--- a/engine/sqlite/src/vacuum.cpp	Wed May 26 10:44:32 2010 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,263 +0,0 @@
-/*
-** 2003 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.
-**
-*************************************************************************
-** This file contains code used to implement the VACUUM command.
-**
-** Most of the code in this file may be omitted by defining the
-** SQLITE_OMIT_VACUUM macro.
-**
-** $Id: vacuum.cpp 1282 2008-11-13 09:31:33Z LarsPson $
-*/
-#include "sqliteInt.h"
-#include "vdbeInt.h"
-
-#if !defined(SQLITE_OMIT_VACUUM) && !defined(SQLITE_OMIT_ATTACH)
-/*
-** Execute zSql on database db. Return an error code.
-*/
-static int execSql(sqlite3 *db, const char *zSql){
-  sqlite3_stmt *pStmt;
-  if( !zSql ){
-    return SQLITE_NOMEM;
-  }
-  if( SQLITE_OK!=sqlite3_prepare(db, zSql, -1, &pStmt, 0) ){
-    return sqlite3_errcode(db);
-  }
-  while( SQLITE_ROW==sqlite3_step(pStmt) ){}
-  return sqlite3_finalize(pStmt);
-}
-
-/*
-** Execute zSql on database db. The statement returns exactly
-** one column. Execute this as SQL on the same database.
-*/
-static int execExecSql(sqlite3 *db, const char *zSql){
-  sqlite3_stmt *pStmt;
-  int rc;
-
-  rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0);
-  if( rc!=SQLITE_OK ) return rc;
-
-  while( SQLITE_ROW==sqlite3_step(pStmt) ){
-    rc = execSql(db, (char*)sqlite3_column_text(pStmt, 0));
-    if( rc!=SQLITE_OK ){
-      sqlite3_finalize(pStmt);
-      return rc;
-    }
-  }
-
-  return sqlite3_finalize(pStmt);
-}
-
-/*
-** The non-standard VACUUM command is used to clean up the database,
-** collapse free space, etc.  It is modelled after the VACUUM command
-** in PostgreSQL.
-**
-** In version 1.0.x of SQLite, the VACUUM command would call
-** gdbm_reorganize() on all the database tables.  But beginning
-** with 2.0.0, SQLite no longer uses GDBM so this command has
-** become a no-op.
-*/
-void sqlite3Vacuum(Parse *pParse){
-  Vdbe *v = sqlite3GetVdbe(pParse);
-  if( v ){
-    sqlite3VdbeAddOp(v, OP_Vacuum, 0, 0);
-  }
-  return;
-}
-
-/*
-** This routine implements the OP_Vacuum opcode of the VDBE.
-*/
-int sqlite3RunVacuum(char **pzErrMsg, sqlite3 *db){
-  int rc = SQLITE_OK;     /* Return code from service routines */
-  Btree *pMain;           /* The database being vacuumed */
-  Btree *pTemp;           /* The temporary database we vacuum into */
-  char *zSql = 0;         /* SQL statements */
-  int saved_flags;        /* Saved value of the db->flags */
-  Db *pDb = 0;            /* Database to detach at end of vacuum */
-
-  /* Save the current value of the write-schema flag before setting it. */
-  saved_flags = db->flags;
-  db->flags |= SQLITE_WriteSchema | SQLITE_IgnoreChecks;
-
-  if( !db->autoCommit ){
-    sqlite3SetString(pzErrMsg, "cannot VACUUM from within a transaction", 
-       (char*)0);
-    rc = SQLITE_ERROR;
-    goto end_of_vacuum;
-  }
-  pMain = db->aDb[0].pBt;
-
-  /* Attach the temporary database as 'vacuum_db'. The synchronous pragma
-  ** can be set to 'off' for this file, as it is not recovered if a crash
-  ** occurs anyway. The integrity of the database is maintained by a
-  ** (possibly synchronous) transaction opened on the main database before
-  ** sqlite3BtreeCopyFile() is called.
-  **
-  ** An optimisation would be to use a non-journaled pager.
-  */
-  zSql = "ATTACH '' AS vacuum_db;";
-  rc = execSql(db, zSql);
-  if( rc!=SQLITE_OK ) goto end_of_vacuum;
-  pDb = &db->aDb[db->nDb-1];
-  assert( strcmp(db->aDb[db->nDb-1].zName,"vacuum_db")==0 );
-  pTemp = db->aDb[db->nDb-1].pBt;
-  sqlite3BtreeSetPageSize(pTemp, sqlite3BtreeGetPageSize(pMain),
-     sqlite3BtreeGetReserve(pMain));
-  if( db->mallocFailed ){
-    rc = SQLITE_NOMEM;
-    goto end_of_vacuum;
-  }
-  assert( sqlite3BtreeGetPageSize(pTemp)==sqlite3BtreeGetPageSize(pMain) );
-  rc = execSql(db, "PRAGMA vacuum_db.synchronous=OFF");
-  if( rc!=SQLITE_OK ){
-    goto end_of_vacuum;
-  }
-
-#ifndef SQLITE_OMIT_AUTOVACUUM
-  sqlite3BtreeSetAutoVacuum(pTemp, db->nextAutovac>=0 ? db->nextAutovac :
-                                           sqlite3BtreeGetAutoVacuum(pMain));
-#endif
-
-  /* Begin a transaction */
-  rc = execSql(db, "BEGIN EXCLUSIVE;");
-  if( rc!=SQLITE_OK ) goto end_of_vacuum;
-
-  /* Query the schema of the main database. Create a mirror schema
-  ** in the temporary database.
