Module: ActiveRecord::ConnectionAdapters::Redshift::SchemaStatements
- Included in:
- ActiveRecord::ConnectionAdapters::RedshiftAdapter
- Defined in:
- lib/active_record/connection_adapters/redshift/schema_statements.rb
Instance Method Summary collapse
-
#add_column(table_name, column_name, type, **options) ⇒ Object
:nodoc:.
-
#add_index(table_name, column_name, **options) ⇒ Object
:nodoc:.
-
#change_column(table_name, column_name, type, **options) ⇒ Object
Changes the column of a table.
-
#change_column_default(table_name, column_name, default_or_changes) ⇒ Object
Changes the default value of a table column.
- #change_column_null(table_name, column_name, null, default = nil) ⇒ Object
- #collation ⇒ Object
-
#columns(table_name) ⇒ Object
Returns the list of all column definitions for a table.
-
#columns_for_distinct(columns, orders) ⇒ Object
PostgreSQL requires the ORDER BY columns in the select list for distinct queries, and requires that the ORDER BY include the distinct column.
-
#create_database(name, **options) ⇒ Object
Create a new Redshift database.
-
#create_schema(schema_name) ⇒ Object
Creates a schema for the given schema name.
- #ctype ⇒ Object
-
#current_database ⇒ Object
Returns the current database name.
-
#current_schema ⇒ Object
Returns the current schema name.
- #data_source_exists?(name) ⇒ Boolean
-
#data_sources ⇒ Object
:nodoc.
-
#default_sequence_name(table_name, pk = nil) ⇒ Object
Returns the sequence name for a table's primary key or some other specified key.
-
#drop_database(name) ⇒ Object
Drops a Redshift database.
-
#drop_schema(schema_name, **options) ⇒ Object
Drops the schema for the given schema name.
- #drop_table(table_name, **options) ⇒ Object
-
#encoding ⇒ Object
Returns the current database encoding format.
-
#extract_foreign_key_action(specifier) ⇒ Object
:nodoc:.
- #fetch_type_metadata(column_name, sql_type, oid, fmod) ⇒ Object
- #foreign_keys(table_name) ⇒ Object
- #index_name_exists?(table_name, index_name, default) ⇒ Boolean
- #index_name_length ⇒ Object
-
#indexes(table_name, name = nil) ⇒ Object
Returns an array of indexes for the given table.
-
#new_column(name, default, sql_type_metadata = nil, null = true, table_name = nil, default_function = nil) ⇒ Object
:nodoc:.
-
#pk_and_sequence_for(table) ⇒ Object
:nodoc:.
-
#primary_keys(table) ⇒ Object
Returns just a table's primary key.
-
#recreate_database(name, **options) ⇒ Object
Drops the database specified on the
name
attribute and creates it again using the providedoptions
. -
#remove_index!(table_name, index_name) ⇒ Object
:nodoc:.
-
#rename_column(table_name, column_name, new_column_name) ⇒ Object
Renames a column in a table.
- #rename_index(table_name, old_name, new_name) ⇒ Object
-
#rename_table(table_name, new_name) ⇒ Object
Renames a table.
-
#reset_pk_sequence!(table, pk = nil, sequence = nil) ⇒ Object
:nodoc:.
-
#schema_exists?(name) ⇒ Boolean
Returns true if schema exists.
-
#schema_names ⇒ Object
Returns an array of schema names.
-
#schema_search_path ⇒ Object
Returns the active schema search path.
-
#schema_search_path=(schema_csv) ⇒ Object
Sets the schema search path to a string of comma-separated schema names.
- #serial_sequence(table, column) ⇒ Object
-
#set_pk_sequence!(table, value) ⇒ Object
:nodoc:.
-
#table_exists?(name) ⇒ Boolean
Returns true if table exists.
-
#tables(name = nil) ⇒ Object
Returns the list of all tables in the schema search path or a specified schema.
-
#type_to_sql(type, limit: nil, precision: nil, scale: nil) ⇒ Object
Maps logical Rails types to PostgreSQL-specific data types.
