view release on metacpan or  search on metacpan

main.c  view on Meta::CPAN

  char const *zMasterName;
  char *zSql = 0;

  /*
  ** The master database table has a structure like this
  */
  static char master_schema[] = 
     "CREATE TABLE sqlite_master(\n"
     "  type text,\n"
     "  name text,\n"
     "  tbl_name text,\n"
     "  rootpage integer,\n"
     "  sql text\n"
     ")"
  ;
  static char temp_master_schema[] = 
     "CREATE TEMP TABLE sqlite_temp_master(\n"
     "  type text,\n"
     "  name text,\n"
     "  tbl_name text,\n"
     "  rootpage integer,\n"
     "  sql text\n"
     ")"
  ;

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

  /* zMasterSchema and zInitScript are set to point at the master schema
  ** and initialisation script appropriate for the database being
  ** initialised. zMasterName is the name of the master table.
  */
  if( iDb==1 ){
    zMasterSchema = temp_master_schema;
    zMasterName = TEMP_MASTER_NAME;
  }else{
    zMasterSchema = master_schema;
    zMasterName = MASTER_NAME;
  }

  /* Construct the schema table.
  */
  sqliteSafetyOff(db);
  azArg[0] = "table";
  azArg[1] = zMasterName;
  azArg[2] = "2";
  azArg[3] = zMasterSchema;
  sprintf(zDbNum, "%d", iDb);
  azArg[4] = zDbNum;
  azArg[5] = 0;
  initData.db = db;
  initData.pzErrMsg = pzErrMsg;
  sqliteInitCallback(&initData, 5, (char **)azArg, 0);
  pTab = sqliteFindTable(db, zMasterName, db->aDb[iDb].zName);
  if( pTab ){
    pTab->readOnly = 1;
  }else{
    return SQLITE_NOMEM;
  }
  sqliteSafetyOn(db);

  /* 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), (char*)0);
    return rc;
  }

  /* Get the database meta information
  */
  rc = sqliteBtreeGetMeta(db->aDb[iDb].pBt, meta);
  if( rc ){
    sqliteSetString(pzErrMsg, sqlite_error_string(rc), (char*)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( meta[6]>0 && meta[6]<=2 && db->temp_store==0 ){
      db->temp_store = meta[6];
    }
    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", (char*)0);
      return SQLITE_ERROR;
    }
  }else if( iDb!=1 && (db->file_format!=meta[2] || db->file_format<4) ){
    assert( db->file_format>=4 );
    if( meta[2]==0 ){
      sqliteSetString(pzErrMsg, "cannot attach empty database: ",
         db->aDb[iDb].zName, (char*)0);
    }else{
      sqliteSetString(pzErrMsg, "incompatible file format in auxiliary "
         "database: ", db->aDb[iDb].zName, (char*)0);
    }
    sqliteBtreeClose(db->aDb[iDb].pBt);
    db->aDb[iDb].pBt = 0;
    return SQLITE_FORMAT;
  }
  sqliteBtreeSetCacheSize(db->aDb[iDb].pBt, db->cache_size);
  sqliteBtreeSetSafetyLevel(db->aDb[iDb].pBt, meta[4]==0 ? 2 : meta[4]);