Class: Cequel::Schema::Keyspace Deprecated
- Inherits:
-
Object
- Object
- Cequel::Schema::Keyspace
- Defined in:
- lib/cequel/schema/keyspace.rb
Overview
These methods will be exposed directly on Metal::Keyspace in a future version of Cequel
Provides read/write access to the schema for a keyspace and the tables it contains
Instance Method Summary collapse
-
#alter_table(name) { ... } ⇒ void
Make changes to an existing table in the keyspace.
-
#create!(options = {}) ⇒ void
Create this keyspace in the database.
-
#create_table(name) { ... } ⇒ void
Create a table in the keyspace.
-
#drop! ⇒ void
Drop this keyspace from the database.
-
#drop_table(name) ⇒ void
Drop this table from the keyspace.
-
#initialize(keyspace) ⇒ Keyspace
constructor
private
A new instance of Keyspace.
-
#read_table(name) ⇒ Table
Object representation of the table schema as it currently exists in the database.
-
#sync_table(name) { ... } ⇒ void
(also: #synchronize_table)
Create or update a table to match a given schema structure.
-
#truncate_table(name) ⇒ void
Remove all data from this table.
Constructor Details
#initialize(keyspace) ⇒ Keyspace
This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.
Returns a new instance of Keyspace.
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# File 'lib/cequel/schema/keyspace.rb', line 17 def initialize(keyspace) @keyspace = keyspace end |
Instance Method Details
#alter_table(name) { ... } ⇒ void
This method returns an undefined value.
Make changes to an existing table in the keyspace
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# File 'lib/cequel/schema/keyspace.rb', line 118 def alter_table(name, &block) updater = TableUpdater.apply(keyspace, name) do |updater| UpdateTableDSL.apply(updater, &block) end end |
#create!(options = {}) ⇒ void
This method returns an undefined value.
Create this keyspace in the database
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# File 'lib/cequel/schema/keyspace.rb', line 35 def create!( = {}) = Metal::Keyspace.new(keyspace.configuration.except(:keyspace)) = .symbolize_keys [:class] ||= 'SimpleStrategy' if [:class] == 'SimpleStrategy' [:replication_factor] ||= 1 end = .map do |name, value| "'#{name}': #{CassandraCQL::Statement.quote(value)}" end .execute(<<-CQL) CREATE KEYSPACE #{keyspace.name} WITH REPLICATION = {#{.join(', ')}} CQL end |
#create_table(name) { ... } ⇒ void
This method returns an undefined value.
Create a table in the keyspace
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# File 'lib/cequel/schema/keyspace.rb', line 96 def create_table(name, &block) table = Table.new(name) CreateTableDSL.apply(table, &block) TableWriter.apply(keyspace, table) end |
#drop! ⇒ void
This method returns an undefined value.
Drop this keyspace from the database
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# File 'lib/cequel/schema/keyspace.rb', line 62 def drop! keyspace.execute("DROP KEYSPACE #{keyspace.name}") end |
#drop_table(name) ⇒ void
This method returns an undefined value.
Drop this table from the keyspace
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# File 'lib/cequel/schema/keyspace.rb', line 143 def drop_table(name) keyspace.execute("DROP TABLE #{name}") end |
#read_table(name) ⇒ Table
Returns object representation of the table schema as it currently exists in the database.
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# File 'lib/cequel/schema/keyspace.rb', line 71 def read_table(name) TableReader.read(keyspace, name) end |
#sync_table(name) { ... } ⇒ void Also known as: synchronize_table
This method returns an undefined value.
Create or update a table to match a given schema structure. The desired schema structure is defined by the directives given in the block; this is then compared to the existing table in the database (if it is defined at all), and then the table is created or altered accordingly.
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# File 'lib/cequel/schema/keyspace.rb', line 160 def sync_table(name, &block) existing = read_table(name) updated = Table.new(name) CreateTableDSL.apply(updated, &block) TableSynchronizer.apply(keyspace, existing, updated) end |
#truncate_table(name) ⇒ void
This method returns an undefined value.
Remove all data from this table. Truncating a table can be much slower than simply iterating over its keys and issuing ‘DELETE` statements, particularly if the table does not have many rows. Truncating is equivalent to dropping a table and then recreating it
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# File 'lib/cequel/schema/keyspace.rb', line 133 def truncate_table(name) keyspace.execute("TRUNCATE #{name}") end |