-
#view_exists?(view_name) ⇒ Boolean
:nodoc:.
-
#views ⇒ Object
:nodoc:.
Instance Method Details
#add_column(table_name, column_name, type, **options) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 292 def add_column(table_name, column_name, type, **) #:nodoc: clear_cache! super end |
#add_index(table_name, column_name, **options) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 345 def add_index(table_name, column_name, **) #:nodoc: end |
#change_column(table_name, column_name, type, **options) ⇒ Object
Changes the column of a table.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 298 def change_column(table_name, column_name, type, **) clear_cache! quoted_table_name = quote_table_name(table_name) sql_type = type_to_sql(type, limit: [:limit], precision: [:precision], scale: [:scale]) sql = "ALTER TABLE #{quoted_table_name} ALTER COLUMN #{quote_column_name(column_name)} TYPE #{sql_type}" sql << " USING #{[:using]}" if [:using] if [:cast_as] sql << " USING CAST(#{quote_column_name(column_name)} AS #{type_to_sql([:cast_as], limit: [:limit], precision: [:precision], scale: [:scale])})" end execute sql change_column_default(table_name, column_name, [:default]) if () change_column_null(table_name, column_name, [:null], [:default]) if .key?(:null) end |
#change_column_default(table_name, column_name, default_or_changes) ⇒ Object
Changes the default value of a table column.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 314 def change_column_default(table_name, column_name, default_or_changes) clear_cache! column = column_for(table_name, column_name) return unless column default = extract_new_default_value(default_or_changes) alter_column_query = "ALTER TABLE #{quote_table_name(table_name)} ALTER COLUMN #{quote_column_name(column_name)} %s" if default.nil? # <tt>DEFAULT NULL</tt> results in the same behavior as <tt>DROP DEFAULT</tt>. However, PostgreSQL will # cast the default to the columns type, which leaves us with a default like "default NULL::character varying". execute alter_column_query % "DROP DEFAULT" else execute alter_column_query % "SET DEFAULT #{quote_default_value(default, column)}" end end |
#change_column_null(table_name, column_name, null, default = nil) ⇒ Object
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 330 def change_column_null(table_name, column_name, null, default = nil) clear_cache! unless null || default.nil? column = column_for(table_name, column_name) execute("UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote_default_value(default, column)} WHERE #{quote_column_name(column_name)} IS NULL") if column end execute("ALTER TABLE #{quote_table_name(table_name)} ALTER #{quote_column_name(column_name)} #{null ? 'DROP' : 'SET'} NOT NULL") end |
#collation ⇒ Object
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 201 def collation end |
#columns(table_name) ⇒ Object
Returns the list of all column definitions for a table.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 173 def columns(table_name) column_definitions(table_name.to_s).map do |column_name, type, default, notnull, oid, fmod| default_value = extract_value_from_default(default) = (column_name, type, oid, fmod) default_function = extract_default_function(default_value, default) new_column(column_name, default_value, , notnull == 'f', table_name, default_function) end end |
#columns_for_distinct(columns, orders) ⇒ Object
PostgreSQL requires the ORDER BY columns in the select list for distinct queries, and requires that the ORDER BY include the distinct column.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 414 def columns_for_distinct(columns, orders) #:nodoc: order_columns = orders.reject(&:blank?).map{ |s| # Convert Arel node to string s = s.to_sql unless s.is_a?(String) # Remove any ASC/DESC modifiers s.gsub(/\s+(?:ASC|DESC)\b/i, '') .gsub(/\s+NULLS\s+(?:FIRST|LAST)\b/i, '') }.reject(&:blank?).map.with_index { |column, i| "#{column} AS alias_#{i}" } [super, *order_columns].join(', ') end |
#create_database(name, **options) ⇒ Object
Create a new Redshift database. Options include :owner
, :template
, :encoding
(defaults to utf8), :collation
, :ctype
, :tablespace
, and :connection_limit
(note that MySQL uses :charset
while Redshift uses :encoding
).