-  */
-  rc = execExecSql(db, 
-      "SELECT 'CREATE TABLE vacuum_db.' || substr(sql,14) "
-      "  FROM sqlite_master WHERE type='table' AND name!='sqlite_sequence'"
-      "   AND rootpage>0"
-  );
-  if( rc!=SQLITE_OK ) goto end_of_vacuum;
-  rc = execExecSql(db, 
-      "SELECT 'CREATE INDEX vacuum_db.' || substr(sql,14)"
-      "  FROM sqlite_master WHERE sql LIKE 'CREATE INDEX %' ");
-  if( rc!=SQLITE_OK ) goto end_of_vacuum;
-  rc = execExecSql(db, 
-      "SELECT 'CREATE UNIQUE INDEX vacuum_db.' || substr(sql,21) "
-      "  FROM sqlite_master WHERE sql LIKE 'CREATE UNIQUE INDEX %'");
-  if( rc!=SQLITE_OK ) goto end_of_vacuum;
-
-  /* Loop through the tables in the main database. For each, do
-  ** an "INSERT INTO vacuum_db.xxx SELECT * FROM xxx;" to copy
-  ** the contents to the temporary database.
-  */
-  rc = execExecSql(db, 
-      "SELECT 'INSERT INTO vacuum_db.' || quote(name) "
-      "|| ' SELECT * FROM ' || quote(name) || ';'"
-      "FROM sqlite_master "
-      "WHERE type = 'table' AND name!='sqlite_sequence' "
-      "  AND rootpage>0"
-
-  );
-  if( rc!=SQLITE_OK ) goto end_of_vacuum;
-
-  /* Copy over the sequence table
-  */
-  rc = execExecSql(db, 
-      "SELECT 'DELETE FROM vacuum_db.' || quote(name) || ';' "
-      "FROM vacuum_db.sqlite_master WHERE name='sqlite_sequence' "
-  );
-  if( rc!=SQLITE_OK ) goto end_of_vacuum;
-  rc = execExecSql(db, 
-      "SELECT 'INSERT INTO vacuum_db.' || quote(name) "
-      "|| ' SELECT * FROM ' || quote(name) || ';' "
-      "FROM vacuum_db.sqlite_master WHERE name=='sqlite_sequence';"
-  );
-  if( rc!=SQLITE_OK ) goto end_of_vacuum;
-
-
-  /* Copy the triggers, views, and virtual tables from the main database
-  ** over to the temporary database.  None of these objects has any
-  ** associated storage, so all we have to do is copy their entries
-  ** from the SQLITE_MASTER table.
-  */
-  rc = execSql(db,
-      "INSERT INTO vacuum_db.sqlite_master "
-      "  SELECT type, name, tbl_name, rootpage, sql"
-      "    FROM sqlite_master"
-      "   WHERE type='view' OR type='trigger'"
-      "      OR (type='table' AND rootpage=0)"
-  );
-  if( rc ) goto end_of_vacuum;
-
-  /* At this point, unless the main db was completely empty, there is now a
-  ** transaction open on the vacuum database, but not on the main database.
-  ** Open a btree level transaction on the main database. This allows a
-  ** call to sqlite3BtreeCopyFile(). The main database btree level
-  ** transaction is then committed, so the SQL level never knows it was
-  ** opened for writing. This way, the SQL transaction used to create the
-  ** temporary database never needs to be committed.
-  */
-  if( rc==SQLITE_OK ){
-    u32 meta;
-    int i;
-
-    /* This array determines which meta meta values are preserved in the
-    ** vacuum.  Even entries are the meta value number and odd entries
-    ** are an increment to apply to the meta value after the vacuum.
-    ** The increment is used to increase the schema cookie so that other
-    ** connections to the same database will know to reread the schema.
-    */
-    static const unsigned char aCopy[] = {
-       1, 1,    /* Add one to the old schema cookie */
-       3, 0,    /* Preserve the default page cache size */
-       5, 0,    /* Preserve the default text encoding */
-       6, 0,    /* Preserve the user version */
-    };
-
-    assert( 1==sqlite3BtreeIsInTrans(pTemp) );
-    assert( 1==sqlite3BtreeIsInTrans(pMain) );
-
-    /* Copy Btree meta values */
-    for(i=0; i<sizeof(aCopy)/sizeof(aCopy[0]); i+=2){
-      rc = sqlite3BtreeGetMeta(pMain, aCopy[i], &meta);
-      if( rc!=SQLITE_OK ) goto end_of_vacuum;
-      rc = sqlite3BtreeUpdateMeta(pTemp, aCopy[i], meta+aCopy[i+1]);
-      if( rc!=SQLITE_OK ) goto end_of_vacuum;
-    }
-
-    rc = sqlite3BtreeCopyFile(pMain, pTemp);
-    if( rc!=SQLITE_OK ) goto end_of_vacuum;
-    rc = sqlite3BtreeCommit(pTemp);
-    if( rc!=SQLITE_OK ) goto end_of_vacuum;
-    rc = sqlite3BtreeCommit(pMain);
-  }
-
-end_of_vacuum:
-  /* Restore the original value of db->flags */
-  db->flags = saved_flags;
-
-  /* Currently there is an SQL level transaction open on the vacuum
-  ** database. No locks are held on any other files (since the main file
-  ** was committed at the btree level). So it safe to end the transaction
-  ** by manually setting the autoCommit flag to true and detaching the
-  ** vacuum database. The vacuum_db journal file is deleted when the pager
-  ** is closed by the DETACH.
-  */
-  db->autoCommit = 1;
-
-  if( pDb ){
-    sqlite3BtreeClose(pDb->pBt);
-    pDb->pBt = 0;
-    pDb->pSchema = 0;
-  }
-
-  sqlite3ResetInternalSchema(db, 0);
-
-  return rc;
-}
-#endif  /* SQLITE_OMIT_VACUUM && SQLITE_OMIT_ATTACH */