Module: Switchman::ActiveRecord::PostgreSQLAdapter
- Defined in:
- lib/switchman/active_record/postgresql_adapter.rb
Instance Method Summary collapse
- #add_index_options(_table_name, _column_name) ⇒ Object
- #columns ⇒ Object
-
#create_database(name, options = {}) ⇒ Object
copy/paste; use quote_local_table_name.
- #current_schemas ⇒ Object
-
#drop_database(name) ⇒ Object
copy/paste; use quote_local_table_name.
- #extract_schema_qualified_name(string) ⇒ Object
- #foreign_keys(table_name) ⇒ Object
- #index_name_exists?(table_name, index_name, _default = nil) ⇒ Boolean
- #indexes(table_name) ⇒ Object
- #quote_local_table_name(name) ⇒ Object
- #quote_table_name(name) ⇒ Object
- #rename_index(table_name, old_name, new_name) ⇒ Object
- #rename_table(table_name, new_name) ⇒ Object
- #tables(name = nil) ⇒ Object
- #view_exists?(name) ⇒ Boolean
- #with_local_table_name(enable = true) ⇒ Object
Instance Method Details
#add_index_options(_table_name, _column_name) ⇒ Object
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# File 'lib/switchman/active_record/postgresql_adapter.rb', line 197 def (_table_name, _column_name, **) index_name, index_type, index_columns, , algorithm, using = super algorithm = nil if DatabaseServer.creating_new_shard && algorithm == "CONCURRENTLY" [index_name, index_type, index_columns, , algorithm, using] end |
#columns ⇒ Object
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# File 'lib/switchman/active_record/postgresql_adapter.rb', line 225 def columns(*) with_local_table_name(false) { super } end |
#create_database(name, options = {}) ⇒ Object
copy/paste; use quote_local_table_name
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# File 'lib/switchman/active_record/postgresql_adapter.rb', line 7 def create_database(name, = {}) = { encoding: 'utf8' }.merge!(.symbolize_keys) option_string = .sum do |key, value| case key when :owner " OWNER = \"#{value}\"" when :template " TEMPLATE = \"#{value}\"" when :encoding " ENCODING = '#{value}'" when :collation " LC_COLLATE = '#{value}'" when :ctype " LC_CTYPE = '#{value}'" when :tablespace " TABLESPACE = \"#{value}\"" when :connection_limit " CONNECTION LIMIT = #{value}" else "" end end execute "CREATE DATABASE #{quote_local_table_name(name)}#{option_string}" end |
#current_schemas ⇒ Object
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# File 'lib/switchman/active_record/postgresql_adapter.rb', line 39 def current_schemas select_values("SELECT * FROM unnest(current_schemas(false))") end |
#drop_database(name) ⇒ Object
copy/paste; use quote_local_table_name
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# File 'lib/switchman/active_record/postgresql_adapter.rb', line 35 def drop_database(name) #:nodoc: execute "DROP DATABASE IF EXISTS #{quote_local_table_name(name)}" end |
#extract_schema_qualified_name(string) ⇒ Object
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# File 'lib/switchman/active_record/postgresql_adapter.rb', line 51 def extract_schema_qualified_name(string) name = ::ActiveRecord::ConnectionAdapters::PostgreSQL::Utils.extract_schema_qualified_name(string.to_s) if string && !name.schema name.instance_variable_set(:@schema, shard.name) end [name.schema, name.identifier] end |
#foreign_keys(table_name) ⇒ Object
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# File 'lib/switchman/active_record/postgresql_adapter.rb', line 159 def foreign_keys(table_name) # mostly copy-pasted from AR - only change is to the nspname condition for qualified names support fk_info = select_all <<-SQL.strip_heredoc SELECT t2.oid::regclass::text 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 = '#{shard.name}' 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']) # strip the schema name from to_table if it matches to_table = row['to_table'] to_table_qualified_name = ::ActiveRecord::ConnectionAdapters::PostgreSQL::Utils.extract_schema_qualified_name(to_table) if to_table_qualified_name.schema == shard.name to_table = to_table_qualified_name.identifier end ::ActiveRecord::ConnectionAdapters::ForeignKeyDefinition.new(table_name, to_table, ) end end |
#index_name_exists?(table_name, index_name, _default = nil) ⇒ Boolean
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# File 'lib/switchman/active_record/postgresql_adapter.rb', line 122 def index_name_exists?(table_name, index_name, _default = nil) exec_query(<<-SQL, 'SCHEMA').rows.first[0].to_i > 0 SELECT COUNT(*) FROM pg_class t INNER JOIN pg_index d ON t.oid = d.indrelid INNER JOIN pg_class i ON d.indexrelid = i.oid WHERE i.relkind = 'i' AND i.relname = '#{index_name}' AND t.relname = '#{table_name}' AND i.relnamespace IN (SELECT oid FROM pg_namespace WHERE nspname = '#{shard.name}' ) SQL end |