Example:
create_database config[:database], config
create_database 'foo_development', encoding: 'unicode'
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 59 def create_database(name, **) = { encoding: 'utf8' }.merge!(.symbolize_keys) option_string = .inject("") do |memo, (key, value)| memo += case key when :owner " OWNER = \"#{value}\"" else "" end end execute "CREATE DATABASE #{quote_table_name(name)}#{option_string}" end |
#create_schema(schema_name) ⇒ Object
Creates a schema for the given schema name.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 219 def create_schema schema_name execute "CREATE SCHEMA #{quote_schema_name(schema_name)}" end |
#ctype ⇒ Object
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 204 def ctype end |
#current_database ⇒ Object
Returns the current database name.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 187 def current_database select_value('select current_database()', 'SCHEMA') end |
#current_schema ⇒ Object
Returns the current schema name.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 192 def current_schema select_value('SELECT current_schema', 'SCHEMA') end |
#data_source_exists?(name) ⇒ Boolean
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 116 def data_source_exists?(name) name = Utils.extract_schema_qualified_name(name.to_s) return false unless name.identifier select_value(<<-SQL, 'SCHEMA').to_i > 0 SELECT COUNT(*) FROM pg_class c LEFT JOIN pg_namespace n ON n.oid = c.relnamespace WHERE c.relkind IN ('r','v','m') -- (r)elation/table, (v)iew, (m)aterialized view AND c.relname = '#{name.identifier}' AND n.nspname = #{name.schema ? "'#{name.schema}'" : 'ANY (current_schemas(false))'} SQL end |
#data_sources ⇒ Object
:nodoc
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 93 def data_sources # :nodoc select_values(<<-SQL, 'SCHEMA') SELECT c.relname FROM pg_class c LEFT JOIN pg_namespace n ON n.oid = c.relnamespace WHERE c.relkind IN ('r', 'v','m') -- (r)elation/table, (v)iew, (m)aterialized view AND n.nspname = ANY (current_schemas(false)) SQL end |
#default_sequence_name(table_name, pk = nil) ⇒ Object
Returns the sequence name for a table's primary key or some other specified key.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 246 def default_sequence_name(table_name, pk = nil) #:nodoc: result = serial_sequence(table_name, pk || 'id') return nil unless result Utils.extract_schema_qualified_name(result).to_s rescue ActiveRecord::StatementInvalid Redshift::Name.new(nil, "#{table_name}_#{pk || 'id'}_seq").to_s end |
#drop_database(name) ⇒ Object
Drops a Redshift database.
Example:
drop_database 'matt_development'
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 78 def drop_database(name) #:nodoc: execute "DROP DATABASE #{quote_table_name(name)}" end |
#drop_schema(schema_name, **options) ⇒ Object
Drops the schema for the given schema name.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 224 def drop_schema(schema_name, **) execute "DROP SCHEMA#{' IF EXISTS' if [:if_exists]} #{quote_schema_name(schema_name)} CASCADE" end |
#drop_table(table_name, **options) ⇒ Object
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 154 def drop_table(table_name, **) execute "DROP TABLE #{quote_table_name(table_name)}#{' CASCADE' if [:force] == :cascade}" end |
#encoding ⇒ Object
Returns the current database encoding format.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 197 def encoding select_value("SELECT pg_encoding_to_char(encoding) FROM pg_database WHERE datname LIKE '#{current_database}'", 'SCHEMA') end |
#extract_foreign_key_action(specifier) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 383 def extract_foreign_key_action(specifier) # :nodoc: case specifier when 'c'; :cascade when 'n'; :nullify when 'r'; :restrict end end |
#fetch_type_metadata(column_name, sql_type, oid, fmod) ⇒ Object
