert( pTos>=p->aStack );
  assert( pTos->flags & MEM_Str );
  p->nCallback++;
  if( p->xCallback==0 ){
    p->pc = pc+1;
    p->azResColumn = (char**)pTos->z;
    p->nResColumn = pOp->p1;
    p->popStack = 1;
    p->pTos = pTos;
    return SQLITE_ROW;
  }else{
    if( sqliteSafetyOff(db) ) goto abort_due_to_misuse;
    if( p->xCallback(p->pCbArg, pOp->p1, (char**)pTos->z, p->azColName)!=0){
      rc = SQLITE_ABORT;
    }
    if( sqliteSafetyOn(db) ) goto abort_due_to_misuse;

  }
  Release(pTos);
  pTos--;
  if( sqlite_malloc_failed ) goto no_mem;
  break;
}

  if( p->zErrMsg ){
    if( pzErrMsg && *pzErrMsg==0 ){
      *pzErrMsg = p->zErrMsg;
    }else{
      sqliteFree(p->zErrMsg);
    }
    p->zErrMsg = 0;


  }
  Cleanup(p);
  if( p->rc!=SQLITE_OK ){
    switch( p->errorAction ){
      case OE_Abort: {
        if( !p->undoTransOnError ){
          for(i=0; i<db->nDb; i++){
................................................................................
  }
  db = p->db;
  rc = sqliteVdbeReset(p, pzErrMsg);
  sqliteVdbeDelete(p);
  if( db->want_to_close && db->pVdbe==0 ){
    sqlite_close(db);
  }



  return rc;
}

/*
** Set the values of all variables.  Variable $1 in the original SQL will
** be the string azValue[0].  $2 will have the value azValue[1].  And
** so forth.  If a value is out of range (for example $3 when nValue==2)

  if( p->zErrMsg ){
    if( pzErrMsg && *pzErrMsg==0 ){
      *pzErrMsg = p->zErrMsg;
    }else{
      sqliteFree(p->zErrMsg);
    }
    p->zErrMsg = 0;
  }else if( p->rc ){
    sqliteSetString(pzErrMsg, sqlite_error_string(p->rc), (char*)0);
  }
  Cleanup(p);
  if( p->rc!=SQLITE_OK ){
    switch( p->errorAction ){
      case OE_Abort: {
        if( !p->undoTransOnError ){
          for(i=0; i<db->nDb; i++){
................................................................................
  }
  db = p->db;
  rc = sqliteVdbeReset(p, pzErrMsg);
  sqliteVdbeDelete(p);
  if( db->want_to_close && db->pVdbe==0 ){
    sqlite_close(db);
  }
  if( rc==SQLITE_SCHEMA ){
    sqliteResetInternalSchema(db, 0);
  }
  return rc;
}

/*
** Set the values of all variables.  Variable $1 in the original SQL will
** be the string azValue[0].  $2 will have the value azValue[1].  And
** so forth.  If a value is out of range (for example $3 when nValue==2)

#    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 script is database locks.
#
# $Id: lock.test,v 1.19 2004/01/15 13:29:40 drh Exp $


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

# Create an alternative connection to the database
#
................................................................................
do_test lock-1.2 {
  execsql {SELECT name FROM sqlite_master WHERE type='table' ORDER BY name} db2
} {}
do_test lock-1.3 {
  execsql {CREATE TABLE t1(a int, b int)}
  execsql {SELECT name FROM sqlite_master WHERE type='table' ORDER BY name}
} {t1}
do_test lock-1.4 {
  catchsql {
    SELECT name FROM sqlite_master WHERE type='table' ORDER BY name
  } db2
} {1 {database schema has changed}}
do_test lock-1.5 {
  catchsql {
     SELECT name FROM sqlite_master WHERE type='table' ORDER BY name
  } db2
} {0 t1}

do_test lock-1.6 {
................................................................................
} {0 {2 1}}

do_test lock-1.13 {
  execsql {CREATE TABLE t2(x int, y int)}
  execsql {INSERT INTO t2 VALUES(8,9)}
  execsql {SELECT * FROM t2}
} {8 9}
do_test lock-1.14 {
  catchsql {SELECT * FROM t1} db2
} {1 {database schema has changed}}



do_test lock-1.15 {
  catchsql {SELECT * FROM t2} db2
} {0 {8 9}}

do_test lock-1.16 {
  db eval {SELECT * FROM t1} qv {
    set x [db eval {SELECT * FROM t1}]

