Method: SQLite3::ResultSet#next

Defined in:
lib/sqlite3/resultset.rb

#next ⇒ Object

Obtain the next row from the cursor. If there are no more rows to be had, this will return nil. If type translation is active on the corresponding database, the values in the row will be translated according to their types.

The returned value will be an array, unless Database#results_as_hash has been set to true, in which case the returned value will be a hash.

For arrays, the column names are accessible via the fields property, and the column types are accessible via the types property.

For hashes, the column names are the keys of the hash, and the column types are accessible via the types property.



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# File 'lib/sqlite3/resultset.rb', line 89

def next
  return nil if @eof

  @stmt.must_be_open!

  unless @first_row
    result = @driver.step( @stmt.handle )
    check result
  end

  @first_row = false

  unless @eof
    row = []
    @driver.data_count( @stmt.handle ).times do |column|
      type  = @driver.column_type( @stmt.handle, column )

      if type == Constants::ColumnType::TEXT
        row << @driver.column_text( @stmt.handle, column )
      elsif type == Constants::ColumnType::NULL
        row << nil
      elsif type == Constants::ColumnType::BLOB
        row << @driver.column_blob( @stmt.handle, column )
      else
        row << @driver.column_text( @stmt.handle, column )
      end
    end

    if @db.type_translation
      row = @stmt.types.zip( row ).map do |type, value|
        @db.translator.translate( type, value )
      end
    end

    if @db.results_as_hash
      new_row = HashWithTypes[ *( @stmt.columns.zip( row ).to_a.flatten ) ]
      row.each_with_index { |value,idx| new_row[idx] = value }
      row = new_row
    else
      if row.respond_to?(:fields)
        row = ArrayWithTypes.new(row)
      else
        row = ArrayWithTypesAndFields.new(row)
      end
      row.fields = @stmt.columns
    end

    row.types = @stmt.types

    return row
  end

  nil
end