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 426 def (column_name, sql_type, oid, fmod) cast_type = get_oid_type(oid.to_i, fmod.to_i, column_name, sql_type) simple_type = SqlTypeMetadata.new( sql_type: sql_type, type: cast_type.type, limit: cast_type.limit, precision: cast_type.precision, scale: cast_type.scale, ) TypeMetadata.new(simple_type, oid: oid, fmod: fmod) end |
#foreign_keys(table_name) ⇒ Object
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 354 def foreign_keys(table_name) fk_info = select_all(<<-SQL.strip_heredoc, 'SCHEMA') SELECT t2.relname AS to_table, a1.attname AS column, a2.attname AS primary_key, c.conname AS name, c.confupdtype AS on_update, c.confdeltype AS on_delete FROM pg_constraint c JOIN pg_class t1 ON c.conrelid = t1.oid JOIN pg_class t2 ON c.confrelid = t2.oid JOIN pg_attribute a1 ON a1.attnum = c.conkey[1] AND a1.attrelid = t1.oid JOIN pg_attribute a2 ON a2.attnum = c.confkey[1] AND a2.attrelid = t2.oid JOIN pg_namespace t3 ON c.connamespace = t3.oid WHERE c.contype = 'f' AND t1.relname = #{quote(table_name)} AND t3.nspname = ANY (current_schemas(false)) ORDER BY c.conname SQL fk_info.map do |row| = { column: row['column'], name: row['name'], primary_key: row['primary_key'] } [:on_delete] = extract_foreign_key_action(row['on_delete']) [:on_update] = extract_foreign_key_action(row['on_update']) ForeignKeyDefinition.new(table_name, row['to_table'], ) end end |
#index_name_exists?(table_name, index_name, default) ⇒ Boolean
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 163 def index_name_exists?(table_name, index_name, default) false end |
#index_name_length ⇒ Object
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 391 def index_name_length 63 end |
#indexes(table_name, name = nil) ⇒ Object
Returns an array of indexes for the given table.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 168 def indexes(table_name, name = nil) [] end |
#new_column(name, default, sql_type_metadata = nil, null = true, table_name = nil, default_function = nil) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 182 def new_column(name, default, = nil, null = true, table_name = nil, default_function = nil) # :nodoc: RedshiftColumn.new(name, default, , null, default_function) end |
#pk_and_sequence_for(table) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 264 def pk_and_sequence_for(table) #:nodoc: [nil, nil] end |
#primary_keys(table) ⇒ Object
Returns just a table's primary key
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 269 def primary_keys(table) pks = query(<<-end_sql, 'SCHEMA') SELECT DISTINCT attr.attname FROM pg_attribute attr INNER JOIN pg_depend dep ON attr.attrelid = dep.refobjid AND attr.attnum = dep.refobjsubid INNER JOIN pg_constraint cons ON attr.attrelid = cons.conrelid AND attr.attnum = any(cons.conkey) WHERE cons.contype = 'p' AND dep.refobjid = '#{quote_table_name(table)}'::regclass end_sql pks.present? ? pks[0] : pks end |
#recreate_database(name, **options) ⇒ Object
Drops the database specified on the name
attribute and creates it again using the provided options
.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 46 def recreate_database(name, **) #:nodoc: drop_database(name) create_database(name, ) end |
#remove_index!(table_name, index_name) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 348 def remove_index!(table_name, index_name) #:nodoc: end |
#rename_column(table_name, column_name, new_column_name) ⇒ Object
Renames a column in a table.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 340 def rename_column(table_name, column_name, new_column_name) #:nodoc: clear_cache! execute "ALTER TABLE #{quote_table_name(table_name)} RENAME COLUMN #{quote_column_name(column_name)} TO #{quote_column_name(new_column_name)}" end |
#rename_index(table_name, old_name, new_name) ⇒ Object
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 351 def rename_index(table_name, old_name, new_name) end |
#rename_table(table_name, new_name) ⇒ Object
Renames a table. Also renames a table's primary key sequence if the sequence name exists and matches the Active Record default.