#    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 script is database locks.
#
# $Id: lock.test,v 1.20 2004/02/14 16:31:04 drh Exp $


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

# Create an alternative connection to the database
#
................................................................................
do_test lock-1.2 {
  execsql {SELECT name FROM sqlite_master WHERE type='table' ORDER BY name} db2
} {}
do_test lock-1.3 {
  execsql {CREATE TABLE t1(a int, b int)}
  execsql {SELECT name FROM sqlite_master WHERE type='table' ORDER BY name}
} {t1}
#do_test lock-1.4 {
#  catchsql {
#    SELECT name FROM sqlite_master WHERE type='table' ORDER BY name
#  } db2
#} {1 {database schema has changed}}
do_test lock-1.5 {
  catchsql {
     SELECT name FROM sqlite_master WHERE type='table' ORDER BY name
  } db2
} {0 t1}

do_test lock-1.6 {
................................................................................
} {0 {2 1}}

do_test lock-1.13 {
  execsql {CREATE TABLE t2(x int, y int)}
  execsql {INSERT INTO t2 VALUES(8,9)}
  execsql {SELECT * FROM t2}
} {8 9}
do_test lock-1.14.1 {
  catchsql {SELECT * FROM t2} db2
} {1 {no such table: t2}}
do_test lock-1.14.2 {
  catchsql {SELECT * FROM t1} db2
} {0 {2 1}}
do_test lock-1.15 {
  catchsql {SELECT * FROM t2} db2
} {0 {8 9}}

do_test lock-1.16 {
  db eval {SELECT * FROM t1} qv {
    set x [db eval {SELECT * FROM t1}]

#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.
#
# This file implements tests for temporary tables and indices.
#
# $Id: temptable.test,v 1.10 2003/05/17 17:35:13 drh Exp $

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

# Create an alternative connection to the database
#
do_test temptable-1.0 {
................................................................................
  } db2
} {0 {10 20}}
do_test temptable-4.4.2 {
  catchsql {
    SELECT * FROM main.t2;
  } db2
} {1 {no such table: main.t2}}
do_test temptable-4.4.3 {
  catchsql {
    SELECT name FROM main.sqlite_master WHERE type='table';
  } db2
} {1 {database schema has changed}}
do_test temptable-4.4.4 {
  catchsql {
    SELECT name FROM main.sqlite_master WHERE type='table';
  } db2
} {0 {t1 t2}}
do_test temptable-4.4.5 {
  catchsql {
................................................................................
  }
} {3 4}
do_test temptable-4.10.1 {
  catchsql {
    SELECT * FROM t2;
  } db2
} {0 {1 2}}
do_test temptable-4.10.2 {
  catchsql {
    SELECT name FROM sqlite_master WHERE type='table'
  } db2
} {1 {database schema has changed}}
do_test temptable-4.10.3 {
  catchsql {
    SELECT name FROM sqlite_master WHERE type='table'
  } db2
} {0 {t1 t2}}
do_test temptable-4.11 {
  execsql {
................................................................................
    CREATE TEMP TABLE mask(a,b,c)
  } db2
  execsql {
    CREATE INDEX mask ON t2(x);
    SELECT * FROM t2;
  }
} {3 4}
do_test temptable-5.2 {
  catchsql {
    SELECT * FROM t2;
  } db2
} {1 {database schema has changed}}
do_test temptable-5.3 {
  catchsql {
    SELECT * FROM t2;
  } db2
} {0 {3 4}}
do_test temptable-5.4 {
  execsql {

#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.
#
# This file implements tests for temporary tables and indices.
#
# $Id: temptable.test,v 1.11 2004/02/14 16:31:04 drh Exp $

