class DatastaxRails::Cql::AlterColumnFamily
CQL generation for ALTER COLUMNFAMILY
Public Class Methods
new(cf_name)
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# File lib/datastax_rails/cql/alter_column_family.rb, line 5 def initialize(cf_name) @cf_name = cf_name @action = nil end
Public Instance Methods
add(column)
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# File lib/datastax_rails/cql/alter_column_family.rb, line 10 def add(column) set_column(column) @action = 'ADD' self end
alter(column)
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# File lib/datastax_rails/cql/alter_column_family.rb, line 22 def alter(column) set_column(column) @action = 'ALTER' self end
drop(column)
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# File lib/datastax_rails/cql/alter_column_family.rb, line 16 def drop(column) set_column(column) @action = 'DROP' self end
rename(col1, col2)
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# File lib/datastax_rails/cql/alter_column_family.rb, line 28 def rename(col1, col2) set_column([col1, col2]) @action = 'RENAME' self end
set_column(column)
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# File lib/datastax_rails/cql/alter_column_family.rb, line 34 def set_column(column) # rubocop:disable Style/AccessorMethodName fail ArgumentError, 'Only one operation allowed per CQL call' if @action @column = column end
to_cql()
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# File lib/datastax_rails/cql/alter_column_family.rb, line 39 def to_cql stmt = "ALTER COLUMNFAMILY #{@cf_name} " if (@action == 'ALTER') stmt << "ALTER #{@column.keys.first} TYPE #{@column.values.first}" elsif (@action == 'ADD') stmt << "ADD #{@column.keys.first} #{@column.values.first}" elsif (@action == 'DROP') stmt << "DROP #{@column}" elsif (@action == 'RENAME') stmt << "RENAME \"#{@column[0]}\" TO \"#{@column[1]}\"" end stmt end