Example:
rename_table('octopuses', 'octopi')
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 287 def rename_table(table_name, new_name) clear_cache! execute "ALTER TABLE #{quote_table_name(table_name)} RENAME TO #{quote_table_name(new_name)}" end |
#reset_pk_sequence!(table, pk = nil, sequence = nil) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 261 def reset_pk_sequence!(table, pk = nil, sequence = nil) #:nodoc: end |
#schema_exists?(name) ⇒ Boolean
Returns true if schema exists.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 159 def schema_exists?(name) select_value("SELECT COUNT(*) FROM pg_namespace WHERE nspname = '#{name}'", 'SCHEMA').to_i > 0 end |
#schema_names ⇒ Object
Returns an array of schema names.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 208 def schema_names select_value(<<-SQL, 'SCHEMA') SELECT nspname FROM pg_namespace WHERE nspname !~ '^pg_.*' AND nspname NOT IN ('information_schema') ORDER by nspname; SQL end |
#schema_search_path ⇒ Object
Returns the active schema search path.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 241 def schema_search_path @schema_search_path ||= select_value('SHOW search_path', 'SCHEMA') end |
#schema_search_path=(schema_csv) ⇒ Object
Sets the schema search path to a string of comma-separated schema names. Names beginning with $ have to be quoted (e.g. $user => '$user'). See: www.postgresql.org/docs/current/static/ddl-schemas.html
This should be not be called manually but set in database.yml.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 233 def schema_search_path=(schema_csv) if schema_csv execute("SET search_path TO #{schema_csv}", 'SCHEMA') @schema_search_path = schema_csv end end |
#serial_sequence(table, column) ⇒ Object
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 254 def serial_sequence(table, column) select_value("SELECT pg_get_serial_sequence('#{table}', '#{column}')", 'SCHEMA') end |
#set_pk_sequence!(table, value) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 258 def set_pk_sequence!(table, value) #:nodoc: end |
#table_exists?(name) ⇒ Boolean
Returns true if table exists. If the schema is not specified as part of name
then it will only find tables within the current schema search path (regardless of permissions to access tables in other schemas)
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 106 def table_exists?(name) ActiveSupport::Deprecation.warn(<<-MSG.squish) #table_exists? currently checks both tables and views. This behavior is deprecated and will be changed with Rails 5.1 to only check tables. Use #data_source_exists? instead. MSG data_source_exists?(name) end |
#tables(name = nil) ⇒ Object
Returns the list of all tables in the schema search path or a specified schema.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 83 def tables(name = nil) if name ActiveSupport::Deprecation.warn(<<-MSG.squish) Passing arguments to #tables is deprecated without replacement. MSG end select_values("SELECT tablename FROM pg_tables WHERE schemaname = ANY(current_schemas(false))", 'SCHEMA') end |
#type_to_sql(type, limit: nil, precision: nil, scale: nil) ⇒ Object
Maps logical Rails types to PostgreSQL-specific data types.
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 396 def type_to_sql(type, limit: nil, precision: nil, scale: nil, **) case type.to_s when 'integer' return 'integer' unless limit case limit when 1, 2; 'smallint' when nil, 3, 4; 'integer' when 5..8; 'bigint' else raise(ActiveRecordError, "No integer type has byte size #{limit}. Use a numeric with precision 0 instead.") end else super end end |
#view_exists?(view_name) ⇒ Boolean
:nodoc:
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 140 def view_exists?(view_name) # :nodoc: name = Utils.extract_schema_qualified_name(view_name.to_s) return false unless name.identifier select_values(<<-SQL, 'SCHEMA').any? SELECT c.relname FROM pg_class c LEFT JOIN pg_namespace n ON n.oid = c.relnamespace WHERE c.relkind IN ('v','m') -- (v)iew, (m)aterialized view AND c.relname = '#{name.identifier}' AND n.nspname = #{name.schema ? "'#{name.schema}'" : 'ANY (current_schemas(false))'} SQL end |
#views ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/redshift/schema_statements.rb', line 130 def views # :nodoc: select_values(<<-SQL, 'SCHEMA') SELECT c.relname FROM pg_class c LEFT JOIN pg_namespace n ON n.oid = c.relnamespace WHERE c.relkind IN ('v','m') -- (v)iew, (m)aterialized view AND n.nspname = ANY (current_schemas(false)) SQL end |