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

# Create an alternative connection to the database
#
do_test temptable-1.0 {
................................................................................
  } db2
} {0 {10 20}}
do_test temptable-4.4.2 {
  catchsql {
    SELECT * FROM main.t2;
  } db2
} {1 {no such table: main.t2}}
#do_test temptable-4.4.3 {
#  catchsql {
#    SELECT name FROM main.sqlite_master WHERE type='table';
#  } db2
#} {1 {database schema has changed}}
do_test temptable-4.4.4 {
  catchsql {
    SELECT name FROM main.sqlite_master WHERE type='table';
  } db2
} {0 {t1 t2}}
do_test temptable-4.4.5 {
  catchsql {
................................................................................
  }
} {3 4}
do_test temptable-4.10.1 {
  catchsql {
    SELECT * FROM t2;
  } db2
} {0 {1 2}}
#do_test temptable-4.10.2 {
#  catchsql {
#    SELECT name FROM sqlite_master WHERE type='table'
#  } db2
#} {1 {database schema has changed}}
do_test temptable-4.10.3 {
  catchsql {
    SELECT name FROM sqlite_master WHERE type='table'
  } db2
} {0 {t1 t2}}
do_test temptable-4.11 {
  execsql {
................................................................................
    CREATE TEMP TABLE mask(a,b,c)
  } db2
  execsql {
    CREATE INDEX mask ON t2(x);
    SELECT * FROM t2;
  }
} {3 4}
#do_test temptable-5.2 {
#  catchsql {
#    SELECT * FROM t2;
#  } db2
#} {1 {database schema has changed}}
do_test temptable-5.3 {
  catchsql {
    SELECT * FROM t2;
  } db2
} {0 {3 4}}
do_test temptable-5.4 {
  execsql {

      delete from t1 WHERE a=old.a+2;
    end;
  }
} {1 {cannot create BEFORE trigger on view: v1}}
# Ensure that we cannot create AFTER triggers on views
do_test trigger1-1.14 {
  catchsql {
    create table t1(a,b);
    create view v1 as select * from t1;
    create trigger v1t AFTER update on v1 for each row begin
      delete from t1 WHERE a=old.a+2;
    end;
  }
} {1 {cannot create AFTER trigger on view: v1}}

      delete from t1 WHERE a=old.a+2;
    end;
  }
} {1 {cannot create BEFORE trigger on view: v1}}
# Ensure that we cannot create AFTER triggers on views
do_test trigger1-1.14 {
  catchsql {
    drop view v1;
    create view v1 as select * from t1;
    create trigger v1t AFTER update on v1 for each row begin
      delete from t1 WHERE a=old.a+2;
    end;
  }
} {1 {cannot create AFTER trigger on view: v1}}

#    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 testing the VACUUM statement.
#
# $Id: vacuum.test,v 1.14 2003/12/07 00:24:35 drh Exp $

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

proc cksum {{db db}} {
  set txt [$db eval {SELECT name, type, sql FROM sqlite_master}]\n
  foreach tbl [$db eval {SELECT name FROM sqlite_master WHERE type='table'}] {
................................................................................
    DROP TABLE t4;
    DROP TABLE t5;
  } db2
  set ::cksum [cksum db2]
  catchsql {
    VACUUM
  }
} {1 {database schema has changed}}
do_test vacuum-2.3 {
  execsql {
    VACUUM;
  }
  cksum
} $cksum
do_test vacuum-2.4 {
  catch {db2 eval {SELECT count(*) FROM sqlite_master}}
  cksum db2
} $cksum

#    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 testing the VACUUM statement.
#
# $Id: vacuum.test,v 1.15 2004/02/14 16:31:04 drh Exp $

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

proc cksum {{db db}} {
  set txt [$db eval {SELECT name, type, sql FROM sqlite_master}]\n
  foreach tbl [$db eval {SELECT name FROM sqlite_master WHERE type='table'}] {
................................................................................
    DROP TABLE t4;
    DROP TABLE t5;
  } db2
  set ::cksum [cksum db2]
  catchsql {
    VACUUM
  }
} {0 {}}
do_test vacuum-2.3 {



  cksum
} $cksum
do_test vacuum-2.4 {
  catch {db2 eval {SELECT count(*) FROM sqlite_master}}
  cksum db2
} $cksum