SQLite

/*
** 2004 April 6
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** $Id: btree.c,v 1.163 2004/06/09 20:03:09 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
**
**     Donald E. Knuth, THE ART OF COMPUTER PROGRAMMING, Volume 3:
**     "Sorting And Searching", pages 473-480. Addison-Wesley
**     Publishing Company, Reading, Massachusetts.

  }

  if( pBt->pPage1==0 ){
    rc = lockBtree(pBt);
  }

  if( rc==SQLITE_OK && wrflag ){
    rc = sqlite3pager_begin(pBt->pPage1->aData, nMaster);
    if( rc==SQLITE_OK ){
      rc = newDatabase(pBt);
    }
  }

  if( rc==SQLITE_OK ){
    pBt->inTrans = (wrflag?TRANS_WRITE:TRANS_READ);

**
*************************************************************************
** 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 1.210 2004/06/09 20:03:09 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
** A pointer to this structure is used to communicate information

  /* Also add a UTF-8 case-insensitive collation sequence. */
  sqlite3_create_collation(db, "NOCASE", 0, 0, nocaseCollatingFunc);

  /* Open the backend database driver */
  if( zFilename[0]==':' && strcmp(zFilename,":memory:")==0 ){
    db->temp_store = 2;
    db->nMaster = 0;    /* Disable atomic multi-file commit for :memory: */
  }else{
    db->nMaster = -1;   /* Size of master journal filename initially unknown */
  }
  rc = sqlite3BtreeFactory(db, zFilename, 0, MAX_PAGES, &db->aDb[0].pBt);
  if( rc!=SQLITE_OK ){
    /* FIX ME: sqlite3BtreeFactory() should call sqlite3Error(). */
    sqlite3Error(db, rc, 0);
    db->magic = SQLITE_MAGIC_CLOSED;
    goto opendb_out;

){
  int rc;
  char *zName8 = sqlite3utf16to8(zName, -1, SQLITE_BIGENDIAN);
  rc = sqlite3_create_collation(db, zName8, pref16, pCtx, xCompare);
  sqliteFree(zName8);
  return rc;
}

** 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 1.117 2004/06/09 20:03:09 drh Exp $
*/
#include "os.h"         /* Must be first to enable large file support */
#include "sqliteInt.h"
#include "pager.h"
#include <assert.h>
#include <string.h>

  if( rc==SQLITE_OK ){
    rc = write32bits(&pPager->jfd, pPager->dbSize);
  }
  if( rc==SQLITE_OK ){
    rc = write32bits(&pPager->jfd, pPager->nMaster);
  }
  if( rc==SQLITE_OK ){
    sqlite3OsSeek(&pPager->jfd, 24 + pPager->nMaster - 1);
    rc = sqlite3OsWrite(&pPager->jfd, "\000", 1);
  }
  if( pPager->stmtAutoopen && rc==SQLITE_OK ){
    rc = sqlite3pager_stmt_begin(pPager);
  }
  if( rc!=SQLITE_OK ){
    rc = pager_unwritelock(pPager);
    if( rc==SQLITE_OK ){

/*
** 2001 September 15
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.276 2004/06/09 20:03:09 drh Exp $
*/
#include "config.h"
#include "sqlite3.h"
#include "hash.h"
#include "parse.h"
#include <stdio.h>
#include <stdlib.h>

#endif

  int errCode;                  /* Most recent error code (SQLITE_*) */
  char *zErrMsg;                /* Most recent error message (UTF-8 encoded) */
  void *zErrMsg16;              /* Most recent error message (UTF-16 encoded) */
  u8 enc;                       /* Text encoding for this database. */
  u8 autoCommit;                /* The auto-commit flag. */
  int nMaster;                  /* Length of master journal name. -1=unknown */
};

/*
** Possible values for the sqlite.flags and or Db.flags fields.
**
** On sqlite.flags, the SQLITE_InTrans value means that we have
** executed a BEGIN.  On Db.flags, SQLITE_InTrans means a statement

**
** 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 1.362 2004/06/09 20:03:10 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include "vdbeInt.h"

