Module: SQLiteMagic

Defined in:
lib/scraperwiki/sqlite_save_info.rb

Defined Under Namespace

Classes: SqliteSaveInfo

Class Method Summary collapse

Class Method Details

._do_save_sqlite(unique_keys, data, swdatatblname) ⇒ Object 



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# File 'lib/scraperwiki/sqlite_save_info.rb', line 23

def SQLiteMagic._do_save_sqlite(unique_keys, data, swdatatblname)
  SQLiteMagic._open_db_if_necessary

  res = { }
  if data.class == Hash
    data = [data]
  end

  if !@sqlitesaveinfo.include?(swdatatblname)
    ssinfo = SqliteSaveInfo.new(swdatatblname, @db)
    @sqlitesaveinfo[swdatatblname] = ssinfo
    if not ssinfo.rebuildinfo() and data.length > 0
      ssinfo.buildinitialtable(data[0])
      ssinfo.rebuildinfo()
      res["tablecreated"] = swdatatblname
    end
  else
    ssinfo = @sqlitesaveinfo[swdatatblname]
  end

  @db.transaction()

  nrecords = 0
  data.each do |ldata|
    newcols = ssinfo.newcolumns(ldata)
    if newcols.length > 0
      newcols.each_with_index do |kv, i|
        ssinfo.addnewcolumn(kv[0], kv[1])
        res["newcolumn %d" % i] = "%s %s" % kv
      end
      ssinfo.rebuildinfo()
    end

    if nrecords == 0 && unique_keys.length > 0
      idxname, idxkeys = ssinfo.findclosestindex(unique_keys)
      # puts "findclosestindex returned name:"+ idxname.to_s + " keys:" + idxkeys.to_s
      if !idxname || idxkeys != unique_keys.to_set
        lres = ssinfo.makenewindex(idxname, unique_keys)
        if lres.include?('error')
          return lres
        end
        res.merge!(lres)
      end
    end

    lres = ssinfo.insertdata(ldata)
    nrecords += 1
  end

  @db.commit()
  # log(nrecords + " inserted or replaced")
  return res
end

._open_db_if_necessary ⇒ Object 



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# File 'lib/scraperwiki/sqlite_save_info.rb', line 17

def SQLiteMagic._open_db_if_necessary()
  if @db.nil?
    @db = SQLite3::Database.new("scraperwiki.sqlite")
  end
end

.close ⇒ Object 



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# File 'lib/scraperwiki/sqlite_save_info.rb', line 83

def SQLiteMagic.close()
  @db.close
  @db = nil
  @sqlitesaveinfo = {}
end

.sqliteexecute(query, data = nil, verbose = 2) ⇒ Object 



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# File 'lib/scraperwiki/sqlite_save_info.rb', line 77

def SQLiteMagic.sqliteexecute(query,data=nil, verbose=2)
  SQLiteMagic._open_db_if_necessary
  cols,*rows = (data.nil?)? @db.execute2(query) : @db.execute2(query,data)
  return {"keys"=>cols, "data"=>rows} unless cols.nil? or rows.nil?
end