class DatastaxRails::Cql::Update

CQL generation for UPDATE

Public Class Methods

new(klass, key) click to toggle source
Calls superclass method DatastaxRails::Cql::Transactions::new
# File lib/datastax_rails/cql/update.rb, line 5
def initialize(klass, key)
  @klass = klass
  @key = key
  @columns = {}
  super
end

Public Instance Methods

columns(columns) click to toggle source
# File lib/datastax_rails/cql/update.rb, line 12
def columns(columns)
  @columns.merge!(columns)
  self
end
limit(limit) click to toggle source
# File lib/datastax_rails/cql/update.rb, line 17
def limit(limit)
  @limit = limit
  self
end
timestamp(timestamp) click to toggle source
# File lib/datastax_rails/cql/update.rb, line 27
def timestamp(timestamp)
  @timestamp = timestamp
  self
end
to_cql() click to toggle source
# File lib/datastax_rails/cql/update.rb, line 32
def to_cql
  stmt = "update #{@klass.column_family} "
  if @ttl || @timestamp
    stmt << 'USING '
    stmt << "TTL #{@ttl} " if @ttl
    stmt << 'AND ' if @ttl && @timestamp
    stmt << "TIMESTAMP #{@timestamp} " if @timestamp
  end

  unless @columns.empty?
    stmt << 'SET '
    updates = []
    @columns.each do |k, v|
      @values << v
      updates << "\"#{k}\" = ?"
    end

    stmt << updates.join(', ')
  end
  conditions = []
  @key.each do |k, v|
    conditions << "\"#{k}\" = ?"
    @values << v
  end
  stmt << " WHERE #{conditions.join(' AND ')}"
end
ttl(ttl) click to toggle source
# File lib/datastax_rails/cql/update.rb, line 22
def ttl(ttl)
  @ttl = ttl
  self
end