#indexes(table_name) ⇒ Object
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# File 'lib/switchman/active_record/postgresql_adapter.rb', line 76 def indexes(table_name) result = query(<<-SQL, 'SCHEMA') SELECT distinct i.relname, d.indisunique, d.indkey, pg_get_indexdef(d.indexrelid), t.oid FROM pg_class t INNER JOIN pg_index d ON t.oid = d.indrelid INNER JOIN pg_class i ON d.indexrelid = i.oid WHERE i.relkind = 'i' AND d.indisprimary = 'f' AND t.relname = '#{table_name}' AND i.relnamespace IN (SELECT oid FROM pg_namespace WHERE nspname = '#{shard.name}' ) ORDER BY i.relname SQL result.map do |row| index_name = row[0] unique = row[1] == true || row[1] == 't' indkey = row[2].split(" ") inddef = row[3] oid = row[4] columns = Hash[query(<<-SQL, "SCHEMA")] SELECT a.attnum, a.attname FROM pg_attribute a WHERE a.attrelid = #{oid} AND a.attnum IN (#{indkey.join(",")}) SQL column_names = columns.stringify_keys.values_at(*indkey).compact unless column_names.empty? # add info on sort order for columns (only desc order is explicitly specified, asc is the default) desc_order_columns = inddef.scan(/(\w+) DESC/).flatten orders = desc_order_columns.any? ? Hash[desc_order_columns.map {|order_column| [order_column, :desc]}] : {} where = inddef.scan(/WHERE (.+)$/).flatten[0] using = inddef.scan(/USING (.+?) /).flatten[0].to_sym if ::Rails.version >= "5.2" ::ActiveRecord::ConnectionAdapters::IndexDefinition.new(table_name, index_name, unique, column_names, orders: orders, where: where, using: using) else ::ActiveRecord::ConnectionAdapters::IndexDefinition.new(table_name, index_name, unique, column_names, [], orders, where, nil, using) end end end.compact end |
#quote_local_table_name(name) ⇒ Object
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# File 'lib/switchman/active_record/postgresql_adapter.rb', line 135 def quote_local_table_name(name) # postgres quotes tables and columns the same; just pass through # (differs from quote_table_name_with_shard below by no logic to # explicitly qualify the table) quote_column_name(name) end |
#quote_table_name(name) ⇒ Object
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# File 'lib/switchman/active_record/postgresql_adapter.rb', line 142 def quote_table_name(name) return quote_local_table_name(name) if @use_local_table_name name = ::ActiveRecord::ConnectionAdapters::PostgreSQL::Utils.extract_schema_qualified_name(name.to_s) if !name.schema name.instance_variable_set(:@schema, shard.name) end name.quoted end |
#rename_index(table_name, old_name, new_name) ⇒ Object
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# File 'lib/switchman/active_record/postgresql_adapter.rb', line 219 def rename_index(table_name, old_name, new_name) validate_index_length!(table_name, new_name) execute "ALTER INDEX #{quote_table_name(old_name)} RENAME TO #{quote_local_table_name(new_name)}" end |
#rename_table(table_name, new_name) ⇒ Object
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# File 'lib/switchman/active_record/postgresql_adapter.rb', line 203 def rename_table(table_name, new_name) clear_cache! execute "ALTER TABLE #{quote_table_name(table_name)} RENAME TO #{quote_local_table_name(new_name)}" pk, seq = pk_and_sequence_for(new_name) if pk idx = "#{table_name}_pkey" new_idx = "#{new_name}_pkey" execute "ALTER INDEX #{quote_table_name(idx)} RENAME TO #{quote_local_table_name(new_idx)}" if seq && seq.identifier == "#{table_name}_#{pk}_seq" new_seq = "#{new_name}_#{pk}_seq" execute "ALTER TABLE #{seq.quoted} RENAME TO #{quote_local_table_name(new_seq)}" end end rename_table_indexes(table_name, new_name) end |
#tables(name = nil) ⇒ Object
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# File 'lib/switchman/active_record/postgresql_adapter.rb', line 43 def tables(name = nil) query(<<-SQL, 'SCHEMA').map { |row| row[0] } SELECT tablename FROM pg_tables WHERE schemaname = '#{shard.name}' SQL end |
#view_exists?(name) ⇒ Boolean
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# File 'lib/switchman/active_record/postgresql_adapter.rb', line 59 def view_exists?(name) name = ::ActiveRecord::ConnectionAdapters::PostgreSQL::Utils.extract_schema_qualified_name(name.to_s) return false unless name.identifier if !name.schema name.instance_variable_set(:@schema, shard.name) end 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 = '#{shard.name}' SQL end |
#with_local_table_name(enable = true) ⇒ Object
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# File 'lib/switchman/active_record/postgresql_adapter.rb', line 151 def with_local_table_name(enable = true) old_value = @use_local_table_name @use_local_table_name = enable yield ensure @use_local_table_name = old_value end |