/*

  int i = pOp->p1;
  Btree *pBt;

  assert( i>=0 && i<db->nDb );
  pBt = db->aDb[i].pBt;

  if( pBt ){
    if( db->nMaster<0 ){
      db->nMaster = strlen(sqlite3BtreeGetFilename(db->aDb[0].pBt))+20;
    }
    rc = sqlite3BtreeBeginTrans(pBt, pOp->p2, db->nMaster);
    if( rc==SQLITE_BUSY ){
        if( db->busyHandler.xFunc==0 ){
          p->pc = pc;
          p->rc = SQLITE_BUSY;
          p->pTos = pTos;
          return SQLITE_BUSY;
        }else{

      return SQLITE_CONSTRAINT;
    }
  }

  /* The simple case - no more than one database file (not counting the TEMP
  ** database) has a transaction active.   There is no need for the
  ** master-journal.
  **
  ** if db->nMaster==0, it means the main database is :memory:.  In that case
  ** we do not support atomic multi-file commits, so use the simple case then
  ** too.
  */
  if( db->nMaster<=0 || nTrans<=1 ){
    for(i=0; rc==SQLITE_OK && i<db->nDb; i++){ 
      Btree *pBt = db->aDb[i].pBt;
      if( pBt ){
        rc = sqlite3BtreeSync(pBt, 0);
      }
    }

      zMaster = sqlite3MPrintf("%s-mj%08X", zMainFile, random);
      if( !zMaster ){
        return SQLITE_NOMEM;
      }
    }while( sqlite3OsFileExists(zMaster) );

    /* Open the master journal. */
    assert( strlen(zMaster)<db->nMaster );
    rc = sqlite3OsOpenExclusive(zMaster, &master, 0);
    if( rc!=SQLITE_OK ){
      sqliteFree(zMaster);
      return rc;
    }
 
    /* Write the name of each database file in the transaction into the new
    ** master journal file. If an error occurs at this point close
    ** and delete the master journal file. All the individual journal files
    ** still have 'null' as the master journal pointer, so they will roll
    ** back independantly if a failure occurs.
    */
    for(i=0; i<db->nDb; i++){ 
      Btree *pBt = db->aDb[i].pBt;
      if( i==1 ) continue;   /* Ignore the TEMP database */
      if( pBt && sqlite3BtreeIsInTrans(pBt) ){
        char const *zFile = sqlite3BtreeGetFilename(pBt);
        if( zFile[0]==0 ) continue;  /* Ignore :memory: databases */






        rc = sqlite3OsWrite(&master, zFile, strlen(zFile)+1);
        if( rc!=SQLITE_OK ){
          sqlite3OsClose(&master);
          sqlite3OsDelete(zMaster);
          sqliteFree(zMaster);
          return rc;
        }
      }
    }

    /* Sync the master journal file */
    rc = sqlite3OsSync(&master);
    sqlite3OsClose(&master);

    /* FIXME:  Sync the directory that contains the master journal to
    ** make sure the i-node is up to date. */

    /* Sync all the db files involved in the transaction. The same call
    ** sets the master journal pointer in each individual journal. If
    ** an error occurs here, do not delete the master journal file.
    **
    ** If the error occurs during the first call to sqlite3BtreeSync(),
    ** then there is a chance that the master journal file will be

# 2001 September 15
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this script is page cache subsystem.
#
# $Id: pager2.test,v 1.2 2004/06/09 20:03:10 drh Exp $


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

if {[info commands pager_open]!=""} {
db close

  set v [catch {
    page_write $::g1 "Page-One"
  } msg]
  lappend v $msg
} {0 {}}
do_test pager2-2.15 {
  pager_stats $::p1
} {ref 1 page 1 max 10 size 1 state 3 err 0 hit 1 miss 1 ovfl 0}
do_test pager2-2.16 {
  page_read $::g1
} {Page-One}
do_test pager2-2.17 {
  set v [catch {
    pager_commit $::p1
  } msg]

      }
    }
    set res
  } {}
  do_test pager2-4.5.$i.1 {
    page_write $g1 "Page-1 v$i"
    lrange [pager_stats $p1] 8 9
  } {state 3}
  do_test pager2-4.5.$i.2 {
    for {set j 2} {$j<=20} {incr j} {
      set gx [page_get $p1 $j]
      page_write $gx "Page-$j v$i"
      page_unref $gx
      if {$j==$i} {
        pager_stmt_begin $p1

      }
    }
    set res
  } {}
  do_test pager2-4.5.$i.5 {
    page_write $g1 "Page-1 v$i"
    lrange [pager_stats $p1] 8 9
  } {state 3}
  do_test pager2-4.5.$i.6 {
    for {set j 2} {$j<=20} {incr j} {
      set gx [page_get $p1 $j]
      page_write $gx "Page-$j v$i"
      page_unref $gx
      if {$j==$i} {
        pager_stmt_begin $p1